Treatment device for dye intermediate production wastewater

Abstract

The utility model is suitable for dye production technical field provides a kind of dye intermediate production wastewater's treatment device, including the raw water regulating pond, pH regulating pond, fenton oxidation reactor, primary sedimentation tank, depth oxidation unit, secondary sedimentation tank and multiple-effect evaporator that communicate in proper order;The primary sedimentation tank is communicated with the depth oxidation unit by sludge acid solution pool;The secondary sedimentation tank is communicated with the pH regulating pond by divalent iron sludge pipeline;The multiple-effect evaporator is connected with condensate reuse device;Raw water regulating pond is equipped with stirring mechanism and aeration mechanism, and stirring mechanism and aeration mechanism are linked to set to realize wastewater homogenization.The dye intermediate production wastewater's treatment device provided in the scheme solves the problem of the single function of raw water regulating pond during the treatment of dye intermediate production wastewater.

Description

Technical Field

[0001] This utility model belongs to the field of dye production technology, and in particular relates to a treatment device for wastewater from the production of dye intermediates. Background Technology

[0002] The dye industry is an important sector of the fine chemical industry, closely linked to many other industries, and plays a vital role in my country's national economy.

[0003] However, wastewater from dye intermediate production is characterized by a wide variety of pollutants, high organic matter concentration, high salt content, and large fluctuations in water quality. Before entering subsequent treatment units (such as pH equalization tanks and Fenton oxidation reactors for dye intermediate production wastewater), it is necessary to homogenize the water quality and quantity through raw water equalization tanks to ensure the stability and treatment effect of subsequent treatment processes. Existing raw water equalization tanks mostly only have simple water storage functions, and wastewater is prone to stratification within the tank. High-concentration pollutants and salts are not mixed evenly with the water, making it difficult to accurately control the dosage of reagents in subsequent pH equalization and oxidation processes, thus affecting treatment efficiency. Utility Model Content

[0004] This utility model provides a treatment device for wastewater from dye intermediate production, aiming to solve the problem that the raw water equalization tank has a single function in the current treatment of wastewater from dye intermediate production.

[0005] This utility model is implemented as follows: a treatment device for wastewater from dye intermediate production includes: a raw water conditioning tank, a pH conditioning tank, a Fenton oxidation reactor, a primary sedimentation tank, a deep oxidation unit, a secondary sedimentation tank, and a multi-effect evaporator, connected in sequence; the primary sedimentation tank is connected to the deep oxidation unit through a sludge acid dissolution tank; the secondary sedimentation tank is connected to the pH conditioning tank through a divalent iron sludge pipeline; the multi-effect evaporator is connected to a condensate recycling device; the raw water conditioning tank is equipped with a stirring mechanism and an aeration mechanism, which are linked to achieve wastewater homogenization.

[0006] Preferably, the stirring mechanism includes: a motor and a speed regulator disposed on one side of the raw water regulating tank, wherein the output shaft of the motor and the input shaft of the speed regulator are connected by a coupling; a first rotating rod rotatably mounted in the raw water regulating tank via a sealed bearing seat; stirring blades fixed on the first rotating rod for breaking up the wastewater stratification structure and promoting the mixing of pollutants with the water; first pulleys respectively fixed on the output shaft of the speed regulator and the first rotating rod; and a first transmission belt sleeved on the first pulley.

[0007] Preferably, the aeration mechanism includes: an aeration pipe fixed in the raw water regulating tank by a bracket; an air guide shell disposed on one side of the raw water regulating tank, the air outlet of the air guide shell being fixedly connected to the aeration pipe through a connecting pipe; a second rotating rod rotatably mounted in the air guide shell by a bearing, the second rotating rod having a fan blade fixed on it, the fan blade rotating to generate airflow which is transported to the aeration pipe through the connecting pipe for introducing air into the wastewater to enhance the mixing effect; a second pulley fixed to the second rotating rod and the output shaft of the speed regulator, the second pulley having a second transmission belt sleeved on it.

[0008] Preferably, the deep oxidation unit includes: an ozone catalytic oxidation tank and an electrocatalytic oxidation tank connected in sequence, the ozone catalytic oxidation tank being connected to an ozone generator, and the anode plate of the electrocatalytic oxidation tank being a titanium-coated electrode and the cathode being a titanium mesh electrode.

[0009] Preferably, the Fenton oxidation reactor is connected to a hydrogen peroxide storage tank, and the primary sedimentation tank is connected to a coagulant aid storage tank, which stores polyacrylamide.

[0010] Preferably, the sludge acid dissolution tank is connected to the electrocatalytic oxidation tank through a ferric sludge pipeline, which is used to acid dissolve the ferric hydroxide sludge produced in the primary sedimentation tank and then introduce it into the electrocatalytic oxidation tank to reduce it to ferrous iron, thereby realizing the recycling of iron ions.

[0011] Preferably, the ozone is added to the ozone catalytic oxidation tank by jet injection. The ozone catalytic oxidation tank is used to oxidize and decompose organic matter under the catalysis of residual iron ions and increase the dissolved oxygen concentration in wastewater.

[0012] Compared with related technologies, the dye intermediate production wastewater treatment device provided by this utility model has the following beneficial effects: Wastewater homogenization is achieved through the linkage of the stirring and aeration mechanisms in the raw water equalization tank. Then, the wastewater undergoes synergistic treatment through a pH equalization tank, Fenton oxidation reactor, primary sedimentation tank, deep oxidation unit, secondary sedimentation tank, and multi-effect evaporator. This, combined with a material recycling system constructed by a sludge acid dissolution tank, trivalent iron sludge pipeline, and divalent iron sludge pipeline, reduces the generation of hazardous iron sludge and the amount of reagents required, lowers treatment costs, and improves the depth of wastewater treatment. Finally, wastewater resource utilization is achieved through a condensate recycling device and the recovery of industrial by-product salts. At the same time, the stable operation of each treatment unit is ensured, significantly improving treatment efficiency and resource utilization. Attached Figure Description

[0013] Figure 1 A schematic diagram of the main structure of a dye intermediate production wastewater treatment device provided by this utility model; Figure 2 This is a schematic diagram of the front sectional view of the present invention; Figure 3 for Figure 2An enlarged structural diagram of part A shown in the figure; Figure 4 for Figure 2 The diagram shows an enlarged view of part B.

[0014] Attached reference numerals: 1. Raw water equalization tank; 2. pH equalization tank; 3. Fenton oxidation reactor; 4. Hydrogen peroxide storage tank; 5. Primary sedimentation tank; 6. Coagulant storage tank; 7. Ozone catalytic oxidation tank; 8. Ozone generator; 9. Electrocatalytic oxidation tank; 10. Secondary sedimentation tank; 11. Multi-effect evaporator; 12. Sludge acid dissolution tank; 13. Trivalent iron sludge pipeline; 14. Divalent iron sludge pipeline; 15. First rotating rod; 16. Agitator blade; 17. Aeration pipe; 18. Motor; 19. Speed ​​regulator; 20. First pulley; 21. First transmission belt; 22. Air guide shell; 23. Connecting pipe; 24. Second rotating rod; 25. Fan blade; 26. Second pulley; 27. Second transmission belt. Detailed Implementation

[0015] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0016] This utility model embodiment provides a device for treating wastewater from dye intermediate production, such as... Figure 1-4 As shown, the wastewater treatment device for dye intermediate production includes: a raw water conditioning tank 1, a pH conditioning tank 2, a Fenton oxidation reactor 3, a primary sedimentation tank 5, a deep oxidation unit, a secondary sedimentation tank 10, and a multi-effect evaporator 11, which are connected in sequence. The primary sedimentation tank 5 is connected to the deep oxidation unit through a sludge acid dissolution tank 12. The secondary sedimentation tank 10 is connected to the pH conditioning tank 2 through a divalent iron sludge pipeline 14. The multi-effect evaporator 11 is connected to a condensate recycling device. The raw water conditioning tank 1 is equipped with a stirring mechanism and an aeration mechanism, which are linked to achieve wastewater homogenization.

[0017] In this embodiment, the wastewater from the production of dye intermediates first enters the raw water equalization tank 1. The stirring mechanism and the aeration mechanism work together to fully mix the wastewater with the pollutants and salts in it, so that the water quality and quantity of the wastewater are homogenized and regulated, providing the basic conditions for the stable operation of subsequent treatment units. After homogenization, the wastewater enters the pH adjustment tank 2, Fenton oxidation reactor 3, and primary sedimentation tank 5 for pretreatment. The sludge produced in the primary sedimentation tank 5 is treated in the sludge acid dissolution tank 12 and then introduced into the deep oxidation unit. After the pollutants are degraded in the deep oxidation unit, the wastewater enters the secondary sedimentation tank 10 for sludge-water separation. The precipitate produced in the secondary sedimentation tank 10 is returned to the pH adjustment tank 2 for recycling through the divalent iron sludge pipeline 14. The supernatant from the secondary sedimentation tank 10 enters the multi-effect evaporator 11 for evaporation and desalination. The condensate after desalination is recovered through the condensate recycling device, and the salt in the wastewater is converted into usable industrial by-product salt. The entire device reduces the generation of by-products during the treatment process and lowers the treatment cost through the coordinated cooperation and material recycling of each unit, while improving the wastewater treatment effect and resource utilization rate.

[0018] In a further preferred embodiment of this utility model, the stirring mechanism includes: a motor 18 and a speed regulator 19 disposed on one side of the raw water regulating tank 1, wherein the output shaft of the motor 18 and the input shaft of the speed regulator 19 are connected by a coupling; a first rotating rod 15 rotatably mounted in the raw water regulating tank 1 via a sealed bearing seat; stirring blades 16 fixed on the first rotating rod 15 for breaking up the wastewater stratification structure and promoting the mixing of pollutants with water; a first pulley 20 respectively fixed on the output shaft of the speed regulator 19 and the first rotating rod 15; and a first transmission belt 21 sleeved on the first pulley 20.

[0019] In this embodiment, the motor 18 is started, and the output shaft of the motor 18 drives the speed regulator 19 to run through the coupling. The speed regulator 19 transmits power through the first pulley 20 and the first transmission belt 21, which drives the first rotating rod 15 in the raw water regulating tank 1 to rotate. When the first rotating rod 15 rotates, it drives the stirring blade 16 to operate synchronously. The stirring blade 16 stirs the wastewater in the raw water regulating tank 1, breaks up the possible stratified structure of the wastewater, and promotes the full mixing of high-concentration pollutants, salts and water. The stirring mechanism achieves stable operation through multi-stage power transmission, improves the homogenization effect of wastewater, and provides conditions for subsequent processes such as pH adjustment in pH adjustment tank 2 and oxidation reaction in Fenton oxidation reactor 3. This helps to reduce fluctuations in reagent dosage and improve overall treatment efficiency.

[0020] In a further preferred embodiment of this utility model, the aeration mechanism includes: an aeration pipe 17 fixed in the raw water regulating tank 1 by a bracket; an air guide shell 22 disposed on one side of the raw water regulating tank 1, the air outlet of the air guide shell 22 being fixedly connected to the aeration pipe 17 through a connecting pipe 23; a second rotating rod 24 rotatably mounted in the air guide shell 22 by a bearing, a fan blade 25 fixed on the second rotating rod 24, the fan blade 25 rotating to generate airflow which is transported to the aeration pipe 17 through the connecting pipe 23 for introducing air into the wastewater to enhance the mixing effect; a second pulley 26 fixed on the output shaft of the second rotating rod 24 and the speed regulator 19, and a second transmission belt 27 sleeved on the second pulley 26.

[0021] In this embodiment, the wastewater from the production of dye intermediates to be treated first enters the raw water equalization tank 1. The stirring mechanism and the aeration mechanism work together to fully mix the wastewater with the pollutants and salts in the tank, so as to achieve homogenization and equalization of the wastewater quality and quantity, laying a stable foundation for subsequent treatment processes. After homogenization, the wastewater enters the pH adjustment tank 2, Fenton oxidation reactor 3, and primary sedimentation tank 5 for pretreatment. The sludge produced in the primary sedimentation tank 5 is treated in the sludge acid dissolution tank 12 and then introduced into the deep oxidation unit. After the pollutants are degraded in the deep oxidation unit, the wastewater enters the secondary sedimentation tank 10 for sludge-water separation. The precipitate produced in the secondary sedimentation tank 10 is returned to the pH adjustment tank 2 for recycling through the divalent iron sludge pipeline 14. The supernatant from the secondary sedimentation tank 10 enters the multi-effect evaporator 11 for evaporation and desalination. The condensate after desalination is recycled through the condensate recycling device to realize the resource utilization of wastewater. The entire device reduces the generation of by-products during the treatment process and lowers the treatment cost through the coordinated cooperation of each unit and the material cycle, while improving the wastewater treatment effect and resource utilization rate.

[0022] In a further preferred embodiment of this invention, the deep oxidation unit includes: an ozone catalytic oxidation tank 7 and an electrocatalytic oxidation tank 9 connected in sequence. The ozone catalytic oxidation tank 7 is connected to an ozone generator 8. The anode plate of the electrocatalytic oxidation tank 9 is a titanium-coated electrode, and the cathode is a titanium mesh electrode. The electrode spacing is 3-10 cm, and the current density is 5-20 mA / cm². 2 The deep oxidation unit is used to degrade organic matter in wastewater in stages and reduce color and ammonia nitrogen content.

[0023] In this embodiment, the wastewater pretreated by the sedimentation tank 5 enters the ozone catalytic oxidation tank 7. The ozone generator 8 adds ozone into the tank. Under the catalytic action of the residual iron ions in the wastewater, the organic matter is oxidized and decomposed, and the dissolved oxygen concentration in the wastewater is increased, providing favorable conditions for the subsequent electrocatalytic oxidation process. The wastewater after ozone catalytic oxidation treatment flows into electrocatalytic oxidation tank 9. Under the set electrode spacing and current density, the anode plate oxidizes and decomposes the organic matter in the wastewater, and the cathode uses high dissolved oxygen to generate hydrogen peroxide. At the same time, it reduces the introduced ferric iron to ferrous iron, forming a Fenton-like reaction system. The deep oxidation unit gradually reduces the organic matter content and color of wastewater through the synergistic effect of ozone catalytic oxidation and electrocatalytic oxidation, reduces pollutants such as ammonia nitrogen, improves the wastewater treatment effect, and provides high-quality influent for the subsequent sludge-water separation in the secondary sedimentation tank 10 and the evaporation and desalination in the multi-effect evaporator 11, thus helping to realize the resource utilization of wastewater.

[0024] In a further preferred embodiment of this utility model, the Fenton oxidation reactor 3 is connected to a hydrogen peroxide storage tank 4, and the primary sedimentation tank 5 is connected to a coagulant aid storage tank 6, which stores polyacrylamide.

[0025] In this embodiment, the wastewater after pH adjustment tank 2 enters Fenton oxidation reactor 3. Hydrogen peroxide storage tank 4 adds hydrogen peroxide into the tank through metering pump, which reacts with iron ions in the wastewater to undergo Fenton oxidation reaction, thus performing preliminary degradation of organic matter. The wastewater after Fenton oxidation treatment flows into the primary sedimentation tank 5. Polyacrylamide is added to the tank in the coagulant storage tank 6, and liquid alkali is added at the same time to adjust the pH. The polyacrylamide plays a flocculation role, which promotes the agglomeration of suspended particles and pollutants in the water to form sediment. The setup of hydrogen peroxide storage tank 4 and coagulant storage tank 6 makes the reagent dosing process convenient and controllable. The synergistic effect of Fenton oxidation and flocculation sedimentation achieves efficient separation of pollutants, reduces the pollutant load of subsequent treatment units, and creates favorable conditions for deep oxidation treatment.

[0026] In a further preferred embodiment of this utility model, the sludge acid dissolution tank 12 is connected to the electrocatalytic oxidation tank 9 through the trivalent iron sludge pipeline 13, and is used to acid dissolve the iron hydroxide sludge produced by the primary sedimentation tank 5 and then introduce it into the electrocatalytic oxidation tank 9 to reduce it to divalent iron, thereby realizing the recycling of iron ions.

[0027] In this embodiment, the ferric hydroxide sludge produced in the primary sedimentation tank 5 enters the sludge acid dissolution tank 12, where acid is added to dissolve the sludge and form a solution containing ferric iron. A solution containing ferric iron is introduced into the electrocatalytic oxidation cell 9 through the ferric iron mud pipeline 13. Under the cathodic reduction of the electrocatalytic oxidation cell 9, ferric iron is converted into ferrous iron. This interconnected structure enables the recycling of iron ions, reduces the amount of external iron-based reagents required, lowers treatment costs, and reduces the generation of hazardous iron sludge. It also provides continuous catalyst support for the stable operation of the Fenton oxidation reactor 3, enhancing the synergistic treatment effect of the process.

[0028] In a further preferred embodiment of this utility model, the ozone addition method of the ozone catalytic oxidation tank 7 is jet injection. The ozone catalytic oxidation tank 7 is used to oxidize and decompose organic matter under the catalysis of residual iron ions and increase the dissolved oxygen concentration of wastewater.

[0029] In this embodiment, the supernatant after being treated in the primary sedimentation tank 5 enters the ozone catalytic oxidation tank 7. The ozone generator 8 adds ozone into the tank in a jet manner, allowing the wastewater to maintain a hydraulic residence time of 30-120 minutes in the tank. Under the catalytic effect of residual iron ions in the wastewater, ozone reacts with organic matter in the wastewater to gradually decompose the organic matter, while increasing the dissolved oxygen concentration in the wastewater, creating favorable conditions for the subsequent reaction in the electrocatalytic oxidation tank 9. This setup, through a specific combination of ozone addition methods, concentrations, and residence times, enhances the reaction efficiency between ozone and wastewater, helps reduce the COD content and color of wastewater, provides water quality assurance for subsequent advanced treatment, and promotes the stable operation of the overall treatment process.

[0030] In summary, compared with related technologies, the wastewater homogenization achieved through the linkage of the stirring and aeration mechanisms in the raw water equalization tank 1, followed by synergistic treatment through the pH equalization tank 2, Fenton oxidation reactor 3, primary sedimentation tank 5, deep oxidation unit, secondary sedimentation tank 10, and multi-effect evaporator 11, combined with the material recycling system constructed by the sludge acid dissolution tank 12, trivalent iron sludge pipeline 13, and divalent iron sludge pipeline 14, not only reduces the generation of hazardous iron sludge and the amount of reagents added, thus lowering treatment costs, but also improves the depth of wastewater treatment. Finally, the wastewater is recycled through the condensate reuse device and the recovery of industrial by-product salts, while ensuring the stable operation of each treatment unit, significantly improving treatment efficiency and resource utilization.

[0031] It is worth noting that the circuits, electronic components, and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the software and methods.

[0032] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus may be implemented in other ways.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on these embodiments, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Although this utility model has been described in detail with reference to the above embodiments, those skilled in the art can still combine, add, delete, or otherwise adjust the features of the various embodiments of this utility model according to the circumstances without conflict, thereby obtaining different technical solutions that do not fundamentally depart from the concept of this utility model. These technical solutions also fall within the scope of protection of this utility model.

Claims

1. A treatment device for wastewater from the production of dye intermediates, characterized in that, include: The raw water conditioning tank, pH conditioning tank, Fenton oxidation reactor, primary sedimentation tank, deep oxidation unit, secondary sedimentation tank and multi-effect evaporator are connected in sequence. The primary sedimentation tank is connected to the deep oxidation unit via a sludge acid dissolution tank. The secondary sedimentation tank is connected to the pH adjustment tank via a divalent iron sludge pipeline; The multi-effect evaporator is connected to a condensate recycling device; The raw water regulating tank is equipped with a stirring mechanism and an aeration mechanism, which are linked together to achieve wastewater homogenization.

2. The treatment apparatus for dye intermediate production wastewater as described in claim 1, characterized in that, The stirring mechanism includes: A motor and a speed regulator are installed on one side of the raw water regulating tank, and the output shaft of the motor and the input shaft of the speed regulator are connected by a coupling. The first rotating rod, which is rotatably installed in the raw water regulating tank, is rotatably mounted via a sealed bearing seat. A stirring blade fixed to the first rotating rod; The first pulleys are respectively fixed on the output shaft of the speed regulator and the first rotating rod; The first transmission belt is fitted onto the first pulley.

3. The treatment apparatus for dye intermediate production wastewater as described in claim 1, characterized in that, The aeration mechanism includes: The aeration pipe is fixed in the raw water regulating tank by a bracket; An air guide shell is installed on one side of the raw water regulating tank, and the air outlet of the air guide shell is fixedly connected to the aeration pipe through a connecting pipe. A second rotating rod is rotatably mounted inside the air guide shell via a bearing. A fan blade is fixed on the second rotating rod. The fan blade rotates to generate airflow, which is then transported to the aeration pipe via a connecting pipe for introducing air into the wastewater. The second rotating rod is fixed to the output shaft of the speed regulator with a second pulley, and a second transmission belt is fitted on the second pulley.

4. The treatment apparatus for dye intermediate production wastewater as described in claim 1, characterized in that, The deep oxidation unit includes an ozone catalytic oxidation tank and an electrocatalytic oxidation tank connected in sequence. The ozone catalytic oxidation tank is connected to an ozone generator. The anode plate of the electrocatalytic oxidation tank is a titanium-coated electrode, and the cathode is a titanium mesh electrode.

5. The treatment apparatus for dye intermediate production wastewater as described in claim 1, characterized in that, The Fenton oxidation reactor is connected to a hydrogen peroxide storage tank, and the primary sedimentation tank is connected to a coagulant aid storage tank, which stores polyacrylamide.

6. The treatment apparatus for dye intermediate production wastewater as described in claim 1, characterized in that, The sludge acid dissolution tank is connected to the electrocatalytic oxidation tank via a ferric sludge pipeline. It is used to dissolve the ferric hydroxide sludge produced in the primary sedimentation tank and then introduce it into the electrocatalytic oxidation tank to reduce it to ferrous iron.

7. The treatment apparatus for dye intermediate production wastewater as described in claim 4, characterized in that, The ozone catalytic oxidation tank is injected with ozone via jet. The ozone catalytic oxidation tank is used to oxidize and decompose organic matter under the catalysis of residual iron ions and increase the dissolved oxygen concentration in wastewater.

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