A device for treating recalcitrant dyes in dyeing and printing wastewater

Abstract

This utility model discloses a device for treating recalcitrant dyes in printing and dyeing wastewater, belonging to the field of printing wastewater treatment technology. It includes a treatment tank, an iron-carbon micro-electrolysis component disposed inside the treatment tank for pretreatment and primary oxidation of recalcitrant dyes in printing wastewater, a first mounting plate, an ultraviolet photocatalytic component disposed at the bottom of the iron-carbon micro-electrolysis component to accelerate the oxidation of recalcitrant dyes, and a second mounting plate disposed at the bottom of the first mounting plate. The effect is that by combining the iron-carbon micro-electrolysis component, the ultraviolet photocatalytic component, and the persulfate activation component, three oxidation mechanisms—in-situ generation of active substances by iron-carbon micro-electrolysis, ultraviolet photocatalysis, and persulfate activation—multiple strong oxidizing free radicals are generated, forming a multi-stage synergistic oxidation effect. This allows for sufficient reaction treatment of recalcitrant dyes in printing waste, thereby enabling the printing wastewater to meet discharge standards and reducing harm to the natural environment.

Description

Technical Field

[0001] This utility model belongs to the field of printing wastewater treatment technology, and in particular, it is a device for treating recalcitrant dyes in printing and dyeing wastewater. Background Technology

[0002] Printing wastewater refers to industrial wastewater containing high concentrations of pollutants and with complex compositions generated during the printing production process (including pre-press preparation, printing, and post-press processing). Its characteristics are directly related to the printing process and the materials used (such as inks, paper, and chemicals), making it one of the most challenging aspects of industrial wastewater treatment. Recalcitrant dyes in printing wastewater specifically refer to a class of synthetic colorants used in printing inks, varnishes, and other materials. These dyes are characterized by stable chemical structures, high biotoxicity, and poor water solubility, making them difficult to remove effectively through conventional physical adsorption or biological treatment. These substances are the core source of the high color intensity and high toxicity of printing wastewater and represent a significant technological bottleneck in wastewater treatment.

[0003] In the field of printing wastewater treatment, especially for wastewater with complex composition, high color, and a large amount of recalcitrant organic matter, adsorption methods are widely used due to their simplicity and rapid effectiveness. Activated carbon adsorption is one of the most common treatment methods, which can effectively reduce some COD and color by physically adsorbing pollutants in wastewater through its porous structure. However, with the increasing use of highly stable dyes and synthetic resins in the printing industry, traditional adsorption methods have gradually revealed significant shortcomings in treating such wastewater.

[0004] Poor selectivity for recalcitrant dyes: Although activated carbon can adsorb small molecule organic matter, its adsorption capacity for recalcitrant dyes and polymer resins with large molecular weight and stable structure is extremely low. Due to its rigid planar macrocyclic structure, it is difficult to enter the carbon pores, and it is easy to saturate and difficult to regenerate: Ink particles and colloidal substances in printing wastewater will quickly block the micropores of activated carbon, resulting in a shortened adsorption saturation cycle. Frequent regeneration not only increases operating costs, but also causes the adsorbent performance to degrade.

[0005] The purpose of this invention is to provide a device for treating recalcitrant dyes in dyeing and printing wastewater, so as to solve the problems mentioned in the background art. Utility Model Content

[0006] The purpose of this invention is to provide a device for treating recalcitrant dyes in dyeing and printing wastewater, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a device for treating recalcitrant dyes in printing and dyeing wastewater, comprising a treatment tank, an iron-carbon micro-electrolysis component disposed inside the treatment tank for pretreatment and primary oxidation of recalcitrant dyes in printing wastewater, a first mounting plate, an ultraviolet photocatalytic component disposed at the bottom of the iron-carbon micro-electrolysis component for accelerating the oxidation treatment of recalcitrant dyes, a second mounting plate disposed at the bottom of the first mounting plate, a persulfate activation component disposed at the bottom of the ultraviolet photocatalytic component for enhancing the thorough oxidation treatment of recalcitrant dyes, a third mounting plate disposed at the bottom of the treatment tank, and support legs disposed at the bottom of the treatment tank.

[0008] Furthermore, the first mounting plate is fixedly installed inside the processing tank, a first processing layer is provided inside the first mounting plate, an air inlet pipe is provided at the bottom of the first processing layer, the air inlet pipe extends outside the processing tank, and a first guide pipe is provided at the bottom of the first mounting plate.

[0009] Furthermore, a gas flow meter is installed on the outside of the air intake pipe, and an air pump for supplying oxygen to the first processing layer is also installed on the outside of the air intake pipe.

[0010] Furthermore, a plurality of mounting plates are evenly arranged on the outer side of the second mounting plate, the mounting plates are connected to the processing tank, a second processing layer is provided inside the second mounting plate, and a plurality of mounting slots are provided inside the processing tank.

[0011] Furthermore, a protective sleeve is provided inside each of the mounting slots, and an ultraviolet lamp is provided inside the protective sleeve. A second guide pipe is provided at the bottom of the second mounting plate.

[0012] Furthermore, an outlet is provided between the support legs, an inlet is provided on the top of the treatment tank, an installation box is provided on one side of the treatment tank, the installation box is connected to the treatment tank, a guide plate is provided on one side of the installation box, and a controller is provided on the outside of the treatment tank.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This invention combines an iron-carbon micro-electrolysis component, an ultraviolet photocatalysis component, and a persulfate activation component. It utilizes three oxidation mechanisms—in-situ generation of active substances through iron-carbon micro-electrolysis, ultraviolet photocatalysis, and persulfate activation—to generate a variety of highly oxidizing free radicals, forming a multi-level synergistic oxidation effect. This allows for the full reaction treatment of recalcitrant dyes in printing waste, enabling the printing wastewater to meet discharge standards and reducing harm to the natural environment. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the first processing layer in this utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the second processing layer in this utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the third mounting plate in this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] In the picture:

[0022] 1. Processing tank; 2. Liquid inlet; 3. Controller; 4. Mounting box; 5. Support leg; 6. Air inlet pipe; 7. Air pump; 8. Gas flow meter; 9. First mounting plate; 10. First processing layer; 11. Mounting plate; 12. Second mounting plate; 13. Second processing layer; 14. Mounting groove; 15. Protective sleeve; 16. Ultraviolet lamp; 17. Third mounting plate; 18. Guide plate; 19. Liquid outlet; 20. First guide pipe; 21. Second guide pipe. Detailed Implementation

[0023] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0024] Unless otherwise defined, the directions mentioned herein, such as up, down, left, right, front, back, inside, and outside, are based on the directions shown in the figures of this utility model, and are explained here together.

[0025] The connection method can be any existing method, such as bonding, welding, or bolting, depending on the actual needs.

[0026] Please see Figures 1 to 4As shown, a device for treating recalcitrant dyes in dyeing and printing wastewater includes a treatment tank 1, support legs 5 located at the bottom of the treatment tank 1, an outlet 19 between the support legs 5, an inlet 2 at the top of the treatment tank 1, and a guide plate 18 on one side of the mounting box 4. A controller 3 is located on the outside of the treatment tank 1, and the controller 3 is connected to an air pump 7 and an ultraviolet lamp 16 to adjust the air intake into the first treatment layer 10 and the light intensity of the ultraviolet lamp 16. The connection method between the controller 3 and the air pump 7 and the ultraviolet lamp 16 is prior art and well known to those skilled in the art, so it will not be described in detail here.

[0027] An iron-carbon micro-electrolysis assembly, installed inside the treatment tank 1, is used for pretreatment and primary oxidation of recalcitrant dyes in printing wastewater. It includes a first mounting plate 9, which is fixedly installed inside the treatment tank 1. A first treatment layer 10 is located within the first mounting plate 9 and filled with iron-carbon micro-electrolysis filler. The filler is composed of a uniform mixture of cast iron filings and activated carbon particles in a specific volume ratio. This filler is used to break down the chromophores and some structural components of the dye molecules, improving the biodegradability / oxidizability of the wastewater. Simultaneously, the iron-carbon filler itself also has certain adsorption and flocculation effects. An air inlet pipe 6 is located at the bottom of the first treatment layer 10, extending outside the treatment tank 1. A first guide pipe 20 is located at the bottom of the first mounting plate 9. A gas flow meter 8 is located outside the air inlet pipe 6, and an air pump 7 is also located outside the air inlet pipe 6 to supply oxygen to the first treatment layer 10. The function of the air pump 7 is to accelerate the oxidation reaction of recalcitrant dyes within the first treatment layer 10.

[0028] An ultraviolet photocatalytic component, located at the bottom of the iron-carbon micro-electrolysis component, is used to accelerate the oxidation treatment of recalcitrant dyes. It includes a second mounting plate 12 located at the bottom of the first mounting plate 9. Several mounting plates 11 are evenly distributed on the outer side of the second mounting plate 12, connecting to the treatment tank 1. A second treatment layer 13 is disposed within the second mounting plate 12. This second treatment layer 13 is filled with a supported photocatalyst, which is made by loading titanium dioxide, graphitic carbon nitride, or a composite material of both onto the surface of a porous carrier (such as activated carbon balls, ceramsite, or zeolite molecular sieves). Several mounting slots 14 are provided inside the treatment tank 1, and a protective sleeve 15, made of quartz, is installed within each mounting slot 14. Made to protect the ultraviolet lamp 16, the ultraviolet lamp 16 is installed inside the protective sleeve 15. Under the irradiation of the ultraviolet lamp 16, pollutants can be oxidized and degraded. The bottom of the second mounting plate 12 is provided with a second guide pipe 21. The persulfate activation component is set at the bottom of the ultraviolet photocatalytic component to enhance the thorough oxidation treatment of recalcitrant dyes. It includes a third mounting plate 17 set at the bottom of the treatment tank 1. The side of the treatment tank 1 is provided with a mounting box 4, which is connected to the treatment tank 1. The mounting box 4 is used to store sulfate. The printing wastewater after being catalyzed by the ultraviolet lamp 16 is discharged into the third mounting plate 17 through the second guide pipe 21. After adding sulfate, the recalcitrant organic matter remaining in the first two stages of treatment can be completely mineralized.

[0029] Working principle: Iron-carbon micro-electrolysis component: After printing wastewater enters the treatment tank 1 through the inlet 2, it is placed in the first treatment layer 10 in the first installation plate 9, which destroys the chromophores and part of the structure of the dye molecules, improving the biodegradability / oxidizability of the wastewater. At the same time, the iron-carbon filler itself also has a certain adsorption and flocculation effect.

[0030] Ultraviolet photocatalytic component: The water effluent from the micro-electrolysis layer enters the second treatment layer 13 in the second installation plate 12 through the first guide pipe 20. Under the irradiation of the ultraviolet lamp 16, these highly active species can directly oxidize and degrade pollutants, or react with water / dissolved oxygen to generate more active oxygen species. At the same time, the residual recalcitrant oxides in this layer of water can also react under the action of the ultraviolet lamp 16.

[0031] Persulfate activation component: The ultraviolet photocatalytic layer effluent contains abundant photogenerated electrons, which enter the third mounting plate 17 through the second guide pipe 21. Then, sulfate is added to the mounting box on one side of the treatment tank 1 and enters the third mounting plate 17 through the guide plate 18. Both Fe2+ and photogenerated electrons can efficiently activate persulfate. These strong oxidizing free radicals can completely mineralize the recalcitrant organic matter remaining in the first two stages of treatment.

[0032] Separation and discharge: After the wastewater undergoes three-stage synergistic oxidation treatment, it enters the outlet 19. After separating the small amount of gas (such as CO2) generated during the reaction, it is discharged from the outlet 19. A small amount of accumulated iron sludge can be discharged periodically through the bottom sludge discharge port (not shown in the figure, set at the bottom of the treatment tank 1).

[0033] It should be noted that, in this document, relational terms such as "one" and "two" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the phrase "comprising an element defined as..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A device for treating recalcitrant dyes in dyeing and printing wastewater, characterized in that: include Processing tank (1); The iron-carbon micro-electrolysis component is installed inside the treatment tank (1) and is used for pretreatment and primary oxidation of recalcitrant dyes in printing wastewater, including the first mounting plate (9). An ultraviolet photocatalytic component is set at the bottom of the iron-carbon micro-electrolysis component to accelerate the oxidation treatment of recalcitrant dyes, including a second mounting plate (12) set at the bottom of the first mounting plate (9). The persulfate activation component, located at the bottom of the ultraviolet photocatalytic component, is used to enhance the thorough oxidation treatment of recalcitrant dyes, including the third mounting plate (17) located at the bottom of the treatment tank (1). Support leg (5) is located at the bottom of the processing tank (1).

2. The dyeing and printing wastewater recalcitrant dye treatment device according to claim 1, characterized in that: The first mounting plate (9) is fixedly installed inside the processing tank (1). A first processing layer (10) is provided inside the first mounting plate (9). An air inlet pipe (6) is provided at the bottom of the first processing layer (10). The air inlet pipe (6) extends out of the processing tank (1). A first guide pipe (20) is provided at the bottom of the first mounting plate (9).

3. The dyeing and printing wastewater recalcitrant dye treatment device according to claim 2, characterized in that: A gas flow meter (8) is provided on the outside of the air inlet pipe (6), and an air pump (7) for supplying oxygen to the first processing layer (10) is also provided on the outside of the air inlet pipe (6).

4. The dyeing and printing wastewater recalcitrant dye treatment device according to claim 1, characterized in that: The second mounting plate (12) is uniformly provided with a number of mounting plates (11) on its outer side. The mounting plates (11) are connected to the processing tank (1). The second mounting plate (12) is provided with a second processing layer (13). The processing tank (1) is provided with a number of mounting slots (14) inside.

5. The dyeing and printing wastewater recalcitrant dye treatment device according to claim 4, characterized in that: A protective sleeve (15) is provided inside each of the mounting slots (14), and an ultraviolet lamp (16) is provided inside the protective sleeve (15). A second guide pipe (21) is provided at the bottom of the second mounting plate (12).

6. The dyeing and printing wastewater recalcitrant dye treatment device according to claim 1, characterized in that: An outlet (19) is provided between the support legs (5), an inlet (2) is provided on the top of the treatment tank (1), an installation box (4) is provided on one side of the treatment tank (1), the installation box (4) is connected to the treatment tank (1), and a guide plate (18) is provided on one side of the installation box (4). A controller (3) is provided on the outside of the treatment tank (1).

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