Sectional enhanced Fenton reaction wastewater treatment reactor and method

Abstract

The invention belongs to the technical field of sewage treatment, and particularly relates to a sectional enhanced Fenton reaction wastewater treatment reactor and method.The reactor comprises three functional areas including a rapid mixing area, a main reaction area and a curing area, the volume ratio of the rapid mixing area is 10%-15%, and a stirrer with the stirring power being 1.5-2.0 kW / m is arranged in the rapid mixing area; the volume ratio of the main reaction area is 60-70%, and the main reaction area is provided with a stirrer with the stirring power of 0.5-1 kW / m; the volume ratio of the curing area is 15-20%, and a stirrer with the stirring power of 0.2-5 kW / m is arranged in the curing area; and the rapid mixing area, the main reaction area and the curing area are separated by vertical porous distribution plates. According to the principle of'mixing, full reaction and residual oxidation 'of the Fenton reaction, three stages of zones of'fast, medium and slow' are specifically arranged, and corresponding stirring power configuration is set, so that an ideal step-by-step reaction environment is created for the Fenton reaction, the reaction rate and the reaction thoroughness are ensured, and the effluent quality is more stable.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically a segmented enhanced Fenton reaction wastewater treatment reactor and method. Background Technology

[0002] The Fenton reaction, as a highly efficient advanced oxidation technology, is widely used in the treatment of recalcitrant organic wastewater. Its core principle is the use of Fe... 2+ Fenton reactors react with H₂O₂ under acidic conditions to generate highly oxidizing hydroxyl radicals (·OH), which oxidize and decompose organic matter in water. Existing Fenton reactors are mostly single-chamber structures, which have the following main problems: First, insufficient or untimely mixing of wastewater and reagents leads to localized over- or under-dosage of reagents, affecting ·OH generation efficiency; second, the reaction process lacks segmented control, with the mixing process, main reaction process, and residual substance oxidation process interfering with each other, resulting in incomplete pollutant degradation and difficulty in escaping microbubbles; third, dosing relies heavily on manual experience, failing to dynamically adjust and optimize based on water quality and flow rate, leading to unstable treatment effects and high Fenton reagent costs.

[0003] Therefore, developing a Fenton reactor system that can optimize the reaction process from a physical structure perspective and achieve precise dosing from a control strategy perspective is of great significance for improving processing efficiency and reducing operating costs. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0005] In a first aspect, the present invention provides a segmented enhanced Fenton reaction wastewater treatment reactor, the reactor having a cuboid structure and comprising three functional zones: a rapid mixing zone, a main reaction zone, and a maturation zone, wherein: The rapid mixing zone accounts for 10%~15% of the volume, the main reaction zone accounts for 60%~70%, and the main reaction zone is equipped with a stirrer with a stirring power of 0.5-1kW / m³. The maturation zone accounts for 15%~20% of the volume. The rapid mixing zone, main reaction zone, and maturation zone are equipped with stirrers with different stirring powers. The rapid mixing zone, main reaction zone, and maturation zone are all separated by a vertical porous distribution plate. The vertical porous distribution plate has holes with a "smaller at the top and larger at the bottom" shape, and the hole diameter is calculated and determined according to the following formula: ; Where Q is the inlet flow rate (m³ / s), n is the number of openings, Cd is the flow coefficient of the opening, Hi is the hydrostatic pressure at the opening, and g is the gravitational acceleration, which is 9.8 m / s²; the opening ratio is controlled between 15% and 25%.

[0006] Preferably, Fe is connected in the front region of the rapid mixing zone.2+ The system includes a solution storage tank, an H2O2 solution storage tank, and is also connected to a sulfuric acid storage tank and an alkali solution storage tank.

[0007] Preferably, it also includes an influent monitoring module, an effluent monitoring module, a reactor process water quality monitoring module, and a central controller; The influent monitoring module is installed on the influent pipe of the pH adjustment tank, and includes a first COD online monitor and a first pH online monitor; Water effluent monitoring module: installed at the water outlet of the maturation zone, including a second online COD monitor, a second online pH monitor, and an online hydrogen peroxide concentration monitor; The reactor process water quality monitoring module includes pH sensors located in three functional areas. The central controller is electrically connected to the inlet water monitoring module, the outlet water monitoring module, the reactor process water quality monitoring module, and the metering pump. The central controller has a pre-stored control program, which is used to receive monitoring data and calculate and output control commands to each metering pump.

[0008] The present invention also provides a segmented enhanced Fenton reaction wastewater treatment method, which employs the segmented enhanced Fenton reaction wastewater treatment reactor described in any of the above claims, specifically including: 1) Adjust the pH of the water to around 3.0-3.5 in advance; 2) After the influent enters the rapid mixing zone, Fe is added via a metering pump. 2+ The wastewater and the reagent are mixed in a solution and an H2O2 solution. In the rapid mixing zone, the wastewater and the reagent are vigorously mixed at the molecular level by a stirrer to quickly start the Fenton reaction and maximize the initial generation rate of ·OH free radicals. The hydraulic retention time is designed to be 1~3 min. 3) After the initial reaction occurs in the rapid mixing zone, the mixture flows through the vertical porous distribution plate to the main reactor; the vertical porous distribution plate disperses the water flow into multiple fine and uniform jets that enter the main reaction zone, with a hydraulic residence time of 15~30 min; 4) In the main reactor, the mixture is agitated by a stirrer to maintain mass transfer efficiency and ensure that the Fenton reaction is fully carried out in the main reactor; 5) The effluent from the main reactor flows evenly through a vertical porous distribution plate to the maturation zone; 6) The function of the maturation zone is to allow the Fenton reaction to end smoothly, promote the further oxidation of residual pollutants and intermediate products in the Fenton reactor, and ensure that the Fenton reaction is completely completed; 7) The effluent from the maturation zone is retained in the subsequent neutralization sedimentation tank through an overflow weir.

[0009] Preferably, during the reaction process, the central controller completes five control processes, specifically: feedforward pre-control, feedback fine-tuning, pH coordinated control, ferrous iron dosing linkage control, and main reactor COD effluent control.

[0010] Preferably, the feedforward pre-control includes: the central controller receiving the influent flow rate Q and influent COD from the influent monitoring module, and calculating the feedforward dosage M of hydrogen peroxide based on the preset H2O2 / COD mass ratio. 前馈 And the feedforward dosage N of Fe2+; M 前馈 = k1×COD 进水 ×Q; Wherein, k1 is the feedforward coefficient, which is determined based on the H2O2 / COD ratio determined in the small-scale test; The value of the Fe2+ feedforward dosage N is determined based on the feedforward linkage M, ensuring the reaction of H2O2 and Fe. 2+ The ratio of dosage (mg / L) to the amount added is 1:1-1:3.

[0011] Preferably, the feedback fine-tuning includes: the central controller will adjust the COD... 出水 With the preset COD 目标 The comparison is performed, and the following PID feedback control algorithm is executed: Hydrogen peroxide dosage feedback correction ΔM: ΔM = Kp1×(COD 出水 COD 目标 )+Ki1×∫(COD 出水 COD 目标 )dt; Where Kp1 and Ki1 are the proportional coefficient and integral coefficient in the PID feedback; Final hydrogen peroxide dosage M 最终 For feedforward quantity M 前馈 Sum of feedback corrections: M 最终 = M 前馈 + ΔM; The central controller is based on the residual H2O2 concentration M 出水 To constrain and control the amount of H2O2 added: if M 出水 If the amount continuously exceeds the safety threshold, the final dosage will be automatically multiplied by a discount factor α (0.95) to gradually reduce the dosage and avoid waste.

[0012] Preferably, pH coordinated control includes: a central controller converting the effluent pH value using pH... 出水 With the preset pH 目标 The comparison is performed, and the PID control algorithm is executed. Sulfuric acid dosage correction instruction: ΔP = Kp2 × (pH) 出水 - pH 目标 )+Ki2×∫(pH 出水 - pH 目标)dt, through this command, dynamically adjust the speed of the first metering pump to maintain the reaction system at the optimal pH environment; Meanwhile, based on the pH gradient changes monitored in the three reaction zones, optimization and control suggestions were proposed.

[0013] Preferably, the ferrous oxide dosing linkage control includes: a central controller, based on the final hydrogen peroxide dosage, according to a preset H2O2 / Fe ratio. 2+ The molar ratio is used to calculate the dosage of ferrous salt and control the metering pump to add it synchronously.

[0014] Preferably, the COD effluent control of the main reactor includes: system monitoring of the COD concentration at the outlet of the main reaction zone. 主 The COD decrease rate V in the main reaction zone is calculated. When V decreases abnormally, it is considered an early signal of reaction obstruction. Based on this, the controller strengthens the regulation in advance, temporarily increases Kp, realizes "advanced regulation", and improves the system's anti-interference ability.

[0015] The beneficial effects of this invention are as follows: 1) Based on the Fenton reaction principle of "from mixing to full reaction and then to residual oxidation", this invention sets up a three-level zone (fast-medium-slow) with corresponding stirring power configuration, creating an ideal step-by-step reaction environment for the Fenton reaction, ensuring the reaction rate and the thoroughness of the reaction, and making the effluent water quality more stable.

[0016] 2) This invention innovatively utilizes a vertical baffle design as a porous distribution plate with uniform water distribution function. The pore size is determined by combining fluid mechanics principles, realizing the functional integration of functional separation and uniform water distribution. The structure is compact, which strengthens mixing and mass transfer from a physical source and improves the overall reaction efficiency.

[0017] 3) The intelligent control system proposed in this invention integrates the speed of feedforward, the accuracy of feedback, and the optimization capability of multi-parameter linkage, realizing precise dynamic optimization of reagent dosing, effectively avoiding reagent waste, and reducing the cost per ton of water treatment and sludge production.

[0018] 4) The reactor system of this invention has significantly enhanced resistance to shock loads. The multi-parameter, hierarchical intelligent control strategy enables the system to keenly sense and intelligently respond to internal and external changes, maintaining the system in optimal operation, and is particularly suitable for industrial wastewater treatment scenarios with large fluctuations in water quality and quantity. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings.

[0020] Figure 1 This is a schematic diagram of the main structure of the present invention.

[0021] Figure 2 This is a top view of the structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the vertical porous distribution plate in this invention.

[0023] In the diagram: 1. Rapid mixing zone; 2. Main reaction zone; 3. Maturation zone; 4. Vertical porous distribution plate; 5. Stirrer. Detailed Implementation

[0024] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0025] The essence of the Fenton reaction is Fe 2+ The rapid reaction with H₂O₂ to generate ·OH radicals (reaction rate constant k≈76 L / (mol·s)) is a typical "fast reaction," and its reaction efficiency is highly dependent on the initial homogeneity of the reactants. Insufficient mixing can lead to localized problems such as: ①Fe 2+ Excessive amount leads to ineffective decomposition of H2O2 (2Fe). 2+ +H₂O₂ + 2H⁺ = 2Fe 3+ +2H2O); ② Excess H2O2, ·OH free radicals quench each other (·OH + ·OH = H2O2, k≈5.5×10 9 Both L / (mol・s) and L / (mol・s) reduce free radical utilization.

[0026] Example 1: As Figures 1 to 3 As shown in the embodiment of the present invention, a segmented enhanced Fenton reaction wastewater treatment reactor is provided. The reactor has a cuboid structure and includes three functional zones: a rapid mixing zone 1, a main reaction zone 2, and a maturation zone 3. The reactor is characterized in that: The rapid mixing zone 1 accounts for 10%~15% of the total volume and is equipped with a stirrer 5 with a stirring power of 1.5-2.0 kW / m³; the main reaction zone 2 accounts for 60%~70% of the total volume and is equipped with a stirrer with a stirring power of 0.5-1 kW / m³; the maturation zone 3 accounts for 15%~20% of the total volume and is equipped with a stirrer with a stirring power of 0.2-5 kW / m³; For example... Figure 3 As shown, the rapid mixing zone, main reaction zone, and maturation zone are all separated by a vertical porous distribution plate 4. The vertical porous distribution plate 4 is provided with holes that are smaller at the top and larger at the bottom. The hole diameter is calculated and determined according to the following formula: ; Where Q is the inlet flow rate (m³ / s), n is the number of openings, Cd is the flow coefficient of the opening, Hi is the hydrostatic pressure at the opening, and g is the gravitational acceleration, which is 9.8 m / s²; the opening ratio is controlled between 15% and 25%.

[0027] Fe is connected in the front region of the rapid mixing zone. 2+ The system includes a solution storage tank, an H2O2 solution storage tank, and is also connected to a sulfuric acid storage tank and an alkali solution storage tank.

[0028] Based on automatic control considerations, it also includes an influent monitoring module, an effluent monitoring module, a reactor process water quality monitoring module, and a central controller; The influent monitoring module is installed on the influent pipe of the pH adjustment tank, and includes a first COD online monitor and a first pH online monitor; Water effluent monitoring module: installed at the water outlet of the maturation zone, including a second online COD monitor, a second online pH monitor, and an online hydrogen peroxide concentration monitor; The reactor process water quality monitoring module includes pH sensors located in three functional areas. The central controller is electrically connected to the inlet water monitoring module, the outlet water monitoring module, the reactor process water quality monitoring module, and the metering pump. The central controller has a pre-stored control program.

[0029] When treating wastewater using the segmented enhanced Fenton reaction wastewater treatment reactor of the present invention, the following steps are included: 1) Adjust the pH of the water to around 3.0-3.5 in advance; 2) After the influent enters the rapid mixing zone, Fe is added via a metering pump. 2+ The wastewater and the reagent are mixed in a solution and an H2O2 solution. In the rapid mixing zone, the wastewater and the reagent are vigorously mixed at the molecular level by a stirrer to quickly start the Fenton reaction and maximize the initial generation rate of ·OH free radicals. The hydraulic retention time is designed to be 1~3 min. 3) After the initial reaction occurs in the rapid mixing zone, the mixture flows through a vertical porous distribution plate into the main reactor. The vertical porous distribution plate disperses the water flow into multiple fine, uniform jets that enter the main reaction zone. This uniform water distribution ensures the uniformity of reactant concentration across the cross-section of the main reaction zone, eliminates short-circuit flow, and greatly enhances the mass transfer process, laying a solid foundation for subsequent efficient reactions. The hydraulic retention time is 15–30 min. 4) In the main reactor, the mixture is agitated by a stirrer to maintain mass transfer efficiency and ensure that the Fenton reaction is fully carried out in the main reactor; 5) The effluent from the main reactor flows evenly through a vertical porous distribution plate to the maturation zone; 6) The function of the maturation zone is to ensure the smooth completion of the Fenton reaction, promoting further oxidation of residual contaminants and intermediate products in the Fenton reactor, and ensuring the complete completion of the Fenton reaction. The maturation zone also facilitates the polymerization and escape of microbubbles generated by the Fenton reaction. 7) The effluent from the maturation zone is retained in the subsequent neutralization sedimentation tank through an overflow weir.

[0030] During the reaction process, the central controller completes five control processes: feedforward pre-control, feedback fine-tuning, pH coordinated control, ferrous iron dosing linkage control, and main reactor COD effluent control.

[0031] The feedforward control includes: the central controller receiving the influent flow rate Q and influent COD from the influent monitoring module, and calculating the feedforward dosage M of hydrogen peroxide based on the preset H2O2 / COD mass ratio. 前馈 and Fe 2+ Feedforward injection amount N; M 前馈 = k1×COD 进水 ×Q; Wherein, k1 is the feedforward coefficient, which is determined based on the H2O2 / COD ratio determined in the small-scale test; Fe 2+ The value of the feedforward dosage N is determined based on the feedforward linkage of M, ensuring the reaction of H2O2 and Fe. 2+ The ratio of dosage (mg / L) to the amount added is 1:1-1:3.

[0032] Additionally, feedback fine-tuning includes: the central controller will adjust COD 出水 With the preset COD 目标 The comparison is performed, and the following PID feedback control algorithm is executed: Hydrogen peroxide dosage feedback correction ΔM: ΔM = Kp1×(COD 出水 COD 目标 )+Ki1×∫(COD 出水 COD 目标 )dt; Where Kp1 and Ki1 are the proportional coefficient and integral coefficient in the PID feedback; Final hydrogen peroxide dosage M 最终 For feedforward quantity M 前馈 Sum of feedback corrections: M 最终 = M 前馈 + ΔM; The central controller is based on the residual H2O2 concentration M 出水 To constrain and control the amount of H2O2 added: if M 出水If the amount continuously exceeds the safety threshold, the final dosage will be automatically multiplied by a discount factor α (0.95) to gradually reduce the dosage and avoid waste.

[0033] pH coordinated control includes: the central controller converts the pH value of the effluent into a pH value. 出水 With the preset pH 目标 The comparison is performed, and the PID control algorithm is executed. Sulfuric acid dosage correction instruction: ΔP = Kp2 × (pH) 出水 - pH 目标 )+Ki2×∫(pH 出水 - pH 目标 )dt, through this command, dynamically adjust the speed of the first metering pump to maintain the reaction system at the optimal pH environment; Meanwhile, based on the pH gradient changes monitored in the three reaction zones, optimization and control suggestions were proposed.

[0034] The system is equipped with pH sensors in all three functional zones. By monitoring changes in pH gradient (the pH in the rapid mixing zone should be the lowest and most stable), the system can determine whether the acid addition system is functioning correctly and provide data support for the reaction environment. Specific adjustments are made according to the table below:

[0035] The main reactor COD effluent control includes: system monitoring of the COD concentration at the outlet of the main reaction zone. 主 The COD decrease rate V in the main reaction zone is calculated. When V decreases abnormally, it is considered an early signal of reaction obstruction. Based on this, the controller strengthens the regulation in advance, temporarily increases Kp, realizes "advanced regulation", and improves the system's anti-interference ability.

[0036] The reactor system of this invention has significantly enhanced resistance to shock loads. The multi-parameter, hierarchical intelligent control strategy enables the system to keenly sense and intelligently respond to internal and external changes, maintaining optimal system operation, making it particularly suitable for industrial wastewater treatment scenarios with large fluctuations in water quality and quantity.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A segmented reinforced Fenton reaction wastewater treatment reactor, the reactor is a cuboid structure, including a rapid mixing zone, a main reaction zone, and a maturation zone three functional zones, characterized in that, Wherein: The volume ratio of the rapid mixing zone is 10%~15%, the volume ratio of the main reaction zone is 60%~70%, the main reaction zone is provided with a stirrer with a stirring power of 0.5-1kW / m³, the volume ratio of the maturation zone is 15%~20%, the rapid mixing zone, the main reaction zone and the maturation zone are provided with stirrers with different stirring powers; the rapid mixing zone, the main reaction zone and the maturation zone are separated by vertical multi-hole distribution plates, the vertical multi-hole distribution plates are provided with holes with a size gradually increasing from top to bottom, and the hole diameter is determined according to the following formula: ； Wherein, Q is the water inflow (m³ / s), n is the number of openings (pcs), Cd is the flow coefficient of the opening, Hi is the static water pressure at the hole, g is the acceleration of gravity, and the value is 9.8 m / s²; the opening rate is controlled at 15%-25%.

2. The reactor for wastewater treatment by the enhanced Fenton reaction in sections according to claim 1, characterized in that: Fe is connected in the front region of the fast mixing zone 2+ A solution tank, an H2O2 solution tank, and in addition a sulfuric acid tank and a lye tank are connected.

3. The reactor for wastewater treatment by the enhanced Fenton's reaction in sections according to claim 1, characterized in that: It also includes a water inflow monitoring module, a water outflow monitoring module, a reactor process water quality monitoring module, and a central controller. The water inflow monitoring module is arranged on the water inflow pipeline of the pH adjusting tank and includes a first COD online monitor and a first pH online monitor. The water outflow monitoring module is arranged at the water outflow port of the maturation zone and includes a second COD online monitor, a second pH online monitor and a hydrogen peroxide concentration online monitor. The reactor process water quality monitoring module includes pH sensors arranged in the three functional zones respectively. The central controller is electrically connected with the water inflow monitoring module, the water outflow monitoring module, the reactor process water quality monitoring module and the metering pump, the central controller internally pre-stores a control program for receiving monitoring data and calculating and outputting control instructions for the metering pump.

4. A method for treating wastewater by a segmented reinforced Fenton reaction, characterized in that, The segmented Fenton reaction wastewater treatment reactor is used to perform the following steps: 1) The pH of the incoming water is adjusted to about 3.0~3.5 in advance; 2) After the influent enters the rapid mixing zone, Fe 2+ solution and H2O2 solution are added by metering pumps; in the rapid mixing zone, the wastewater and the reagents are mixed at a molecular level by a stirrer to rapidly start the Fenton reaction and maximize the initial generation rate of ·OH free radicals, and the hydraulic retention time is designed to be 1-3 min; 3) After the primary reaction in the rapid mixing zone, the mixed liquid flows through the vertical multi-hole distribution plate to the main reactor; the vertical multi-hole distribution plate disperses the water flow into multiple small and uniform jets to enter the main reaction zone, and the hydraulic retention time is 15~30min; 4) The mixed liquid in the main reactor is stirred by the stirrer to maintain the mass transfer efficiency and ensure that the Fenton reaction is fully reacted in the main reactor; 5) The water outflow from the main reactor flows through the vertical multi-hole distribution plate to the maturation zone; 6) The function of the maturation zone is to allow the Fenton reaction to end smoothly, promote the further oxidation of the residual pollutants and intermediate products in the Fenton reactor, and ensure that the Fenton reaction is completed; 7) The water outflow from the maturation zone is stored in the subsequent neutralization and sedimentation tank in the form of an overflow weir.

5. The method according to claim 4, wherein the method is characterized by: During the reaction process, the central controller completes five control processes, which are feedforward pre-control, feedback fine adjustment, pH coordination control, ferrous ion dosing linkage control and main reactor COD outflow control.

6. The method according to claim 5, wherein the method is characterized by, The feedforward pre-control comprises that the central controller receives the water inflow Q and the water inflow COD sent by the water inflow monitoring module, and calculates the feedforward dosage M of hydrogen peroxide according to a preset H2O2 / COD mass ratio 前馈 and the feedforward dosage N of Fe 2+ ; M 前馈 = k1×COD 进水 ×Q; Wherein, k1 is the feedforward coefficient, which is determined based on the H2O2 / COD ratio determined in the small test; Fe 2+ The value of the feedforward dosage N of Fe is determined according to the M feedforward linkage, to ensure that H2O2 and Fe 2+ The ratio of the dosage (mg / L) is 1:1-1:

3.

7. The method according to claim 5, wherein the method is characterized by, The feedback fine-tuning includes: the central controller compares the COD 出水 with the preset COD 目标 and executes the following PID feedback control algorithm: The feedback correction amount ΔM of the hydrogen peroxide dosage is: ΔM = Kp1x (COD 出水 - COD 目标 ) + Kix ∫ (COD 出水 - COD 目标 ) dt; Wherein, Kp1 and Ki1 are the proportional coefficient and integral coefficient in the PID feedback; Final hydrogen peroxide dosage M 最终 M = M 前馈 M = M 最终 M = M 前馈 M = M The central controller determines the residual H2O2 concentration M 出水 The H2O2 dosage is controlled: if M 出水 If M remains above the safety threshold, a discount factor α (0.95) is automatically applied to the final dosage, gradually reducing the dosage and avoiding waste.

8. The method according to claim 5, wherein the method is characterized by, The pH cooperative control comprises: a central controller compares the outlet water pH value with the preset pH value by using pH 出水 control algorithm, and executes PID control algorithm. 目标 control algorithm, and executes PID control algorithm. Sulfuric acid addition amount correction instruction: ΔP = Kp2x (pH 出水 - pH 目标 ) + Ki2x ∫ (pH 出水 - pH 目标 )dt, through which the rotation speed of the first metering pump is dynamically adjusted to maintain the reaction system in the optimal pH environment; Meanwhile, according to the gradient change of the pH values monitored in the three reaction zones, optimization and control suggestions are proposed.

9. The method according to claim 5, wherein the method is characterized by, The ferrous ion dosing linkage control includes: the central controller calculates the dosing amount of ferrous salt according to the final H2O2 / Fe 2+ molar ratio, and controls the metering pump to dose synchronously.

10. The method according to claim 5, wherein the method is characterized by, The main reactor COD effluent control includes: the system monitors the COD concentration COD of the main reaction zone outlet 主 and calculates the COD reduction rate V in the main reaction zone. When V abnormally decreases, it is considered as an early signal of reaction obstruction. The controller accordingly strengthens the adjustment in advance, temporarily increases Kp, realizes "advance adjustment", and improves the anti-interference ability of the system.

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