Advanced treatment equipment and method for printing and dyeing wastewater

Abstract

The invention particularly relates to printing and dyeing wastewater advanced treatment equipment and a method thereof. The equipment comprises a pretreatment unit, an electrolysis unit, a pH regulation unit, a post-treatment unit and a comprehensive monitoring unit, the pretreatment unit comprises a physical filtering device and an advanced oxidation pretreatment device and is used for removing suspended solids and macromolecular organic matters; the electrolysis unit is provided with a current control module and a salinity adjusting module and is used for degrading organic pollutants and disinfecting and sterilizing; the pH adjusting unit is provided with a pH sensor and a pH correction pump and is used for accurately controlling the pH value change in the treatment process; the post-treatment unit comprises an ultrafiltration membrane and activated carbon and is used for removing residual micromolecular organic matters and trace heavy metal ions; the comprehensive monitoring unit integrates a PLC controller, a data acquisition module and a communication interface, and is used for realizing automatic management and remote monitoring of the system.

Description

Technical Field

[0001] The invention belongs to the field of wastewater treatment, and in particular relates to a printing and dyeing wastewater deep treatment device and a method thereof. Background Art

[0002] The printing and dyeing industry is one of the industries with the largest water consumption and wastewater discharge. The wastewater generated during its production process contains a large amount of pollutants such as organic matter, dyes, additives, heavy metal ions, etc. that are difficult to biodegrade. This type of wastewater usually has the following characteristics:

[0003] High chroma: Due to the presence of various dyes, wastewater often appears dark in color, causing visual pollution to the aquatic environment.

[0004] Complex ingredients: In addition to dyes, it also contains a variety of chemical additives, such as surfactants, fixing agents, etc., which increases the difficulty of processing.

[0005] High COD / BOD values: High chemical oxygen demand (COD) and biochemical oxygen demand (BOD) indicate that the wastewater is rich in organic matter and requires effective removal methods.

[0006] High salt content: A large amount of salt substances are used in some printing and dyeing processes, which increases the conductivity of the wastewater and affects the subsequent treatment process.

[0007] Traditional methods for treating printing and dyeing wastewater mainly include physical methods (such as sedimentation and filtration), chemical methods (such as coagulation and oxidation-reduction) and biological methods (such as activated sludge method). However, these methods have limitations when used alone, such as low treatment efficiency, high operating costs, and secondary pollution risks. With the increasingly stringent environmental regulations and the increasing awareness of environmental protection in society, it is particularly important to develop an efficient, economical and environmentally friendly deep treatment technology for printing and dyeing wastewater.

[0008] At present, although a variety of printing and dyeing wastewater treatment technologies have been widely used, they still face some challenges:

[0009] Unstable treatment effect: Traditional treatment processes have limited adaptability to the complex and changeable composition of printing and dyeing wastewater, especially when faced with sudden changes in water quality, it is difficult to ensure stable treatment effects.

[0010] High energy and chemical consumption: In order to achieve higher purification standards, many treatment systems have to increase the amount of chemicals or increase electricity consumption, which not only increases operating costs but also brings new environmental pollution problems.

[0011] Low degree of automation: Some existing processing equipment lacks intelligent management functions and relies heavily on manual intervention in operation and maintenance, which is prone to misoperation or delayed response, thus affecting the overall processing efficiency.

[0012] Low resource recycling rate: Some treatment processes fail to fully consider the recycling of resources, such as recycling and reusing useful substances in wastewater, resulting in waste of resources.

[0013] In view of the above problems, the market urgently needs a new generation of printing and dyeing wastewater deep treatment equipment and method that can overcome the defects of the existing technology. Summary of the invention

[0014] The purpose of the present invention is to provide a printing and dyeing wastewater deep treatment equipment, and it is another purpose of the present invention to provide a printing and dyeing wastewater deep treatment method to solve the problems raised in the above background technology.

[0015] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0016] A printing and dyeing wastewater deep treatment equipment, comprising a pretreatment unit, an electrolysis unit, a pH adjustment unit, a post-treatment unit, and a comprehensive monitoring unit; the pretreatment unit comprises a physical filtration device and an advanced oxidation pretreatment device for removing suspended solids and macromolecular organic matter; the electrolysis unit is equipped with a current control module and a salinity adjustment module for degrading organic pollutants and disinfecting and sterilizing; the pH adjustment unit is equipped with a pH sensor and a pH correction pump for accurately controlling the pH value change during the treatment process; the post-treatment unit comprises an ultrafiltration membrane and activated carbon for removing residual small molecular organic matter and trace heavy metal ions; the comprehensive monitoring unit integrates a PLC controller, a data acquisition module and a communication interface for realizing automatic management and remote monitoring of the system.

[0017] Furthermore, the pretreatment unit includes a pretreatment tower, which includes a grille, a sand filter, and a micro-filter cotton arranged from top to bottom. A printing and dyeing wastewater inlet is provided at the upper part of the grille, a plurality of flexible high-pressure flushing spray heads are provided at the upper part of the sand filter, a pressure sensor is provided at the bottom of the sand filter, a conical filter bucket is provided at the lower part of the micro-filter cotton, a spiral outlet is provided at the cone mouth of the conical filter bucket, a spiral baffle is provided in the spiral outlet, and the filtrate enters the oxidation tank at the bottom along the spiral baffle. The oxidation tank includes an ozone pipe at the bottom, a plurality of microporous aeration heads are provided on the ozone pipe, a turbine mixer is also provided at the upper part of the ozone pipe in the oxidation tank, a catalyst addition pump, an exhaust gas collection port, and an ORP sensor are also provided at the upper part of the oxidation tank, and an ultraviolet lamp is also integrated in the oxidation tank.

[0018] The control valve and pressure sensor of the flexible high-pressure flushing spray head are electrically connected to the PLC controller respectively. When the pressure value monitored by the pressure sensor under the sand filter exceeds a preset threshold value, the flexible high-pressure flushing spray head is triggered by the PLC controller to flush the sand filter; the ORP sensor and the flow control valve of the ozone pipe are electrically connected to the PLC controller respectively. The PLC controller has a preset ORP range. When the ORP sensor detects that the ORP value deviates from the set range, the flow control valve of the ozone pipe is regulated by the PLC controller.

[0019] Furthermore, the electrolysis unit includes an electrolytic cell, the oxidation tank of the pretreatment tower is connected to the electrolytic cell through a pipeline, the pipeline connecting the pretreatment tower and the electrolytic cell is provided with a pump and a control valve, the upper part of the electrolytic cell is provided with an inlet for wastewater to be electrolyzed, the pipeline is connected to the inlet of wastewater to be electrolyzed of the electrolytic cell, the electrolytic cell includes an anode electrode and a cathode electrode, one side of the electrolytic cell is connected to a salinity correction pump, and is configured with a corresponding solenoid valve, and a plurality of COD sensors and salinity sensors are also provided in the electrolytic cell.

[0020] Further, the COD sensor is electrically connected to the PLC controller, and the PLC controller uses a built-in data processing module to analyze the received COD signal, and predicts the required current density adjustment range according to the water quality change trend, wherein the current density adjustment range required according to the water quality change trend is adaptively controlled using a long short-term memory network algorithm, and the specific steps include:

[0021] Collect and organize historical data, including COD concentration, temperature, and pH value, and normalize the data;

[0022] The data is divided into a training set and a test set. 70% of the data is used as the training set and 30% of the data is used as the test set. The time series sample is constructed. For each time point t, the data of the past n time points are used as input, and the optimal current intensity at time t is used as the label.

[0023] Use the training set to train the LSTM model, minimize the loss function through the back propagation algorithm, and adjust the hyperparameters;

[0024] Evaluate the performance of the model on the test set, calculate the error between the predicted value and the actual value, and adjust the model structure or parameters based on the evaluation results;

[0025] Deploy the trained LSTM model to the PLC controller, receive data from sensors in real time, and predict and output the optimal current intensity;

[0026] Achieve closed-loop control, that is, dynamically adjust the current output according to the prediction results, while continuously collecting new data for online learning and model updates;

[0027] The PLC controller dynamically adjusts the current output based on the real-time COD data received and the preset optimal current range. When the COD concentration is lower than the set threshold, the PLC will trigger the energy-saving mode and reduce the current intensity; otherwise, it will increase the current density.

[0028] Furthermore, the solenoid valves corresponding to the salinity sensor and the salinity correction pump are electrically connected to the PLC controller respectively. The PLC controller reads the data of the salinity sensor at regular time intervals. If it is found that the salinity is lower or higher than the ideal range, the PLC controller immediately starts the correction program and adds an appropriate amount of sodium chloride solution through the salinity correction pump to bring the salinity back to the set range.

[0029] Furthermore, the pH adjustment unit includes a pH correction pump installed on one side of the electrolytic cell, and the pH correction pump is configured with a corresponding solenoid valve. The electrolytic cell is also provided with a plurality of pH sensors and a plurality of first ultrasonic cleaners. The solenoid valves and pH sensors corresponding to the pH correction pump are electrically connected to the PLC controller respectively. The PLC controller calculates the added acid or alkali solution based on the data fed back by the pH sensor, and outputs control instructions to the pH correction pump.

[0030] Furthermore, the post-processing unit includes a post-processing tank, the bottom of the electrolytic cell is connected to the post-processing tank through a pipeline and a post-processing water pump, a vertical UF membrane and an activated carbon filter layer are arranged in the post-processing tank, a second ultrasonic cleaner is arranged at the front end of the UF membrane, and a water quality detection port and a drain port are arranged on one side of the post-processing tank corresponding to the activated carbon filter layer.

[0031] A method for deep treatment of printing and dyeing wastewater, comprising the steps of:

[0032] S1. Pretreatment stage: The printing and dyeing wastewater passes through the pretreatment tower, and is filtered through the grid, sand filter, and microfiltration cotton to remove suspended particles; the wastewater after multi-stage filtration enters the oxidation tank for oxidation reaction, and the ORP sensor is used to monitor the redox potential in real time and automatically adjust the ozone supply;

[0033] S2 electrolysis treatment stage: The pretreated wastewater is pumped into the electrolytic cell, current is applied between the anode and cathode, the online COD sensor monitors the water quality changes in real time, and the current output parameters are dynamically adjusted in combination with the long short-term memory network algorithm. The sodium chloride content in the wastewater is adjusted through the salinity correction pump to ensure suitable electrolysis conditions;

[0034] S3. pH adjustment stage: Use an online pH sensor to monitor the pH value changes in the wastewater in real time, and the pH correction pump accurately adds an appropriate amount of acid or alkali solution based on the feedback data to keep the pH value within the target range;

[0035] S4. Post-treatment stage: The wastewater is purified through UF membrane and activated carbon filter layer. The water quality detection port is equipped with an online water quality analyzer to monitor the effluent water quality indicators in real time to ensure that it meets the discharge or reuse standards.

[0036] Beneficial effects: This application provides an efficient, intelligent and environmentally friendly printing and dyeing wastewater deep treatment equipment and method, which can effectively remove various pollutants in printing and dyeing wastewater and purify water quality. Its main technical effects are as follows:

[0037] 1. Efficient multi-stage pretreatment

[0038] Removal of suspended solids and macromolecular organic matter: Through the multi-stage filtration system composed of grids, sand filters and micro-filter cotton, suspended particles of different particle sizes are effectively removed, providing stable water quality input for subsequent treatment.

[0039] Automatic backwash mechanism: Using high-precision pressure sensors to monitor the pressure difference in real time, the PLC controller automatically starts the backwash program according to the set threshold to prevent filter material clogging, ensure continuous and stable filtration effect, and reduce the need for manual maintenance.

[0040] 2. Enhanced advanced oxidation pretreatment

[0041] Ozone oxidation tower: uses countercurrent contact, turbulent contact and other methods to fully dissolve ozone gas in wastewater and enhance the oxidation reaction rate; combined with UV light and specific catalysts (such as titanium dioxide TiO2), it further increases the oxidation reaction rate and significantly reduces the concentration of organic pollutants.

[0042] Dynamically adjust the air intake: The ORP sensor monitors the redox potential in real time, automatically adjusts the ozone supply, and maintains the best oxidation conditions. At the same time, the exhaust gas collection port ensures the safety and environmental protection of the operating environment.

[0043] 3. Intelligent electrolysis treatment

[0044] Degrade organic pollutants and disinfect: Use modified graphene-based composite materials as anodes to enhance the efficiency of electrochemical reactions; combine long short-term memory network algorithm (LSTM) to implement adaptive current control strategy, dynamically respond to water quality fluctuations, and automatically optimize current output parameters to ensure the best treatment effect under different load conditions.

[0045] Salinity Control Module: Built-in salinity sensor accurately measures the sodium chloride content to ensure suitable electrolysis conditions and avoid the risk of by-product formation.

[0046] 4. Accurate pH adjustment

[0047] Online pH monitoring and correction: A highly sensitive online pH sensor is used to monitor the pH value changes in the wastewater in real time. The pH correction pump accurately adds an appropriate amount of acid or alkali solution based on the feedback data to keep the pH value within the target range (e.g. 6.0-8.5) to ensure the stability and effectiveness of the treatment process.

[0048] 5. Optimization of post-processing unit

[0049] Removal of residual pollutants: UF membrane and activated carbon filter layer effectively remove residual small molecular organic matter and trace heavy metal ions, ensuring that the final effluent quality meets the discharge or reuse standards; ultrasonic cleaner works regularly to prevent membrane surface contamination and clogging, extending the service life of the equipment.

[0050] Intelligent management system: The PLC controller centrally manages the post-processing unit, receives data from various sensors, automatically starts the cleaning or regeneration program, and issues regeneration or replacement prompts in advance to ensure the reliability and stability of the system.

[0051] 6. Comprehensive monitoring and remote management

[0052] Automated management and remote monitoring: As the core control unit, the PLC controller is responsible for receiving data from sensors in various locations and issuing control instructions to the actuators according to preset algorithms. It supports remote access and management, allowing managers to monitor the system operation status anytime and anywhere, receive alarm information and respond promptly.

[0053] Data security and compliance: SSL / TLS encryption technology is used during the communication process to ensure the security and integrity of data transmission; the system automatically records all operation logs, alarm events and processing actions to form a complete activity track, which is convenient for troubleshooting and responsibility tracing, ensuring compliance with regulatory requirements and improving the company's compliance management level.

[0054] In summary, the printing and dyeing wastewater deep treatment equipment and method provided by this application demonstrate excellent technical performance, can respond quickly under different water quality conditions, maintain a stable treatment effect, and take into account the requirements of energy conservation and environmental protection. This advanced treatment method not only enhances the intelligent management level of the system, but also improves the reliability and environmental performance of the entire printing and dyeing wastewater treatment equipment, greatly reduces operating costs and maintenance difficulties, and achieves a win-win situation of economic and environmental benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 It is a schematic diagram of system connection of the present invention.

[0056] In the figure, 100. pretreatment tower, 101. grid, 102. sand filter, 103. microfiltration cotton, 104. conical filter bucket, 105. printing and dyeing wastewater inlet, 106. flexible high-pressure flushing spray head, 107. pressure sensor, 108. spiral outlet, 109. ORP sensor, 110. catalyst addition pump, 111. exhaust gas collection port, 112. turbine mixer, 113. ozone pipe, 114. microporous aeration head;

[0057] 200. electrolytic cell, 201. anode electrode, 202. cathode electrode, 203. salinity correction pump, 204. COD sensor, 205. water pump, 206. control valve, 207. inlet of wastewater to be electrolyzed, 208. PH correction pump, 209. PH sensor, 210. first ultrasonic cleaner, 211. salinity sensor;

[0058] Post-treatment tank, 301. Post-treatment water pump, 302. UF membrane, 303. Activated carbon filter layer, 304. Second ultrasonic cleaner, 305. Water quality detection port, 306. Drainage port. DETAILED DESCRIPTION

[0059] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of 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.

[0060] A printing and dyeing wastewater deep treatment equipment, comprising a pretreatment unit, an electrolysis unit, a pH adjustment unit, a post-treatment unit, and a comprehensive monitoring unit; the pretreatment unit comprises a physical filtration device and an advanced oxidation pretreatment device for removing suspended solids and macromolecular organic matter; the electrolysis unit is equipped with a current control module and a salinity adjustment module for degrading organic pollutants and disinfecting and sterilizing; the pH adjustment unit is equipped with a pH sensor and a pH correction pump for accurately controlling the pH value change during the treatment process; the post-treatment unit comprises an ultrafiltration membrane and activated carbon for removing residual small molecular organic matter and trace heavy metal ions; the comprehensive monitoring unit integrates a PLC controller, a data acquisition module and a communication interface for realizing automatic management and remote monitoring of the system.

[0061] like Figure 1As shown, the pretreatment unit includes a pretreatment tower 100, and the pretreatment tower 100 includes a grid 101, a sand filter 102, and a micro-filter cotton 103 arranged from top to bottom. The upper part of the grid 101 is provided with a printing and dyeing wastewater inlet 105, the upper part of the sand filter 102 is provided with a plurality of flexible high-pressure flushing spray heads 106, the bottom of the sand filter 102 is provided with a pressure sensor 107, and the lower part of the micro-filter cotton 103 is provided with a conical filter bucket 104, and the cone mouth of the conical filter bucket 104 is provided with a screw A spiral outlet 108 is provided with a spiral baffle, and the filtrate enters the oxidation tank at the bottom along the spiral baffle. The oxidation tank includes an ozone pipe 113 at the bottom, and a plurality of microporous aeration heads 114 are provided on the ozone pipe 113. A turbine mixer 112 is also provided on the upper part of the ozone pipe 113 in the oxidation tank. A catalyst addition pump 110, an exhaust gas collection port 111, and an ORP sensor 109 are also provided on the upper part of the oxidation tank. An ultraviolet lamp is also integrated in the oxidation tank.

[0062] The main task of the pretreatment unit is to remove suspended solid matter and macromolecular organic pollutants in wastewater and provide stable water quality input for subsequent treatment. The configuration includes:

[0063] Multi-stage filtration system: including coarse filter grid 101, fine filter sand filter 102 and micro filter cotton 103. Each stage of filtration targets suspended particles of different particle sizes, and gradually purifies from large to small.

[0064] Swirl inlet: including a conical filter hopper 104, the conical mouth of the conical filter hopper 104 is provided with a spiral outlet 108, and a spiral baffle is provided in the spiral outlet 108. The spiral baffle can form a vortex when the filtrate enters the oxidation tank, and this vortex can distribute the liquid in the inlet area of ​​the oxidation tank in a more uniform manner. This helps to ensure that the ozone is fully in contact with the pollutants in the wastewater and improve the reaction efficiency. By generating a vortex, gas-liquid mixing can be initially achieved when the wastewater enters the oxidation tank (especially if the ozone gas provided by the ozone pipe 113 already exists), thereby starting the oxidation process in advance and increasing the treatment effect. The design of the conical filter hopper is combined with the spiral outlet, so that the pretreated wastewater can enter the oxidation tank in a relatively gentle manner, avoiding direct impact on the bottom structure or equipment, such as the microporous aeration head 114 on the ozone pipe, and extending the service life of the equipment. The conical structure is conducive to any large particles or sediments that have not been filtered out to be concentrated at the bottom of the filter hopper, which is convenient for subsequent cleaning or discharge system, and prevents these substances from entering the oxidation tank and affecting the treatment effect. The spiral baffle changes the water flow path and increases the path length of the water before entering the oxidation tank, which can provide extra time for some light suspended matter to further settle or adhere to the baffle, playing a certain auxiliary filtering role. This design is to better prepare the wastewater for the next stage of advanced oxidation treatment and ensure the effectiveness and stability of the treatment process.

[0065] Automatic backwashing mechanism: The automatic backwashing function is designed to be triggered by timing or pressure difference to prevent clogging of the filter material, ensure continuous and stable filtration effect, and reduce the need for manual maintenance. The high-precision pressure sensor 107 is installed at the bottom or outlet of the sand filter 102 to monitor the water pressure after filtration in real time. The sensor has high sensitivity and stability and can accurately detect small pressure changes. The data of the pressure sensor 107 is transmitted to the PLC controller through a dedicated signal cable. These cables are usually waterproof and anti-corrosion to ensure long-term stable operation. The PLC controller, as the control core of the entire system, receives data from the pressure sensor 107 and makes judgments based on preset thresholds. If the pressure difference is detected to exceed the set value, such as 0.5 bar, the PLC will immediately start the backwashing program. A reasonable pressure difference threshold is preset in the PLC, and this value can be adjusted according to the actual operating conditions and water quality characteristics to ensure the best backwashing effect and frequency. Sufficient water pressure is provided by a dedicated high-pressure water pump or accumulator to ensure that the flexible high-pressure flushing sprinkler 106 can generate a strong enough water flow to remove impurities attached to the filter material. The flexible high-pressure flushing spray head 106 starts working, spraying high-pressure water into the sand filter 102. The flexible design of the spray head allows it to flexibly adjust the spray angle and coverage to ensure all-round cleaning. In a specific implementation, even if the pressure difference threshold is not reached, the PLC can also regularly start backwashing according to a preset schedule to prevent potential blockage.

[0066] Advanced oxidation pretreatment: The ozone oxidation tower adopts efficient gas-water contact methods, including countercurrent contact and turbulent contact, so that the ozone gas is fully dissolved in the wastewater and the oxidation reaction rate is enhanced. Multi-layer fillers or special gas-liquid distributors are set in the tower body. The wastewater flows downward from the top of the tower, while the ozone gas is sprayed upward from the bottom of the tower to form a countercurrent contact mode. The countercurrent method increases the contact time and area of ​​the gas-liquid two phases and improves the ozone transfer efficiency. Install a special turbulence generating device such as a turbine mixer 112 to promote violent turbulence in the water flow and improve the degree of mixing. Use a microporous aeration head 114 to decompose the ozone gas into fine bubbles, increase the total surface area of ​​the bubbles, and promote the exchange of substances between gas and water.

[0067] Dynamic adjustment of air intake: equipped with an online monitoring instrument ORP sensor 109, which detects ozone concentration and redox potential in real time, automatically adjusts ozone supply, and maintains optimal oxidation conditions. ORP sensor 109 is installed on the upper part of the oxidation tank to monitor the redox potential ORP in the wastewater in real time. The sensor has high sensitivity and fast response characteristics, and can accurately reflect the dissolution and oxidation capacity of ozone. The data of the ORP sensor is transmitted to the PLC controller through a dedicated signal cable. These cables are usually waterproof and anti-corrosion to ensure long-term stable operation. The PLC controller, as the control core of the entire system, receives data from the ORP sensor 109 and makes judgments based on the preset optimal ORP range. If the ORP value is detected to deviate from the set range, the PLC will immediately start the adjustment program. According to the instructions issued by the PLC controller, the working parameters of the ozone generator such as frequency and power are automatically adjusted to change the amount of ozone generated to meet real-time needs. A precision flow control valve is installed at the entrance of the ozone pipe 113 to ensure that the ozone gas flow entering the oxidation tank is accurately controllable, and it has a leak-proof design to ensure safety. Use a microporous aeration head 114 or other advanced aeration equipment to decompose ozone gas into tiny bubbles, increase the total surface area of ​​the bubbles, and further promote the material exchange between gas and water.

[0068] Auxiliary catalytic means: Combined with UV light, an ultraviolet lamp is integrated in the tower, and ultraviolet light is used to excite ozone molecules and accelerate the generation of free radicals; a specific catalyst such as titanium dioxide TiO2 is added through the catalyst addition pump 110 to increase the oxidation reaction rate.

[0069] Waste gas treatment facilities: Add special waste gas collection and treatment equipment to ensure the safety and environmental protection of the operating environment.

[0070] The electrolysis unit includes an electrolytic cell 200. The oxidation tank of the pretreatment tower 100 is connected to the electrolytic cell 200 through a pipeline. The pipeline connecting the pretreatment tower 100 and the electrolytic cell 200 is provided with a pump 205 and a control valve 206. The upper part of the electrolytic cell 200 is provided with an inlet 207 for wastewater to be electrolyzed. The pipeline is connected to the inlet 207 of the wastewater to be electrolyzed of the electrolytic cell 200. The electrolytic cell 200 includes an anode electrode 201 and a cathode electrode 202. A salinity correction pump 203 is connected to one side of the electrolytic cell 200, and a corresponding solenoid valve is configured. A plurality of COD sensors 204 are also provided in the electrolytic cell 200.

[0071] The electrolysis unit is equipped with a current control module and a salinity adjustment module for degrading organic pollutants and disinfecting;

[0072] The electrolytic unit uses a modified graphene-based composite material with high conductivity and large specific surface area as the anode 201. This material can significantly improve the efficiency of the electrochemical reaction, and has good corrosion resistance and stability, which prolongs the service life of the electrode. The graphene surface is modified by introducing nano-scale metal oxides or precious metal particles such as iridium dioxide IrO2 and platinum Pt to enhance its catalytic activity and further promote the degradation of organic pollutants. The use of stainless steel as the cathode 202 is not only low-cost, but also has good mechanical strength and corrosion resistance, and is suitable for long-term operating environments. In order to prevent stainless steel from passivation or corrosion during long-term use, a protective coating, such as a titanium-based coating, is applied to the surface to improve its corrosion resistance and maintain efficient electronic conduction performance. The anode 201 and the cathode 202 are vertically installed on both sides of the electrolytic cell and fixed inside the electrolytic cell by a corrosion-resistant bracket. Sufficient space is left at the bottom for water to flow smoothly, ensuring uniform distribution of current and maximizing the reaction area.

[0073] The electrolysis unit is equipped with an adaptive current control module, and a high-precision online chemical oxygen demand (COD) sensor 204 is installed near the water inlet to monitor the quality of wastewater before entering the electrolytic cell in real time, and to continuously monitor the changes in the concentration of organic matter in the wastewater. The COD sensor 204 is electrically connected to the PLC controller, and the PLC controller uses the built-in data processing module to quickly analyze the received COD signal and predict the required current density adjustment range according to the trend of water quality changes.

[0074] The electrolysis unit is equipped with an adaptive control strategy based on the long short-term memory network algorithm, which can dynamically respond to water quality fluctuations and automatically optimize the current output parameters to ensure the best treatment effect under different load conditions. Specifically, the technical goal is that when the COD concentration of the influent is detected to be low, the system will automatically switch to energy-saving mode, reduce the current intensity, and reduce unnecessary energy consumption. When the COD increases, the current density will be increased rapidly to ensure treatment efficiency. The technical implementation includes:

[0075] Online COD sensor 204: Install high-precision online chemical oxygen demand (COD) sensors to monitor the quality of wastewater before entering the electrolyzer in real time. These sensors have high sensitivity and fast response characteristics to ensure data accuracy. The data from the COD sensor is transmitted to the PLC controller via a dedicated signal cable. These cables are usually waterproof and corrosion-resistant to ensure long-term stable operation.

[0076] Built-in data processing module: The PLC controller is integrated with a data processing module for rapid analysis of received COD signals. This module can predict the required current density adjustment range based on the water quality change trend and provide a decision basis for subsequent intelligent regulation.

[0077] Historical data analysis: Use the built-in storage module to save long-term historical data, use big data analysis technology to predict future water quality changes, adjust working parameters in advance, and avoid lag effects.

[0078] Adaptive control algorithm: Adaptive control strategy based on long short-term memory network algorithm, dynamically responds to water quality fluctuations, and automatically optimizes current output parameters. This algorithm can continuously optimize itself according to historical data to improve prediction accuracy and response speed. The model structure includes input layer, hidden layer, and output layer. Among them, the input features of the input layer include historical COD concentration values, COD concentration at the current time point, temperature, pH value, and factors that may affect the electrolysis process. For example, the input can be the COD concentration per hour in the past 24 hours, forming a time series of length 24. Hidden layer: Contains multiple LSTM units, each of which is responsible for processing one time step in the time series. The LSTM unit contains forget gates, input gates, and output gates. These gating mechanisms allow the network to selectively remember or forget information, thereby effectively handling long-term dependencies. Set up multiple layers of LSTM to increase the complexity and expressiveness of the model. The output layer predicts the optimal current intensity in the future. If the goal is to make immediate adjustments, the output can directly correspond to the optimal current value for the next time step; if the goal is to plan ahead, the current plan for the next few time steps can be output. The specific steps of adaptive control using the long short-term memory network algorithm include:

[0079] Collect and organize historical data, including COD concentration, temperature, and pH value, and normalize the data to ensure that all characteristic values ​​are within the same magnitude range to facilitate training.

[0080] The data is divided into a training set and a test set. 70% of the data is used as the training set and 30% of the data is used as the test set. Time series samples are constructed. For each time point t, the data of the past n time points are used as input, and the optimal current intensity at time t is used as the label.

[0081] The LSTM model is trained using the training set, the loss function is minimized through the back-propagation algorithm, and the hyperparameters are adjusted to improve the model performance.

[0082] Evaluate the performance of the model on the test set, calculate the error between the predicted value and the actual value, and further adjust the model structure or parameters based on the evaluation results.

[0083] Deploy the trained LSTM model to the PLC controller, receive data from sensors in real time, predict and output the optimal current intensity, and implement closed-loop control, that is, dynamically adjust the current output according to the prediction results, while continuously collecting new data for online learning and model updates.

[0084] The PLC controller dynamically adjusts the current output based on the received real-time COD data and the preset optimal current range. For example, when the COD concentration is lower than the set threshold, the PLC will trigger the energy-saving mode and reduce the current intensity; otherwise, it will increase the current density to ensure the treatment efficiency.

[0085] Through the above model, adaptive switching between energy-saving mode and high-efficiency processing mode can be achieved:

[0086] Energy saving mode: When the inlet COD concentration is detected to remain at a low level, the PLC controller automatically switches to energy saving mode. In this mode, the current intensity is reduced to the minimum level required to maintain basic functions, thereby significantly reducing energy consumption.

[0087] In high-efficiency treatment mode, once the COD concentration rises, especially when it exceeds the set threshold, the PLC immediately switches back to high-efficiency treatment mode, rapidly increasing the current density to ensure that organic pollutants are fully degraded. This process is seamless and fast to meet the challenges brought by water quality changes.

[0088] In practical applications, this adaptive current control strategy demonstrates its excellent performance:

[0089] Strong adaptability: Whether it is seasonal changes or water quality fluctuations caused by emergencies, the system can respond quickly and maintain a stable treatment effect.

[0090] Energy saving and emission reduction: By precisely controlling the current output, not only the processing efficiency is improved, but also the power consumption is greatly reduced, achieving a win-win situation of economic and environmental benefits.

[0091] Easy maintenance: The intelligent management system reduces the need for manual intervention, simplifies daily maintenance work, and reduces operating costs.

[0092] In summary, the adaptive control strategy developed based on the machine learning algorithm provides strong technical support for the electrolysis unit, ensuring the best treatment effect under different water quality conditions, while taking into account the requirements of energy conservation and environmental protection. This advanced control method not only enhances the intelligent management level of the system, but also improves the reliability and environmental performance of the entire printing and dyeing wastewater deep treatment equipment.

[0093] The electrolysis unit is also equipped with a precise salinity control module, including a built-in salinity sensor 211, a high-resolution sensor, which accurately measures the sodium chloride content; a salinity correction pump 203, which is used to add an appropriate amount of sodium chloride solution; and a safety protection module, including an excessive warning mechanism and an emergency treatment plan. Equipped with a high-resolution salinity sensor 211, it can accurately measure the sodium chloride content in the wastewater to ensure that it is maintained within the ideal range of 0.005mol / L to 0.05mol / L. Once the salinity deviates from the set range, the system will immediately start the correction procedure to restore the correct salinity level by adding an appropriate amount of sodium chloride solution, thereby avoiding the risk of by-product generation. Set the salinity upper limit alarm threshold. Once this limit is exceeded, the system will issue an alarm to remind the operator to take appropriate measures to prevent equipment damage or other safety hazards caused by excessive salinity. The salinity correction pump 203 is connected to the inside of the electrolytic cell through a corrosion-resistant pipe. A feedback loop is established between the salinity sensor 211 and the correction pump 203 to achieve automatic adjustment. Specifically, the setting steps are:

[0094] When the system starts, the PLC controller reads the current salinity value and checks whether it is within the preset ideal range of 0.005mol / L to 0.05mol / L.

[0095] The PLC controller reads the data of the salinity sensor 211 at regular time intervals, such as once every minute, to ensure that salinity changes are monitored in real time.

[0096] If the salinity is found to be lower or higher than the ideal range, the PLC controller immediately starts the correction procedure and adds an appropriate amount of sodium chloride solution through the salinity correction pump 203 to bring the salinity back to the set range.

[0097] If the salinity exceeds the set upper alarm threshold, such as 0.06 mol / L, the PLC controller triggers an alarm to notify the operator and executes pre-defined safety measures, such as suspending water inflow or activating emergency drainage.

[0098] The system records all salinity measurements and corrective actions, generating log files for subsequent analysis and auditing. At the same time, regular reports are generated and sent to management personnel to help them understand the system's operating status.

[0099] The pH adjustment unit is equipped with an online pH sensor 209 and a pH correction pump 208, which are used to detect and add an appropriate amount of acid or alkali solution, respectively, to ensure that the pH is maintained within the target range during the entire treatment process, reduce the amount of chemicals used, and accurately control the pH value changes during the treatment process. The high-sensitivity, fast-response online pH sensor 209 can monitor the pH value changes in the wastewater in real time to ensure the accuracy and timeliness of the data. The online pH sensor 209 is usually installed near the water inlet or near the outlet of the electrolysis unit to capture the pH change trend in time. The installation method uses an insertion or flow-through installation method to ensure that the sensor probe is completely immersed in the wastewater and the surrounding water flow is stable and undisturbed. The pH correction pump 208 is installed in an easily accessible position for daily inspection and maintenance, generally located inside or adjacent to the pH adjustment unit. It is directly connected to the wastewater flow channel through a corrosion-resistant pipe to ensure that the added chemicals can be quickly and evenly mixed into the wastewater. The sensor is equipped with an ultrasonic self-cleaning device to prevent dirt accumulation from affecting the measurement accuracy and reduce the maintenance frequency. The integrated intelligent control system automatically calculates and accurately adds the appropriate amount of acid or alkali solution based on the data fed back by the pH sensor 209 to maintain the target pH range, such as 6.0 to 8.5. The PLC controller receives the data from the pH sensor 209 and outputs control instructions to the pH correction pump 208 through a preset algorithm. The specific operation process is as follows:

[0100] When the system starts, the PLC controller reads the current pH value and checks whether it is within the preset target range, such as 6.0 to 8.5.

[0101] The PLC controller reads the data of the pH sensor 209 at regular time intervals, such as once every minute, to ensure that the pH changes are monitored in real time.

[0102] If the pH value is found to deviate from the target range, the PLC controller immediately starts the correction program and adds an appropriate amount of acid or alkali solution through the pH correction pump 208 to restore the pH value to the set range.

[0103] The operating parameters of the pH correction pump 208, such as flow rate and frequency, are dynamically adjusted by the PLC according to the PID control algorithm to ensure accurate addition.

[0104] Set pH upper and lower alarm thresholds such as 5.5 and 8.8. Once this limit is exceeded, the PLC triggers an alarm to notify the operator and executes pre-defined safety measures such as suspending water inflow or activating emergency drainage.

[0105] The system records all pH measurements and corrective actions, generates log files for subsequent analysis and auditing, and generates regular reports to managers to help them understand the system's operating status.

[0106] Post-processing unit

[0107] In order to ensure that the post-treatment unit of the printing and dyeing wastewater deep treatment equipment can effectively remove residual small molecular organic matter and trace heavy metal ions, while ensuring the system's automated management and remote monitoring capabilities, the following are specific implementation details:

[0108] The post-processing unit includes a post-processing tank 300. The bottom of the electrolytic cell 200 is connected to the post-processing tank 300 through a pipeline and a post-processing pump 301. A vertical UF membrane 302 and an activated carbon filter layer 303 are arranged in the post-processing tank 300. A second ultrasonic cleaner 304 is arranged at the front end of the UF membrane 302 to prevent the membrane surface from being polluted and blocked. The ultrasonic cleaner works regularly, using high-frequency vibration to destroy pollutants attached to the membrane surface and maintain good permeability. A water quality detection port 305 and a drain port 306 are arranged on one side of the post-processing tank 300 corresponding to the activated carbon filter layer 303. The water quality detection port 305 is equipped with an online water quality analyzer, such as a conductivity meter and a turbidity meter, to monitor the water quality indicators of the effluent in real time to ensure that it meets the standards for discharge or reuse. The drain port 306 is located at the bottom of the post-processing tank and is controlled by a valve to ensure that only fully treated and qualified water can be discharged from the system. If the water quality does not meet the standards, the circulation treatment program is started until the discharge standards are met. The post-processing unit is centrally managed by the PLC controller, which receives data from various sensors, including the UF membrane pressure difference, the pressure difference before and after the activated carbon layer, and various parameters of the water quality detection port. When the UF membrane pressure difference exceeds the set threshold, the PLC controller automatically starts the ultrasonic cleaner 304, and checks whether the pressure difference returns to normal after the cleaning is completed. According to the pressure difference change trend before and after the activated carbon filter layer, the PLC predicts the saturation degree of the activated carbon and issues a regeneration or replacement prompt in advance. Once the data from the water quality detection port exceeds the preset range, the PLC immediately triggers an alarm to notify the operator and take corresponding emergency measures, such as suspending drainage or adding processing steps. The specific operation process is as follows:

[0109] When the system is started, the PLC controller reads the current pressure difference between the UF membrane 302 and the activated carbon filter layer 303, as well as various parameters of the water quality detection port 305 to confirm whether they are in a normal state.

[0110] The PLC reads the data of each sensor at regular intervals, such as once every minute, to grasp the working status of the post-processing unit in real time.

[0111] If it is found that the pressure difference of the UF membrane 302 is too high or the pressure difference before and after the activated carbon filter layer 303 increases abnormally, the PLC immediately starts the corresponding cleaning or regeneration procedure.

[0112] If the data at the water quality detection port 305 shows that the water exceeds the standard, the PLC will automatically adjust the treatment strategy, such as increasing the treatment time or intensity, to ensure the quality of the water output.

[0113] Set the upper and lower alarm thresholds for water quality. Once the limit is exceeded, the PLC triggers an alarm to notify the operator and executes pre-defined safety measures, such as suspending drainage or activating emergency handling procedures.

[0114] The system records all water quality measurements and treatment actions, generates log files for subsequent analysis and auditing, and generates regular reports to managers to help them understand the system's operating status.

[0115] Through the above mechanism, the post-treatment unit can effectively remove residual small molecular organic matter and trace heavy metal ions in printing and dyeing wastewater, ensuring the quality of the final effluent. This intelligent management system not only enhances the reliability and stability of the system, but also improves the environmental performance and economic benefits of the entire printing and dyeing wastewater deep treatment equipment. This post-treatment system demonstrates its excellent performance, can respond quickly under different water quality conditions, maintain a stable treatment effect, prevent the risk of excessive addition of chemicals, and ensure the safe operation of the equipment.

[0116] The integrated monitoring unit can efficiently realize the automated management and remote monitoring of the system, including:

[0117] PLC controller: As the core control unit of the entire system, it is responsible for receiving data from various sensors and issuing control instructions to actuators such as pumps and valves according to preset algorithms. PLC has powerful data processing capabilities and real-time response characteristics to ensure the stable operation of the system. PLC integrates multiple functional modules, including but not limited to:

[0118] Data acquisition module: used to collect data from various sensors.

[0119] Data processing module: Analyze and process the collected data to provide a basis for decision-making.

[0120] Control output module: Generates control signals based on the analysis results and drives the corresponding actuators.

[0121] Storage module: saves long-term historical data and supports subsequent big data analysis and prediction.

[0122] The data acquisition module is connected to sensors at all key locations, such as pH sensor 209, COD sensor 204, salinity sensor 211, pressure sensor 107, ORP sensor 109, etc. The accuracy and stability of data transmission are ensured through high-precision analog or digital input interfaces. The time stamp technology is used to ensure that data from different sources can be accurately synchronized, which is convenient for subsequent data integration and analysis.

[0123] The communication interface is configured with an Ethernet port or other high-speed network interface, supporting TCP / IP protocol, allowing the system to access the enterprise intranet or the Internet for easy remote access and management. Wireless communication options can be equipped with Wi-Fi, 4G / 5G modules to ensure communication continuity without wired network conditions, especially suitable for mobile monitoring or temporary deployment scenarios. Standard protocol support, supporting Modbus RTU / TCP, Profibus, Profinet and other industrial standard communication protocols, easy to integrate with other third-party systems. SSL / TLS encryption technology is used during the communication process to ensure the security and integrity of data transmission and prevent unauthorized access.

[0124] The local operation panel is equipped with a touch screen human-machine interface (HMI) and is located in an easily accessible position for on-site operators to view real-time data, adjust parameters, and manually intervene. It is configured with a web-based application or mobile application, allowing managers to monitor the operating status of the system anytime and anywhere through a computer or smartphone, receive alarm information, and respond promptly. Configure an intuitive graphical interface to display key performance indicators (KPIs), trend charts, historical records, etc., to help users quickly understand the health of the system. Set up multiple alarm mechanisms, such as SMS, email, App push, etc., to immediately notify relevant personnel when an abnormal situation is detected.

[0125] PLC automatically adjusts the working parameters of each processing unit according to the data fed back by the sensor, such as starting the backwash program, regulating the ozone supply, adjusting the current intensity, correcting the pH value, etc., to ensure the optimal treatment effect. Using machine learning algorithms such as LSTM to predict the trend of water quality changes, intelligently switch to energy-saving mode or high-efficiency treatment mode, it not only ensures the treatment efficiency but also saves energy consumption. Based on historical data analysis, it warns of potential problems in advance, such as recommending the replacement of UF membranes or activated carbon filter layers to reduce unplanned downtime. Develop detailed emergency plans for possible emergencies, and execute them immediately once triggered to ensure safe and reliable operation of the system.

[0126] The system automatically records all operation logs, alarm events and processing actions to form a complete activity track, which is convenient for troubleshooting and responsibility tracing. Detailed operation reports are automatically generated according to the set cycle, covering the change trend of major indicators, processing efficiency evaluation and other contents, to assist management in making scientific decisions. : Supports auditing of all changes within a specific time period to ensure compliance with regulatory requirements and improve the company's compliance management level.

[0127] Through the above mechanism, the integrated monitoring unit not only realizes the comprehensive automated management of the printing and dyeing wastewater deep treatment equipment, but also provides a convenient and efficient remote monitoring method. This intelligent management system enhances the reliability and stability of the system, while greatly improving the environmental protection performance and economic benefits. It demonstrates excellent adaptability and flexibility, can respond quickly under different conditions, maintain stable treatment effects, and effectively reduce operating costs and maintenance difficulties.

[0128] The present application also provides a method for deep treatment of printing and dyeing wastewater, comprising the steps of:

[0129] S1. Pretreatment stage: The wastewater passes through the pretreatment tower 100, and passes through the multi-stage filtration system of the grid 101, the sand filter 102, and the micro-filter cotton 103 to remove suspended particles of different particle sizes. The pressure sensor 107 at the bottom of the sand filter 102 monitors the pressure difference in real time. When it exceeds the set threshold (such as 0.5 bar), the PLC controller starts the backwashing program to ensure that the filtration effect is continuous and stable. The wastewater after multi-stage filtration enters the oxidation tank, and the ozone is decomposed into fine bubbles through the microporous aeration head 114, which is in full contact with the wastewater to enhance the oxidation reaction rate. The ORP sensor 109 is used to monitor the redox potential in real time, and the ozone supply is automatically adjusted to maintain the optimal oxidation conditions. Combined with UV light and the catalyst addition pump 110, a specific catalyst is added to further increase the oxidation reaction rate. The waste gas is specially treated through the waste gas collection port 111 to ensure the safety and environmental protection of the operating environment.

[0130] S2. Electrolysis treatment stage: The pretreated wastewater is sent to the electrolytic cell 200 by the pump 205, and a current is applied between the anode 201 and the cathode 202. The modified graphene-based composite material is used as the anode to enhance the efficiency of the electrochemical reaction. The online COD sensor 204 monitors the changes in water quality in real time, and dynamically adjusts the current output parameters in combination with the long short-term memory network algorithm to ensure the best treatment effect under different load conditions. According to actual needs, the sodium chloride content in the wastewater is adjusted by the salinity correction pump 203 to ensure suitable electrolysis conditions.

[0131] S3. pH adjustment stage: Use the online pH sensor 209 to monitor the pH value changes in the wastewater in real time, and the pH correction pump 208 accurately adds an appropriate amount of acid or alkali solution based on the feedback data to keep the pH value within the target range (e.g. 6.0 to 8.5).

[0132] S4. Post-treatment stage: The wastewater passes through the UF membrane 302 and the activated carbon filter layer 303 to further purify the water quality. The ultrasonic cleaner 304 works regularly to prevent the membrane surface from being contaminated and blocked. The water quality detection port 305 is equipped with an online water quality analyzer to monitor the effluent water quality indicators in real time to ensure that it meets the standards for discharge or reuse.

[0133] This application provides an efficient, intelligent and environmentally friendly printing and dyeing wastewater deep treatment equipment and method, which can effectively remove various pollutants in printing and dyeing wastewater and purify water quality. Its main technical effects are as follows:

[0134] 1. Efficient multi-stage pretreatment

[0135] Removal of suspended solids and macromolecular organic matter: Through the multi-stage filtration system composed of grids, sand filters and micro-filter cotton, suspended particles of different particle sizes are effectively removed, providing stable water quality input for subsequent treatment.

[0136] Automatic backwash mechanism: Using high-precision pressure sensors to monitor the pressure difference in real time, the PLC controller automatically starts the backwash program according to the set threshold to prevent filter material clogging, ensure continuous and stable filtration effect, and reduce the need for manual maintenance.

[0137] 2. Enhanced advanced oxidation pretreatment

[0138] Ozone oxidation tower: uses countercurrent contact, turbulent contact and other methods to fully dissolve ozone gas in wastewater and enhance the oxidation reaction rate; combined with UV light and specific catalysts (such as titanium dioxide TiO2), it further increases the oxidation reaction rate and significantly reduces the concentration of organic pollutants.

[0139] Dynamically adjust the air intake: The ORP sensor monitors the redox potential in real time, automatically adjusts the ozone supply, and maintains the best oxidation conditions. At the same time, the exhaust gas collection port ensures the safety and environmental protection of the operating environment.

[0140] 3. Intelligent electrolysis treatment

[0141] Degrade organic pollutants and disinfect: Use modified graphene-based composite materials as anodes to enhance the efficiency of electrochemical reactions; combine long short-term memory network algorithm (LSTM) to implement adaptive current control strategy, dynamically respond to water quality fluctuations, and automatically optimize current output parameters to ensure the best treatment effect under different load conditions.

[0142] Salinity control module: The built-in salinity sensor accurately measures the sodium chloride content to ensure suitable electrolysis conditions and avoid the risk of by-product formation; a safety protection module is set up, including an excessive warning mechanism and emergency response plan to ensure safe operation of the equipment.

[0143] 4. Accurate pH adjustment

[0144] Online pH monitoring and correction: A highly sensitive online pH sensor is used to monitor the pH value changes in the wastewater in real time. The pH correction pump accurately adds an appropriate amount of acid or alkali solution based on the feedback data to keep the pH value within the target range (e.g. 6.0-8.5) to ensure the stability and effectiveness of the treatment process.

[0145] 5. Optimization of post-processing unit

[0146] Removal of residual pollutants: UF membrane and activated carbon filter layer effectively remove residual small molecular organic matter and trace heavy metal ions, ensuring that the final effluent quality meets the discharge or reuse standards; ultrasonic cleaner works regularly to prevent membrane surface contamination and clogging, extending the service life of the equipment.

[0147] Intelligent management system: The PLC controller centrally manages the post-processing unit, receives data from various sensors, automatically starts the cleaning or regeneration program, and issues regeneration or replacement prompts in advance to ensure the reliability and stability of the system.

[0148] 6. Comprehensive monitoring and remote management

[0149] Automated management and remote monitoring: As the core control unit, the PLC controller is responsible for receiving data from sensors in various locations and issuing control instructions to the actuators according to preset algorithms. It supports remote access and management, allowing managers to monitor the system operation status anytime and anywhere, receive alarm information and respond promptly.

[0150] Data security and compliance: SSL / TLS encryption technology is used during the communication process to ensure the security and integrity of data transmission; the system automatically records all operation logs, alarm events and processing actions to form a complete activity track, which is convenient for troubleshooting and responsibility tracing, ensuring compliance with regulatory requirements and improving the company's compliance management level.

[0151] In summary, the printing and dyeing wastewater deep treatment equipment and method provided by this application demonstrate excellent technical performance, can respond quickly under different water quality conditions, maintain a stable treatment effect, and take into account the requirements of energy conservation and environmental protection. This advanced treatment method not only enhances the intelligent management level of the system, but also improves the reliability and environmental performance of the entire printing and dyeing wastewater treatment equipment, greatly reduces operating costs and maintenance difficulties, and achieves a win-win situation of economic and environmental benefits.

Claims

1. A printing and dyeing wastewater deep treatment equipment, characterized in that: It includes a pretreatment unit, an electrolysis unit, a pH adjustment unit, a post-treatment unit, and an integrated monitoring unit; the pretreatment unit includes a physical filtration device and an advanced oxidation pretreatment device for removing suspended solids and macromolecular organic matter; the electrolysis unit is equipped with a current control module and a salinity adjustment module for degrading organic pollutants and disinfecting and sterilizing; the pH adjustment unit is equipped with a pH sensor and a pH correction pump for accurately controlling the pH value change during the treatment process; the post-treatment unit includes an ultrafiltration membrane and activated carbon for removing residual small molecular organic matter and trace heavy metal ions; the integrated monitoring unit integrates a PLC controller, a data acquisition module and a communication interface for realizing automatic management and remote monitoring of the system.

2. According to claim 1, a printing and dyeing wastewater deep treatment equipment is characterized in that: The pretreatment unit comprises a pretreatment tower (100), wherein the pretreatment tower (100) comprises a grid (101), a sand filter (102), and a micro-filter mesh (103) arranged from top to bottom, wherein the upper part of the grid (101) is provided with a printing and dyeing wastewater inlet (105), the upper part of the sand filter (102) is provided with a plurality of flexible high-pressure flushing spray heads (106), the bottom of the sand filter (102) is provided with a pressure sensor (107), the lower part of the micro-filter mesh (103) is provided with a conical filter bucket (104), and the conical mouth of the conical filter bucket (104) is provided with a pressure sensor (107). There is a spiral outlet (108), and a spiral baffle is arranged inside the spiral outlet (108). The filtrate enters the oxidation tank at the bottom along the spiral baffle. The oxidation tank includes an ozone pipe (113) at the bottom, and a plurality of microporous aeration heads (114) are arranged on the ozone pipe (113). A turbine mixer (112) is also arranged on the upper part of the ozone pipe (113) in the oxidation tank. A catalyst addition pump (110), an exhaust gas collection port (111), and an ORP sensor (109) are also arranged on the upper part of the oxidation tank. An ultraviolet lamp is also integrated in the oxidation tank.

3. The printing and dyeing wastewater deep treatment equipment according to claim 2 is characterized in that: The control valve and the pressure sensor (107) of the flexible high-pressure flushing spray head (106) are respectively electrically connected to the PLC controller. When the pressure value monitored by the pressure sensor (107) under the sand filter (102) exceeds a preset threshold value, the flexible high-pressure flushing spray head (106) is triggered by the PLC controller to flush the sand filter (102). The ORP sensor (109) and the flow control valve of the ozone pipe (113) are respectively electrically connected to the PLC controller. The PLC controller is preset with an ORP range. When the ORP sensor (109) detects that the ORP value deviates from the set range, the flow control valve of the ozone pipe (113) is regulated by the PLC controller.

4. The printing and dyeing wastewater deep treatment equipment according to claim 2 is characterized in that: The electrolysis unit comprises an electrolytic cell (200), the oxidation cell of the pretreatment tower (100) is connected to the electrolytic cell (200) via a pipeline, a water pump (205) and a control valve (206) are provided on the pipeline connecting the pretreatment tower (100) and the electrolytic cell (200), a wastewater inlet (207) to be electrolyzed is provided at the upper part of the electrolytic cell (200), the pipeline is connected to the wastewater inlet (207) to be electrolyzed of the electrolytic cell (200), the electrolytic cell (200) comprises an anode electrode (201) and a cathode electrode (202) arranged, a salinity correction pump (203) is connected to one side of the electrolytic cell (200), and a corresponding electromagnetic valve is configured, and a plurality of COD sensors (204) and salinity sensors (211) are also provided in the electrolytic cell (200).

5. The printing and dyeing wastewater deep treatment equipment according to claim 4 is characterized in that: The COD (204) sensor is electrically connected to the PLC controller. The PLC controller uses a built-in data processing module to analyze the received COD signal and predict the required current density adjustment range according to the water quality change trend. The current density adjustment range required according to the water quality change trend is adaptively controlled using a long short-term memory network algorithm. The specific steps include: Collect and organize historical data, including COD concentration, temperature, and pH value, and normalize the data; The data is divided into a training set and a test set. 70% of the data is used as the training set and 30% of the data is used as the test set. The time series sample is constructed. For each time point t, the data of the past n time points are used as input, and the optimal current intensity at time t is used as the label. Use the training set to train the LSTM model, minimize the loss function through the back propagation algorithm, and adjust the hyperparameters; Evaluate the performance of the model on the test set, calculate the error between the predicted value and the actual value, and adjust the model structure or parameters based on the evaluation results; Deploy the trained LSTM model to the PLC controller, receive data from sensors in real time, and predict and output the optimal current intensity; Achieve closed-loop control, that is, dynamically adjust the current output according to the prediction results, while continuously collecting new data for online learning and model updates; The PLC controller dynamically adjusts the current output based on the real-time COD data received and the preset optimal current range. When the COD concentration is lower than the set threshold, the PLC will trigger the energy-saving mode and reduce the current intensity; otherwise, it will increase the current density.

6. The printing and dyeing wastewater deep treatment equipment according to claim 4 is characterized in that: The solenoid valves corresponding to the salinity sensor (211) and the salinity correction pump (203) are electrically connected to the PLC controller respectively. The PLC controller reads the data of the salinity sensor (211) at regular time intervals. If it is found that the salinity is lower or higher than the ideal range, the PLC controller immediately starts the correction program and adds an appropriate amount of sodium chloride solution through the salinity correction pump (203) to return the salinity to the set range.

7. The printing and dyeing wastewater deep treatment equipment according to claim 3 is characterized in that: The pH adjustment unit comprises a pH correction pump (208) installed on one side of the electrolytic cell (200), and the pH correction pump (208) is configured with a corresponding electromagnetic valve. The electrolytic cell (200) is also provided with a plurality of pH sensors (209) and a plurality of first ultrasonic cleaners (210). The electromagnetic valves and the pH sensors (209) corresponding to the pH correction pump (208) are respectively electrically connected to a PLC controller. The PLC controller calculates the acid or alkali solution to be added according to the data fed back by the pH sensor (209), and outputs a control instruction to the pH correction pump (208).

8. The printing and dyeing wastewater deep treatment equipment according to claim 3 is characterized in that: The post-treatment unit comprises a post-treatment tank (300), the bottom of the electrolytic cell (200) is connected to the post-treatment tank (300) via a pipeline and a post-treatment water pump (301), a vertical UF membrane (302) and an activated carbon filter layer (303) are arranged in the post-treatment tank (300), a second ultrasonic cleaner (304) is arranged at the front end of the UF membrane (302), and a water quality detection port (305) and a drainage port (306) are arranged on one side of the post-treatment tank (300) corresponding to the activated carbon filter layer (303).

9. A method for deep treatment of printing and dyeing wastewater according to any one of claims 1 to 8, characterized in that: Includes steps: S1. Pretreatment stage: The printing and dyeing wastewater passes through the pretreatment tower (100), and is filtered through the grid (101), the sand filter (102), and the microfiltration mesh cotton (103) to remove suspended particles; After multi-stage filtration, the wastewater enters the oxidation tank for oxidation reaction, and an ORP sensor (109) is used to monitor the redox potential in real time and automatically adjust the ozone supply; S2. Electrolysis treatment stage: The pretreated wastewater is sent to the electrolytic cell (200) by the pump (205), and current is applied between the anode (201) and the cathode (202). The online COD sensor (204) monitors the water quality changes in real time, and the current output parameters are dynamically adjusted in combination with the long short-term memory network algorithm. The sodium chloride content in the wastewater is adjusted by the salinity correction pump (203) to ensure suitable electrolysis conditions; S3. pH adjustment stage: Use an online pH sensor (209) to monitor the pH value changes in the wastewater in real time, and the pH correction pump (208) accurately adds an appropriate amount of acid or alkali solution according to the feedback data to keep the pH value within the target range; S4. Post-treatment stage: The wastewater is purified by UF membrane (302) and activated carbon filter layer (303). The water quality detection port (305) is equipped with an online water quality analyzer to monitor the effluent water quality indicators in real time to ensure that the wastewater meets the discharge standard or is reused.

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