Hydrogen peroxide multi-point addition reinforced iron-carbon Fenton reaction platform

Abstract

The utility model belongs to the field of wastewater treatment, and particularly relates to a hydrogen peroxide multi-point addition reinforced iron-carbon Fenton reaction platform. The reaction platform is composed of a wastewater channel, a wastewater sulfuric acid mixer, a sulfuric acid dosing device, an acid-water mixing PH meter, an acid-water mixing flowmeter, compressed air, an electrolytic tank, an electrolytic tank effluent PH meter, a hydrogen peroxide dosing device A, a one-step hydrogen peroxide flowmeter, a Fenton kettle A, a Fenton kettle B, a hydrogen peroxide dosing device B, a two-step hydrogen peroxide flowmeter, a Fenton kettle C, a Fenton kettle D and an electrolytic tank effluent PH meter. Iron-carbon micro-electrolysis is adopted in the micro-electrolysis stage of the platform, a micro-electrolysis filler generates 1.2 V potential difference under the condition that an external power source is not needed, countless primary battery systems in the equipment form a magnetic field after water is introduced into the system, and the micro-electrolysis filler is used for micro-electrolysis. Potential difference is generated to form micro-current to electrolyze the wastewater, so that the purpose of degrading organic pollution can be achieved.

Description

Technical Field

[0001] The utility model belongs to the field of wastewater treatment, and more specifically relates to a hydrogen peroxide multi-point dosing enhanced iron-carbon Fenton reaction platform. Background Art

[0002] With the continuous improvement of national strength, all walks of life in the country have been fully developed. The wastewater treatment of the dye intermediate industry has become a social concern. Generally, dye wastewater is treated by traditional Fenton, adsorption and biochemical methods. The traditional Fenton method has a high wastewater cost due to the large amount of iron sludge and the large amount of hydrogen peroxide waste; the adsorption method produces a large amount of hazardous waste, which needs to be disposed of; the biochemical method has a long wastewater disposal cycle and a long treatment process. Therefore, it is necessary to develop a hydrogen peroxide multi-point addition to strengthen the iron-carbon Fenton reaction platform, which can reduce the amount of Fenton reagent and reduce the economic cost. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a reaction platform for strengthening the iron-carbon Fenton reaction by adding hydrogen peroxide at multiple points.

[0004] The utility model adopts the following technical solutions to solve the above technical problems:

[0005] The reaction platform of the utility model comprises a wastewater channel, a wastewater sulfuric acid mixer, a sulfuric acid dosing device, an acid water mixed pH meter, an acid water mixed flow meter, compressed air, an electrolytic tank, an electrolytic tank outlet water pH meter, a hydrogen peroxide dosing device A, a one-step hydrogen peroxide flow meter, a Fenton kettle A, a Fenton kettle B, a hydrogen peroxide dosing device B, a two-step hydrogen peroxide flow meter, a Fenton kettle C, a Fenton kettle D, a composite alkali solution dosing device, a Fenton outlet water mixed pH meter, an outlet water buffer tank, a polydimethyldiallyl ammonium chloride solution dosing device, a polydimethyldiallyl ammonium chloride solution flow meter, a cationic polyacrylamide solution dosing device, a cationic polyacrylamide solution flow meter and a plate and frame filter press.

[0006] The wastewater channel is connected to the electrolytic tank via a sulfuric acid dosing device, a wastewater sulfuric acid mixer, an acid-water mixing pH meter, and an acid-water mixing flow meter, and the bottom of the electrolytic tank is connected to compressed air;

[0007] The electrolytic tank is connected to the Fenton reactor B through the electrolytic tank outlet water pH meter, the hydrogen peroxide dosing device A, the one-step hydrogen peroxide flow meter, and the Fenton reactor A;

[0008] The Fenton kettle B is connected to the Fenton kettle D via the hydrogen peroxide dosing device B, the two-step hydrogen peroxide flowmeter, and the Fenton kettle C;

[0009] The outlet pipe of Fenton reactor D is connected to the outlet buffer tank after passing through the composite alkali solution dosing device and the Fenton outlet mixed pH meter;

[0010] The outlet water buffer tank is connected to the pipeline of the polydimethyldiallyl ammonium chloride solution pumped out by the polydimethyldiallyl ammonium chloride solution dosing device, and a polydimethyldiallyl ammonium chloride solution flow meter is installed on the polydimethyldiallyl ammonium chloride solution dosing device; the outlet water buffer tank is connected to the pipeline of the cationic polyacrylamide solution pumped out by the cationic polyacrylamide solution dosing device, and a cationic polyacrylamide solution flow meter is installed at the rear end of the cationic polyacrylamide solution dosing device;

[0011] The outlet end of the water outlet buffer tank is connected to the plate and frame filter press.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The micro-electrolysis stage of this platform adopts iron-carbon micro-electrolysis, in which the core is iron-carbon filler. Micro-electrolysis filler is an ideal process for treating high-concentration, difficult-to-degrade organic wastewater, also known as internal electrolysis. Micro-electrolysis filler generates a 1.2 volt potential difference without an external power supply. After the system is connected to water, the countless primary battery systems in the equipment form a magnetic field, generating a potential difference to form a micro-current to electrolyze the wastewater, which can achieve the purpose of degrading organic pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the process of a hydrogen peroxide multi-point dosing enhanced iron-carbon Fenton reaction platform.

[0015] In the attached figure: M01 wastewater, M02 wastewater sulfuric acid mixer, M03 sulfuric acid dosing device, M04 acid water mixing pH meter, M05 acid water mixing flowmeter, M06 compressed air, M07 electrolysis tank, M08 electrolysis tank outlet water pH meter, M09 hydrogen peroxide dosing device A, M10 one-step hydrogen peroxide flowmeter, M11 Fenton reactor A, M12 Fenton reactor B, M13 hydrogen peroxide dosing device B, M14 two-step hydrogen peroxide flowmeter M15 Fenton reactor C, M16 Fenton reactor D, M17 composite alkali solution dosing device, M18 Fenton outlet water mixing pH meter M19 outlet water buffer tank, M20 polydimethyldiallyl ammonium chloride solution dosing device, M21 polydimethyldiallyl ammonium chloride solution flowmeter, M22 cationic polyacrylamide solution dosing device M23 cationic polyacrylamide solution flowmeter, M24 Plate and frame filter press. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with specific embodiments.

[0017] As attached Figure 1As shown, the reaction platform consists of a wastewater channel M01, a wastewater sulfuric acid mixer M02, a sulfuric acid dosing device M03, an acid-water mixing pH meter M04, an acid-water mixing flow meter M05, compressed air M06, an electrolysis tank M07, an electrolysis tank outlet pH meter M08, a hydrogen peroxide dosing device AM09, a one-step hydrogen peroxide flow meter M10, a Fenton reactor AM11, a Fenton reactor BM12, a hydrogen peroxide dosing device BM13, a two-step hydrogen peroxide flow meter M14, a Fenton reactor CM15, a Fenton reactor DM16, a composite alkali solution dosing device M17, a Fenton outlet mixing pH meter M18, an outlet buffer tank M19, a polydimethyldiallylammonium chloride solution dosing device M20, a polydimethyldiallylammonium chloride solution flow meter M21, a cationic polyacrylamide solution dosing device M22, a cationic polyacrylamide solution flow meter M23 and a plate and frame filter press M24.

[0018] The wastewater is mixed with sulfuric acid pumped out of the sulfuric acid dosing device M03 through the wastewater pipe M01 and the wastewater sulfuric acid mixer M02, and then detected by the acid water mixing pH meter M04, and the water flow rate is measured by the acid water mixing flow meter M05, and then enters the electrolytic tank M07 for micro-electrolysis, and compressed air M06 is introduced into the bottom of the electrolytic tank M07 to aerate the wastewater;

[0019] An electrolysis tank outlet pH meter M08 is installed on the micro-electrolysis outlet pipe. After the electrolysis tank outlet pH meter M08, the wastewater is connected to the one-step hydrogen peroxide. The one-step hydrogen peroxide is pumped in through the hydrogen peroxide dosing device AM09. After the hydrogen peroxide dosing device AM09, a one-step hydrogen peroxide flowmeter M10 is installed to measure the amount of hydrogen peroxide added. After the wastewater is mixed with the one-step hydrogen peroxide, it enters the Fenton reactor AM11. The outlet water of the Fenton reactor AM11 enters the Fenton reactor BM12.

[0020] The outlet water of Fenton reactor BM12 is connected to the second-step hydrogen peroxide, which is pumped in through the hydrogen peroxide dosing device BM13. The hydrogen peroxide dosing device BM13 is connected to the second-step hydrogen peroxide flowmeter M14. The outlet water of Fenton reactor BM12 is connected to the second-step hydrogen peroxide and mixed, and then enters Fenton reactor CM15. The outlet water of Fenton reactor CM15 enters Fenton reactor DM16.

[0021] The outlet pipe of Fenton reactor DM16 is connected to the compound alkali solution pumped out by compound alkali solution dosing device M17. The outlet water of Fenton reactor DM16 is mixed with the compound alkali solution and tested by Fenton outlet water mixing pH meter M18 before entering the outlet water buffer tank M19.

[0022] The outlet buffer tank M19 is connected to a pipeline of a polydimethyldiallyl ammonium chloride solution pumped out by a polydimethyldiallyl ammonium chloride solution dosing device M20, and a polydimethyldiallyl ammonium chloride solution flowmeter M21 is installed in the polydimethyldiallyl ammonium chloride solution dosing device M20; at the same time, the outlet buffer tank M19 is also connected to a pipeline of a cationic polyacrylamide solution pumped out by a cationic polyacrylamide solution dosing device M22, and a cationic polyacrylamide solution flowmeter M23 is installed after the cationic polyacrylamide solution dosing device M22;

[0023] The effluent from the effluent buffer tank M19 enters the plate and frame filter press M24 for mud and water separation.

[0024] How to use this platform:

[0025] Iron-carbon micro-electrolysis is used in the micro-electrolysis stage, in which the core is iron-carbon filler. Micro-electrolysis filler is an ideal process for treating high-concentration, difficult-to-degrade organic wastewater, also known as internal electrolysis. Micro-electrolysis filler generates a 1.2 volt potential difference without an external power supply. After the system is connected to water, the countless primary battery systems in the equipment form a magnetic field, generating a potential difference to form a micro-current to electrolyze the wastewater, which can achieve the purpose of degrading organic pollution.

[0026] The iron-carbon adopts pressed porous iron-carbon balls, which have large specific surface area and sufficient micro-electrolysis. At the same time, the electrolysis tank adopts a micro-aeration device.

[0027] Technical parameters of iron carbon balls

[0028] Specific gravity: 1.0 ton / m³, specific surface area: 1.2 ㎡ / g, porosity: 65%, physical strength: ≧1000KG / C㎡.

[0029] Product specifications: flat round

[0030] Composition: iron ore concentrate 80%, carbon 15%, catalyst 2%, activator 3%

[0031] Fenton stage

[0032] After the wastewater is mixed with sulfuric acid through a pipeline mixer, it enters the iron carbon tank for sufficient aeration treatment. The online pH meter is used to detect the effluent value and feed back the price adjustment and acid adding device to ensure that the effluent pH value is between 3-4. This ensures that there is sufficient divalent iron ion Fe2+ in the wastewater after it leaves the iron carbon tank. The divalent iron ion Fe2+ reacts with hydrogen peroxide in an acidic environment to undergo Fenton reaction. A large amount of hydroxyl free radicals •OH are produced during the overcharge of the Fenton reaction. The hydroxyl free radicals •OH are highly oxidizing and attack organic matter to reduce and eliminate the COD of the wastewater.

[0033] The addition of hydrogen peroxide is carried out in two steps. The hydrogen peroxide feed rate is linked to the inlet flow rate of the Fenton stage. The wastewater flow rate is numerically fed back to adjust the hydrogen peroxide dosing pump. The wastewater inlet flow rate is controlled to 25m³ / h. The amount of hydrogen peroxide added in the first step is 0.2%-0.33% of the inlet flow rate; the amount of hydrogen peroxide added in the second step is 0.1%-0.67% of the inlet flow rate.

[0034] After the two-step Fenton is completed, the composite alkali solution is added to adjust the effluent pH to 9-9.5, and the effluent online pH value feedback is used to adjust the dosing device to control the dosage; 1% polydimethyldiallyl ammonium chloride aqueous solution 100-110L / h and 1‰ cationic polyacrylamide solution 40-50L / h are quantitatively added, and the effluent is filtered through a filter press. For nitroaniline wastewater, the water quality can be reduced from COD 1000-1500mg / L to COD 90-150mg / L after treatment;

[0035] The loss of customized iron-carbon balls is reduced by more than 60% compared with traditional iron-carbon fillers, and the amount of sludge generated by treatment is reduced by 50%; the step-by-step addition of hydrogen peroxide ensures that the utilization rate of hydrogen peroxide increases by more than 15%.

[0036] The reaction steps are as follows:

[0037] S1 Micro-electrolysis water inlet

[0038] Wastewater M01 is mixed with sulfuric acid provided by sulfuric acid dosing device M03 through pipeline mixer M02 and then enters electrolytic tank M07. Compressed air M06 is introduced into the electrolytic tank for aeration. To ensure that the iron carbon is fully in contact with the wastewater, the water inlet pipeline is equipped with a water inlet flow meter M05, and the water inlet flow rate is controlled at 22-25m³ / h; an online pH meter M04 is installed after the water inlet pipeline mixer, and the pH value is controlled to 2-3;

[0039] S2 Micro-electrolysis water

[0040] The micro-electrolysis water outlet pipe is equipped with an online pH meter M09, and the pH value of the outlet water is controlled to 3-4;

[0041] S3 Fenton one-step with hydrogen peroxide

[0042] The effluent from micro-electrolysis enters the M11 Fenton reactor A, and the proportion of hydrogen peroxide dosing is controlled to be 0.2%-0.33% of the inlet flow rate through the M09 hydrogen peroxide dosing device A and the M10 one-step hydrogen peroxide flowmeter. The wastewater enters the M12 Fenton reactor B from the M11 Fenton reactor A and continues to undergo Fenton reaction;

[0043] S4 Fenton two-step plus hydrogen peroxide

[0044] The proportion of hydrogen peroxide dosing is controlled to be 0.1%-0.67% of the inlet flow rate through the hydrogen peroxide dosing device B M13 and the two-step hydrogen peroxide flowmeter B M14. The wastewater enters the M16 Fenton reactor D from the M15 Fenton reactor C and continues to undergo Fenton reaction.

[0045] S5 Neutralization

[0046] Use M17 compound alkali solution dosing device to add compound alkali solution to the outlet pipe of M16 Fenton reactor D. An online pH meter M18 is set downstream of the pipe, and the pH value is controlled to 9-9.5;

[0047] S6 Flocculation

[0048] The wastewater enters the effluent buffer tank M19 for flocculation operation.

[0049] The polydimethyldiallylammonium chloride solution dosing device M20 is used to quantitatively add 1% polydimethyldiallylammonium chloride solution. The dosing pipeline is equipped with a flow meter M21. The input amount is 100-110L / h.

[0050] A cationic polyacrylamide solution with a concentration of 1‰ is quantitatively added through a cationic polyacrylamide solution dosing device M22, and a flow meter M23 is provided in the dosing pipeline, and the input amount is 40-50L / h;

[0051] S7 filter press

[0052] The flocculated solution is filtered through filter press M24 to achieve mud-water separation and sewage purification.

Claims

1. A hydrogen peroxide multi-point dosing enhanced iron-carbon Fenton reaction platform, It is characterized in that The reaction platform includes a wastewater channel (M01), a wastewater sulfuric acid mixer (M02), a sulfuric acid dosing device (M03), an acid water mixing pH meter (M04), an acid water mixing flow meter (M05), compressed air (M06), an electrolysis tank (M07), an electrolysis tank outlet water pH meter (M08), a hydrogen peroxide dosing device A (M09), a one-step hydrogen peroxide flow meter (M10), a Fenton kettle A (M11), a Fenton kettle B (M12), a hydrogen peroxide dosing device B (M13), a two-step hydrogen peroxide dosing device Oxygen water flow meter (M14), Fenton reactor C (M15), Fenton reactor D (M16), compound alkali solution dosing device (M17), Fenton effluent mixed pH meter (M18), effluent buffer tank (M19), polydimethyldiallyl ammonium chloride solution dosing device (M20), polydimethyldiallyl ammonium chloride solution flow meter (M21), cationic polyacrylamide solution dosing device (M22), cationic polyacrylamide solution flow meter (M23) and plate and frame filter press (M24), The wastewater channel (M01) is connected to the electrolytic tank (M07) via the sulfuric acid dosing device (M03), the wastewater sulfuric acid mixer (M02), the acid-water mixing pH meter (M04), and the acid-water mixing flow meter (M05), and the bottom of the electrolytic tank (M07) is connected to the compressed air (M06); The electrolytic tank (M07) is connected to the Fenton tank B (M12) through the electrolytic tank outlet water pH meter (M08), the hydrogen peroxide dosing device A (M09), the one-step hydrogen peroxide flow meter (M10), and the Fenton tank A (M11); The Fenton reactor B (M12) is connected to the Fenton reactor D (M16) via the hydrogen peroxide dosing device B (M13), the two-step hydrogen peroxide flowmeter (M14), and the Fenton reactor C (M15); The outlet pipe of Fenton reactor D (M16) is connected to the outlet buffer tank (M19) after passing through the composite alkali solution dosing device (M17) and the Fenton outlet mixed pH meter (M18); The outlet water buffer tank (M19) is connected to the pipeline of the polydimethyldiallyl ammonium chloride solution pumped out by the polydimethyldiallyl ammonium chloride solution dosing device (M20), and the polydimethyldiallyl ammonium chloride solution dosing device (M20) is equipped with a polydimethyldiallyl ammonium chloride solution flow meter (M21); the outlet water buffer tank (M19) is connected to the pipeline of the cationic polyacrylamide solution pumped out by the cationic polyacrylamide solution dosing device (M22), and the cationic polyacrylamide solution flow meter (M23) is installed at the rear end of the cationic polyacrylamide solution dosing device (M22); The outlet end of the outlet buffer tank (M19) is connected to the plate and frame filter press (M24).

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