Wastewater treatment method for hydrogen peroxide device

Abstract

The invention discloses a wastewater treatment method for a hydrogen peroxide device, and belongs to the technical field of wastewater treatment.The wastewater treatment device comprises a flocculation basin, a first water inlet pipeline and a second water inlet pipeline are arranged on one side of the flocculation basin, a coagulation basin is arranged next to one side of the flocculation basin, a sedimentation basin is arranged next to one side of the coagulation basin, sludge is arranged in the sedimentation basin, and a drainage pipeline is arranged on the sedimentation basin; according to the invention, sulfide in the wastewater in the PO device and hydrogen peroxide in the wastewater in the HP device are ingeniously utilized to carry out oxidation reaction, so that the hydrogen peroxide in the wastewater in the HP device is degraded, the cost of using a flocculating agent is greatly saved, and the economic benefit of an enterprise is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and specifically to a method for treating wastewater from a hydrogen peroxide device. Background Art

[0002] Hydrogen peroxide is a chemical raw material with a wide range of market applications. It can be used as a raw material for devices such as propylene oxide and can also be directly applied to the market. It is used in multiple industries such as medicine, chemical industry, and pesticides. There are nearly a hundred downstream products, making it an important raw material for fine chemical products.

[0003] Currently, the main industrial production method of hydrogen peroxide in the world is the anthraquinone method. During the production process, a large amount of production wastewater is generated, and the production wastewater contains high levels of phosphorus, hydrogen peroxide, anthraquinone, aromatic hydrocarbons and other raw and auxiliary materials.

[0004] For the treatment of hydrogen peroxide wastewater, due to its unique characteristics, the existing technology treats the hydrogen peroxide in the wastewater through the Fenton reaction. The Fenton reaction is a common advanced oxidation technology. Its main principle is to use ferrous ions (Fe2+) and hydrogen peroxide (H2O2) to react under acidic conditions to generate hydroxyl radicals (·OH), thereby oxidizing and degrading organic matter. The chemical equation of the Fenton reaction can be expressed as:

[0005] Fe2+ + H2O2 → Fe3+ + OH· + OH-;

[0006] In this process, ferrous ions are oxidized to ferric ions (Fe3+), while hydroxyl radicals and hydroxide ions (OH-) are generated. Hydroxyl radicals have strong oxidation ability and can react with organic matter to degrade it into small molecule organic matter, carbon dioxide (CO2) and water (H2O) and other inorganic substances. In addition, ferric ions can be reduced to ferrous ions under certain conditions, thus forming a cyclic catalytic process.

[0007] It should be noted that the efficiency of the Fenton reaction is affected by various factors, including pH value, H2O2 dosage, Fe2+ dosage, reaction time and reaction temperature, etc. For example, when the pH value is between 3 - 5, the oxidation ability of the Fenton reagent is the strongest; the dosages of H2O2 and Fe2+ need to be appropriate, too much or too little will affect the reaction efficiency; increasing the temperature will accelerate the reaction rate, but too high a temperature will cause H2O2 to decompose. At the same time, the Fenton oxidation method for treating hydrogen peroxide sewage consumes a large amount of chemicals and has a high operating cost. Summary of the Invention

[0008] In order to solve the technical problems mentioned in the above background art, the present invention provides a method for treating wastewater from a hydrogen peroxide device, and the technical solution adopted is as follows:

[0009] It includes a flocculation tank. A first water inlet pipeline and a second water inlet pipeline are arranged on one side of the flocculation tank. A coagulation tank is closely arranged on one side of the flocculation tank. A sedimentation tank is closely arranged on one side of the coagulation tank. Sludge is arranged in the sedimentation tank. A drainage pipeline is arranged on the sedimentation tank. Inclined tubes are arranged on the drainage pipeline.

[0010] Furthermore, an aeration pipeline is arranged at the bottom of the flocculation tank.

[0011] Furthermore, a flocculation agitator is arranged in the flocculation tank.

[0012] Furthermore, a coagulation agitator is arranged in the coagulation tank.

[0013] Furthermore, a sludge pump is arranged on the lower side of the sedimentation tank. The sludge pump is connected to the sedimentation tank and the coagulation tank respectively through a sludge pipeline.

[0014] The present invention has the following advantages: By mixing the wastewater containing hydrogen peroxide in the HP device in the anthraquinone process and the wastewater containing sulfide that has undergone anaerobic treatment in the PO device into the flocculation tank together, the hydrogen peroxide in the wastewater in the HP device reacts with the sulfide, so that the hydrogen peroxide oxidizes the sulfide into sulfate ions, and flocculation sludge is generated in the mixed water, thereby achieving the purpose of degrading the hydrogen peroxide in the wastewater. The mixed water then enters the coagulation tank to further degrade the hydrogen peroxide, and then enters the sedimentation tank. The flocculation sludge remains in the sedimentation tank, and the mixed water with degraded hydrogen peroxide is discharged through the drainage pipeline and the inclined tubes. The present invention cleverly utilizes the oxidation reaction between the sulfide in the wastewater in the PO device and the hydrogen peroxide in the wastewater in the HP device to degrade the hydrogen peroxide in the wastewater of the HP device, greatly saving the cost of using flocculants and improving the economic benefits of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a process schematic diagram of the present invention.

[0016] Drawings: 1. First water inlet pipeline, 2. Second water inlet pipeline, 3. Flocculation agitator, 4. Coagulation agitator, 5. Flocculation tank, 6. Coagulation tank, 7. Sedimentation tank, 8. Inclined tubes, 9. Aeration pipeline, 10. Sludge pipeline, 11. Drainage pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0018] Please refer to Figure 1, the present invention provides a method for treating wastewater in a hydrogen peroxide device, including a flocculation tank 5. A first water inlet pipeline 1 and a second water inlet pipeline 2 are arranged on one side of the flocculation tank 5. In the production of propylene oxide by the anthraquinone method, the HP device (hydrogen peroxide production device) and the PO device (propylene oxide production device) are two core components. The wastewater generated by the HP device contains hydrogen peroxide. A coagulation tank 6 is closely arranged on one side of the flocculation tank 5. The wastewater generated by the HP device enters the flocculation tank 5 through the first water pipeline 1. The wastewater generated by the PO device contains sulfides. The wastewater generated by the PO device enters the flocculation tank 5 through the second water inlet pipeline 2. The two wastewaters are mixed in the flocculation tank 5. A sedimentation tank 7 is closely arranged on one side of the coagulation tank 6. The wastewater in the flocculation tank 5 overflows the flocculation tank 5 and enters the coagulation tank 6 for further mixing after the mixed reaction. Sludge 12 is arranged in the sedimentation tank 7. The hydrogen peroxide in the wastewater of the HP device oxidizes the sulfides in the wastewater of the PO device, so that the hydrogen peroxide in the wastewater of the HP device is degraded. A drainage pipeline 11 is arranged on the sedimentation tank 7. An inclined tube 8 is arranged on the drainage pipeline 11. The wastewater in the coagulation tank 6 overflows the coagulation tank 6 and enters the sedimentation tank 7. The flocculation sludge generated in the wastewater remains in the sedimentation tank 7. The upper-layer wastewater removing hydrogen peroxide enters the drainage pipeline 11 and is discharged into the inclined tube 8. The inclined tube 8 slopes downward at 60°, which is convenient for the discharge of wastewater.

[0019] An aeration pipeline 9 is arranged at the bottom of the flocculation tank 5. By aerating the mixed wastewater in the flocculation tank 5, the wastewater of the HP device and the wastewater of the PO are mixed more fully. A flocculation stirrer 3 is arranged in the flocculation tank 5 to stir the wastewater in the flocculation tank 5. A coagulation stirrer 4 is arranged in the coagulation tank 6 to stir the wastewater in the coagulation tank 6. A sludge pump is arranged on the lower side of the sedimentation tank 7. The sludge pump is connected to the sedimentation tank 7 and the coagulation tank 6 respectively through a sludge pipeline 10. The flocculation sludge in the sedimentation tank 7 is refluxed to the coagulation tank 6 through the sludge pump and the sludge pipeline 10 to make the hydrogen peroxide and sulfides in the flocculation sludge react fully again.

[0020] The working principle of the present invention: The wastewater of the HP device enters the flocculation tank 5 through the first water inlet pipeline 1. The wastewater of the PO device enters the flocculation tank 5 through the second water inlet pipeline 2. The two wastewaters are mixed in the flocculation tank 5. The flocculation stirrer 3 stirs the wastewater in the flocculation tank 5. The hydrogen peroxide in the wastewater of the HP device reacts with the sulfides in the wastewater of the PO device to generate sulfate ions. Flocculation sludge is generated in the wastewater, and the hydrogen peroxide is degraded. The wastewater and flocculation sludge in the flocculation tank 5 overflow the flocculation tank 5 and enter the coagulation tank 6. The coagulation stirrer 4 stirs the sewage in the coagulation tank 6. The sewage in the coagulation tank 6 overflows the coagulation tank 6 and enters the sedimentation tank 7. The flocculation sludge remains in the sedimentation tank 7, and the wastewater removing hydrogen peroxide enters the drainage pipeline 11 and is discharged.

[0021] The operation of the present invention is simple and convenient to use, and is suitable for comprehensive promotion and application. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for treating wastewater from a hydrogen peroxide device, characterized in that: The invention comprises a flocculation tank (5), wherein a first water inlet pipeline (1) and a second water inlet pipeline (2) are arranged on one side of the flocculation tank (5), a coagulation tank (6) is arranged adjacent to one side of the flocculation tank (5), and a sedimentation tank (7) is arranged adjacent to one side of the coagulation tank (6), sludge (12) is arranged in the sedimentation tank (7), a drainage pipeline (11) is arranged on the sedimentation tank (7), and an inclined pipe (8) is arranged on the drainage pipeline (11).

2. A method for treating wastewater from a hydrogen peroxide device according to claim 1, characterized in that: An aeration pipeline (9) is arranged at the bottom of the flocculation tank (5).

3. A method for treating wastewater from a hydrogen peroxide device according to claim 1, characterized in that: A flocculation stirrer (3) is arranged in the flocculation tank (5).

4. A method for treating wastewater from a hydrogen peroxide device according to claim 1, characterized in that: A coagulation stirrer (4) is arranged in the coagulation tank (6).

5. A method for treating wastewater from a hydrogen peroxide device according to claim 1, characterized in that: A sludge pump is arranged at the lower side of the sedimentation tank (7), and the sludge pump is connected to the sedimentation tank (7) and the coagulation tank (6) respectively through a sludge pipeline (10).

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