Chemical sewage decolorization treatment system

Abstract

The utility model belongs to the technical field of chemical sewage treatment, and relates to a chemical sewage decoloration treatment system which comprises a pretreatment unit, a decoloration reaction unit and a gasification fine slag feeding device, an inlet of the decolorization reaction unit is communicated with the pretreatment unit; the gasification fine slag adding device is communicated with the decoloration reaction unit; according to the chemical sewage decolorizing device, the gasification fine slag adding device is arranged, gasification fine slag is added into the decolorizing reaction unit through the gasification fine slag adding device, and the gasification fine slag physically adsorbs organic pollutants and coloring substances in the chemical sewage, so that the chromaticity of the chemical sewage is reduced; when the chromaticity standard of chemical sewage treatment is high, the gasified fine slag and the coagulant have a synergistic effect, and the dosage of the coagulant can be correspondingly reduced, so that the risk of secondary pollution to the environment caused by coagulant residues is reduced. In addition, the gasification fine slag is an industrial by-product or waste, the chromaticity of the chemical sewage is reduced through the gasification fine slag, and the utilization rate of the gasification fine slag is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical wastewater treatment, in particular to a chemical wastewater decolorization treatment system. Background Art

[0002] The discharge of chemical wastewater is extremely polluting to the environment. The color of chemical wastewater is a key indicator that must be strictly controlled during discharge. The color of chemical wastewater is primarily due to the presence of color-forming organic matter and nonferrous metal ions. These substances not only cause visual impairments and sensory pollution in the human living environment, but also pose a significant threat to the natural environment at a deeper level. Therefore, the treatment of chemical wastewater color has become a key research area in wastewater treatment.

[0003] There is some research on the color treatment of chemical wastewater in the prior art. See patent document with application number 201620333515.8, which discloses a chemical wastewater treatment system, including: an equalization tank, a reaction tank, a sedimentation tank, an intermediate tank, a filter, a clear water tank, a sludge tank, and a filter press; the sewage enters the equalization tank and is mixed evenly, and then enters the reaction tank to add coagulant and slaked lime to adjust the pH value, so that the tiny suspended matter and colloidal substances in the water produce coagulation and flocculation, and can also remove color, microorganisms and organic matter, etc. The water after the reaction enters the sedimentation tank for precipitation to remove impurities, and the water after precipitation treatment enters the intermediate tank to meet the discharge standards, or is filtered through a filter and enters the clear water tank. The sludge discharged from the sedimentation tank enters the sludge tank, and the mud cake is processed by the filter press and transported out.

[0004] It can be seen from this that by adding coagulants, tiny suspended matter and colloidal substances in sewage can be removed, thereby reducing the color of chemical sewage. However, when the color standard of chemical sewage treatment is high, in order to achieve a better decolorization effect, a large amount of coagulant needs to be added. As the amount of coagulant increases, the amount of residual coagulant in chemical sewage will also increase accordingly. The residue of excessive coagulant can easily cause secondary pollution to the environment, leading to potential ecological risks. Utility Model Content

[0005] In order to solve the technical problem in the background technology that when the chromaticity standard of chemical wastewater treatment is high, a large amount of coagulant needs to be added, and the excess coagulant residue is likely to cause secondary pollution to the environment, the utility model provides a chemical wastewater decolorization treatment system.

[0006] This new chemical wastewater decolorization treatment system is equipped with a gasified fine slag dosing device. The gasified fine slag is added to the decolorization reaction unit via the gasified fine slag dosing device. The gasified fine slag physically adsorbs organic pollutants and color-causing substances in the chemical wastewater, thereby reducing the chromaticity of the chemical wastewater. When the chromaticity standard for chemical wastewater treatment is high, the gasified fine slag and coagulant work synergistically, correspondingly reducing the amount of coagulant added, thereby alleviating the risk of secondary environmental pollution caused by coagulant residue. Furthermore, the gasified fine slag is an industrial byproduct or waste. Using the gasified fine slag to reduce the chromaticity of the chemical wastewater improves its utilization rate.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0008] A chemical wastewater decolorization treatment system comprises: a pretreatment unit, a decolorization reaction unit and a gasified fine slag dosing device; the inlet of the decolorization reaction unit is connected to the pretreatment unit; the gasified fine slag dosing device is connected to the decolorization reaction unit; wherein, the pretreatment unit is used to pretreat the chemical wastewater, the gasified fine slag dosing device is used to add gasified fine slag to the decolorization reaction unit, and the gasified fine slag decolorizes the pretreated chemical wastewater through physical adsorption.

[0009] In a specific embodiment, a first feeding device is provided at the inlet of the decolorization reaction unit; the first feeding device is connected to the inlet of the decolorization reaction unit and is used to feed a first flocculant into the inlet of the decolorization reaction unit.

[0010] In a specific embodiment, a second feeding device is provided at the outlet of the decolorization reaction unit; the second feeding device is connected to the outlet of the decolorization reaction unit and is used to feed a second flocculant to the outlet of the decolorization reaction unit.

[0011] In a specific embodiment, a stirring device is provided in the decolorization reaction unit; the stirring device is connected to the decolorization reaction unit.

[0012] In a specific possible implementation scheme, the pretreatment unit includes a regulating tank, a flotation tank, a hydrolysis tank, an aerobic tank and a first sedimentation tank connected in sequence from front to back; the regulating tank is used to receive chemical wastewater; the outlet of the first sedimentation tank is connected to the decolorization reaction unit.

[0013] In a specific embodiment, the chemical wastewater decolorization treatment system also includes a subsequent treatment unit, which includes a second sedimentation tank and a clear water tank; the inlet of the second sedimentation tank is connected to the decolorization reaction unit; the inlet of the clear water tank is connected to the outlet of the second sedimentation tank.

[0014] In a specific embodiment, the subsequent treatment unit further includes a sludge dewatering device; the sludge dewatering device is connected to the second sedimentation tank and is used to treat the sludge in the second sedimentation tank.

[0015] In a specific embodiment, the gasification fine slag adding device includes a gasification fine slag storage tank and a delivery pump; the outlet of the gasification fine slag storage tank is connected to the decolorization reaction unit through the delivery pump.

[0016] In a specific embodiment, the first feeding device includes a first feeding hopper and a first metering pump; the inlet of the first metering pump is connected to the first feeding hopper, and the outlet of the first metering pump is connected to the inlet of the decolorization reaction unit.

[0017] In a specific embodiment, the second feeding device includes a second feeding hopper and a second metering pump; the inlet of the second metering pump is connected to the second feeding hopper, and the outlet of the second metering pump is connected to the outlet of the decolorization reaction unit.

[0018] In summary, the present invention has the following beneficial technical effects:

[0019] 1. The present invention's chemical wastewater decolorization treatment system includes a gasification fine slag dosing device, which feeds gasification fine slag into the decolorization reaction unit. The gasification fine slag physically adsorbs organic pollutants and color-causing substances in the chemical wastewater, thereby reducing the chromaticity of the chemical wastewater. When the chromaticity standard for chemical wastewater treatment is high, the gasification fine slag and coagulant act synergistically, correspondingly reducing the amount of coagulant added, thereby alleviating the risk of secondary environmental pollution caused by coagulant residue. Furthermore, gasification fine slag is an industrial byproduct or waste. Using gasification fine slag to reduce the chromaticity of chemical wastewater improves its utilization rate.

[0020] 2. The chemical wastewater decolorization treatment system of the present invention comprises a first feeding device disposed at the inlet of the decolorization reaction unit. The first feeding device feeds a first flocculant into the inlet of the decolorization reaction unit, thereby promoting the agglomeration of suspended matter, colloidal matter, and the like in the effluent of the first sedimentation tank into larger particles. The larger particles are easily adsorbed by the vaporized fine residue, thereby enhancing the decolorization effect. A second feeding device is disposed at the outlet of the decolorization reaction unit. The second feeding device feeds a second flocculant into the outlet of the decolorization reaction unit, thereby further promoting the bonding of flocs already formed in the decolorization reaction unit, thereby enhancing the settling performance of the flocs and facilitating the settling of the effluent of the decolorization reaction unit in the second sedimentation tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model chemical wastewater decolorization treatment system.

[0022] Figure 2 This is a partial structural diagram of the chemical wastewater decolorization treatment system of the utility model, which is intended to illustrate the decolorization reaction unit.

[0023] Explanation of the accompanying drawings: 1. Pretreatment unit; 11. Equalization tank; 12. Flotation tank; 13. Hydrolysis tank; 14. Aerobic tank; 15. First sedimentation tank; 2. Decolorization reaction unit; 21. Stirring device; 3. Gasification fine slag feeding device; 31. Gasification fine slag storage tank; 32. Conveying pump; 4. First feeding device; 41. First feeding hopper; 42. First metering pump; 5. Second feeding device; 51. Second feeding hopper; 52. Second metering pump; 6. Subsequent treatment unit; 61. Second sedimentation tank; 62. Clear water tank; 63. Sludge dewatering device. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be further explained below with reference to the accompanying drawings and embodiments, but the present invention is not limited to the embodiments described below.

[0025] During the coal chemical production process, color-producing organic substances dissolve or decompose into chemical wastewater, causing it to appear colored. Furthermore, the composition of raw coal pyrolysis wastewater is complex, including high concentrations of organic compounds such as phenols and benzene series. The unsaturated bonds and conjugated systems in their molecular structures absorb specific wavelengths of light, thus exhibiting color. Microbial metabolites in biochemical treatment systems may also produce some colored substances. Chemical wastewater with high color poses a significant pollution threat to the natural environment. Therefore, decolorization of coal chemical wastewater is particularly important. The present utility model is applicable to the decolorization of chemical wastewater during coal chemical production.

[0026] Reference Figure 1 A chemical wastewater decolorization treatment system includes: a pretreatment unit 1, a decolorization reaction unit 2, and a gasified fine slag dosing device 3. The inlet of the decolorization reaction unit 2 is connected to the pretreatment unit 1; the gasified fine slag dosing device 3 is connected to the decolorization reaction unit 2. The pretreatment unit 1 is used to pretreat the chemical wastewater, and the gasified fine slag dosing device 3 is used to add gasified fine slag to the decolorization reaction unit 2. The gasified fine slag decolorizes the pretreated chemical wastewater through physical adsorption.

[0027] In the present invention, the decolorization reaction unit 2 utilizes the Fenton process, a process well known to those skilled in the art, to treat pretreated chemical wastewater. Specifically, the decolorization reaction unit 2 comprises a rapid mixing tank, a Fenton reaction tank, a slow mixing tank, and a decolorization sedimentation tank, which are connected in sequence from front to back. The rapid mixing tank is connected to the regulating tank 11, and the decolorization sedimentation tank is connected to the second sedimentation tank 61.

[0028] In the present invention, gasified fine slag is added to the decolorization reaction unit 2 through the gasified fine slag adding device 3; the amount of gasified fine slag added is not specifically limited, and the operator can add the required amount of gasified fine slag according to the chromaticity requirements of chemical wastewater treatment.

[0029] In the utility model, the surface of the gasified fine slag is hydrophobic, making it easy to adsorb and remove organic pollutants and coloring substances in chemical wastewater; the surface roughness of the gasified fine slag is relatively large, and the rough surface provides more adsorption sites, which is convenient for adsorbing and removing suspended matter, colloidal substances and organic pollutants in chemical wastewater; the gasified fine slag has a porous structure, and the porous structure provides more diffusion paths and reaction spaces for pollutants in chemical wastewater, and the pore size distribution is diverse. The diversity of the pore size distribution enables the gasified fine slag to effectively remove pollutants of different scales.

[0030] Reference Figure 1 The gasification fine slag adding device 3 includes a gasification fine slag storage tank 31 and a delivery pump 32. The outlet of the gasification fine slag storage tank 31 is connected to the decolorization reaction unit 2 through the delivery pump 32.

[0031] Reference Figure 1 and Figure 2 A first feeding device 4 is provided at the inlet of the decolorization reaction unit 2. The first feeding device 4 is communicated with the inlet of the decolorization reaction unit 2 and is used to feed the first flocculant into the inlet of the decolorization reaction unit 2.

[0032] Specifically, the first flocculant can be polyacrylamide, polyaluminum chloride, polyferric sulfate, etc., and the first flocculant is added to the inlet of the decolorization reaction unit 2 to cause suspended matter, colloidal substances, etc. in the effluent of the pretreatment unit 1 to condense into larger particles. This type of first flocculant can be used. In the present utility model, the first flocculant is polyaluminum chloride; the dosage of polyaluminum chloride is not specifically limited, and the operator can determine the dosage of polyaluminum chloride based on actual needs. When in use, the required amount of polyaluminum chloride is prepared as an aqueous solution and added to the inlet of the decolorization reaction unit 2 through the second feeding device 5.

[0033] Reference Figure 1 and Figure 2 The first feeding device 4 includes a first feeding hopper 41 and a first metering pump 42. The inlet of the first metering pump 42 is connected to the first feeding hopper 41, and the outlet of the first metering pump 42 is connected to the inlet of the decolorization reaction unit 2.

[0034] Specifically, the pretreatment unit 1 is connected to the decolorization reaction unit 2 through a first pipeline, and the outlet of the first metering pump 42 is connected to the first pipeline.

[0035] Reference Figure 1 and Figure 2A second feeding device 5 is provided at the outlet of the decolorization reaction unit 2. The second feeding device 5 is communicated with the outlet of the decolorization reaction unit 2 and is used to feed the second flocculant to the outlet of the decolorization reaction unit 2.

[0036] Specifically, the second flocculant can be polyacrylamide, polyaluminum chloride, polyferric sulfate, or the like. Adding the second flocculant to the outlet of the decolorization reaction unit 2 further promotes the bonding of the flocs already formed in the effluent from the decolorization reaction unit 2. Any of these second flocculants are acceptable. In the present invention, the second flocculant is polyacrylamide; the dosage of polyacrylamide is not specifically limited; the operator can determine the dosage based on actual needs. During use, the required amount of polyacrylamide is prepared as an aqueous solution and added to the outlet of the decolorization reaction unit 2 via the second feeding device 5.

[0037] Reference Figure 1 and Figure 2 The second feeding device 5 includes a second feeding hopper 51 and a second metering pump 52. The inlet of the second metering pump 52 is connected to the second feeding hopper 51, and the outlet of the second metering pump 52 is connected to the outlet of the decolorization reaction unit 2.

[0038] Specifically, the decolorization reaction unit 2 is connected to the subsequent processing unit 6 through a second pipeline, and the outlet of the second metering pump 52 is connected to the second pipeline.

[0039] Reference Figure 1 The pretreatment unit 1 includes a regulating tank 11, a flotation tank 12, a hydrolysis tank 13, an aerobic tank 14, and a first sedimentation tank 15, which are connected in sequence from front to back. The regulating tank 11 is used to receive chemical wastewater; the outlet of the first sedimentation tank 15 is connected to the decolorization reaction unit 2.

[0040] Specifically, the regulating tank 11 , the flotation tank 12 , the hydrolysis tank 13 , the aerobic tank 14 and the first sedimentation tank 15 are sequentially connected through pipelines.

[0041] In the present invention, the regulating tank 11 is used to homogenize and buffer the received chemical wastewater, delivering chemical wastewater with relatively stable water quality and quantity to subsequent processes. The chemical wastewater received by the regulating tank 11 comes from sources such as water collection well sewage, domestic wastewater, domestic wastewater from ferrosilicon plants, unqualified condensate wastewater, concentrated brine, neutralization wastewater, circulating water sewage, oily wastewater, gasification wastewater, phenol-ammonia recovery, methanol wash wastewater, and loading and unloading area sewage.

[0042] The flotation tank 12 is used to separate solids from liquids in chemical wastewater. Specifically, compressed air is introduced into the effluent from the regulating tank 11, generating a large number of microbubbles in the flotation tank 12. As these bubbles rise, they absorb suspended particles, grease, and other pollutants in the wastewater, forming a scum layer. Finally, a scraper removes the scum from the water surface.

[0043] The hydrolysis tank 13 is used to hydrolyze and acidify the recalcitrant macromolecular and heterocyclic organic compounds in the effluent from the flotation tank 12. Specifically, under anaerobic or facultative anaerobic conditions, the microorganisms in the hydrolysis tank 13 utilize their enzyme systems to gradually break down complex organic compounds into simpler ones. Simultaneously, the hydrolysis process also destroys the chromogenic groups in the dye molecules, helping to reduce the color of the effluent from the flotation tank 12.

[0044] The aerobic tank 14 is used to reduce the organic pollutant index in the effluent of the hydrolysis tank 13. Specifically, the aerobic microorganisms are used to further decompose the small molecular organic matter produced by the hydrolysis tank 13 into inorganic substances, such as carbon dioxide and water.

[0045] The first sedimentation tank 15 is used to remove suspended matter and bioflocs from the effluent of the aerobic tank 14. Specifically, through gravity settling, solid particles in the effluent of the aerobic tank 14 gradually settle to the bottom of the tank, forming a sludge layer. The supernatant then enters the decolorization reaction unit 2 through the outlet. In the present invention, the first sedimentation tank 15 is a sequencing batch sedimentation tank, which is well known to those skilled in the art. Sequential batch sedimentation tanks utilize gravity settling to remove suspended particles with a density greater than that of water from the wastewater.

[0046] The decolorization reaction unit 2 is used to reduce the chromaticity of the effluent from the first sedimentation tank 15. Specifically, first, a first flocculant is added to the rapid mixing tank to promote the coagulation of suspended matter, colloidal substances, etc. in the effluent from the first sedimentation tank 15 into larger particles; then, gasified fine slag is added to the rapid mixing tank to physically adsorb organic pollutants and color-causing substances in the chemical wastewater, thereby reducing the chromaticity of the chemical wastewater; then, the effluent from the rapid mixing tank is transferred to the Fenton reaction tank for Fenton reaction, a water treatment method well known to those skilled in the art; the effluent from the Fenton reaction tank is transferred to the slow mixing tank, where a second flocculant is added to enhance the bonding between the already formed flocs and improve the settling performance of the flocs; and the effluent from the slow mixing tank is transferred to the decolorization sedimentation tank, where the flocs settle under the action of gravity.

[0047] Example 1:

[0048] Reference Figure 1 In the chemical wastewater decolorization treatment system of this embodiment, the decolorization reaction unit 2 is provided with a stirring device 21. The stirring device 21 is connected to the decolorization reaction unit 2.

[0049] Specifically, the stirring device 21 can be a paddle stirrer, a propeller stirrer, or an anchor stirrer. The stirring device 21 is provided to promote thorough mixing of the gasified fine slag with the wastewater within the decolorization reaction unit 2. Any of these stirring devices 21 are acceptable. In this embodiment, the stirring device 21 is configured as a paddle stirrer. The paddle stirrer generates a large water circulation within the decolorization reaction unit 2, thereby evenly dispersing the gasified fine slag within the wastewater within the decolorization reaction unit 2.

[0050] In this embodiment, the stirring device 21 is provided to uniformly disperse the gasified fine slag in the sewage in the decolorization reaction unit 2 , thereby promoting the reaction rate of the gasified fine slag and the sewage in the decolorization reaction unit 2 .

[0051] Example 2:

[0052] Reference Figure 1 The chemical wastewater decolorization treatment system of this embodiment further includes a subsequent treatment unit 6, which includes a second sedimentation tank 61 and a clear water tank 62. The inlet of the second sedimentation tank 61 is connected to the decolorization sedimentation tank; the inlet of the clear water tank 62 is connected to the outlet of the second sedimentation tank 61.

[0053] Specifically, the second sedimentation tank 61 is used to remove sediment and residual suspended matter in the effluent of the decolorization sedimentation tank, and ensure that the concentration of suspended matter in the effluent of the second sedimentation tank 61 is reduced to a minimum through further sedimentation; the clear water tank 62 is used to store and discharge clear water that meets the standards.

[0054] In this embodiment, the second sedimentation tank 61 adopts a Fenton sedimentation tank well known to those skilled in the art, which generates hydroxyl radicals with strong oxidizing properties under acidic conditions through a mixed solution of hydrogen peroxide and divalent iron ions to achieve the degradation of organic matter in the effluent of the decolorization reaction unit 2.

[0055] Example 3:

[0056] Reference Figure 1 In the chemical wastewater decolorization treatment system of this embodiment, based on the embodiment 2, the subsequent treatment unit 6 further includes a sludge dewatering device 63. The sludge dewatering device 63 is connected to the second sedimentation tank 61 and is used to treat the sludge in the second sedimentation tank 61.

[0057] Specifically, the sludge dewatering device 63 can be a screw press sludge dewatering machine, a plate and frame filter press, or a belt filter press. The sludge dewatering device 63 is provided to treat the accumulated sludge in the second sedimentation tank 61, thereby improving the efficiency and stability of the entire chemical wastewater decolorization treatment system. Any of these types of sludge dewatering devices 63 are suitable. In this embodiment, the sludge dewatering device 63 is a screw press sludge dewatering machine, which is connected to the second sedimentation tank 61 via a pipeline.

[0058] In this embodiment, the sludge dewatering device 63 is provided so that the sludge in the second sedimentation tank 61 can be discharged in time, thereby ensuring the stable operation of the entire chemical wastewater decolorization treatment system.

[0059] The present invention provides a treatment process of a chemical wastewater decolorization treatment system as follows: first, the chemical wastewater enters the regulating tank 11, which homogenizes and buffers the received chemical wastewater to provide chemical wastewater with relatively stable water quality and water volume for subsequent treatment; then, the effluent from the regulating tank 11 flows into the flotation tank 12, in which the suspended particles, grease and other pollutants in the effluent from the regulating tank 11 form a scum layer, which is scraped off by the operator; the effluent from the flotation tank 12 flows into the hydrolysis tank 13, in which part of the organic matter in the effluent from the flotation tank 12 is converted into substances that are easily biodegradable; then, the effluent from the hydrolysis tank 13 flows into the aerobic tank 14, in which microorganisms multiply in large quantities and decompose the organic matter in the wastewater to further purify the water quality; the effluent from the aerobic tank 14 flows into the first sedimentation tank 15, in which the suspended matter and biological flocs in the effluent from the aerobic tank 14 are removed by gravity. The gasified fine slag is precipitated to the bottom of the tank, and the supernatant flows into the decolorization reaction unit 2; in the decolorization reaction unit 2, the gasified fine slag dosing device 3 adds the gasified fine slag to the chemical wastewater through the delivery pump 32, and at the same time, the first feeding device 4 feeds the first flocculant to the inlet of the decolorization reaction unit 2, and the stirring device 21 is started to fully mix the gasified fine slag with the wastewater, and the gasified fine slag physically adsorbs the organic pollutants and coloring substances in the chemical wastewater, thereby reducing the chroma of the chemical wastewater. At the same time, the second feeding device 5 feeds the second flocculant to the outlet of the decolorization reaction unit 2, further promoting the combination of the flocs already formed in the decolorization reaction unit 2; then, the effluent from the decolorization reaction unit 2 flows into the second sedimentation tank 61, in which the remaining suspended matter and particulate matter continue to precipitate, further purifying the water quality; finally, the effluent from the second sedimentation tank 61 flows into the clear water tank 62, where it is temporarily stored or discharged.

[0060] The preferred embodiments of the present invention are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A chemical wastewater decolorization treatment system, characterized in that: include: Preprocessing unit (1); a decolorization reaction unit (2), wherein the inlet of the decolorization reaction unit (2) is in communication with the pretreatment unit (1); and a gasification fine slag dosing device (3), wherein the gasification fine slag dosing device (3) is connected to the decolorization reaction unit (2); The pretreatment unit (1) is used to pretreat chemical wastewater, the gasified fine slag adding device (3) is used to add gasified fine slag to the decolorization reaction unit (2), and the gasified fine slag decolorizes the pretreated chemical wastewater through physical adsorption.

2. The chemical wastewater decolorization treatment system according to claim 1, characterized in that: A first feeding device (4) is provided at the inlet of the decolorization reaction unit (2); The first feeding device (4) is connected to the inlet of the decolorization reaction unit (2) and is used to feed the first flocculant into the inlet of the decolorization reaction unit (2).

3. The chemical wastewater decolorization treatment system according to claim 2, characterized in that: A second feeding device (5) is provided at the outlet of the decolorization reaction unit (2); The second feeding device (5) is connected to the outlet of the decolorization reaction unit (2) and is used to feed the second flocculant to the outlet of the decolorization reaction unit (2).

4. The chemical wastewater decolorization treatment system according to claim 3, characterized in that: The decolorization reaction unit (2) is provided with a stirring device (21); The stirring device (21) is connected to the decolorization reaction unit (2).

5. The chemical wastewater decolorization treatment system according to any one of claims 1 to 4, characterized in that: The pretreatment unit comprises a regulating tank (11), an air flotation tank (12), a hydrolysis tank (13), an aerobic tank (14) and a first sedimentation tank (15) which are sequentially connected from front to back; The regulating tank (11) is used to receive chemical wastewater; The outlet of the first sedimentation tank (15) is connected to the decolorization reaction unit (2).

6. The chemical wastewater decolorization treatment system according to claim 5, characterized in that: The chemical wastewater decolorization treatment system further comprises a subsequent treatment unit (6), wherein the subsequent treatment unit (6) comprises a second sedimentation tank (61) and a clear water tank (62); The inlet of the second sedimentation tank (61) is connected to the decolorization reaction unit (2); The inlet of the clear water tank (62) is communicated with the outlet of the second sedimentation tank (61).

7. The chemical wastewater decolorization treatment system according to claim 6, characterized in that: The subsequent treatment unit (6) further includes a sludge dewatering device (63); The sludge dewatering device (63) is connected to the second sedimentation tank (61) and is used to process the sludge in the second sedimentation tank (61).

8. The chemical wastewater decolorization treatment system according to claim 1, characterized in that: The gasified fine slag adding device (3) comprises a gasified fine slag storage tank (31) and a delivery pump (32); The outlet of the gasified fine slag storage tank (31) is connected to the decolorization reaction unit (2) via a delivery pump (32).

9. The chemical wastewater decolorization treatment system according to claim 2, characterized in that: The first feeding device (4) includes a first feeding hopper (41) and a first metering pump (42); The inlet of the first metering pump (42) is communicated with the first feed hopper (41), and the outlet of the first metering pump (42) is communicated with the inlet of the decolorization reaction unit (2).

10. The chemical wastewater decolorization treatment system according to claim 3, characterized in that: The second feeding device (5) comprises a second feeding hopper (51) and a second metering pump (52); The inlet of the second metering pump (52) is communicated with the second feed hopper (51), and the outlet of the second metering pump (52) is communicated with the outlet of the decolorization reaction unit (2).

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