A wastewater treatment system for preparing 4-trifluoromethylnicotinic acid

Abstract

The utility model relates to chemical production technology, show a kind of wastewater treatment system of preparation 4-trifluoromethyl nicotinic acid, including the grid pool that connects gradually, adjusting pool, pH adjusting pool, coagulation sedimentation tank, advanced treatment device, clean water pool and sludge treatment device, the water outlet of grid pool connects the water inlet of adjusting pool, the water outlet of adjusting pool connects the water inlet of pH adjusting pool, the water outlet of pH adjusting pool connects the water inlet of coagulation sedimentation tank, the clean water outlet of coagulation sedimentation tank connects the water inlet of advanced treatment device, the water outlet of advanced treatment device connects clean water pool, the sludge outlet of coagulation sedimentation tank connects sludge treatment device, and the wastewater treatment system of the utility model uses multistage processing technology, designs according to the wastewater characteristics of preparation 4-trifluoromethyl nicotinic acid, can efficiently handle high fluorine content, component complex wastewater, and treatment effect is stable and reliable, and effluent quality can reach national discharge standard or reuse requirement.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and more specifically, to a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid. Background Technology

[0002] The production process of 4-trifluoromethylnicotinic acid generates a large amount of wastewater, mainly including reaction mother liquor (such as wastewater from cyclization and hydrolysis processes), equipment cleaning water, and extraction and separation wastewater. This wastewater is characterized by high fluoride content, complex composition, and the presence of recalcitrant organic fluorides. It may also contain acidic substances such as sulfuric acid and hydrochloric acid, as well as pyridine derivatives. Traditional wastewater treatment methods are ineffective in treating this type of wastewater, resulting in high treatment costs and unsatisfactory treatment effects. Therefore, a highly efficient, economical, and environmentally friendly wastewater treatment system is needed to address these problems. Utility Model Content

[0003] This application provides a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid, which solves the problems of traditional wastewater treatment methods being unable to effectively treat this type of wastewater, and having high treatment costs and unsatisfactory treatment effects.

[0004] This application provides a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid, comprising a bar screen, an equalization tank, a pH equalization tank, a coagulation sedimentation tank, a deep treatment device, a clear water tank, and a sludge treatment device connected in sequence. The outlet of the bar screen is connected to the inlet of the equalization tank, the outlet of the equalization tank is connected to the inlet of the pH equalization tank, the outlet of the pH equalization tank is connected to the inlet of the coagulation sedimentation tank, the clear water outlet of the coagulation sedimentation tank is connected to the inlet of the deep treatment device, the outlet of the deep treatment device is connected to the clear water tank, and the sludge outlet of the coagulation sedimentation tank is connected to the sludge treatment device.

[0005] Preferably, both the conditioning tank and the pH conditioning tank are equipped with a stirring device.

[0006] Preferably, a liquid level sensor is installed in the regulating tank.

[0007] Preferably, the pH adjustment tank is equipped with a pH sensor.

[0008] Preferably, the deep treatment device is an ion exchange resin column.

[0009] Preferably, the sludge treatment device includes a sludge thickening tank, a sludge pump, and a plate and frame filter press.

[0010] Preferably, it also includes a controller, which is electrically connected to the stirring device, the liquid level sensor and the pH sensor.

[0011] Preferably, the equalization tank and the pH equalization tank are connected to the waste gas treatment system via pipelines.

[0012] As can be seen from the above technical solution, this application provides a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid. In use, the wastewater first enters a grit chamber, where solid residues are intercepted by the grit chamber to prevent clogging of subsequent equipment. It then flows into an equalization tank, where it undergoes homogenization and equalization treatment by a stirring device. A level sensor controls the influent and effluent flow rates to ensure stable water quality and quantity. After entering a pH adjustment tank, the stirring device thoroughly mixes the wastewater with calcium hydroxide or calcium chloride. A pH sensor monitors in real time and automatically adjusts the dosage of the reagent to stabilize the pH value at 6-8. Simultaneously, a chemical reaction achieves preliminary removal of fluoride ions through pretreatment. The pretreated wastewater then enters a coagulation sedimentation tank, where the inclined plate sedimentation unit enhances separation efficiency, further removing fluoride ions from the wastewater. Chemical sediments and suspended solids settle rapidly, and the sludge is discharged into the sludge treatment unit through the outlet. In the sludge treatment unit, the sludge is first concentrated in the sludge thickening tank, and then transported to the plate and frame filter press for dewatering and drying by the sludge pump, so that the sludge moisture content is reduced to below 60%. The qualified sludge can be safely landfilled or utilized as a resource. The supernatant of the coagulation sedimentation tank enters the deep treatment unit, where residual fluoride ions are deeply removed through the ion exchange action of the strong acid cation exchange resin column. The treated water that meets the standards is discharged into the clear water tank and can be directly discharged into the municipal sewage network or reused in the equipment cleaning process. The entire system is coordinated by a controller, which automatically controls the operation of actuators such as the stirring device based on data from pH sensor and liquid level sensor, realizing fully automated and precise treatment.

[0013] Compared with the prior art, the beneficial effects of this utility model are: 1. The wastewater treatment system of this utility model adopts a multi-stage treatment process and is designed for the characteristics of wastewater prepared from 4-trifluoromethylnicotinic acid. It can efficiently treat wastewater with high fluoride content and complex composition, and the treatment effect is stable and reliable. The effluent quality can meet the national discharge standards or reuse requirements.

[0014] 2. This utility model achieves automatic adjustment and precise control of wastewater pH by setting up a stirring device and pH sensor in the pH adjustment tank, which improves the effect of defluorination pretreatment, reduces the load on subsequent treatment units, and reduces the dosage of calcium hydroxide or calcium chloride, thus saving treatment costs.

[0015] 3. The advanced treatment device of this utility model adopts an ion exchange resin column, which can effectively remove residual fluoride ions and ensure that the wastewater treatment meets the standards. At the same time, the ion exchange resin column has the advantages of simple operation, stable operation and low maintenance cost.

[0016] 4. This utility model system is equipped with a sludge treatment device to dewater and dry the sludge, thereby reducing the volume and rendering the sludge harmless, avoiding secondary pollution of the sludge, and allowing the dried sludge to be safely landfilled or recycled, thus improving resource utilization.

[0017] 5. The application of this utility model controller realizes the automated operation of the entire wastewater treatment system, improves the system's operating efficiency and stability, reduces the intensity and error of manual operation, and facilitates the monitoring and management of operators.

[0018] 6. The design of the bar screen and equalization tank of this utility model can effectively intercept solid residues in wastewater, stabilize water quality and quantity, provide a guarantee for the stable operation of subsequent treatment units, and improve the impact resistance of the entire system.

[0019] In summary, a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid employs a multi-stage treatment process and is designed specifically for the characteristics of wastewater from the preparation of 4-trifluoromethylnicotinic acid. It can efficiently treat wastewater with high fluoride content and complex composition, with stable and reliable treatment results, and the effluent quality can meet national discharge standards or reuse requirements. Attached Figure Description

[0020] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0021] Figure 1 This is a schematic diagram of a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid provided by this utility model; Figure 2 This is a partial schematic diagram of a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid provided by this utility model; Figure 3 This is a schematic diagram of the control system in a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid provided by this utility model.

[0022] The reference numerals in the detailed embodiments are as follows: 1. Bar screen; 2. Equalization tank; 3. pH equalization tank; 4. Coagulation sedimentation tank; 5. Advanced treatment device; 6. Clear water tank; 7. Sludge treatment device; 71. Sludge thickening tank; 72. Sludge pump; 73. Plate and frame filter press; 8. Controller; 9. Agitator; 10. Liquid level sensor; 11. pH sensor; 12. Ion exchange resin column; 13. Waste gas treatment system. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0024] See Figure 1-3 This application discloses a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid. To address the problems of traditional wastewater treatment methods being ineffective in treating this type of wastewater, resulting in high treatment costs and unsatisfactory treatment effects, this application proposes a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid. This system employs a multi-stage treatment process and is designed specifically for the characteristics of wastewater from the preparation of 4-trifluoromethylnicotinic acid. It can efficiently treat wastewater with high fluoride content and complex composition, with stable and reliable treatment effects, and the effluent quality can meet national discharge standards or reuse requirements.

[0025] Specifically, a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid includes a screen tank 1, an equalization tank 2, a pH equalization tank 3, a coagulation sedimentation tank 4, a deep treatment device 5, a clear water tank 6, and a sludge treatment device 7 connected in sequence. The screen gap of the screen tank 1 is 5-10 mm, which can effectively intercept solid residues in the wastewater and prevent solid residues from entering subsequent treatment units and affecting the treatment effect. The outlet of the screen tank 1 is connected to the inlet of the equalization tank 2, which is used to homogenize and equalize the wastewater. The outlet of the equalization tank 2 is connected to the inlet of the pH equalization tank 3, which is used to adjust the pH value of the wastewater and perform defluorination pretreatment. Both the equalization tank 2 and the pH equalization tank 3 are equipped with a stirring device 9, which is used to fully mix the wastewater with calcium hydroxide or calcium chloride. The equalization tank 2 is equipped with a stirring device 9. A liquid level sensor 10 is provided to monitor the liquid level in the equalization tank in real time. The liquid level sensor 10 automatically controls the influent and effluent flow of wastewater according to the liquid level to ensure the stability of water quality and quantity in the equalization tank 2. A pH sensor 11 is provided in the pH equalization tank 3 to monitor the pH value of the wastewater in real time. The pH sensor 11 automatically controls the dosage of calcium hydroxide or calcium chloride according to the monitoring results to ensure that the pH value of the wastewater is stable between 6 and 8. The outlet of the pH equalization tank 3 is connected to the inlet of the coagulation sedimentation tank 4. Coagulants such as polyaluminum chloride and polyacrylamide are added to the coagulation sedimentation tank 4. The separation efficiency is enhanced by using inclined plate sedimentation units with a spacing of 20-50mm and an inclination angle of 45-60° to make the fluoride precipitates and suspended solids in the wastewater settle quickly, and further remove the fluoride and suspended solids in the wastewater. The clear water outlet of the coagulation sedimentation tank 4 is connected to the inlet of the advanced treatment device 5. The advanced treatment device 5 is used to remove residual fluoride ions. The advanced treatment device 5 is an ion exchange resin column 12, which is filled with a strong acidic cation exchange resin. The ion exchange resin column 12 can effectively remove residual fluoride ions, ensuring that the wastewater treatment meets the standards. The outlet of the advanced treatment device 5 is connected to the clear water tank 6, which is used to collect the treated clear water. After meeting the standards, it can be discharged into the municipal sewage network or reused in the equipment cleaning process. The sludge outlet of the coagulation sedimentation tank 4 is connected to the sludge treatment device 7. The sludge treatment device 7 includes a sludge thickening tank 71, a sludge pump 72, and a plate and frame filter press 73. The sludge thickening tank 71 is used to initially thicken the sludge, and the sludge pump 72 is used to transport the thickened sludge. The sludge is dewatered and dried by a plate and frame filter press 73, which can dewater the sludge to a moisture content of less than 60%. The dried sludge can be safely landfilled or recycled. This wastewater treatment system also includes a controller 8, which is used to realize the automated operation of the entire wastewater treatment system. The controller 8 is electrically connected to the stirring device 9, the liquid level sensor 10 and the pH sensor 11. The entire system is coordinated by the controller 8. Based on the data from the pH sensor 11 and the liquid level sensor 10, the controller automatically controls the operation of actuators such as the stirring device 9 to achieve fully automated and precise treatment. The equalization tank 2 and the pH equalization tank 3 are connected to the waste gas treatment system 13 through pipelines. The waste gas generated in the equalization tank 2 and the pH equalization tank 3 enters the waste gas treatment system 13 through pipelines for centralized treatment and is discharged after meeting the standards.

[0026] As can be seen from the above technical solution, in the use of a wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid, the wastewater first enters the screen tank 1, where the screen intercepts solid residues to prevent clogging of subsequent equipment. It then flows into the equalization tank 2, where it is homogenized and treated by the stirring device 9. The level sensor 10 controls the influent and effluent flow rates to ensure stable water quality and quantity. After entering the pH equalization tank 3, the stirring device 9 thoroughly mixes the wastewater with calcium hydroxide or calcium chloride. The pH sensor 11 monitors in real time and automatically adjusts the dosage of the reagent to stabilize the pH value at 6-8. Simultaneously, a chemical reaction is used to achieve preliminary removal of fluoride ions as a pretreatment. The pretreated wastewater then enters the coagulation sedimentation tank 4, where the inclined plate sedimentation unit enhances the separation efficiency, causing the fluoride in the wastewater to precipitate. The solids and suspended matter settle rapidly, and the sludge is discharged into the sludge treatment device 7 through the outlet. In the sludge treatment device 7, the sludge is first concentrated in the sludge thickening tank 71, and then transported to the plate and frame filter press 73 for dewatering and drying through the sludge pump 72, so that the sludge moisture content is reduced to below 60%. The qualified sludge can be safely landfilled or utilized as a resource. The supernatant of the coagulation sedimentation tank 4 enters the deep treatment device 5, where residual fluoride ions are deeply removed through the ion exchange action of the strong acid cation exchange resin column 12. The treated water that meets the standards flows into the clear water tank 6, which can be directly discharged into the municipal sewage network or reused in the equipment cleaning process. The entire system is coordinated by the controller 8, which automatically controls the operation of actuators such as the stirring device 9 based on the data of the pH sensor 11 and the liquid level sensor 10, so as to realize the full-process automation and precise treatment.

[0027] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and incorporate common knowledge or customary techniques in the art disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0028] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid, characterized in that: The system includes a screen tank (1), an equalization tank (2), a pH equalization tank (3), a coagulation sedimentation tank (4), a deep treatment device (5), a clear water tank (6), and a sludge treatment device (7) connected in sequence. The outlet of the screen tank (1) is connected to the inlet of the equalization tank (2), the outlet of the equalization tank (2) is connected to the inlet of the pH equalization tank (3), the outlet of the pH equalization tank (3) is connected to the inlet of the coagulation sedimentation tank (4), the clear water outlet of the coagulation sedimentation tank (4) is connected to the inlet of the deep treatment device (5), the outlet of the deep treatment device (5) is connected to the clear water tank (6), and the sludge outlet of the coagulation sedimentation tank (4) is connected to the sludge treatment device (7).

2. The wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid according to claim 1, characterized in that: Both the conditioning tank (2) and the pH conditioning tank (3) are equipped with stirring devices (9).

3. The wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid according to claim 2, characterized in that: A liquid level sensor (10) is installed in the regulating tank (2).

4. The wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid according to claim 3, characterized in that: The pH adjustment tank (3) is equipped with a pH sensor (11).

5. The wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid according to claim 1, characterized in that: The deep processing device (5) is an ion exchange resin column (12).

6. The wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid according to claim 1, characterized in that: The sludge treatment device (7) includes a sludge thickening tank (71), a sludge pump (72), and a plate and frame filter press (73).

7. The wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid according to claim 4, characterized in that: It also includes a controller (8), which is electrically connected to the stirring device (9), the liquid level sensor (10) and the pH sensor (11).

8. The wastewater treatment system for the preparation of 4-trifluoromethylnicotinic acid according to claim 1, characterized in that: The equalization tank (2) and the pH equalization tank (3) are connected to the waste gas treatment system (13) via pipelines.

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