Wastewater oxidation treatment device capable of reducing iron ion solid waste amount

Abstract

The invention relates to a wastewater oxidation treatment device capable of reducing the solid waste amount of iron ions, and relates to the technical field of wastewater treatment.The wastewater oxidation treatment device comprises a supporting plate, and the top of the supporting plate is fixedly connected with a PH adjusting tank, a first-stage oxidation tank, a second-stage oxidation tank, a third-stage oxidation tank, an acid dissolving tank and an electrolytic tank. According to the present invention, by arranging the pH value adjusting tank, the purposes of wastewater storage and wastewater treatment can be achieved, by arranging the mechanical filter and the backwashing device, the quartz sand, the active carbon and other filtration materials in the mechanical filter can intercept the large particle suspended solids and the colloidal impurities in the wastewater, and the subsequent backwashing device performs reverse water injection through the sixth pipeline at regular intervals so as to achieve the wastewater treatment effect; according to the present invention, with the arrangement of the first-stage oxidation tank, the second-stage oxidation tank and the third-stage oxidation tank, the iron ion oxidation rate can be significantly improved and the unreacted iron ion residue can be reduced through the series connection design of the plurality of the oxidation tanks such as the first-stage oxidation tank, the second-stage oxidation tank and the third-stage oxidation tank.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment, and in particular to a wastewater oxidation treatment device that can reduce the amount of iron ion solid waste. Background Technology

[0002] In industrial wastewater treatment, the removal and resource utilization of iron ions has always been a key and challenging aspect of environmental protection. Traditional wastewater treatment processes often generate large amounts of difficult-to-treat iron ion solid waste during the removal of iron ions, which not only wastes resources but also poses a serious threat to the environment.

[0003] Regarding the aforementioned technologies, while existing wastewater oxidation treatment devices can convert ferrous ions into ferric ions and form precipitates through oxidation reactions when treating wastewater containing ferric ions, they suffer from numerous problems during actual operation, easily leading to the generation of large amounts of ferric ion solid waste. For example, insufficient oxidation reactions prevent some ferric ions from effectively precipitating, causing many inconveniences for users. Summary of the Invention

[0004] 1. Technical problems to be solved The purpose of this application is to provide a wastewater oxidation treatment device that can reduce the amount of iron ion solid waste, so as to solve the problem of low oxidation reaction efficiency.

[0005] The wastewater oxidation treatment device that can reduce the amount of iron ion solid waste provided in this application adopts the following technical solution: it includes a support plate, and the top of the support plate is fixedly connected to a pH adjustment tank, a primary oxidation tank, a secondary oxidation tank, a tertiary oxidation tank, an acid dissolution tank and an electrolytic tank. The top of the support plate is fixedly installed with a mechanical filter, a backwashing device, a disc centrifuge, a plate and frame filter press and a drying tower. A first pipe is fixedly connected to the side of the pH adjustment tank. The other end of the first pipe is fixedly connected to the top of the mechanical filter. A fourth pipe and a sixth pipe are fixedly connected to the surface of the mechanical filter. The other end of the sixth pipe is fixedly connected to the surface of the backwashing device. The other end of the fourth pipe is fixedly connected to the side of the primary oxidation tank. A seventh pipe is fixedly connected to the other side of the primary oxidation tank. The other end of the seventh pipe is fixedly connected to the side of the secondary oxidation tank. An eighth pipe is fixedly connected to the other side of the secondary oxidation tank. The other end of the eighth pipe is fixedly connected to the side of the tertiary oxidation tank. A second pipe is fixedly connected to the other side of the tertiary oxidation tank. The other end of the second pipe is fixedly connected to the top of the disc centrifuge. A fifth pipe is fixedly connected to the side of the acid dissolving tank, and the other end of the fifth pipe is fixedly connected to the side of the electrolytic cell. A third pipe is fixedly connected to the other side of the electrolytic cell, and the other end of the third pipe is located at the top of the drying tower. A discharge pipe is fixedly connected to the surface of the drying tower. By adopting the above technical solution, and by setting up a pH adjustment tank, the purpose of storing and treating wastewater can be achieved. By installing a mechanical filter and backwashing device, the filter media such as quartz sand and activated carbon in the mechanical filter can trap large suspended solids and colloidal impurities in the wastewater. The subsequent backwashing device periodically injects water in reverse through the sixth pipe to flush away impurities on the surface of the filter media, maintaining filtration accuracy and achieving automatic removal of large particles, preventing equipment blockage. By setting up a primary oxidation tank, a secondary oxidation tank, and a tertiary oxidation tank, multiple tanks connected in series can significantly improve the iron ion oxidation rate and reduce the residue of unreacted iron ions. By setting up an acid dissolution tank and an electrolysis tank, the acid dissolution tank can dissolve precipitates (via a disc). Iron ion solid waste (with low moisture content) separated by centrifuge and dehydrated by plate and frame filter press enters the acid dissolution tank. An appropriate amount of acidic solution (sulfuric acid) can be added externally to the tank to fully dissolve the solid waste, ultimately forming a high-concentration iron salt solution [sulfuric acid (H2SO4) is added to the acid dissolution tank to dissolve the iron ion solid waste (such as ferric hydroxide), generating an iron salt solution that can be used for electrolysis: Fe(OH)3 + 3H2SO4 → Fe2(SO4)3 + 6H2O (if the solid waste contains ferrous hydroxide, the reaction is: Fe(OH)2 + H2SO4 → FeSO4 + 2H2O)], facilitating subsequent electrolytic treatment. The iron is then reduced to metallic iron in the electrolytic cell for recovery. {The electrolytic cell applies a DC electric field to dissolve the Fe in the iron-containing solution.} 3+ or Fe 2+ At the cathode, reduction occurs to metallic iron, while at the anode, oxidation occurs. [1. Cathode reaction (reduction reaction) If the solution contains Fe...] 3+ Step 1: Fe 3+ +e - →Fe 2+ (Fe 3+ First reduced to Fe 2+ Step 2: Fe 2+ +2e - →Fe↓(Fe 2+ (Further reduced to metallic iron, precipitated at the cathode) If the solution contains Fe... 2+ (Direct reduction): Fe 2+ +2e - →Fe↓ (Metallic iron is directly deposited at the cathode)], [2. Anodic reaction (oxidation reaction) Water is oxidized at the anode, producing oxygen: 2H2O-4e - →O2↑+4H + [III. Overall Electrolysis Reaction] Combining the cathode and anodic reactions, the overall reaction is: 2Fe 3+ +3H₂O→2Fe↓+3 / 2O₂↑+6H +(Reaction conditions: DC power, electrode material is titanium-based lead dioxide anode and other inert electrodes)], finally the directional separation and recovery of iron ions are achieved through electrolysis, which significantly reduces the amount of iron ion solid waste generated and significantly improves the recovery rate of metallic iron, achieving the dual effect of "solid waste reduction and resource recovery". By setting up a disc centrifuge and a plate and frame filter press, since the two devices can be used in combination, the disc centrifuge quickly separates flocs through high-speed centrifugal force to form high-concentration sludge. Then, the nano-coated filter plates of the plate and frame filter press use hydrophobic and oleophilic properties to accelerate the permeation of filtrate and reduce filter cake adhesion, so as to further reduce the water content of sludge. By setting up a pretreatment stage (first pipe, fourth pipe, sixth pipe), an oxidation reaction stage (seventh pipe, eighth pipe), and a solid-liquid separation and recovery stage (second pipe, third pipe, fifth pipe and discharge pipe), the precise control of the entire material flow of wastewater, reagents, precipitates and other materials is achieved.

[0006] Preferably, a pH sensor is provided on one side of the pH adjustment tank, and an alkali pump and an acid pump are provided on the other side of the pH adjustment tank; By adopting the above technical solution, and by setting up a pH sensor, an alkali pump, and an acid pump, the pH sensor can monitor the acidity and alkalinity of the wastewater in real time. The PLC programmable controller can then link the acid or alkali pumps to adjust the wastewater pH to a suitable range, achieving precise pH control. The pH sensor collects the pH data of the wastewater in the tank in real time and transmits the data to the PLC programmable controller immediately. After receiving the data from the pH sensor, when the wastewater pH is lower than the preset value (acidic), the PLC programmable controller starts the alkali pump to add alkaline agents to the tank until the pH rises back to the target range. When the wastewater pH is higher than the preset value (alkaline), the PLC programmable controller starts the acid pump to add acidic agents to the tank until the pH drops to the target range. When the pH stabilizes within the preset range, the alkali and acid pumps automatically stop operating.

[0007] Preferably, a stirring device is fixedly installed inside the primary oxidation tank, secondary oxidation tank, and tertiary oxidation tank. By adopting the above technical solution and setting up the stirring device, the reactants can be mixed evenly, avoiding incomplete reaction caused by excessively high or low local concentrations. When wastewater enters the primary oxidation tank, secondary oxidation tank, or tertiary oxidation tank, the stirring device is activated, and the stirring blades are driven by a motor to rotate, continuously stirring the mixture of wastewater, oxidant, and reagents in the tank, so that the components can fully contact and mix evenly in the tank.

[0008] Preferably, an ultrasonic generator is fixedly installed on the top of the primary oxidation tank, an oxidant pump is provided on the side of the primary oxidation tank, an iron ion concentration sensor is provided on the top of the secondary oxidation tank, a dosing device is fixedly installed on the side of the secondary oxidation tank, an iron ion monitor is fixedly installed on the top of the tertiary oxidation tank, and a micro-dosing pump is provided on the side of the tertiary oxidation tank. By adopting the above technical solution and installing an ultrasonic generator, high-frequency ultrasonic waves (typically above 20kHz) can be emitted into the primary oxidation tank. The cavitation effect generated when the ultrasonic waves propagate in the liquid acts on pollutants in the wastewater for oxidation. When the ultrasonic waves propagate in the liquid, a large number of tiny bubbles (cavitation bubbles) are formed. These bubbles expand rapidly during the negative pressure phase of the sound wave and collapse sharply during the positive pressure phase. At the moment of bubble collapse, extremely high temperatures and pressures are generated locally, accompanied by strong shock waves and microjets. These extreme conditions can promote the breakage and decomposition of organic pollutant molecules in the wastewater, while accelerating the contact and reaction between the oxidant and the pollutants, especially enhancing the oxidation reaction involving iron ions. By installing an iron ion concentration sensor, the addition of iron catalyst in the secondary oxidation tank can be controlled. By installing an iron ion monitor, the addition of iron catalyst in the tertiary oxidation tank can be controlled. The ultimate purpose of detecting residual iron is to use an iron ion concentration sensor to collect real-time data on the iron ion concentration in the wastewater of the secondary oxidation tank and transmit the data to a PLC programmable controller. When the iron ion concentration is detected to be lower than the threshold required for the reaction, the PLC programmable controller controls the dosing device on the side of the secondary oxidation tank to automatically add iron-based catalysts to replenish the iron ions needed for the reaction. When the concentration is too high, the dosing device stops adding catalysts to prevent excessive iron ions from increasing the amount of solid waste. The iron ion monitor tracks the residual iron ion concentration in the tertiary oxidation tank in real time, and the data is synchronously fed back to the PLC programmable controller. If the concentration is still higher than the emission standard or recycling requirements, the PLC programmable controller starts the micro-dosing pump on the side of the tertiary oxidation tank to precisely add oxidant or regulator to promote the full reaction of the remaining iron ions with pollutants. If the concentration meets the standard, the dosing stops to ensure that the iron ions are efficiently utilized in the reaction and to reduce residues.

[0009] Preferably, solenoid valves are fixedly installed on the surfaces of the first pipe, the second pipe, the third pipe, the fourth pipe, the fifth pipe, the sixth pipe, the seventh pipe, the eighth pipe, and the discharge pipe; By adopting the above technical solution and setting up solenoid valves, the discharge volume in the first, second, third, fourth, fifth, sixth, seventh, and eighth pipelines and the discharge pipe can be adjusted, achieving the effects of "precise control, intelligent linkage, safety and reliability, and energy saving and low consumption".

[0010] Preferably, a support leg is fixedly connected to the bottom of the support plate, and a PLC programmable controller is fixedly installed on the side of the drying tower. By adopting the above technical solution, the supporting legs are used to support the entire device, and the PLC programmable controller is used to control the device's component flow.

[0011] Preferably, the pH adjustment tank, mechanical filter and backwashing device belong to the wastewater pretreatment unit stage, the primary oxidation tank, secondary oxidation tank and tertiary oxidation tank belong to the multi-stage oxidation reaction module stage, and the disc centrifuge, plate and frame filter press, acid dissolution tank, electrolytic cell and drying tower belong to the high-efficiency solid-liquid separation and recovery treatment module stage. By adopting the above technical solutions, the wastewater pretreatment unit stage can reduce the mixing of impurities; the multi-stage oxidation reaction module stage can achieve precise control of iron ion dosage using multiple sensors; and the efficient solid-liquid separation and recovery treatment module stage can achieve efficient extraction of iron resources.

[0012] Preferably, the filter plates of the plate and frame filter press are coated with a nano-coating, the acid dissolving tank is made of acid-resistant enamel, and the electrolytic cell is made of titanium-based lead dioxide anode. By adopting the above technical solutions and setting a nano-coating, the adhesion of iron sludge to the filter plate surface can be reduced, thus preventing sludge residue from clumping on the filter plate. By setting an acid-resistant enamel, the corrosion of the tank by the acidic environment can be prevented. By setting a titanium-based lead dioxide anode, which is made of lead dioxide coating, it has excellent conductivity, oxidation resistance and catalytic activity, thus improving the resource recovery effect.

[0013] 2. Beneficial effects In summary, this application includes at least one of the following beneficial technical effects: 1. This invention provides a wastewater oxidation treatment device that can reduce the amount of iron ion solid waste. By setting up a pH adjustment tank, it can store and treat wastewater. By setting up a mechanical filter and a backwashing device, the filter media such as quartz sand and activated carbon in the mechanical filter can trap large suspended solids and colloidal impurities in the wastewater. The subsequent backwashing device periodically injects water in reverse through a sixth pipe to flush impurities on the surface of the filter media, maintaining filtration accuracy and automatically removing large particulate impurities to prevent equipment blockage. By setting up a primary oxidation tank, a secondary oxidation tank, and a tertiary oxidation tank, multiple tanks can be connected in series to significantly improve the iron ion oxidation rate and reduce the residue of unreacted iron ions. By setting up an acid dissolution tank and an electrolysis tank, the acid dissolution... The precipitate, after being separated by a disc centrifuge and dehydrated by a plate and frame filter press (with low water content), enters the acid dissolution tank. An appropriate amount of acidic solution (sulfuric acid) can be added externally to the tank to fully dissolve the solid waste, ultimately forming a high-concentration iron salt solution [sulfuric acid (H2SO4) is added to the acid dissolution tank to dissolve the iron ion solid waste (such as ferric hydroxide), generating an iron salt solution suitable for electrolysis: Fe(OH)3 + 3H2SO4 → Fe2(SO4)3 + 6H2O (if the solid waste contains ferrous hydroxide, the reaction is: Fe(OH)2 + H2SO4 → FeSO4 + 2H2O)], facilitates subsequent electrolytic treatment. The iron is then reduced to metallic iron in the electrolytic cell for recovery [the electrolytic cell applies a DC electric field to the iron-containing solution to reduce the iron content in the solution]. 3+ or Fe 2+ At the cathode, reduction occurs to metallic iron, while at the anode, oxidation occurs. [1. Cathode reaction (reduction reaction) If the solution contains Fe...] 3+ Step 1: Fe 3+ +e - →Fe 2+ (Fe 3+ First reduced to Fe 2+ Step 2: Fe 2+ +2e - →Fe↓(Fe 2+ (Further reduced to metallic iron, precipitated at the cathode) If the solution contains Fe... 2+ (Direct reduction): Fe 2+ +2e - →Fe↓ (Metallic iron is directly deposited at the cathode)], [2. Anodic reaction (oxidation reaction) Water is oxidized at the anode, producing oxygen: 2H2O-4e - →O2↑+4H + [III. Overall Electrolysis Reaction] Combining the cathode and anodic reactions, the overall reaction is: 2Fe 3+ +3H₂O→2Fe↓+3 / 2O₂↑+6H +(Reaction conditions: DC power, electrode material is titanium-based lead dioxide anode and other inert electrodes)], finally the directional separation and recovery of iron ions are achieved through electrolysis, which significantly reduces the amount of iron ion solid waste generated and significantly improves the recovery rate of metallic iron, achieving the dual effect of "solid waste reduction and resource recovery". By setting up a disc centrifuge and a plate and frame filter press, since the two devices can be used in combination, the disc centrifuge quickly separates flocs through high-speed centrifugal force to form high-concentration sludge. Then, the nano-coated filter plates of the plate and frame filter press use hydrophobic and oleophilic properties to accelerate the permeation of filtrate and reduce filter cake adhesion, so as to further reduce the water content of sludge. By setting up a pretreatment stage (first pipe, fourth pipe, sixth pipe), an oxidation reaction stage (seventh pipe, eighth pipe), and a solid-liquid separation and recovery stage (second pipe, third pipe, fifth pipe and discharge pipe), the precise control of the entire material flow of wastewater, reagents, precipitates and other materials is achieved. Attached Figure Description

[0014] Figure 1 This is a front view schematic diagram of the overall physical structure of the present invention; Figure 2 This is a side view of the overall physical structure of the present invention; Figure 3 This is a top view schematic diagram of the overall physical structure of the present invention; Figure 4 This is a schematic diagram of the overall process structure of the present invention; Figure 5 This is a schematic diagram of the stage process structure of the wastewater pretreatment unit of the present invention; Figure 6 This is a schematic diagram of the multi-stage oxidation reaction module process structure of the present invention; Figure 7 This is a schematic diagram of the process structure of the efficient solid-liquid separation and recovery module of the present invention.

[0015] The components include: 1. Support plate; 2. pH adjustment tank; 3. Alkali pump; 4. Acid pump; 5. pH sensor; 6. First pipeline; 7. Mechanical filter; 8. Backwashing device; 9. Primary oxidation tank; 10. Secondary oxidation tank; 11. Tertiary oxidation tank; 12. Stirring device; 13. Second pipeline; 14. Disc centrifuge; 15. Plate and frame filter press; 16. Acid dissolution tank; 17. Electrolytic cell; 18. Third pipeline; 19. Drying tower; 20. Discharge pipe; 21. Support leg; 22. Fourth pipeline; 23. Fifth pipeline; 24. Ultrasonic generator; 25. Oxidant pump; 26. Iron ion concentration sensor; 27. Dosing device; 28. Iron ion monitor; 29. ​​Micro-dosing pump; 30. Sixth pipeline; 31. Seventh pipeline; 32. Eighth pipeline; 33. Solenoid valve; 34. PLC programmable controller. Detailed Implementation

[0016] The following is in conjunction with the appendix Figure 1 -Appendix Figure 7 This application will be described in further detail below.

[0017] Example 1: A wastewater oxidation treatment device that can reduce the amount of iron ion solid waste, referring to... Figure 1 , Figure 2 and Figure 3 The system includes a support plate 1, and the top of the support plate 1 is fixedly connected to a pH adjustment tank 2, a primary oxidation tank 9, a secondary oxidation tank 10, a tertiary oxidation tank 11, an acid dissolving tank 16, and an electrolytic cell 17. The top of the support plate 1 is also fixedly installed with a mechanical filter 7, a backwashing device 8, a disc centrifuge 14, a plate and frame filter press 15, and a drying tower 19. A first pipe 6 is fixedly connected to the side of the pH adjustment tank 2. The other end of the first pipe 6 is fixedly connected to the top of the mechanical filter 7. A fourth pipe 22 and a sixth pipe 30 are fixedly connected to the surface of the mechanical filter 7. The other end of the sixth pipe 30 is fixedly connected to the surface of the backwashing device 8. The other end of the fourth pipe 22 is fixedly connected to the side of the primary oxidation tank 9. A seventh pipe 31 is fixedly connected to the other side of the primary oxidation tank 9. The other end of the seventh pipe 31 is fixedly connected to the side of the secondary oxidation tank 10. An eighth pipe 32 is fixedly connected to the other side of the secondary oxidation tank 10. The other end of the eighth pipe 32 is fixedly connected to the side of the tertiary oxidation tank 11. A second pipe 13 is fixedly connected to the other side of the tertiary oxidation tank 11. The other end of the second pipe 13 is fixedly connected to the top of the disc centrifuge 14. A fifth pipe 23 is fixedly connected to the side of the acid dissolution tank 16. The other end of the fifth pipe 23 is fixedly connected to the side of the electrolytic cell 17. A third pipe 18 is fixedly connected to the other side of the electrolytic cell 17. The other end of the third pipe 18 is located at the top of the drying tower 19. A discharge pipe 20 is fixedly connected to the surface of the drying tower 19. By setting up a pH adjustment tank 2, the purpose of storing and treating wastewater can be achieved. By setting up a mechanical filter 7 and a backwashing device 8, the quartz sand, activated carbon and other filter media in the mechanical filter 7 can intercept large particulate suspended solids and colloidal impurities in the wastewater. Subsequently, the backwashing device 8 periodically injects water in reverse through the sixth pipe 30 to flush the impurities on the surface of the filter media, maintain the filtration accuracy, achieve automatic removal of large particulate impurities, and prevent equipment blockage. By setting up a primary oxidation tank 9, a secondary oxidation tank 10 and a tertiary oxidation tank 11, multiple series designs can be used to achieve a significant increase in the iron ion oxidation rate. To improve and reduce the residue of unreacted iron ions, an acid dissolution tank 16 and an electrolysis tank 17 are set up. The acid dissolution tank 16 dissolves the precipitate {iron ion solid waste (with low water content) separated by a disc centrifuge 14 and dehydrated by a plate and frame filter press 15, which enters the acid dissolution tank 16. An appropriate amount of acidic solution (sulfuric acid) can be added externally to the tank to fully dissolve the solid waste, ultimately forming a high-concentration iron salt solution [sulfuric acid (H2SO4) is added to the acid dissolution tank 16 to dissolve the iron ion solid waste (such as ferric hydroxide), generating an iron salt solution that can be used for electrolysis: Fe(OH)3 + 3H2SO4 → Fe2(SO4)3 + 6H2O (if the solid waste contains ferrous hydroxide, the reaction is: Fe(OH)2 + H2SO4 → FeSO4 + 2H2O)], facilitating subsequent electrolytic treatment}. The iron is then reduced to metallic iron in the electrolysis tank 17 for recovery {the electrolysis tank 17 applies a DC electric field to the iron-containing solution to reduce the iron content in the solution}. 3+ or Fe 2+ At the cathode, reduction occurs to metallic iron, while at the anode, oxidation occurs. [1. Cathode reaction (reduction reaction) If the solution contains Fe...] 3+ Step 1: Fe 3+ +e - →Fe 2+ (Fe 3+ First reduced to Fe 2+ Step 2: Fe 2+ +2e - →Fe↓(Fe 2+ (Further reduced to metallic iron, precipitated at the cathode) If the solution contains Fe... 2+ (Direct reduction): Fe 2+ +2e - →Fe↓ (Metallic iron is directly deposited at the cathode)], [2. Anodic reaction (oxidation reaction) Water is oxidized at the anode, producing oxygen: 2H2O-4e - →O2↑+4H +[III. Overall Electrolysis Reaction] Combining the cathode and anodic reactions, the overall reaction is: 2Fe 3+ +3H₂O→2Fe↓+3 / 2O₂↑+6H + (Reaction conditions: DC power, electrode material is titanium-based lead dioxide anode and other inert electrodes)], finally the directional separation and recovery of iron ions is achieved through electrolysis}, which significantly reduces the amount of iron ion solid waste generated and significantly improves the recovery rate of metallic iron, achieving the dual effect of "solid waste reduction and resource recovery". By setting up a disc centrifuge 14 and a plate and frame filter press 15, since the two devices can be used in combination, the disc centrifuge 14 quickly separates flocs through high-speed centrifugal force to form high-concentration sludge. Then, the nano-coated filter plate of the plate and frame filter press 15 uses hydrophobic and oleophilic properties to accelerate the permeation of filtrate and reduce filter cake adhesion, so as to further reduce the water content of sludge. By setting up a pretreatment stage (first pipe 6, fourth pipe 22, sixth pipe 30), an oxidation reaction stage (seventh pipe 31, eighth pipe 32), and a solid-liquid separation and recovery stage (second pipe 13, third pipe 18, fifth pipe 23 and discharge pipe 20), the precise control of the entire material flow of wastewater, reagents, precipitates and other materials is achieved.

[0018] Please see Figure 1 , Figure 3 , Figure 5 and Figure 6A pH sensor 5 is installed on one side of the pH adjustment tank 2, and an alkali pump 3 and an acid pump 4 are installed on the other side. By installing the pH sensor 5, alkali pump 3, and acid pump 4, the pH sensor 5 can monitor the acidity or alkalinity of the wastewater in real time. The PLC programmable controller 34 can then link the acid pump 4 or the alkali pump 3 to adjust the wastewater pH to a suitable range, achieving precise pH control. The pH sensor 5 collects the pH data of the wastewater in the tank in real time and transmits the data to the PLC programmable controller 34 immediately. After receiving the data from the pH sensor 5, when the wastewater pH is lower than the preset value (acidic), the PLC programmable controller 34 starts the alkali pump 3 to add alkaline agents to the tank until the pH rises back to the target range. When the pH value of the wastewater is higher than the preset value (alkaline), the PLC programmable controller 34 starts the acid pump 4 to add acidic agents to the tank until the pH value drops to the target range. When the pH value stabilizes within the preset range, the alkali pump 3 and the acid pump 4 automatically stop running. The primary oxidation tank 9, the secondary oxidation tank 10 and the tertiary oxidation tank 11 are all fixedly equipped with stirring devices 12. By setting the stirring devices 12, the reactants can be mixed evenly, avoiding incomplete reactions caused by excessively high or low local concentrations. When the wastewater enters the primary oxidation tank 9, the secondary oxidation tank 10 or the tertiary oxidation tank 11, the stirring device 12 is started. The stirring blades are driven by the motor to rotate, continuously stirring the mixture of wastewater, oxidant and agents in the tank, so that the components can fully contact and mix evenly in the tank.

[0019] Please see Figure 2 , Figure 3 and Figure 6An ultrasonic generator 24 is fixedly installed on the top of the primary oxidation tank 9, and an oxidant pump 25 is installed on the side of the primary oxidation tank 9. An iron ion concentration sensor 26 is installed on the top of the secondary oxidation tank 10, and a dosing device 27 is fixedly installed on the side of the secondary oxidation tank 10. An iron ion monitor 28 is fixedly installed on the top of the tertiary oxidation tank 11, and a micro-dosing pump 29 is installed on the side of the tertiary oxidation tank 11. By installing the ultrasonic generator 24, high-frequency ultrasonic waves (usually above 20kHz) can be emitted into the primary oxidation tank 9. The cavitation effect generated when the ultrasonic waves propagate in the liquid acts on the pollutants in the wastewater and achieves the purpose of oxidation. When the ultrasonic waves propagate in the liquid, a large number of tiny bubbles are formed. (Cavitation bubbles) These bubbles expand rapidly during the negative pressure phase of the sound wave and collapse abruptly during the positive pressure phase. The moment of bubble collapse generates extremely high temperatures and pressures locally, accompanied by strong shock waves and microjets. These extreme conditions promote the breakage and decomposition of organic pollutant molecules in wastewater, while accelerating the contact and reaction between the oxidant and pollutants, especially enhancing the oxidation reaction involving iron ions. By installing an iron ion concentration sensor 26, the addition of iron catalyst in the secondary oxidation tank can be controlled. By installing an iron ion monitor 28, the final iron residue in the tertiary oxidation tank can be detected. The iron ion concentration sensor 26 collects real-time data from the secondary oxidation tank 10 through its own detection. The system collects iron ion concentration data from the wastewater and transmits it to the PLC programmable controller 34. When the iron ion concentration is detected to be below the threshold required for the reaction, the PLC programmable controller 34 controls the dosing device 27 on the side of the secondary oxidation tank 10 to automatically add iron-based catalyst to replenish the iron ions required for the reaction. When the concentration is too high, the dosing device 27 stops adding catalyst to prevent excessive iron ions from increasing the amount of solid waste. The iron ion monitor 28 tracks the residual iron ion concentration in the tertiary oxidation tank 11 in real time, and the data is synchronously fed back to the PLC programmable controller 34. If the concentration is still higher than the emission standard or recycling requirements, the PLC programmable controller 34 starts the micro-dosing pump 29 on the side of the tertiary oxidation tank 11 to precisely add oxidant or adjust the concentration. The agent promotes the full reaction between residual iron ions and pollutants. If the concentration reaches the standard, the addition is stopped to ensure that the iron ions are efficiently utilized in the reaction and reduce residues. Solenoid valves 33 are fixedly installed on the surfaces of the first pipe 6, the second pipe 13, the third pipe 18, the fourth pipe 22, the fifth pipe 23, the sixth pipe 30, the seventh pipe 31, the eighth pipe 32 and the discharge pipe 20. By setting the solenoid valves 33, the discharge volume in the first pipe 6, the second pipe 13, the third pipe 18, the fourth pipe 22, the fifth pipe 23, the sixth pipe 30, the seventh pipe 31, the eighth pipe 32 and the discharge pipe 20 can be adjusted, achieving the effect of "precise control, intelligent linkage, safety and reliability and energy saving and low consumption".

[0020] Please see Figure 1 , Figure 3 , Figure 4 and Figure 7 Support legs 21 are fixedly connected to the bottom of support plate 1, and a PLC programmable controller 34 is fixedly installed on the side of drying tower 19. The support legs 21 provide support for the entire device, and the PLC programmable controller 34 controls the overall device's component flow. pH adjustment tank 2, mechanical filter 7, and backwashing device 8 belong to the wastewater pretreatment unit stage. Primary oxidation tank 9, secondary oxidation tank 10, and tertiary oxidation tank 11 belong to the multi-stage oxidation reaction module stage. Disc centrifuge 14, plate and frame filter press 15, acid dissolving tank 16, electrolytic cell 17, and drying tower 19 belong to the high-efficiency solid-liquid separation and recovery treatment module stage. By setting up the wastewater pretreatment unit stage, the purpose of reducing impurity contamination can be achieved. The multi-stage oxidation reaction module stage enables precise control of iron ion dosage using multiple sensors. The efficient solid-liquid separation and recovery module stage enables efficient extraction of iron resources. The filter plates of the plate and frame filter press 15 are coated with a nano-coating. The acid dissolution tank 16 is made of acid-resistant enamel, and the electrolytic tank 17 is made of titanium-based lead dioxide anode. The nano-coating reduces the adhesion of iron sludge to the filter plate surface, preventing sludge residue and agglomeration. The acid-resistant enamel prevents corrosion of the tank by the acidic environment. The titanium-based lead dioxide anode, made of lead dioxide coating, has excellent conductivity, oxidation resistance, and catalytic activity, improving the resource recovery effect.

[0021] The implementation principle of this application embodiment is as follows: First, iron-containing wastewater flows into pH adjustment tank 2. pH sensor 5 monitors the acidity and alkalinity of the wastewater in real time. When the pH value deviates from the set range, PLC programmable controller 34 commands acid pump 4 or alkali pump 3 to start, adding acidic or alkaline agents. After precipitation and mixing, the pH of the wastewater reaches the standard. Subsequently, the wastewater flows into mechanical filter 7 through first pipe 6. The double-layer filter media of quartz sand and activated carbon in mechanical filter 7 intercepts large particulate impurities. The purified wastewater is sent to primary oxidation tank 9 through fourth pipe 22. When the pressure difference between the inlet and outlet of mechanical filter 7 reaches the specified value, sixth pipe 30 connects to backwashing device 8 to rinse the filter media and ensure the filtration effect. Then, the wastewater entering the primary oxidation tank 9 is controlled by the PLC programmable controller 34 to add an appropriate amount of oxidant to the primary oxidation tank 9 via the oxidant pump 25. Afterwards, the ultrasonic generator 24 is activated, and the generated frequency (usually above 20kHz) creates a cavitation effect within the tank. During this effect, the ultrasonic waves propagate through the liquid, forming numerous tiny bubbles (cavitation bubbles). These bubbles rapidly expand under negative pressure and collapse rapidly under positive pressure. The collapse of these bubbles generates extremely high temperatures and pressures locally, accompanied by strong shock waves and microjets. These extreme conditions promote the breakage and decomposition of organic pollutant molecules in the wastewater. At this point, the oxidant and pollutants can be mixed by the stirring device 12 at the primary oxidation tank 9, accelerating the contact and reaction between the oxidant and pollutants, especially enhancing the oxidation reaction involving iron ions. After oxidation, the wastewater flows into the secondary oxidation tank 10 via the seventh pipe 31. Then, the PLC programmable controller 34 controls the iron ion concentration sensor 26 to monitor the concentration of iron ions in the wastewater. The data is fed back to the PLC programmable controller 34. When the iron ion concentration is detected to be lower than the threshold required for the reaction, the PLC programmable controller 34 controls the dosing device 27 on the side of the secondary oxidation tank 10 to automatically add iron-based catalyst to replenish the iron ions required for the reaction. When the concentration is too high, the dosing device 27 stops adding to avoid excessive iron ions leading to an increase in the amount of solid waste. The added iron-based catalyst can be stirred and mixed with the pollutants by the stirring device 12 at the secondary oxidation tank 10. After mixing, the wastewater enters the tertiary oxidation tank 11. The PLC programmable controller 34 instructs the iron ion monitor 28 to accurately detect the remaining iron ions, and the data is synchronously fed back to the PLC programmable controller 34. If the concentration is still higher than the emission standard or recycling requirements, the PLC programmable controller 34 starts the micro-dosing pump 29 on the side of the tertiary oxidation tank 11 to accurately add oxidant or regulator to promote the full reaction of the remaining iron ions and pollutants. If the concentration meets the standard, the addition stops. During the addition, the regulator and pollutants can be stirred and mixed by the stirring device 12 at the tertiary oxidation tank 11. Finally, the effluent from the tertiary oxidation tank 11 enters the disc centrifuge 14 through the second pipe 13. Under the set high-speed centrifugal force, sludge and coarse particle sediment within the specified solid content range are initially separated. The sludge then falls into the plate and frame filter press 15. The nano-coating on the surface of the filter plate reduces the adhesion of the filter cake due to its superhydrophobicity. Deep filtration is carried out under the specified pressure, reducing the moisture content of the filter cake to below the specified value. After the filtered sludge meets the standards, it can be discharged. The coarse particle sediment and the filter cake enter the acid dissolution tank 16 together. The acid-resistant enamel tank is used to dissolve the iron component in the sediment into an iron salt solution with sulfuric acid under the specified temperature range. The iron salt solution enters the electrolytic cell 17 through the fifth pipe 23. The titanium-based lead dioxide anode and stainless steel cathode reduce the iron ions to metallic iron with a purity of above the specified value under the specified current density range. The electrolyte is returned to the acid dissolution tank 16 for recycling through the third pipe 18. The insoluble matter after acid dissolution is sent to the drying tower 19 to be made into building material additives and discharged from the discharge pipe 20, thus realizing the resource utilization of solid waste.

[0022] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wastewater oxidation treatment device for reducing the amount of iron ion solid waste, comprising a support plate (1), characterized in that: The top of the support plate (1) is fixedly connected to a pH adjustment tank (2), a primary oxidation tank (9), a secondary oxidation tank (10), a tertiary oxidation tank (11), an acid dissolving tank (16), and an electrolytic cell (17). The top of the support plate (1) is fixedly installed with a mechanical filter (7), a backwashing device (8), a disc centrifuge (14), a plate and frame filter press (15), and a drying tower (19). The side of the pH adjustment tank (2) is fixedly connected to a first pipe (6), the other end of the first pipe (6) is fixedly connected to the top of the mechanical filter (7), the surface of the mechanical filter (7) is fixedly connected to a fourth pipe (22) and a sixth pipe (30), the other end of the sixth pipe (30) is fixedly connected to the surface of the backwashing device (8), the other end of the fourth pipe (22) is fixedly connected to the side of the primary oxidation tank (9), the other side of the primary oxidation tank (9) is fixedly connected to a seventh pipe (31), the other end of the seventh pipe (31) is fixedly connected to the side of the secondary oxidation tank (10), the other side of the secondary oxidation tank (10) is fixedly connected to an eighth pipe (32), the other end of the eighth pipe (32) is fixedly connected to the side of the tertiary oxidation tank (11), the other side of the tertiary oxidation tank (11) is fixedly connected to a second pipe (13), the other end of the second pipe (13) is fixedly connected to the top of the disc centrifuge (14); A fifth pipe (23) is fixedly connected to the side of the acid dissolving tank (16), and the other end of the fifth pipe (23) is fixedly connected to the side of the electrolytic cell (17). A third pipe (18) is fixedly connected to the other side of the electrolytic cell (17), and the other end of the third pipe (18) is located at the top of the drying tower (19). A discharge pipe (20) is fixedly connected to the surface of the drying tower (19).

2. The wastewater oxidation treatment device for reducing the amount of iron ion solid waste according to claim 1, characterized in that: A pH sensor (5) is provided on the side of the pH adjustment tank (2), and an alkali pump (3) and an acid pump (4) are provided on the other side of the pH adjustment tank (2).

3. The wastewater oxidation treatment device for reducing the amount of iron ion solid waste according to claim 1, characterized in that: A stirring device (12) is fixedly installed inside the primary oxidation tank (9), the secondary oxidation tank (10), and the tertiary oxidation tank (11).

4. The wastewater oxidation treatment device for reducing the amount of iron ion solid waste according to claim 1, characterized in that: An ultrasonic generator (24) is fixedly installed on the top of the primary oxidation tank (9), an oxidant pump (25) is provided on the side of the primary oxidation tank (9), an iron ion concentration sensor (26) is provided on the top of the secondary oxidation tank (10), a dosing device (27) is fixedly installed on the side of the secondary oxidation tank (10), an iron ion monitor (28) is fixedly installed on the top of the tertiary oxidation tank (11), and a micro-dosing pump (29) is provided on the side of the tertiary oxidation tank (11).

5. The wastewater oxidation treatment device for reducing the amount of iron ion solid waste according to claim 1, characterized in that: Solenoid valves (33) are fixedly installed on the surfaces of the first pipe (6), the second pipe (13), the third pipe (18), the fourth pipe (22), the fifth pipe (23), the sixth pipe (30), the seventh pipe (31), the eighth pipe (32), and the discharge pipe (20).

6. The wastewater oxidation treatment device for reducing the amount of iron ion solid waste according to claim 1, characterized in that: The bottom of the support plate (1) is fixedly connected to a support leg (21), and a PLC programmable controller (34) is fixedly installed on the side of the drying tower (19).

7. The wastewater oxidation treatment device for reducing the amount of iron ion solid waste according to claim 1, characterized in that: The pH adjustment tank (2), mechanical filter (7) and backwashing device (8) belong to the wastewater pretreatment unit stage. The primary oxidation tank (9), secondary oxidation tank (10) and tertiary oxidation tank (11) belong to the multi-stage oxidation reaction module stage. The disc centrifuge (14), plate and frame filter press (15), acid dissolution tank (16), electrolytic cell (17) and drying tower (19) belong to the high-efficiency solid-liquid separation and recovery treatment module stage.

8. The wastewater oxidation treatment device for reducing the amount of iron ion solid waste according to claim 1, characterized in that: The filter plate of the plate and frame filter press (15) is coated with a nano-coating, the acid dissolving tank (16) is made of acid-resistant enamel, and the electrolytic cell (17) is made of titanium-based lead dioxide anode.

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