A wastewater recycling treatment process and system

Abstract

The application relates to the technical field of water pollution treatment, in particular to a wastewater recycling treatment process and system, wherein the method comprises a primary oxidation step, a premixing and secondary oxidation step, an aeration and neutralization step, a complex reaction step and a secondary neutralization and flocculation step; wherein the system comprises a primary oxidation module, a premixing and secondary oxidation module, an aeration and neutralization module, a complex reaction module and a secondary neutralization and flocculation module. The application has the effect of improving the utilization rate of an oxidant.

Description

Technical Field

[0001] This application relates to the technical field of water pollution treatment, and in particular to a wastewater recycling treatment process and system. Background Technology

[0002] Currently, with rapid industrial development, the types and concentrations of organic pollutants in wastewater are becoming increasingly complex, especially recalcitrant organic compounds (such as dyes, pesticides, and drug residues), which pose a severe challenge to traditional treatment methods. Advanced oxidation processes (AOPs) have become a research hotspot due to their high degradation efficiency, among which the Fenton reaction utilizes Fe... 2+ Catalytic H₂O₂ generation of highly oxidizing hydroxyl radicals (·OH) can non-selectively decompose organic matter. However, improving reaction efficiency, reducing reagent waste, and inhibiting byproduct formation remain key issues restricting the large-scale application of this technology.

[0003] Existing technologies, such as Fenton's wastewater treatment method, include steps such as acidification, premixing, secondary oxidation, neutralization, and flocculation. The specific process involves adding a ferrous salt solution and H₂O₂ through mechanical stirring, utilizing a magnetic field to assist the reaction, and finally precipitating and separating the purified water. This technology, through multi-step, staged treatment, improves the COD removal rate to a certain extent.

[0004] However, mechanical stirring is insufficient to achieve uniform dispersion of ferrous salt solutions, resulting in localized Fe... 2+ Excessive concentration can trigger Fe 3+ Premature precipitation reduces catalytic activity, while insufficient H2O2 spray coverage leads to low oxidant utilization. Summary of the Invention

[0005] To improve the utilization rate of oxidants, this application provides a wastewater recycling treatment process and system.

[0006] Firstly, this application provides a wastewater recycling and reuse treatment process, which adopts the following technical solution:

[0007] A wastewater recycling process includes the following steps:

[0008] Primary oxidation: Add acid solution by rotating counterclockwise and simultaneously start clockwise stirring to adjust the pH of the wastewater to acidic. Then, introduce ozone and react for 15-30 minutes to generate primary oxidation wastewater.

[0009] Premixing and secondary oxidation: including the first addition step, the second addition step, the secondary oxidation step, and the detection step;

[0010] First additive: Ferrous salt solution is added to the primary oxidation wastewater by counter-stirring, and the droplet size is controlled to be 1~3mm;

[0011] Second additive: Hydrogen peroxide solution is atomized and sprayed according to the set delay time;

[0012] Secondary oxidation: Simultaneously apply an alternating magnetic field and react for 30-45 minutes to obtain secondary oxidized wastewater;

[0013] Detection: Monitor the pH value of the reaction solution in real time. If the pH > 3.5, the acid replenishment mechanism will be triggered.

[0014] Aeration and neutralization: Ozone aeration is performed on the secondary oxidation wastewater, and carbonate is added to adjust the pH to 5-6 to generate pre-neutralized wastewater;

[0015] Complexation reaction: Simultaneously atomize and spray the complexing defluoridating agent into the pre-neutralized wastewater and add magnetic powder by rotation. Stir and react for 10-20 minutes to obtain complexing reaction wastewater.

[0016] Secondary neutralization and flocculation: Add alkaline solution to the complexation reaction wastewater to adjust the pH to 6-7, add coagulant aid, stir in laminar flow for 10-15 minutes, and let stand to separate the supernatant.

[0017] Traditional processes use unidirectional stirring and direct addition of acid, resulting in low mixing efficiency, requiring 10-15 minutes for pH adjustment, and ozone utilization of less than 60%.

[0018] By adopting the above technical solution, reverse rotation acid addition + clockwise stirring creates a shear flow field, shortening the pH adjustment time to 5-8 minutes and increasing ozone utilization to 85%; droplet size control (1-3mm): improves the uniformity of ferrous salt solution dispersion and avoids localized Fe... 2+ If the concentration is too high, reduce Fe. 3+ The risk of precipitation is reduced, and the Fe content is decreased by delaying the addition of hydrogen peroxide. 2+ Premature reaction enhances the reaction effect, and spraying reduces oxidant waste while increasing the coverage area of ​​hydrogen peroxide. Furthermore, reverse stirring and the addition of ferrous salt solution ensure uniform dispersion of Fe²⁺, reducing premature precipitation caused by excessive concentration, thereby minimizing oxidant waste, improving oxidant utilization, and enhancing oxidation efficiency.

[0019] Optionally, the premixing and secondary oxidation steps may further include a proportion monitoring step;

[0020] Proportional monitoring: monitoring Fe 2+ / Fe 3+ The ratio, if Fe 3+ If the proportion is greater than 20%, the hydrogen peroxide spray pressure will be reduced and the magnetic field frequency will be increased to the upper limit.

[0021] By adopting the above technical solution, Fe can be monitored in real time. 2+ / Fe 3+The ratio of H2O2 spray pressure and magnetic field frequency is dynamically adjusted to stabilize catalytic activity and Fe. 3+ With the proportion controlled below 15%, the utilization rate of H2O2 increased from 60% to 85%; Magnetic field dynamic response: when the magnetic field frequency is increased to 50Hz, Fe... 2+ Increased regeneration rate leads to improved reaction efficiency.

[0022] Optionally, turbulent stirring may be used in the first addition step.

[0023] By adopting the above technical solution and using turbulent stirring, the position of the ferrous salt solution is moved forward and its fluidity is enhanced, resulting in more uniform mixing with wastewater. This shortens the ferrous salt dispersion time to 1.5 minutes and improves uniformity. At the same time, it can reduce stirring energy consumption, increase the COD degradation rate, and further improve the utilization rate of oxidant.

[0024] Optionally, in the secondary oxidation step, the frequency of the alternating magnetic field is adjusted based on the electrochemical impedance spectroscopy analysis results, specifically as follows: real-time acquisition of wastewater impedance spectra, calculation of Fe... 2+ The electron transfer rate with H2O2 is measured; if the electron transfer rate is less than the first threshold, the magnetic field frequency is increased and the magnetic field strength is increased simultaneously; if the electron transfer rate is greater than the second threshold, the magnetic field frequency is decreased to suppress side reactions.

[0025] By employing the above technical solution, impedance spectrum data is acquired through an electrode array, and Fe is calculated. 2+ Electron transfer rate with H2O2. When the rate is <0.5 mol / (m²·s), increasing the magnetic field frequency to 50 Hz and strengthening the intensity to 200 mT increases the free radical generation rate by 45%. Byproduct suppression: When the rate is >1.2 mol / (m²·s), decreasing the magnetic field frequency to 10 Hz reduces excessive oxidation side reactions, decreasing the byproduct generation rate from 20% to 8%. Electrochemical impedance spectroscopy analysis visualizes the redox efficiency, allowing for adjustment of the magnetic field based on actual efficiency to maintain oxidation effects, improve wastewater purification efficiency, and reduce resource waste.

[0026] Optionally, in the complexation reaction step, the magnetic powder is added by rotational addition, and a local magnetic field is initially applied to the magnetic powder during the rotational addition process; the strength of the local magnetic field is adjusted according to the dispersion of the magnetic powder; and the settling rate of the magnetic powder is obtained. If the settling rate of the magnetic powder is greater than a third threshold, an acoustic oscillator is used to assist in dispersion.

[0027] By adopting the above technical solution, magnetic powder is adsorbed by a local magnetic field and added by rotation, so that it is evenly dispersed to various parts of the wastewater. The magnetic powder adsorption rate is improved, thus improving the dispersion effect. The cavitation effect destroys the magnetic powder agglomerates, delays the aggregation of magnetic powder, and thus slows down the settling rate. The sludge volume is reduced by 35%, the magnetic powder recycling rate is increased by 60%, and the wastewater purification efficiency is improved.

[0028] Optionally, in the second dosing step, the delay setting time is dynamically adjusted through electrochemical noise analysis: a reference electrode and a working electrode are set in the wastewater obtained after the first dosing step, and current noise signals are collected; if the noise amplitude is greater than the fourth threshold, the first adjustment step is executed.

[0029] First adjustment: Extend the delay setting time, and then execute the second dosing step according to the extended delay setting time;

[0030] Following the second dosing step, a feedback judgment step is also included;

[0031] Feedback judgment: After the second dosing step is completed, if the noise frequency of the wastewater is greater than the fifth threshold, then the feedback step is executed;

[0032] Feedback: The delay setting time has been shortened and updated to a new delay setting time, and the atomization pressure has been increased.

[0033] By adopting the above technical solution, the current noise amplitude reflects the degree of Fe²⁺ accumulation. Extending the delay time to 30 seconds ensures that Fe²⁺... 2+ Sufficient dispersion, with dispersion uniformity improved from 90% to 98%; noise frequency feedback (>100Hz): high-frequency noise signals indicate uncontrolled H2O2 decomposition, shortening the delay to 10 seconds and increasing the atomization pressure to 0.5MPa, improving H2O2 utilization rate from 60% to 85%; by adjusting the delay setting time through noise amplitude and frequency, the actual reaction situation can be accurately reflected, and Fe can also be maintained. 2+ Ensure thorough dispersion, determine the timing of hydrogen peroxide introduction, and further reduce Fe. 2+ Premature precipitation, while maintaining the balance between hydrogen peroxide and Fe. 2+ The two are thoroughly mixed, and work together to treat wastewater, improving the utilization rate of the oxidant and the efficiency of wastewater treatment.

[0034] Optionally, in the first adjustment step, the formula for calculating the delay setting duration is:

[0035] ;

[0036] In the formula, Set the duration for the initial delay. The fourth threshold, For the maximum allowable noise amplitude, This represents the actual measured noise amplitude. ,and The increase depends on whether the volume of wastewater being treated increases or the complexity of the wastewater increases.

[0037] By adopting the above technical solution and adjusting the delay setting time non-linearly, a true fit can be achieved, Fe 2+ The dispersion efficiency can be improved, and through dynamic adjustment, Fe can be promoted. 2+ When mixed with hydrogen peroxide, it improves the efficiency of subsequent wastewater treatment.

[0038] Optionally, the secondary oxidation step further includes dynamically adjusting the alternating magnetic field strength and atomizing spray pressure, wherein the alternating magnetic field strength and atomizing spray pressure are coordinated and controlled by an edge computing module.

[0039] Real-time data collection of wastewater COD degradation rate, H2O2 residual concentration, and magnetic field frequency is input into a pre-trained neural network model.

[0040] If the model output predicts a reaction efficiency of less than 85%, then simultaneously increase the magnetic field strength to the maximum value, the atomization pressure to the maximum value, and reduce the stirring speed by 10%~20%.

[0041] If the model output predicts a byproduct generation rate greater than 15%, then the magnetic field frequency and atomization pressure will be adjusted inversely.

[0042] By adopting the above technical solutions and through prediction and comparison, the magnetic field strength and atomization spray pressure can be finely adjusted to reduce overall energy consumption and improve COD removal rate.

[0043] Optionally, the delay setting duration With magnetic field frequency Cooperative optimization through coupled algorithms:

[0044] Establish The empirical formula, where To be with wastewater Positive correlation coefficient If the actual COD removal rate deviates from the formula's predicted value by more than 10%, the adaptive learning module will be triggered to update. The value is then adjusted, and the magnetic field energy and delay time weights are redistributed.

[0045] This scheme is used to provide a baseline delay time, combined with... With magnetic field frequency ( The initial parameters are determined to adapt to wastewater with different pollution loads; the pre-processing scheme uses noise amplitude calculations to dynamically correct the delay time based on the baseline value, achieving real-time fine-tuning, suitable for short-term rapid response, and solving Fe 2+ Instantaneous problems such as uneven dispersion or uncontrolled decomposition of H2O2.

[0046] By adopting the above technical solution, and by dynamically adjusting the alternating magnetic field strength and atomizing spray pressure, Fe can be effectively promoted. 2+ When mixed with hydrogen peroxide, it can promote the generation of free radicals, improve wastewater treatment efficiency, and increase oxidant utilization.

[0047] Secondly, the wastewater recycling and treatment system provided in this application adopts the following technical solution:

[0048] A wastewater recycling and treatment system includes the following modules:

[0049] Primary oxidation module: Adjusts the acidity of the wastewater and introduces ozone for primary oxidation;

[0050] Premixing and secondary oxidation module: It is used to receive the primary oxidation wastewater produced by the primary oxidation module, add and mix ferrous salt solution, add hydrogen peroxide, and apply an alternating magnetic field for secondary oxidation. During the oxidation process, the pH is monitored and acid is replenished.

[0051] Aeration and neutralization module: Used to receive the secondary oxidation wastewater produced by the premixing and secondary oxidation module, aerate the secondary oxidation wastewater with ozone, add carbonate to adjust the pH to 5-6, and generate pre-neutralized wastewater;

[0052] Complexation reaction module: Used to receive the pre-neutralized wastewater obtained from the aeration and neutralization module, simultaneously atomize and spray the complexing defluoridating agent into the pre-neutralized wastewater and add magnetic powder by rotation, stir and react to obtain complexation reaction wastewater;

[0053] Secondary neutralization and flocculation module: used to receive complexation reaction wastewater, add alkaline solution to the complexation reaction wastewater to adjust the pH to 6-7, add coagulant aid, stir in laminar flow, and let stand to separate the supernatant.

[0054] By adopting the above technical solution, the system first undergoes acidity adjustment and primary oxidation through a primary oxidation module. Then, a ferrous salt solution is added through a premixing and secondary oxidation module, followed by the addition of hydrogen peroxide and the application of an alternating magnetic field for secondary oxidation. Aeration and pH adjustment are then performed through an aeration and neutralization module. Finally, complexation and flocculation occur sequentially through a complexation reaction module and a secondary neutralization and flocculation module, yielding a supernatant. By integrating ozone oxidation, magnetic field-enhanced Fenton, and magnetic powder complexation modules, combined with intelligent control (such as edge computing and electrochemical feedback), a closed-loop treatment system is formed. Compared to traditional systems where each unit operates independently and lacks coordinated control, this system achieves efficient, stable, and low-consumption wastewater treatment through modular design and intelligent algorithms.

[0055] In summary, this application includes at least one of the following beneficial technical effects:

[0056] 1. Counter-rotating acid addition combined with clockwise stirring creates a shear flow field, shortening pH adjustment time to 5-8 minutes and increasing ozone utilization to 85%; droplet size control (1-3mm): improves the uniformity of ferrous salt solution dispersion and avoids localized Fe... 2+ If the concentration is too high, reduce Fe. 3+ The risk of precipitation is reduced, and the Fe content is decreased by delaying the addition of hydrogen peroxide. 2+ Premature reaction enhances the reaction efficiency, and spraying reduces oxidant waste while increasing hydrogen peroxide coverage. Furthermore, reverse stirring and the addition of ferrous salt solution allow Fe... 2+ Uniform dispersion reduces premature precipitation caused by excessive concentrations, thereby reducing oxidant waste, improving oxidant utilization, and increasing oxidation efficiency.

[0057] 2. By adjusting the delay setting time non-linearly, a true fit can be achieved, Fe 2+ The dispersion efficiency can be improved, and through dynamic adjustment, Fe can be promoted. 2+ When mixed with hydrogen peroxide, it improves the efficiency of subsequent wastewater treatment.

[0058] 3. By dynamically adjusting the alternating magnetic field strength and atomizing spray pressure, Fe can be effectively promoted. 2+ When mixed with hydrogen peroxide, it can promote the generation of free radicals, improve wastewater treatment efficiency, and increase oxidant utilization. Attached Figure Description

[0059] Figure 1 This is a flowchart of the wastewater recycling and reuse treatment process in the embodiments of this application. Detailed Implementation

[0060] The following combination Figure 1This application will be described in further detail.

[0061] This embodiment discloses a wastewater recycling process.

[0062] Reference Figure 1 The wastewater recycling process includes the following steps:

[0063] Primary oxidation: Add acid solution by rotating counterclockwise and simultaneously start clockwise stirring to adjust the pH of the wastewater to acidic. Then, introduce ozone and react for 15-30 minutes to generate primary oxidation wastewater.

[0064] Specifically, four stainless steel reaction vessels (2m³ in volume) are connected in series. The material is 316L, and the inner wall is polished (Ra≤0.8μm). Each reaction vessel is equipped with a two-way stirring system (clockwise stirring paddle + counterclockwise rotating feeding plate) with a motor power of 5.5kW; a rotating feeding plate (droplet size control module, accuracy ±0.5mm); a ring pipe atomizing spray system (spray head pressure 0.2~0.5MPa, atomized particle size 20~50μm); a magnetic field device: an electromagnet group (magnetic field strength 50~200mT, frequency 10~50Hz), externally placed inside the reaction vessel for secondary oxidation; a pH sensor, an ORP sensor, a turbidity sensor, and a magnetic flux sensor are installed inside the reaction vessel.

[0065] Wastewater (initial COD=1500mg / L, pH=7.2) was injected into the first reaction tank; sulfuric acid solution (concentration 10%) was added counterclockwise at a rate of 5L / min, and clockwise stirring (speed 120rpm) was started simultaneously; the pH of the wastewater was adjusted to 2.8, and then ozone (concentration 50mg / L) was introduced through the bottom aerator, and the reaction was carried out for 25 minutes; the stirring Reynolds number Re=4500 (turbulent mode), and the ozone addition acceleration rate was 0.8L / min.

[0066] Premixing and secondary oxidation: including the first addition step, the second addition step, the secondary oxidation step, and the detection step;

[0067] First additive: Ferrous salt solution is added to the primary oxidation wastewater by counter-current stirring, controlling the droplet size to 1~3mm, and stirring is carried out in a turbulent manner;

[0068] Second adjuvant: based on the delay duration. Atomized spray of hydrogen peroxide solution;

[0069] Secondary oxidation: Simultaneously apply an alternating magnetic field and react for 30-45 minutes to obtain secondary oxidized wastewater;

[0070] Proportional monitoring: monitoring Fe 2+ / Fe 3+ The ratio, if Fe3+ If the proportion is greater than 20%, reduce the hydrogen peroxide spray pressure and increase the magnetic field frequency to the upper limit.

[0071] Specifically, the primary oxidation wastewater is pumped into the second reaction vessel. Under counter-current stirring (100 rpm), a FeSO4 solution (0.1 mol / L concentration) is added via a rotating feed pan, with droplet size controlled at 1.5 ± 0.3 mm. Turbulent stirring (Re = 4200) is maintained for 2 minutes to ensure Fe... 2+ Dispersion uniformity ≥95%.

[0072] Second additive (H2O2 spray): Delay time (Initial settings) Start the loop atomizer spraying of 30% H2O2 solution; spray pressure 0.3MPa, forming a cone-shaped fog curtain to cover the reaction zone.

[0073] Secondary oxidation: Start the electromagnet assembly and apply an alternating magnetic field (initial strength 100mT, frequency 30Hz); react for 35 minutes, monitoring Fe in real time. 2+ / Fe 3+ Ratio; when the ORP sensor detects Fe 3+ When the proportion is greater than 20%: reduce the H2O2 spray pressure to 0.2MPa; increase the magnetic field frequency to 50Hz and the intensity to 150mT.

[0074] Detection: Monitor the pH value of the reaction solution in real time. If the pH > 3.5, the acid replenishment mechanism will be triggered.

[0075] Specifically, the pH of the reaction solution is monitored in real time. When the pH is greater than 3.5, the acid replenishment mechanism is triggered. Sulfuric acid solution is added by rotating the feed pan (at a rate of 2L / min) until the pH is restored to 3.0±0.2.

[0076] Aeration and neutralization: Ozone aeration is performed on the secondary oxidation wastewater, and carbonate is added to adjust the pH to 5-6 to generate pre-neutralized wastewater;

[0077] Specifically, the secondary oxidation wastewater is transferred to the third reaction tank, where ozone (concentration 30 mg / L, rate 1.0 L / min) is introduced through the bottom aeration head for 15 minutes; sodium carbonate solution (concentration 5%) is added to adjust the pH to 5.5;

[0078] Complexation reaction: Simultaneously atomize and spray the complexing defluoridating agent into the pre-neutralized wastewater and add magnetic powder by rotation. Stir and react for 10-20 minutes to obtain complexing reaction wastewater.

[0079] Specifically, the pre-neutralized wastewater is pumped into the fourth reaction tank, where atomized spraying of the defluorinating agent (polyacrylamide, concentration 0.05%) and rotary addition of magnetic powder (Fe3O4, particle size ≤50μm) are carried out.

[0080] When adding magnetic powder, a local magnetic field (intensity 5mT) is applied to guide the dispersion of the magnetic powder, and an acoustic oscillator (frequency 30kHz) is used to suppress sedimentation; the reaction is stirred for 15 minutes (rotation speed 80rpm).

[0081] Secondary neutralization and flocculation: Add alkaline solution to the complexation reaction wastewater to adjust the pH to 6-7, add coagulant aid, stir in laminar flow for 10-15 minutes, and let stand to separate the supernatant.

[0082] Specifically, add NaOH solution (concentration 10%) to adjust pH to 6.8; add polyaluminum chloride (PAC, dosage 30 mg / L), stir in laminar flow (flow rate 0.15 m / s) for 12 minutes; let stand for precipitation for 45 minutes, and separate the supernatant (COD=85 mg / L, pH=6.9).

[0083] In other embodiments, during the secondary oxidation step, the frequency of the alternating magnetic field is adjusted based on the electrochemical impedance spectroscopy analysis results, specifically as follows: The wastewater impedance spectrum is acquired in real time, and Fe is calculated. 2+ The electron transfer rate with H2O2 is measured; if the electron transfer rate is less than the first threshold, the magnetic field frequency is increased and the magnetic field strength is increased simultaneously; if the electron transfer rate is greater than the second threshold, the magnetic field frequency is decreased to suppress side reactions.

[0084] In other embodiments, in the complexation reaction step, the magnetic powder is added by rotational addition, and a local magnetic field is initially applied to the magnetic powder during the rotational addition process; the strength of the local magnetic field is adjusted according to the dispersion of the magnetic powder; and the settling rate of the magnetic powder is obtained. If the settling rate of the magnetic powder is greater than a third threshold, an acoustic oscillator is used to assist in dispersion.

[0085] Specifically, the rotation speed is set to 30 rpm, and the magnetic powder is evenly sprinkled into the reaction vessel through rotation; before adding the magnetic powder, it is first sieved to ensure that the magnetic powder particle size is ≤50μm, and the addition rate is 5kg / h.

[0086] A ring-shaped electromagnet assembly is installed at the rotary feeding position. The ring-shaped electromagnet assembly is turned on, and the initial magnetic field strength is set to 10mT, with the direction perpendicular to the rotation axis of the magnetic powder being added. The magnetic field guides the magnetic powder to disperse radially along the reaction vessel, avoiding accumulation in the central area.

[0087] Real-time monitoring of dispersion: The magnetic flux sensor collects data every 10 seconds to calculate the magnetic powder distribution density; the dispersion threshold is set to ≥95% (i.e., the magnetic powder density deviation per unit volume is ≤5%). Magnetic field strength adjustment: If the dispersion is <95%, the magnetic field strength is gradually increased to 15mT to improve the magnetic powder adsorption force; if the dispersion is ≥95%, the magnetic field strength is maintained at 10mT to save energy.

[0088] Real-time detection of settling rate: The settling rate of magnetic powder is monitored by a laser scattering instrument, with a threshold set at 0.1 mm / s; if the settling rate is >0.1 mm / s, it is determined that the magnetic powder is agglomerated or settling too fast. Start the acoustic oscillator: Trigger 30 kHz ultrasound, and the cavitation effect generates microbubbles to break up the magnetic powder agglomerates; continue oscillation for 5 minutes until the settling rate drops below 0.05 mm / s.

[0089] At this time, the complexation reaction proceeds simultaneously. A 0.05% polyacrylamide solution is added concurrently via an atomizing spray system at a pressure of 0.3 MPa. The complexing agent droplet size is controlled to be 20-30 μm, covering the magnetic powder dispersion area. A bidirectional stirring system is operated (clockwise stirring paddle at 80 rpm, counterclockwise feeding plate at 30 rpm); the reaction time is 15 minutes to ensure sufficient contact between the magnetic powder, complexing agent, and contaminants.

[0090] Through rotation-magnetic field synergistic dispersion, rotating feeding combined with a local magnetic field achieves directional dispersion of magnetic powder, avoiding the energy waste of mechanical stirring; the magnetic field strength is dynamically adjusted to precisely match dispersion requirements. Acoustic-sedimentation feedback control: based on a sedimentation rate threshold triggering acoustic oscillation, it solves the problem of magnetic powder agglomeration; cavitation effect improves dispersion efficiency and reduces dependence on chemical agents.

[0091] In other embodiments, in the second dosing step, the delay setting time is dynamically adjusted through electrochemical noise analysis: a reference electrode and a working electrode are set in the wastewater obtained after the first dosing step, and current noise signals are collected; if the noise amplitude is greater than the fourth threshold, the first adjustment step is executed.

[0092] First adjustment: Extend the delay setting duration. The formula for calculating the delay setting duration is:

[0093] ;

[0094] In the formula, Set the duration for the initial delay. The fourth threshold, For the maximum allowable noise amplitude, This represents the actual measured noise amplitude. ,and The increase depends on whether the volume of wastewater being treated increases or the complexity of the wastewater increases.

[0095] in, ,in This indicates the current wastewater volume (or flow rate). This indicates a reference wastewater volume baseline value (such as average load). To adjust the coefficient, the sensitivity of the baseline to the wastewater volume is controlled. ;

[0096] or ,in, This indicates the current complexity of the wastewater (e.g., pollutant concentration). This indicates a reference complexity baseline value. Represents the nonlinear adjustment coefficient ( And with smooth growth).

[0097] Then, the second dosing step is performed according to the extended delay setting time.

[0098] Following the second dosing step, a feedback judgment step is also included;

[0099] Feedback judgment: After the second dosing step is completed, if the noise frequency of the wastewater is greater than the fifth threshold, then the feedback step is executed;

[0100] Feedback: The delay setting time has been shortened and updated to a new delay setting time, and the atomization pressure has been increased.

[0101] Specifically, the reaction vessel (volume 2m³) is equipped with a two-way stirring system and an electrochemical workstation; the electrode system includes: a reference electrode: an Ag / AgCl electrode, installed on the side wall of the reaction vessel; and a working electrode: a platinum electrode (surface area 10cm²), spaced 5cm from the reference electrode.

[0102] Data acquisition module: Electrochemical noise analyzer (sampling frequency 1kHz, accuracy ±1nA);

[0103] Noise amplitude ( ) and frequency ( It displays and transmits data to the PLC control system in real time.

[0104] Initial delay: 15 seconds;

[0105] Noise amplitude threshold: (Fourth threshold) ;

[0106] Noise frequency threshold: (Fifth threshold).

[0107] Electrochemical noise signal acquisition and delay time calculation, electrode configuration and signal acquisition:

[0108] After the first addition step (ferrous salt addition) is completed, the reference electrode and working electrode are activated to collect the current noise signal; the electrochemical noise analyzer records the noise amplitude every 5 seconds. ) and frequency ( ).

[0109] Dynamic adjustment of delay time: conditional judgment: if Maintain the initial delay time ;

[0110] like Calculate the adjustment coefficient J, and adjust the delay time according to the formula:

[0111] ;

[0112] Determining the adjustment coefficient J (in two scenarios):

[0113] Scenario A (based on wastewater volume): ;

[0114] Parameter settings: (Reference wastewater volume) ;

[0115] Example: Current wastewater volume → .

[0116] Scenario B (based on complexity): ;

[0117] Parameter settings: (Refer to COD benchmark value) ;

[0118] Example: Current wastewater → .

[0119] Example of delay time calculation:

[0120] like , , , (Scenario A):

[0121] ;

[0122] Execute the second additive (H2O2 atomized spray).

[0123] Delayed addition: based on the adjusted delay time H2O2 spraying starts instantly;

[0124] Atomization parameter control: spray pressure 0.3MPa, forming a uniform fog curtain to cover the reaction zone.

[0125] Noise frequency monitoring: After H2O2 spraying is completed, the noise frequency is monitored in real time. ;

[0126] like The cause was determined to be either excessively rapid decomposition of H2O2 or uncontrolled free radical generation.

[0127] Feedback Adjustment: Reduced Delay Time: Update 80% of the original value ( (This is used in the second additive step for the next treatment of the same wastewater);

[0128] Increase atomization pressure: Increase spray pressure from 0.3MPa to 0.4MPa, refine droplets to below 30μm;

[0129] Record parameters: the adjusted parameters Stored in the database for reference in the next batch.

[0130] With the above settings, the dynamic range of the delay time is 15~30 seconds (the traditional fixed delay is 20 seconds, with an error of ±5 seconds); H2O2 utilization rate: Scenario A (J=1.45): utilization rate increased from 70% to 85%; Scenario B (J=1.22): utilization rate increased from 70% to 80%;

[0131] COD removal rate: After dynamic adjustment, the COD removal rate is stable at 90%~92% (80%~85% for traditional processes).

[0132] Byproduct formation rate: Noise frequency feedback control reduced the byproduct formation rate from 18% to 7%;

[0133] Energy consumption comparison: The unit processing energy consumption decreased from 1.0 kWh / m³ to 0.7 kWh / m³.

[0134] In other embodiments, the secondary oxidation step further includes dynamically adjusting the intensity of the alternating magnetic field and the atomizing spray pressure, wherein the intensity of the alternating magnetic field and the atomizing spray pressure are coordinated and controlled by an edge computing module.

[0135] Real-time data on wastewater COD degradation rate, H2O2 residual concentration, and magnetic field frequency are collected and input into a pre-trained neural network model. If the model output predicts a reaction efficiency of less than 85%, the magnetic field strength and atomization pressure are simultaneously increased to their maximum values, while the stirring speed is reduced by 10% to 20%.

[0136] If the model output predicts a byproduct generation rate greater than 15%, then the magnetic field frequency and atomization pressure will be adjusted inversely.

[0137] Specifically, the hardware equipment used includes an online COD detector using ultraviolet-visible spectroscopy (UV-Vis) to monitor the COD degradation rate (mg / (L·min)) in real time; an H2O2 electrochemical sensor to detect residual concentration (mg / L) with an accuracy of ±5%; and a magnetic field frequency monitoring module using a Hall effect sensor with a frequency range of 10~50Hz.

[0138] Edge computing module: Hardware: NVIDIA Jetson AGXXavier, computing power 32 TOPS; Pre-trained neural network model: based on LSTM architecture, input is COD degradation rate, H2O2 concentration, magnetic field frequency, output is reaction efficiency (%) and by-product generation rate (%).

[0139] Actuator: Alternating magnetic field generator: intensity 50~200mT, frequency 10~50Hz;

[0140] Atomizing spray system: pressure 0.2~0.5MPa, droplet size 20~50μm;

[0141] Variable frequency stirring motor: speed adjustment range 50~150rpm.

[0142] The specific steps are as follows: real-time data acquisition and model input, and sensor data synchronization: COD degradation rate (e.g., 0.8 mg / (L·min)), H2O2 residual concentration (e.g., 120 mg / L), and magnetic field frequency (e.g., 30 Hz) are collected every 5 seconds; the data is transmitted to the edge computing module via the Modbus protocol.

[0143] Neural network prediction: Input data is normalized and then fed into a pre-trained model; the output is a predicted value.

[0144] Response efficiency: The model predicts the current efficiency to be 78% (<85% threshold);

[0145] Byproduct generation rate: The model predicts it to be 18% (>15% threshold).

[0146] Dynamic control strategy execution: Scenario A (reaction efficiency < 85%): Increase magnetic field strength: from 100mT to 200mT (maximum value), magnetic field frequency maintained at 30Hz; Increase atomization pressure: from 0.3MPa to 0.5MPa (maximum value), droplet size refined to 20μm; Decrease stirring speed: from 120rpm to 96rpm (20% reduction), reduce turbulent energy consumption; Control objective: accelerate free radical generation to compensate for insufficient reaction efficiency.

[0147] Scenario B (byproducts > 15%): Reverse adjustment of magnetic field frequency: from 30Hz to 15Hz, while maintaining magnetic field strength at 100mT; reduction of atomization pressure: from 0.4MPa to 0.25MPa, to reduce excessive decomposition of H2O2; control objective: to inhibit excessive oxidation and reduce byproduct formation.

[0148] Real-time feedback and parameter optimization: Data closed-loop update: Data is re-collected every 2 minutes after adjustment to update the model input; if the reaction efficiency increases to above 85% or the byproduct decreases to below 15%, the current parameters are maintained; otherwise, a secondary adjustment is triggered (such as alternating between scenario A and scenario B).

[0149] In other embodiments, when high fluctuations occur in the operating conditions, the delay setting time is calculated using the noise amplitude as described above. When the operating conditions are stable, the delay setting duration is... With magnetic field frequency Cooperative optimization through coupled algorithms:

[0150] Establish The empirical formula, where To be with wastewater Positive correlation coefficient If the actual COD removal rate deviates from the formula's predicted value by more than 10%, the adaptive learning module will be triggered to update. The value is then adjusted, and the magnetic field energy and delay time weights are redistributed.

[0151] Specifically, initial parameter settings and formula application, wastewater characteristic input: initial COD value of wastewater ( =1200mg / L;

[0152] Calculate the proportionality constant k: ;

[0153] Delay time calculation: Set the initial magnetic field frequency ;

[0154] Calculate the delay time using the formula. : ;

[0155] The secondary oxidation process is executed, with the magnetic field and delay working in tandem: The alternating magnetic field is activated (frequency 30Hz, intensity 100mT); the delay time is then used to initiate the process. Then start the H2O2 atomization spray (pressure 0.3MPa).

[0156] Real-time data acquisition: COD degradation rate, H2O2 residual concentration and magnetic field frequency are recorded every 10 seconds.

[0157] Adaptive learning and parameter optimization, actual COD removal rate calculation: initial COD=1200mg / L, treated COD=150mg / L;

[0158] Actual removal rate = (1200-150) / 1200×100% = 87.5%.

[0159] Predicted values ​​and bias analysis: Model predicted removal rate = 82% (based on historical data training);

[0160] Deviation = (<10%, no adjustment triggered).

[0161] Example of triggering conditions:

[0162] If the actual removal rate is 70%, the predicted value is 82%, and the deviation is 14.6% (>10%), then perform the following operations:

[0163] Update the k value: Adjust k based on the direction of the deviation. If the actual removal rate is lower than the prediction, increase k to extend the delay time.

[0164] (γ=0.1 is the learning rate);

[0165] Redistribute magnetic field energy: Reduce the magnetic field frequency to 25Hz, while increasing the magnetic field strength to 150mT. The formula is updated as follows:

[0166] ;

[0167] Closed-loop feedback and process stability, continuous monitoring and iteration: The k-value and magnetic field parameters are updated after each batch of wastewater is treated; the database records the optimized parameters for the initial setting of the next batch.

[0168] This application also discloses a wastewater recycling and reuse system, comprising the following modules:

[0169] Primary oxidation module: Adjusts the acidity of the wastewater and introduces ozone for primary oxidation;

[0170] Premixing and Secondary Oxidation Module: This module receives the primary oxidation wastewater from the primary oxidation module, adds and mixes it with ferrous salt solution, then adds hydrogen peroxide, and applies an alternating magnetic field for secondary oxidation. During the oxidation process, it monitors the pH and replenishes acid as needed. It also monitors Fe... 2+ / Fe 3+ The ratio is used to adjust the frequency and intensity of the magnetic field.

[0171] Aeration and neutralization module: Used to receive the secondary oxidation wastewater produced by the premixing and secondary oxidation module, aerate the secondary oxidation wastewater with ozone, add carbonate to adjust the pH to 5-6, and generate pre-neutralized wastewater;

[0172] Complexation reaction module: Used to receive the pre-neutralized wastewater obtained from the aeration and neutralization module, simultaneously atomize and spray the complexing defluoridating agent into the pre-neutralized wastewater and add magnetic powder by rotation, stir and react to obtain complexation reaction wastewater;

[0173] Secondary neutralization and flocculation module: used to receive complexation reaction wastewater, add alkaline solution to the complexation reaction wastewater to adjust the pH to 6-7, add coagulant aid, stir in laminar flow, and let stand to separate the supernatant.

[0174] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wastewater recycling and reuse process, characterized in that: Includes the following steps: Primary oxidation: Add acid solution by rotating counterclockwise and simultaneously stir the wastewater clockwise to adjust the pH of the wastewater to acidic. Then, introduce ozone and react for 15-30 minutes to generate primary oxidized wastewater. Premixing and secondary oxidation: including the first addition step, the second addition step, the secondary oxidation step, and the detection step; First additive: Ferrous salt solution is added to the primary oxidation wastewater by counter-stirring, and the droplet size is controlled to be 1~3mm; Second adjuvant: based on the delay duration. Atomized spray of hydrogen peroxide solution; Secondary oxidation: Simultaneously apply an alternating magnetic field and react for 30-45 minutes to obtain secondary oxidized wastewater; Detection: Monitor the pH value of the reaction solution in real time. If the pH > 3.5, the acid replenishment mechanism will be triggered. Aeration and neutralization: Ozone aeration is performed on the secondary oxidation wastewater, and carbonate is added to adjust the pH to 5-6 to generate pre-neutralized wastewater; Complexation reaction: Simultaneously atomize and spray the complexing defluoridating agent into the pre-neutralized wastewater and add magnetic powder by rotation. Stir and react for 10-20 minutes to obtain complexing reaction wastewater. Secondary neutralization and flocculation: Add alkaline solution to the complexation reaction wastewater to adjust the pH to 6-7, add coagulant aid, stir in laminar flow for 10-15 minutes, and let stand to separate the supernatant; In the second dosing step, the delay setting time is dynamically adjusted through electrochemical noise analysis: a reference electrode and a working electrode are set in the wastewater obtained after the first dosing step, and current noise signals are collected; if the noise amplitude is greater than the fourth threshold, the first adjustment step is executed. First adjustment: Extend the delay setting time, and then execute the second dosing step according to the extended delay setting time; Following the second dosing step, a feedback judgment step is also included; Feedback judgment: After the second dosing step is completed, if the noise frequency of the wastewater is greater than the fifth threshold, then the feedback step is executed; Feedback: The delay setting time has been shortened and updated to a new delay setting time, and the atomization pressure has been increased; In the first adjustment step, the formula for calculating the delay setting duration is: ； In the formula, Set the duration for the initial delay. The fourth threshold, For the maximum allowable noise amplitude, This represents the actual measured noise amplitude. ,and The increase depends on the increase in wastewater treatment volume or the increase in wastewater complexity.

2. The wastewater recycling treatment process according to claim 1, characterized in that: The premixing and secondary oxidation steps also include: a proportion monitoring step; Proportional monitoring: monitoring Fe 2+ / Fe 3+ The ratio, if Fe 3+ If the proportion is greater than 20%, the hydrogen peroxide spray pressure will be reduced and the magnetic field frequency will be increased to the upper limit.

3. The wastewater recycling treatment process according to claim 2, characterized in that: In the first addition step, stirring is performed using turbulent flow.

4. The wastewater recycling treatment process according to claim 3, characterized in that: In the complexation reaction step, the magnetic powder is added by rotation, and a local magnetic field is initially applied to the magnetic powder during the rotation process. The strength of the local magnetic field is adjusted according to the dispersion of the magnetic powder, and the settling rate of the magnetic powder is obtained. If the settling rate of the magnetic powder is greater than the third threshold, an acoustic oscillator is used to assist in dispersion.

5. The wastewater recycling treatment process according to claim 2, characterized in that: The secondary oxidation step also includes dynamically adjusting the intensity of the alternating magnetic field and the atomizing spray pressure. The intensity of the alternating magnetic field and the atomizing spray pressure are coordinated and controlled by an edge computing module. Real-time data collection of wastewater COD degradation rate, H2O2 residual concentration, and magnetic field frequency is input into a pre-trained neural network model. If the model output predicts a reaction efficiency of less than 85%, then simultaneously increase the magnetic field strength to the maximum value, the atomization pressure to the maximum value, and reduce the stirring speed by 10%~20%. If the model output predicts a byproduct generation rate greater than 15%, then the magnetic field frequency and atomization pressure will be adjusted inversely.

6. The wastewater recycling treatment process according to claim 1, characterized in that: The delay setting duration With magnetic field frequency Cooperative optimization through coupled algorithms: Establish The empirical formula, where To be with wastewater Positive correlation coefficient ; If the actual COD removal rate deviates from the formula's predicted value by more than 10%, the adaptive learning module will be triggered to update. The value is then adjusted, and the magnetic field energy and delay time weights are redistributed.

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