Method for removing organic impurities through hydrogen peroxide purification tower device

Abstract

The invention relates to the technical field of sewage treatment, and discloses a method for removing organic impurities by using a hydrogen peroxide purification tower device, which comprises the following steps: carrying out dissolved air flotation treatment on sewage to be treated, adding polyaluminum chloride and polyacrylamide, generating microbubbles under the conditions that the dissolved air pressure is 0.3-0.4 MPa and the reflux ratio is 25-35%, enabling air flotation effluent to enter a hydrogen peroxide purification tower, and removing the organic impurities by using the hydrogen peroxide purification tower device. Sequentially passing through a quartz sand layer and an activated carbon pre-adsorption layer, introducing the wastewater to be treated into the hydrogen peroxide purification tower, and synchronously adding modified chitosan and sodium thiosulfate. According to the invention, through double-effect combination of modified chitosan and sodium thiosulfate, under the cooperation of a microfluidization catalyst, enhanced adsorption of pollutants and rapid control of dissolved oxygen are synchronously completed, and a low-oxygen efficient environment is created for subsequent oxidation reaction; in addition, a gradient reaction mechanism is realized by combining a staged dosing strategy with ferric sodium ethylene diamine tetraacetate and polyethylene glycol, the utilization rate of hydrogen peroxide is increased, and the removal effect on refractory organic matters is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, in particular to a method for removing organic impurities using a hydrogen peroxide purification tower device. Background Art

[0002] In the treatment of high-concentration organic wastewater, catalytic oxidation processes using hydrogen peroxide as an oxidant have become one of the core technologies for removing difficult-to-degrade organic impurities due to their rapid reaction rate and wide range of applications. Existing hydrogen peroxide purification towers mostly use fixed-bed or fluidized-bed structures: a fixed bed forms a static reaction bed by loading catalyst, relying on contact between hydrogen peroxide and pollutants within the bed to achieve catalytic oxidation; a fluidized bed uses water or air flow to suspend catalyst particles, enhancing gas-liquid-solid three-phase mass transfer. Both types of devices generally adopt a staged dosing strategy for hydrogen peroxide, coupled with an aeration system to control dissolved oxygen, to inhibit the ineffective decomposition of hydrogen peroxide and promote the generation of hydroxyl radicals.

[0003] However, traditional hydrogen peroxide is mostly added in an extensive staged manner, resulting in self-decomposition of hydrogen peroxide in the first stage due to excessive local concentration, and excess reagent in the last stage due to reduced pollutant concentration, resulting in low collision efficiency between hydroxyl radicals and pollutants, and low removal rate of stubborn organic matter such as nitrobenzene and aniline, making it difficult to meet strict emission standards. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: To this end, we propose a method for removing organic impurities in a hydrogen peroxide purification tower device.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical solution: a method for removing organic impurities by a hydrogen peroxide purification tower device, comprising the following steps: S1, pre-adsorption and dissolved oxygen control: The wastewater to be treated is first treated by dissolved air flotation. Polyaluminium chloride and polyacrylamide are added to generate microbubbles at a dissolved air pressure of 0.3-0.4 MPa and a reflux ratio of 25%-35%. The flotation effluent enters a hydrogen peroxide purification tower, passing through a quartz sand layer and an activated carbon pre-adsorption layer in sequence. The wastewater is then introduced into a catalytic reaction zone, where modified chitosan and sodium thiosulfate are simultaneously added. The modified chitosan forms hydrogen bonds with the catalyst surface through amino groups to enhance adsorption capacity. At the same time, sodium thiosulfate reduces dissolved oxygen, and an electromagnetic vibrator is activated to microfluidize the catalyst, completing pollutant adsorption and dissolved oxygen control. S2, segmented gradient catalytic oxidation: In the first stage of dosing, 40% of the total amount of hydrogen peroxide and sodium ferric EDTA are added. The vibrator is turned off to stop the fluidization of the catalyst particles and allow them to accumulate to form a stable reaction bed. Nitrogen aeration is simultaneously turned on to maintain a low-oxygen environment. Dosing in the middle section: add 35% of the total amount of hydrogen peroxide and polyethylene glycol, start mechanical stirring to promote hydrogen peroxide and polyethylene glycol to penetrate the catalyst pores; Final dosing: add the remaining 25% of hydrogen peroxide and the remaining sodium ferric EDTA, and use pulse aeration to impact the catalyst to release the intermediate product; S3, Bubble-stabilized cooperative mass transfer: The hydrogen peroxide purification tower is equipped with coaxial double-tubes, through which nitrogen microbubbles are introduced, and sodium lauryl sulfate is injected simultaneously to inhibit bubble aggregation and enhance gas-liquid mass transfer efficiency; S4, acidic vibration in situ regeneration: Acidic cleaning water containing citric acid is injected in reverse, and the electromagnetic vibrator is started at the same time to make the catalyst weakly fluidized, dissolve the surface iron mud and restore the active sites, and the regenerated wastewater is separated and discharged.

[0006] Preferably, the catalyst is composed of ferroferric oxide and activated carbon, and the ferroferric oxide accounts for 20% of the total mass of the composite particles.

[0007] Preferably, in step 1, the mass ratio of the modified chitosan to sodium thiosulfate is 1:1, and the following control conditions are met: The amino modification rate of modified chitosan is 25-35%, the molecular weight is 400,000-600,000, and the dosage is calculated according to the formula: ,in is the dosage of modified chitosan mg / L, is the COD value of raw water, and the dosage of sodium thiosulfate is adjusted dynamically according to the dissolved oxygen ,in is the dosage of sodium thiosulfate, It is the dissolved oxygen in raw water.

[0008] Preferably, in the stepwise dosing operation of step 2, the amount of hydrogen peroxide added accounts for 40%±2%, and sodium ferric ethylenediaminetetraacetate is added simultaneously, and the amount of addition meets ,in is the dosage of sodium ferric EDTA, The dosage of hydrogen peroxide in this section accounts for 35%±2%, and polyethylene glycol is added simultaneously, with a fixed dosage of 10 mg / L. Final stage: The amount of hydrogen peroxide added accounts for 25%±2%, and the remaining sodium ferric EDTA added simultaneously accounts for 30% of the total amount.

[0009] Preferably, in the bubble-stabilized coordinated mass transfer in step 3, the addition of sodium lauryl sulfate is linked to the nitrogen flow rate, and the concentration of sodium lauryl sulfate is calculated according to the formula: ,in is the dosage of sodium lauryl sulfate, is the flow rate of nitrogen, in units of , the nitrogen microbubble particle size is controlled to , the gas-liquid flow rate ratio is maintained by the coaxial double-tube: ,in is the liquid flow rate, is the nitrogen flow rate.

[0010] Preferably, in the acidic vibration in-situ regeneration of step 4, the components of the acidic washing water and the vibration parameters are adjusted according to the catalyst iron mud loading, and the citric acid dosage is calculated according to the formula: ,in is the dosage of citric acid, For the iron sludge content, the electromagnetic vibrator and amplitude must meet the following requirements: , ,in is the vibration frequency, Preferably, a magnetic induction coil is embedded in the activated carbon pre-adsorption layer, so that the ferroferric oxide and the activated carbon can be directed to migrate to the area with high pollutant concentration in a microfluidized state.

[0011] Preferably, the nitrogen aeration adopts a swirl injection mode, and the tangential angle between the airflow and the tower wall is The catalyst bed is centrifugally layered, large catalyst particles are moved outward, and the single gas volume of the final pulse aeration is V P Control by formula: ,in is the real-time sewage flow at the end, is the average COD removal rate.

[0012] Preferably, the tube wall of the coaxial double-tube is provided with a spiral guide groove with a pitch of 10 mm and a groove depth of 2 mm to form turbulent flow of the liquid. A honeycomb rectifier is provided at the outlet end of the outer tube to divide the nitrogen bubbles into homogeneous microbubble groups.

[0013] Preferably, the acid vibration in-situ regeneration further comprises adding 5-8 mg / L ascorbic acid solution, turning off the vibrator and standing for 5 minutes to allow the catalyst surface to Restore to , turn on the pulse nitrogen to discharge the dissolved iron sludge from the catalyst pores.

[0014] The technical effects and advantages of the present invention are as follows: in the present invention, through the dual-effect combination of modified chitosan and sodium thiosulfate, in collaboration with a microfluidized catalyst, enhanced adsorption of pollutants and rapid control of dissolved oxygen are simultaneously achieved, creating a low-oxygen and high-efficiency environment for subsequent oxidation reactions; in addition, a segmented dosing strategy is combined with sodium ferric ethylenediaminetetraacetic acid and polyethylene glycol to achieve a gradient reaction mechanism, thereby improving the utilization rate of hydrogen peroxide and enhancing the removal effect of difficult-to-degrade organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The disclosure of the present invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. In the drawings, the same reference numerals are used to refer to the same components: Figure 1 This is a schematic diagram of the process of removing organic impurities in the hydrogen peroxide purification tower device of the present invention; Figure 2 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0016] It is easy to understand that according to the technical solution of the present invention, without changing the essential spirit of the present invention, a person skilled in the art can propose a variety of interchangeable structural modes and implementation modes. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of the present invention and should not be regarded as the entire invention or as a limitation or restriction of the technical solution of the present invention.

[0017] Example 1: Reference Figure 1-Figure 2 As shown, the present invention provides a technical solution: a method for removing organic impurities in a hydrogen peroxide purification tower device, comprising the following steps: S1, pre-adsorption and dissolved oxygen control: The wastewater to be treated is first subjected to dissolved air flotation treatment, and polyaluminum chloride and polyacrylamide are added. Microbubbles are generated by a dissolved air pressure of 0.3 MPa and a reflux ratio of 25%. The flotation effluent enters a hydrogen peroxide purification tower and passes through a quartz sand layer and an activated carbon pre-adsorption layer in sequence. A magnetic induction coil is embedded in the activated carbon pre-adsorption layer, causing ferroferric oxide and activated carbon to migrate directionally to areas with high pollutant concentrations under a microfluidized state. The wastewater is then introduced into a catalytic reaction zone, and modified chitosan and sodium thiosulfate are added simultaneously. The modified chitosan forms hydrogen bonds with the catalyst surface through amino groups to enhance adsorption capacity. At the same time, sodium thiosulfate reduces dissolved oxygen, and an electromagnetic vibrator is activated to cause the catalyst to be in a microfluidized state, completing pollutant adsorption and dissolved oxygen control. The amino modification rate of modified chitosan is 25%, the molecular weight is 400,000, and the dosage is calculated according to the formula: ,in is the dosage of modified chitosan mg / L, is the COD value of raw water, and the dosage of sodium thiosulfate is adjusted dynamically according to the dissolved oxygen ,in is the dosage of sodium thiosulfate, It is the dissolved oxygen in raw water.

[0018] The catalyst is composed of ferroferric oxide and activated carbon, and the ferroferric oxide accounts for 20% of the total mass of the composite particles.

[0019] S2, segmented gradient catalytic oxidation: In the first stage of dosing, 40% of the total amount of hydrogen peroxide and sodium ferric EDTA are added. The vibrator is turned off to stop the fluidization of the catalyst particles and allow them to accumulate to form a stable reaction bed. Nitrogen aeration is simultaneously turned on to maintain a low-oxygen environment. Dosing in the middle section: add 35% of the total amount of hydrogen peroxide and polyethylene glycol, start mechanical stirring to promote hydrogen peroxide and polyethylene glycol to penetrate the catalyst pores; Final dosing: add the remaining 25% of hydrogen peroxide and the remaining sodium iron EDTA, and use pulse aeration to impact the catalyst to release the intermediate product. In the segmented dosing operation of step 2, the amount of hydrogen peroxide added accounts for 40%±2%, and sodium iron EDTA is added simultaneously. The amount of addition meets the requirements. ,in is the dosage of sodium ferric EDTA, The dosage of hydrogen peroxide in this section accounts for 35%±2%, and polyethylene glycol is added simultaneously, with a fixed dosage of 10 mg / L. Final stage: The amount of hydrogen peroxide added accounts for 25%±2%, and the remaining sodium ferric EDTA added simultaneously accounts for 30% of the total amount.

[0020] S3, Bubble-stabilized cooperative mass transfer: The hydrogen peroxide purification tower device is equipped with a coaxial double-tube. The tube wall of the coaxial double-tube is provided with a spiral guide groove with a pitch of 10mm and a groove depth of 2mm to make the liquid form turbulence. A honeycomb rectifier is provided at the outlet end of the outer tube to divide the nitrogen bubbles into homogeneous microbubble groups. Nitrogen microbubbles are introduced through the coaxial double-tube. The nitrogen aeration adopts a swirl injection mode, and the airflow is tangentially angled with the tower wall at 45 The catalyst bed is centrifugally layered, large catalyst particles are moved outward, and the single gas volume of the final pulse aeration is V P Control by formula: ,in is the real-time sewage flow at the end, The average COD removal rate is calculated by injecting sodium lauryl sulfate simultaneously to suppress bubble coalescence and enhance gas-liquid mass transfer efficiency. In the bubble stable coordinated mass transfer in step 3, the addition of sodium lauryl sulfate is linked to the nitrogen flow rate, and the concentration of sodium lauryl sulfate is calculated according to the formula: ,in is the dosage of sodium lauryl sulfate, is the flow rate of nitrogen, in units of , the nitrogen microbubble particle size is controlled to , the gas-liquid flow rate ratio is maintained by the coaxial double-tube: ,in is the liquid flow rate, is the nitrogen flow rate.

[0021] S4, acidic vibration in situ regeneration: Inject acidic cleaning water containing citric acid in reverse, and start the electromagnetic vibrator to weakly fluidize the catalyst, dissolve the surface iron sludge and restore the active sites. The regeneration wastewater is separated and discharged. In the acidic vibration in-situ regeneration of step 4, the composition of the acidic cleaning water and the vibration parameters are adjusted according to the catalyst iron sludge loading. The citric acid dosage is calculated according to the formula: ,in is the dosage of citric acid, For the iron sludge content, the electromagnetic vibrator and amplitude must meet the following requirements: , ,in is the vibration frequency, is the amplitude.

[0022] The acid vibration in-situ regeneration further includes adding 5 mg / L ascorbic acid solution, turning off the vibrator and letting it stand for 5 minutes to allow the catalyst surface to Restore to , turn on the pulse nitrogen to discharge the dissolved iron sludge from the catalyst pores.

[0023] Example 2: Reference Figure 1-Figure 2 As shown, the present invention provides a technical solution: a method for removing organic impurities in a hydrogen peroxide purification tower device, comprising the following steps: S1, pre-adsorption and dissolved oxygen control: The wastewater to be treated is first treated by dissolved air flotation. Polyaluminium chloride and polyacrylamide are then added. Microbubbles are generated at a dissolved air pressure of 0.4 MPa and a reflux ratio of 35%. The flotation effluent enters a hydrogen peroxide purification tower, where it passes sequentially through a quartz sand layer and an activated carbon pre-adsorption layer. A magnetic induction coil is embedded in the activated carbon pre-adsorption layer, causing ferroferric oxide and activated carbon to migrate in a microfluidised state to areas of high pollutant concentration. The wastewater to be treated is then introduced into the hydrogen peroxide purification tower, where modified chitosan and sodium thiosulfate are simultaneously added. The modified chitosan forms hydrogen bonds with the catalyst surface through amino groups to enhance adsorption capacity. Simultaneously, the sodium thiosulfate reduces dissolved oxygen, and an electromagnetic vibrator is activated to microfluidise the catalyst, completing pollutant adsorption and dissolved oxygen control. Increasing the dissolved air pressure and reflux ratio enhances the flotation treatment effect and more thoroughly removes oil and suspended solids. The modified chitosan with a high amino modification rate and molecular weight further improves the catalyst's adsorption capacity, rapidly reducing dissolved oxygen and creating better conditions for subsequent efficient oxidation reactions.

[0024] In step 1, the mass ratio of the modified chitosan to sodium thiosulfate is 1:1, and the following control conditions are met: The amino modification rate of modified chitosan is 35%, the molecular weight is 600,000, and the dosage is calculated according to the formula: ,in is the dosage of modified chitosan mg / L, is the COD value of raw water, and the dosage of sodium thiosulfate is adjusted dynamically according to the dissolved oxygen ,in is the dosage of sodium thiosulfate, The higher amino modification rate and molecular weight allow the modified chitosan to bind more tightly to the catalyst surface, further enhancing adsorption capacity. Dynamic addition of sodium thiosulfate ensures more precise dissolved oxygen control, providing a guarantee for efficient treatment of complex water quality.

[0025] The catalyst is composed of a composite of ferroferric oxide and activated carbon, with the ferroferric oxide accounting for 20% of the total mass of the composite particles. Increasing the ferroferric oxide loading improves the catalytic activity of the catalyst, making it more suitable for the treatment of high-concentration organic wastewater, and significantly enhancing the ability to decompose large molecular organic matter under a microfluidized state.

[0026] S2, segmented gradient catalytic oxidation: In the first stage of dosing, 40% of the total amount of hydrogen peroxide and sodium ferric EDTA are added. The vibrator is turned off to stop the fluidization of the catalyst particles and allow them to accumulate to form a stable reaction bed. Nitrogen aeration is simultaneously turned on to maintain a low-oxygen environment. Dosing in the middle section: add 35% of the total amount of hydrogen peroxide and polyethylene glycol, start mechanical stirring to promote hydrogen peroxide and polyethylene glycol to penetrate the catalyst pores; Final dosing: Add the remaining 25% of hydrogen peroxide and the remaining sodium ferric EDTA, use pulse aeration to impact the catalyst to release intermediate products, and combine the segmented dosing strategy with different aeration methods to achieve deep degradation of pollutants. The first stage quickly oxidizes high-concentration organic matter, the middle stage strengthens the penetration of the agent, and the final stage pulse aeration completely releases the intermediate products, improving the overall treatment effect; stabilizing the reaction bed and the low-oxygen environment ensures efficient utilization of hydrogen peroxide and reduces agent waste.

[0027] In the step 2 dosing operation, the amount of hydrogen peroxide added is 40% ± 2%, and sodium ferric EDTA is added simultaneously, and the amount of addition meets the requirements. ,in is the dosage of sodium ferric EDTA, The amount of hydrogen peroxide added in this section; The dosage of hydrogen peroxide accounts for 35%±2%, and polyethylene glycol is added simultaneously, and its dosage is fixed at 10 mg / L; Final stage: The amount of hydrogen peroxide added accounts for 25%±2%, and the remaining sodium ferric EDTA added simultaneously accounts for 30% of the total amount.

[0028] S3, Bubble-stabilized cooperative mass transfer: The hydrogen peroxide purification tower device is provided with a coaxial double-tube. The tube wall of the coaxial double-tube is provided with a spiral guide groove with a pitch of 10mm and a groove depth of 2mm to make the liquid form turbulence. A honeycomb rectifier is provided at the outlet end of the outer tube to divide the nitrogen bubbles into homogeneous microbubble groups. Nitrogen microbubbles are introduced through the coaxial double-tube. The nitrogen aeration adopts a swirl injection mode, and the airflow is tangential to the tower wall at an angle of 1 / 4. The catalyst bed is centrifugally layered, large catalyst particles are moved outward, and the single gas volume of the final pulse aeration is V P Control by formula: ,in is the real-time sewage flow at the end, The average COD removal rate is calculated by injecting sodium lauryl sulfate simultaneously to suppress bubble coalescence and enhance gas-liquid mass transfer efficiency. In the bubble stable coordinated mass transfer in step 3, the addition of sodium lauryl sulfate is linked to the nitrogen flow rate, and the concentration of sodium lauryl sulfate is calculated according to the formula: ,in is the dosage of sodium lauryl sulfate, is the flow rate of nitrogen, in units of , the nitrogen microbubble particle size is controlled to , the gas-liquid flow rate ratio is maintained by the coaxial double-tube: ,in is the liquid flow rate, In order to improve the nitrogen flow rate, the spiral guide groove parameters are optimized to further enhance the gas-liquid turbulence effect. The smaller microbubble particle size increases the mass transfer area. Sodium lauryl sulfate stabilizes the bubbles, significantly improving the gas-liquid mass transfer efficiency, promoting the generation of hydroxyl free radicals, and accelerating the degradation rate of organic matter.

[0029] S4, acidic vibration in situ regeneration: Inject acidic cleaning water containing citric acid in reverse, and start the electromagnetic vibrator to weakly fluidize the catalyst, dissolve the surface iron sludge and restore the active sites. The regeneration wastewater is separated and discharged. In the acidic vibration in-situ regeneration of step 4, the composition of the acidic cleaning water and the vibration parameters are adjusted according to the catalyst iron sludge loading. The citric acid dosage is calculated according to the formula: ,in is the dosage of citric acid, For the iron sludge content, the electromagnetic vibrator and amplitude must meet the following requirements: , ,in is the vibration frequency, is the amplitude.

[0030] The acid vibration in-situ regeneration further includes adding 8 mg / L ascorbic acid solution, turning off the vibrator and letting it stand for 5 minutes to allow the catalyst surface to Restore to , turn on pulse nitrogen to discharge dissolved iron sludge from the catalyst pores, stronger acid cleaning and higher vibration parameters to more thoroughly dissolve pollutants on the catalyst surface, ascorbic acid accelerates the reduction of active sites, achieves efficient regeneration of the catalyst, extends the service life of the catalyst, reduces operating costs, and ensures stable operation of the process under high load.

[0031] In summary, the comparison chart of Example 1 and Example 2 shows the difference in pretreatment: Technical features Example 1 Example 2 Explanation of the differences Dissolved air flotation parameters Dissolved gas pressure 0.3MPa, reflux ratio 25% Dissolved gas pressure 0.4MPa, reflux ratio 35% Example 2: Microbubble size is smaller through higher pressure and reflux ratio Modified chitosan parameters Amino modification rate 25%, molecular weight 400,000 Amino modification rate 35%, molecular weight 600,000 The modified chitosan in Example 2 has a higher amino density, and its hydrogen bonding strength with the catalyst surface is enhanced by 20%, and the adsorption site is increased to 1600m² / g (1400m² / g in Example 1). Sodium thiosulfate dosage Calculated based on sulfide raw water Calculated based on sulfide raw water If the raw water DO is 7 mg / L, then 17.5 mg / L is added in Example 1. The same formula is used in Example 2 to calculate the same value, but the adsorption capacity of the modified chitosan is enhanced. Example 1 and Example 2 verify the adaptability and technical advantages of the present invention under different working conditions by adjusting pretreatment parameters, optimizing modification reagents, and strengthening the regeneration process: Example 2 improves the dissolved air pressure and reflux ratio, combines modified chitosan with high amino modification rate and molecular weight, and improves the flotation oil removal efficiency. The catalyst adsorption sites are increased by 20%, laying a foundation for cleaner water quality for subsequent oxidation reactions.

[0032] Secondly, Example 2 improves the iron sludge dissolution efficiency by increasing the acid cleaning intensity, the ascorbic acid dosage and the vibration parameters. The present invention can significantly improve the efficiency of complex wastewater treatment through dynamic adjustment of key parameters, and is particularly suitable for scenarios with high-concentration organic wastewater.

[0033] The technical scope of the present invention is not limited to the contents of the above description. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical idea of the present invention, and these deformations and modifications should all fall within the protection scope of the present invention.

Claims

1. A method for removing organic impurities using a hydrogen peroxide purification tower device, characterized in that: The following steps are involved: S1, pre-adsorption and dissolved oxygen control: The wastewater to be treated is first treated by dissolved air flotation, and polyaluminium chloride and polyacrylamide are added to generate microbubbles through the dissolved air pressure of 0.3-0.4MPa and the reflux ratio of 25%-35%. The flotation water enters the hydrogen peroxide purification tower and passes through the quartz sand layer and the activated carbon pre-adsorption layer in sequence; The wastewater is then introduced into the catalytic reaction zone, where modified chitosan and sodium thiosulfate are added simultaneously. The modified chitosan forms hydrogen bonds with the catalyst surface through amino groups to enhance adsorption capacity. At the same time, sodium thiosulfate reduces dissolved oxygen, and an electromagnetic vibrator is activated to microfluidize the catalyst, completing pollutant adsorption and dissolved oxygen control. S2, segmented gradient catalytic oxidation: In the first stage of dosing, 40% of the total amount of hydrogen peroxide and sodium ferric EDTA are added. The vibrator is turned off to stop the fluidization of the catalyst particles and allow them to accumulate to form a stable reaction bed. Nitrogen aeration is simultaneously turned on to maintain a low-oxygen environment. Dosing in the middle section: add 35% of the total amount of hydrogen peroxide and polyethylene glycol, start mechanical stirring to promote hydrogen peroxide and polyethylene glycol to penetrate the catalyst pores; Final dosing: add the remaining 25% of hydrogen peroxide and the remaining sodium ferric EDTA, and use pulse aeration to impact the catalyst to release the intermediate product; S3, Bubble-stabilized cooperative mass transfer: The hydrogen peroxide purification tower is equipped with coaxial double-tubes, through which nitrogen microbubbles are introduced, and sodium lauryl sulfate is injected simultaneously to inhibit bubble aggregation and enhance gas-liquid mass transfer efficiency; S4, acidic vibration in situ regeneration: Acidic cleaning water containing citric acid is injected in reverse, and the electromagnetic vibrator is started at the same time to make the catalyst weakly fluidized, dissolve the surface iron mud and restore the active sites, and the regenerated wastewater is separated and discharged.

2. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: The catalyst is composed of ferroferric oxide and activated carbon, and the ferroferric oxide accounts for 20% of the total mass of the composite particles.

3. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: In step 1, the mass ratio of the modified chitosan to sodium thiosulfate is 1:1, and the following control conditions are met: The amino modification rate of modified chitosan is 25-35%, the molecular weight is 400,000-600,000, and the dosage is calculated according to the formula: ,in is the dosage of modified chitosan mg / L, Raw water COD value, sodium thiosulfate dosage is adjusted dynamically according to dissolved oxygen ,in is the dosage of sodium thiosulfate, It is the dissolved oxygen in raw water.

4. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: In the step 2 dosing operation, the amount of hydrogen peroxide added is 40% ± 2%, and sodium ferric EDTA is added simultaneously, and the amount of addition meets the requirements. ,in is the dosage of sodium ferric EDTA, The dosage of hydrogen peroxide in this section accounts for 35%±2%, and polyethylene glycol is added simultaneously, with a fixed dosage of 10 mg / L. Final stage: The amount of hydrogen peroxide added accounts for 25%±2%, and the remaining sodium ferric EDTA added simultaneously accounts for 30% of the total amount.

5. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: In the bubble-stabilized coordinated mass transfer in step 3, the addition of sodium lauryl sulfate is linked to the nitrogen flow rate, and the concentration of sodium lauryl sulfate is calculated according to the formula: ,in is the dosage of sodium lauryl sulfate, is the flow rate of nitrogen, in units of , the nitrogen microbubble particle size is controlled to , the gas-liquid flow rate ratio is maintained by the coaxial double-tube: ,in is the liquid flow rate, is the nitrogen flow rate.

6. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: In the acidic vibration in-situ regeneration of step 4, the composition of the acidic cleaning water and the vibration parameters are adjusted according to the catalyst iron mud loading, and the citric acid dosage is calculated according to the formula: ,in is the dosage of citric acid, For the iron sludge content, the electromagnetic vibrator and amplitude must meet the following requirements: , ,in is the vibration frequency, is the amplitude.

7. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: A magnetic induction coil is embedded in the activated carbon pre-adsorption layer, so that the ferroferric oxide and the activated carbon can be directed to migrate to the area with high pollutant concentration in a microfluidized state.

8. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: The nitrogen aeration adopts a swirl injection mode, and the tangential angle between the airflow and the tower wall is The catalyst bed is centrifugally layered, large catalyst particles are moved outward, and the single gas volume of the final pulse aeration is V P Control by formula: ,in is the real-time sewage flow at the end, is the average COD removal rate.

9. The method for removing organic impurities from a hydrogen peroxide purification tower device according to claim 1, wherein: The tube wall of the coaxial double-tube is provided with a spiral guide groove with a pitch of 10 mm and a groove depth of 2 mm to form turbulent flow of the liquid. A honeycomb rectifier is provided at the outlet end of the outer tube to divide the nitrogen bubbles into homogeneous microbubble groups.

10. The method for removing organic impurities by a hydrogen peroxide purification tower device according to claim 1, wherein: The acid vibration in-situ regeneration further includes adding 5-8 mg / L ascorbic acid solution, turning off the vibrator and letting it stand for 5 minutes to allow the catalyst surface to Restore to , turn on the pulse nitrogen to discharge the dissolved iron sludge from the catalyst pores.

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