Method for removing organic impurities from hydrogen peroxide purification tower device

Abstract

The present invention relates to the field of sewage treatment technology, and discloses a method for removing organic impurities in a hydrogen peroxide purification tower device, wherein treated sewage is first subjected to dissolved air flotation treatment, polyaluminium chloride and polyacrylamide are added, microbubbles are generated by dissolved air pressure 0.3 0.4 MPa and reflux ratio 25% 35%, and the flotation outlet water enters the hydrogen peroxide purification tower, passes through a quartz sand layer and an activated carbon pre-adsorption layer, and the treated wastewater is introduced into the hydrogen peroxide purification tower, and modified chitosan and sodium thiosulfate are added synchronously. The present invention, by the dual-effect combination of modified chitosan and sodium thiosulfate, in the collaboration of a microfluidised catalyst, synchronously completes pollutant enhanced adsorption and dissolved oxygen rapid control, creates a low oxygen and efficient environment for subsequent oxidation reactions; in addition, a gradient reaction mechanism is achieved by combining sodium ferric ethylenediaminetetraacetic acid and polyethylene glycol in combination with a segmented dosing strategy, improving hydrogen peroxide utilization and strengthening the removal effect on refractory organic matter.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a method for removing organic impurities using a hydrogen peroxide purification tower device. Background Technology

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

[0003] However, traditional hydrogen peroxide is often added in a crude, segmented manner. This results in the hydrogen peroxide in the first stage decomposing due to excessively high local concentrations, and in the last stage, excess reagent due to reduced pollutant concentrations. Consequently, the collision efficiency between hydroxyl radicals and pollutants is low, leading to low removal rates of stubborn organic compounds such as nitrobenzene and aniline, making it difficult to meet stringent emission standards. Summary of the Invention

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

[0005] To achieve the above objectives, this application adopts the following technical solution: a method for removing organic impurities using a hydrogen peroxide purification tower device, comprising the following steps:

[0006] S1, Pre-adsorption and dissolved oxygen control:

[0007] The wastewater to be treated is first subjected to dissolved air flotation treatment, with the addition of polyaluminum chloride and polyacrylamide. Microbubbles are generated by dissolving air at a pressure of 0.3-0.4 MPa and a reflux ratio of 25%-35%. The flotation effluent enters a hydrogen peroxide purification tower, passing sequentially through a quartz sand layer and an activated carbon pre-adsorption layer. Subsequently, the wastewater is introduced into a 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 its adsorption capacity, while sodium thiosulfate reduces dissolved oxygen. An electromagnetic vibrator is activated to bring the catalyst into a microfluidic state, thus completing the adsorption of pollutants and control of dissolved oxygen.

[0008] S2, segmented gradient catalytic oxidation:

[0009] In the first stage of chemical addition, 40% of the total amount of hydrogen peroxide and sodium iron ethylenediaminetetraacetate 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. At the same time, nitrogen aeration is turned on to maintain a low-oxygen environment.

[0010] Intermediate dosing: Add 35% of the total amount of hydrogen peroxide and polyethylene glycol, and start mechanical stirring to promote the penetration of hydrogen peroxide and polyethylene glycol into the catalyst pores;

[0011] Final stage dosing: Add the remaining 25% hydrogen peroxide and the remaining sodium iron ethylenediaminetetraacetate, and use pulse aeration to impact the catalyst to release intermediate products;

[0012] S3, stable synergistic mass transfer via bubbles:

[0013] The hydrogen peroxide purification tower is equipped with a coaxial double sleeve. Nitrogen microbubbles are introduced through the coaxial double sleeve, and sodium dodecyl sulfate is injected simultaneously to inhibit bubble aggregation and enhance gas-liquid mass transfer efficiency.

[0014] S4, acidic vibration in-situ regeneration:

[0015] Acidic cleaning water containing citric acid is injected in reverse, while an electromagnetic vibrator is activated to weakly fluidize the catalyst, dissolve the surface iron sludge and restore the active sites, and then the regenerated wastewater is separated and discharged.

[0016] Preferably, the catalyst is composed of ferric oxide and activated carbon, with ferric oxide accounting for 20% of the total mass of the composite particles.

[0017] Preferably, in step 1, the mass ratio of modified chitosan to sodium thiosulfate is 1:1, and the following control conditions are met:

[0018] Modified chitosan has an amino modification rate of 25-35% and a molecular weight of 400,000-600,000. The dosage is calculated using the formula: ,in The dosage of modified chitosan is given in mg / L. The COD value of the raw water is used as the basis for dynamically adjusting the sodium thiosulfate dosage based on dissolved oxygen levels. ,in This refers to the dosage of sodium thiosulfate. Dissolved oxygen in raw water.

[0019] Preferably, in the segmented dosing operation of step 2, the hydrogen peroxide dosage accounts for 40% ± 2%, and sodium ferric ethylenediaminetetraacetate is added simultaneously, with the dosage meeting the following requirements. ,in This refers to the dosage of ferric sodium ethylenediaminetetraacetate. This is the amount of hydrogen peroxide added in this section; the hydrogen peroxide dosage is 35% ± 2%, and polyethylene glycol is added simultaneously at a fixed dosage of 10 mg / L;

[0020] Final stage: Hydrogen peroxide dosage accounts for 25% ± 2%, and the remaining 30% of the total ethylenediaminetetraacetic acid iron sodium is added simultaneously.

[0021] Preferably, in the bubble-stabilized synergistic mass transfer of step 3, the addition of sodium dodecyl sulfate is controlled in conjunction with the nitrogen flow rate, and the concentration of sodium dodecyl sulfate is calculated according to the formula: ,in This refers to the dosage of sodium dodecyl sulfate. The flow rate of nitrogen gas is expressed in units of... Nitrogen microbubble particle size controlled to The gas-liquid flow rate ratio is maintained through the coaxial double sleeve: ,in For liquid flow rate, The flow rate is the nitrogen gas flow rate.

[0022] Preferably, in step 4, the composition of the acidic washing water and the vibration parameters are adjusted according to the catalyst iron sludge loading, and the citric acid dosage is calculated according to the formula: ,in This refers to the dosage of citric acid. For the iron sludge content, the electromagnetic vibrator and amplitude must meet the following requirements: , ,in The vibration frequency, The amplitude is [value missing]. Preferably, a magnetic induction coil is embedded in the activated carbon pre-adsorption layer, causing ferric oxide and activated carbon to migrate directionally to areas with high pollutant concentrations under microfluidic conditions.

[0023] Preferably, the nitrogen aeration adopts a swirling jet mode, with the airflow forming a tangential angle with the tower wall. The catalyst reaction bed is stratified by centrifugation, with large catalyst particles moving outwards, and the single-pass gas volume V of the final pulse aeration is increased. P Controlled by formula: ,in Real-time wastewater flow rate at the end of the process. This represents the average COD removal rate.

[0024] Preferably, the coaxial double-tube has a spiral guide groove on its wall with a pitch of 10 mm and a groove depth of 2 mm to create turbulence in the liquid. A honeycomb rectifier is provided at the outlet end of the outer tube to separate nitrogen bubbles into homogeneous microbubble groups.

[0025] Preferably, the acidic 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 Pulsed nitrogen gas is activated to allow dissolved iron sludge to be expelled from the catalyst pores.

[0026] The technical effects and advantages of this invention are as follows: In this invention, the dual-effect combination of modified chitosan and sodium thiosulfate, under the synergy of microfluidic catalyst, simultaneously completes the enhanced adsorption of pollutants and rapid control of dissolved oxygen, creating a low-oxygen and high-efficiency environment for subsequent oxidation reactions; in addition, the combination of a segmented dosing strategy with sodium iron ethylenediaminetetraacetate and polyethylene glycol realizes a gradient reaction mechanism, improving the utilization rate of hydrogen peroxide and enhancing the removal effect on recalcitrant organic matter. Attached Figure Description

[0027] The disclosure of this 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 this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0028] Figure 1 This is a schematic diagram of the process for removing organic impurities using the hydrogen peroxide purification tower device of the present invention;

[0029] Figure 2 This is a process flow diagram of the present invention. Detailed Implementation

[0030] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0031] Example 1:

[0032] Reference Figure 1-Figure 2 As shown, the present invention provides a technical solution: a method for removing organic impurities using a hydrogen peroxide purification tower device, comprising the following steps:

[0033] S1, Pre-adsorption and dissolved oxygen control:

[0034] The wastewater to be treated is first subjected to dissolved air flotation treatment, with the addition of polyaluminum chloride and polyacrylamide. Microbubbles are generated by dissolving air at a pressure of 0.3 MPa and a reflux ratio of 25%. The flotation effluent enters a hydrogen peroxide purification tower and passes sequentially through a quartz sand layer and an activated carbon pre-adsorption layer. The activated carbon pre-adsorption layer has an embedded magnetic induction coil, which causes the iron oxide and activated carbon to migrate directionally to the high pollutant concentration area in a micro-fluidized state. Subsequently, the wastewater is 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 its adsorption capacity. At the same time, sodium thiosulfate reduces dissolved oxygen. An electromagnetic vibrator is activated to bring the catalyst into a micro-fluidized state, thus completing the adsorption of pollutants and control of dissolved oxygen.

[0035] The modified chitosan has an amino modification rate of 25% and a molecular weight of 400,000. The dosage is calculated according to the formula: ,in The dosage of modified chitosan is given in mg / L. The COD value of the raw water is used as the basis for dynamically adjusting the sodium thiosulfate dosage based on dissolved oxygen levels. ,in This refers to the dosage of sodium thiosulfate. Dissolved oxygen in raw water.

[0036] The catalyst is composed of iron oxide and activated carbon, with iron oxide accounting for 20% of the total mass of the composite particles.

[0037] S2, segmented gradient catalytic oxidation:

[0038] In the first stage of chemical addition, 40% of the total amount of hydrogen peroxide and sodium iron ethylenediaminetetraacetate 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. At the same time, nitrogen aeration is turned on to maintain a low-oxygen environment.

[0039] Intermediate dosing: Add 35% of the total amount of hydrogen peroxide and polyethylene glycol, and start mechanical stirring to promote the penetration of hydrogen peroxide and polyethylene glycol into the catalyst pores;

[0040] Final stage dosing: Add the remaining 25% hydrogen peroxide and the remaining ferric sodium ethylenediaminetetraacetate. Pulse aeration is used to impact the catalyst and release the intermediate product. In the staged dosing operation of step 2, the hydrogen peroxide dosage is 40% ± 2%, and ferric sodium ethylenediaminetetraacetate is added simultaneously. The dosage meets the following requirements: ,in This refers to the dosage of ferric sodium ethylenediaminetetraacetate. This is the amount of hydrogen peroxide added in this section; the hydrogen peroxide dosage is 35% ± 2%, and polyethylene glycol is added simultaneously at a fixed dosage of 10 mg / L;

[0041] Final stage: Hydrogen peroxide dosage accounts for 25% ± 2%, and the remaining 30% of the total ethylenediaminetetraacetic acid iron sodium is added simultaneously.

[0042] S3, stable synergistic mass transfer via bubbles:

[0043] The hydrogen peroxide purification tower is equipped with a coaxial double-sleeve pipe. The pipe wall of the coaxial double-sleeve pipe has spiral guide grooves with a pitch of 10mm and a groove depth of 2mm to create turbulent flow in the liquid. A honeycomb rectifier is installed at the outlet end of the outer pipe to separate nitrogen bubbles into homogeneous microbubble groups. Nitrogen microbubbles are introduced through the coaxial double-sleeve pipe, and the nitrogen aeration adopts a swirling jet mode with the airflow making a 45° angle with the tangential angle of the tower wall. The catalyst reaction bed is stratified by centrifugation, with large catalyst particles moving outwards, and the single-pass gas volume V of the final pulse aeration is increased. P Controlled by formula: ,in Real-time wastewater flow rate at the end of the process. To achieve the average COD removal rate, sodium dodecyl sulfate is injected simultaneously to suppress bubble aggregation and enhance gas-liquid mass transfer efficiency. In step 3, during bubble stabilization and synergistic mass transfer, the addition of sodium dodecyl sulfate is controlled in conjunction with the nitrogen flow rate. The concentration of sodium dodecyl sulfate is calculated using the following formula: ,in This refers to the dosage of sodium dodecyl sulfate. The flow rate of nitrogen gas is expressed in units of... Nitrogen microbubble particle size controlled to The gas-liquid flow rate ratio is maintained through the coaxial double sleeve: ,in For liquid flow rate, The flow rate is the nitrogen gas flow rate.

[0044] S4, acidic vibration in-situ regeneration:

[0045] Acidic cleaning water containing citric acid is injected in reverse, while an electromagnetic vibrator is activated to weakly fluidize the catalyst, dissolving surface iron sludge and restoring active sites. The regeneration wastewater is then separated and discharged. In step 4, during the in-situ acidic vibration regeneration, 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 using the following formula: ,in This refers to the dosage of citric acid. For the iron sludge content, the electromagnetic vibrator and amplitude must meet the following requirements: , ,in The vibration frequency, The amplitude is denoted as .

[0046] The acidic vibration in-situ regeneration also 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 Pulsed nitrogen gas is activated to allow dissolved iron sludge to be expelled from the catalyst pores.

[0047] Example 2:

[0048] Reference Figure 1-Figure 2 As shown, the present invention provides a technical solution: a method for removing organic impurities using a hydrogen peroxide purification tower device, comprising the following steps:

[0049] S1, Pre-adsorption and dissolved oxygen control:

[0050] The wastewater to be treated first undergoes dissolved air flotation treatment, with the addition of polyaluminum chloride and polyacrylamide. Microbubbles are generated by applying a dissolved air pressure of 0.4 MPa and a reflux ratio of 35%. The flotation effluent enters a hydrogen peroxide purification tower, passing 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 ferric oxide and activated carbon to migrate directionally to areas with high pollutant concentrations under microfluidic conditions. 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 its adsorption capacity, while sodium thiosulfate reduces dissolved oxygen. An electromagnetic vibrator is activated to bring the catalyst into a microfluidic state, completing pollutant adsorption and dissolved oxygen control. Increasing the dissolved air pressure and reflux ratio enhances the flotation treatment effect, more thoroughly removing oils and suspended solids. The modified chitosan with high amino modification rate and molecular weight further enhances the catalyst's adsorption capacity, rapidly reducing dissolved oxygen and creating better conditions for subsequent efficient oxidation reactions.

[0051] In step 1, the mass ratio of modified chitosan to sodium thiosulfate is 1:1, and the following control conditions are met:

[0052] The modified chitosan has an amino modification rate of 35% and a molecular weight of 600,000. The dosage is calculated according to the formula: ,in The dosage of modified chitosan is given in mg / L. The COD value of the raw water is used as the basis for dynamically adjusting the sodium thiosulfate dosage based on dissolved oxygen levels. ,in This refers to the dosage of sodium thiosulfate. This enhances the dissolved oxygen content of the raw water. Higher amino modification rates and molecular weights allow for a tighter bond between the modified chitosan and the catalyst surface, further strengthening its adsorption capacity. Dynamic addition of sodium thiosulfate ensures more precise dissolved oxygen control, providing a guarantee for the efficient treatment of complex water qualities.

[0053] The catalyst is composed of iron oxide and activated carbon, with iron oxide accounting for 20% of the total mass of the composite particles. Increasing the iron oxide loading enhances the catalytic activity of the catalyst, making it more suitable for the treatment of high-concentration organic wastewater. Under microfluidic conditions, its ability to decompose macromolecular organic matter is significantly enhanced.

[0054] S2, segmented gradient catalytic oxidation:

[0055] In the first stage of chemical addition, 40% of the total amount of hydrogen peroxide and sodium iron ethylenediaminetetraacetate 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. At the same time, nitrogen aeration is turned on to maintain a low-oxygen environment.

[0056] Intermediate dosing: Add 35% of the total amount of hydrogen peroxide and polyethylene glycol, and start mechanical stirring to promote the penetration of hydrogen peroxide and polyethylene glycol into the catalyst pores;

[0057] Final stage dosing: Add the remaining 25% hydrogen peroxide and the remaining sodium iron ethylenediaminetetraacetate. Pulse aeration is used to impact the catalyst to release intermediate products. The staged dosing strategy combined with different aeration methods achieves deep degradation of pollutants. The first stage rapidly oxidizes high-concentration organic matter, the middle stage enhances the penetration of the agent, and the final stage pulse aeration thoroughly releases intermediate products, improving the overall treatment effect. The stable reaction bed and low-oxygen environment ensure efficient utilization of hydrogen peroxide and reduce agent waste.

[0058] In step 2, during the segmented dosing operation, hydrogen peroxide is added at a rate of 40% ± 2%, and sodium ferric ethylenediaminetetraacetate is added simultaneously, with the dosage meeting the following requirements. ,in This refers to the dosage of ferric sodium ethylenediaminetetraacetate. This refers to the amount of hydrogen peroxide added in this section;

[0059] The hydrogen peroxide dosage was 35% ± 2%, and polyethylene glycol was added simultaneously at a fixed dosage of 10 mg / L.

[0060] Final stage: Hydrogen peroxide dosage accounts for 25% ± 2%, and the remaining 30% of the total ethylenediaminetetraacetic acid iron sodium is added simultaneously.

[0061] S3, stable synergistic mass transfer via bubbles:

[0062] The hydrogen peroxide purification tower is equipped with a coaxial double-sleeve pipe. The pipe wall of the coaxial double-sleeve pipe has spiral guide grooves with a pitch of 10mm and a groove depth of 2mm to create turbulent flow in the liquid. A honeycomb rectifier is installed at the outlet end of the outer pipe to separate nitrogen bubbles into homogeneous microbubble groups. Nitrogen microbubbles are introduced through the coaxial double-sleeve pipe, and the nitrogen aeration adopts a swirling jet mode, with the airflow forming a tangential angle with the tower wall. The catalyst reaction bed is stratified by centrifugation, with large catalyst particles moving outwards, and the single-pass gas volume V of the final pulse aeration is increased. P Controlled by formula: ,in Real-time wastewater flow rate at the end of the process. To achieve the average COD removal rate, sodium dodecyl sulfate is injected simultaneously to suppress bubble aggregation and enhance gas-liquid mass transfer efficiency. In step 3, during bubble stabilization and synergistic mass transfer, the addition of sodium dodecyl sulfate is controlled in conjunction with the nitrogen flow rate. The concentration of sodium dodecyl sulfate is calculated using the following formula: ,in This refers to the dosage of sodium dodecyl sulfate. The flow rate of nitrogen gas is expressed in units of... Nitrogen microbubble particle size controlled to The gas-liquid flow rate ratio is maintained through the coaxial double sleeve: ,in For liquid flow rate, To improve the nitrogen flow rate, the parameters of the spiral guide channel were optimized to further enhance the gas-liquid turbulence effect. Smaller microbubble particle size increased the mass transfer area, and sodium dodecyl sulfate stabilized the bubbles, significantly improving the gas-liquid mass transfer efficiency, promoting the generation of hydroxyl radicals, and accelerating the degradation rate of organic matter.

[0063] S4, acidic vibration in-situ regeneration:

[0064] Acidic cleaning water containing citric acid is injected in reverse, while an electromagnetic vibrator is activated to weakly fluidize the catalyst, dissolving surface iron sludge and restoring active sites. The regeneration wastewater is then separated and discharged. In step 4, during the in-situ acidic vibration regeneration, 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 using the following formula: ,in This refers to the dosage of citric acid. For the iron sludge content, the electromagnetic vibrator and amplitude must meet the following requirements: , ,in The vibration frequency, The amplitude is denoted as .

[0065] The acidic vibration in-situ regeneration also 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 The pulsed nitrogen gas is activated to remove dissolved iron sludge from the catalyst pores. The stronger acid cleaning and higher vibration parameters more thoroughly dissolve contaminants on the catalyst surface. Ascorbic acid accelerates the reduction of active sites, achieving efficient catalyst regeneration, extending catalyst life, reducing operating costs, and ensuring stable operation of the process under high load.

[0066] In summary, comparing the charts of Example 1 and Example 2, the differences in preprocessing are as follows:

[0067] Technical features Example 1 Example 2 Explanation of differences Dissolved air flotation parameters Dissolved gas pressure: 0.3 MPa; reflux ratio: 25%. Dissolved gas pressure: 0.4 MPa; reflux ratio: 35%. Example 2: Smaller microbubble particle size achieved 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, a 20% stronger hydrogen bonding force with the catalyst surface, and an adsorption site density increased to 1600 m² / g (compared to 1400 m² / g in Example 1). Sodium thiosulfate dosage Calculated based on sulfurized raw water Calculated based on sulfurized raw water If the DO concentration in the raw water is 7 mg / L, then in Example 1, 17.5 mg / L is added. In Example 2, the calculation is the same, and the values ​​are the same, but the modified chitosan has enhanced adsorption capacity.

[0068] Examples 1 and 2, through adjustments to pretreatment parameters, optimization of modifying reagents, and enhancement of the regeneration process, verified the adaptability and technical advantages of the present invention under different operating conditions:

[0069] Example 2 improved the oil removal efficiency of air flotation by increasing the dissolved air pressure and reflux ratio, combined with modified chitosan with high amino modification rate and molecular weight, and increased the catalyst adsorption sites by 20%, laying a cleaner water quality foundation for subsequent oxidation reactions.

[0070] Secondly, in Example 2, by enhancing the acid cleaning intensity, increasing the ascorbic acid dosage and vibration parameters, the iron sludge dissolution efficiency is improved. This invention can significantly improve the treatment efficiency of complex wastewater through dynamic adjustment of key parameters, and is especially suitable for scenarios with high concentrations of organic wastewater.

[0071] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A method for removing organic impurities using a hydrogen peroxide purification tower device, characterized in that, Includes the following steps: S1, Pre-adsorption and dissolved oxygen control: The wastewater to be treated is first treated by dissolved air flotation, with the addition of polyaluminum chloride and polyacrylamide. Microbubbles are generated by dissolving air at a pressure of 0.3-0.4 MPa and a reflux ratio of 25%-35%. The effluent from the air flotation enters the hydrogen peroxide purification tower and passes through a quartz sand layer and an activated carbon pre-adsorption layer in sequence. The wastewater is then introduced into the 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 its adsorption capacity. At the same time, sodium thiosulfate reduces dissolved oxygen. The electromagnetic vibrator is activated to make the catalyst in a microfluidic state, thus completing the adsorption of pollutants and control of dissolved oxygen. S2, segmented gradient catalytic oxidation: In the first stage of chemical addition, 40% of the total amount of hydrogen peroxide and sodium iron ethylenediaminetetraacetate 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. At the same time, nitrogen aeration is turned on to maintain a low-oxygen environment. Intermediate dosing: Add 35% of the total amount of hydrogen peroxide and polyethylene glycol, and start mechanical stirring to promote the penetration of hydrogen peroxide and polyethylene glycol into the catalyst pores; Final stage dosing: Add the remaining 25% hydrogen peroxide and the remaining sodium iron ethylenediaminetetraacetate, and use pulse aeration to impact the catalyst to release intermediate products; S3, stable synergistic mass transfer via bubbles: The hydrogen peroxide purification tower is equipped with a coaxial double sleeve. Nitrogen microbubbles are introduced through the coaxial double sleeve, and sodium dodecyl 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, while an electromagnetic vibrator is activated to weakly fluidize the catalyst, dissolve the surface iron sludge and restore the active sites, and then the regenerated wastewater is separated and discharged.

2. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: The catalyst is a granular catalyst formed by combining iron oxide and activated carbon, with iron oxide accounting for a certain percentage of the total mass of the granular catalyst. .

3. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: In step 1, the mass ratio of modified chitosan to sodium thiosulfate is 1:1, and the following control conditions are met: Modified chitosan has an amino modification rate of 25-35% and a molecular weight of 400,000-600,000. The dosage is calculated using the formula: ,in The dosage of modified chitosan is given in mg / L. The COD value of the raw water is used as the basis for dynamically adjusting the sodium thiosulfate dosage based on dissolved oxygen levels. ,in This refers to the dosage of sodium thiosulfate. Dissolved oxygen in raw water.

4. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: In the segmented dosing operation of step 2, the first stage of dosing involves adding hydrogen peroxide at a dosage of 40% ± 2%, along with simultaneous addition of sodium ferric ethylenediaminetetraacetate (EDTA), the dosage of which meets the following requirements. ,in This refers to the dosage of ferric sodium ethylenediaminetetraacetate. This refers to the amount of hydrogen peroxide added in this section; In the intermediate stage of chemical addition, hydrogen peroxide is added at a dosage of 35% ± 2%, and polyethylene glycol is added simultaneously at a fixed dosage of 10 mg / L. Final stage of dosing: Hydrogen peroxide dosage accounts for 25% ± 2%, and the remaining 30% of the total EDTA iron sodium is added simultaneously.

5. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: In step 3, during the bubble-stabilized synergistic mass transfer, the addition of sodium dodecyl sulfate is controlled in conjunction with the nitrogen flow rate. The concentration of sodium dodecyl sulfate is calculated using the following formula: ,in This refers to the dosage of sodium dodecyl sulfate. The flow rate of nitrogen gas is expressed in units of... Nitrogen microbubble particle size controlled to The gas-liquid flow rate ratio is maintained through the coaxial double sleeve: ,in For liquid flow rate, The flow rate is the nitrogen gas flow rate.

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

7. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: A magnetic induction coil is embedded in the activated carbon pre-adsorption layer, which causes ferric oxide and activated carbon to migrate directionally to the high pollutant concentration area under microfluidic conditions.

8. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: The nitrogen aeration adopts a swirling jet mode, with the airflow forming a tangential angle with the tower wall. The catalyst reaction bed is stratified by centrifugation, with large catalyst particles moving outwards, and the single-pass gas volume V of the final pulse aeration is increased. P Controlled by formula: ,in This refers to the real-time wastewater flow rate at the end of the process. This represents the average COD removal rate.

9. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: The coaxial double-tube has spiral guide grooves on its tube wall with a pitch of 10 mm and a groove depth of 2 mm to create turbulent flow in the liquid. A honeycomb rectifier is installed at the outlet end of the outer tube to separate nitrogen bubbles into homogeneous microbubble groups.

10. The method for removing organic impurities using the hydrogen peroxide purification tower device according to claim 1, characterized in that: The acidic vibration in-situ regeneration also 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 Pulsed nitrogen gas is activated to allow dissolved iron sludge to be expelled from the catalyst pores.

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