Fluorine-containing wastewater treatment system
By designing a fluorine-containing wastewater treatment system with a hierarchical treatment module, the problem of large fluctuations in the water quality of fluorine-containing wastewater in the production of high-purity quartz sand is solved, stable and efficient wastewater treatment is achieved, and environmental pollution is reduced. It is suitable for the production of high-purity quartz sand. Environmental protection requirements for the process.
Patent Information
- Application Number
- CN202421159408.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-24
- Publication Date
- 2025-02-07
- Estimated Expiration
- 2034-05-24
AI Technical Summary
The water quality of fluorine-containing wastewater generated in the production of high-purity quartz sand fluctuates greatly, and the traditional treatment system has poor impact load resistance, resulting in unstable treatment effect and it is difficult to achieve stable emissions according to standards.
A fluorine-containing wastewater treatment system was designed to treat different concentrations of fluorine-containing wastewater through a hierarchical treatment module (concentrated fluorine, dilute fluorine, primary and secondary treatment modules), including sand precipitation, regulation, reaction and filtration pressing steps. The dosing module is combined with lime milk and other chemical agents for fluoride removal treatment.
Through hierarchical treatment, we ensure that different concentrations of fluorine-containing wastewater are properly treated, which improves treatment efficiency and effect, reduces environmental pollution, and achieves stable emissions according to standards. Modular design is easy to maintain and manage.
Smart Images
Figure CN222434302U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of sewage treatment, in particular to a fluorine-containing wastewater treatment system. Background Art
[0002] High-purity quartz sand, due to its excellent stability, high insulation withstand voltage and extremely low volume expansion coefficient, has become an indispensable key raw material in high-tech industries such as semiconductors and photovoltaic new energy. Its wide application in integrated circuits, solar energy, aerospace and photovoltaics further highlights its importance. However, in the production process of high-purity quartz sand, especially in the purification and rinsing stages, a large amount of fluoride-containing wastewater will be generated. If directly discharged without proper treatment, these wastewaters will damage the surrounding ecological environment and pose a serious threat to the physical and mental health of residents.
[0003] At present, the treatment technology for fluoride-containing wastewater has been developed, and common treatment methods include lime precipitation method, adsorption method, etc. These methods show certain effects in treating fluoride-containing wastewater with relatively stable water quality and single composition. However, in the production process of high-purity quartz sand, due to the need to go through multiple rinsing processes after deacidification, the fluoride content in the wastewater fluctuates greatly. Specifically, the fluoride concentration in the wastewater generated by the first and second rinsing processes is relatively high, while the fluoride concentration in the wastewater generated by the third and fourth rinsing processes is relatively low. This fluctuation in water quality poses a great challenge to wastewater treatment.
[0004] When faced with such fluorine-containing wastewater, traditional wastewater treatment systems often have problems such as poor impact load resistance, unstable operation of equipment and facilities, and difficulty in achieving stable discharge standards after treatment. Therefore, in view of the large fluctuation range of the water quality of quartz sand pickling wastewater, it is urgent to develop a fluorine-containing wastewater treatment system that can adapt to different working conditions and ensure stable discharge standards. The research and development of this system is of great significance to improving the environmental performance of the high-purity quartz sand production process and protecting the surrounding ecological environment and residents' health.
[0005] In summary, the present application aims to provide an efficient treatment system for quartz sand pickling wastewater to solve the problems existing in the prior art, ensure the stable and standard discharge of fluorine-containing wastewater, and provide strong support for the sustainable development of related industries. Summary of the invention
[0006] The technical problem to be solved by the present application is how to treat the wastewater generated in the production of crystalline silicon solar cells to avoid environmental pollution and save water resources.
[0007] To achieve the above objectives, this application is implemented through the following technical solutions:
[0008] The present application provides a fluorine-containing wastewater treatment system, comprising:
[0009] A concentrated fluorine wastewater treatment module, the concentrated fluorine wastewater treatment module is connected to the concentrated fluorine wastewater outlet of the high-purity quartz sand treatment process, including a concentrated fluorine sand settling unit, a concentrated fluorine regulating unit, a concentrated fluorine reaction unit, and a first filter press unit, the concentrated fluorine wastewater outlet is sequentially connected to the concentrated fluorine sand settling unit, the concentrated fluorine regulating unit, and the concentrated fluorine reaction unit, and the slurry outlet pipeline of the concentrated fluorine reaction unit is connected to the first filter press unit;
[0010] A rare fluorine wastewater treatment module, the rare fluorine wastewater treatment module is connected to the rare fluorine wastewater drainage outlet of the high-purity quartz sand treatment process, including a rare fluorine sand settling unit and a rare fluorine regulating unit, the rare fluorine wastewater drainage outlet is sequentially connected to the rare fluorine sand settling unit and the rare fluorine regulating unit, the rare fluorine regulating unit is connected to the water outlet of the concentrated fluorine reaction unit through a valve, and the rare fluorine regulating unit is also connected to the water outlet of the first filter press unit through a pipeline;
[0011] A primary fluorine-containing wastewater treatment module, the primary fluorine-containing wastewater treatment module comprises a defluorination initial adjustment unit, a defluorination fine-tuning unit, a primary coagulation defluorination unit, a primary flocculation defluorination unit, a primary sand settling unit, a mud storage unit, and a second filter press unit, the water outlet of the dilute fluorine adjustment unit is sequentially connected to the defluorination initial adjustment unit, the defluorination fine-tuning unit, the primary coagulation defluorination unit, the primary flocculation defluorination unit, and the primary sand settling unit, and the mud outlet of the primary sand settling unit is sequentially connected to the mud storage unit and the second filter press unit;
[0012] A secondary fluorine-containing wastewater treatment module, the secondary fluorine-containing wastewater treatment module comprises a secondary pH value adjustment unit, a secondary coagulation and fluorine removal unit, a secondary flocculation and fluorine removal unit, a secondary grit unit, a mud storage unit, and a second filter press unit, the water outlet of the primary grit unit is sequentially connected to the secondary pH value adjustment unit, the secondary coagulation and fluorine removal unit, the secondary flocculation and fluorine removal unit, and the secondary grit unit, the water outlet pipe of the secondary grit unit is connected to the municipal pipe network, and the mud outlet of the secondary grit unit is sequentially connected to the mud storage unit and the second filter press unit;
[0013] The dosing module is respectively connected with the concentrated fluorine wastewater treatment module, the diluted fluorine wastewater treatment module, the primary fluorine-containing wastewater treatment module and the secondary fluorine-containing wastewater treatment module, and comprises a coagulant storage unit, an acid storage unit, a calcium chloride storage unit, a flocculant storage unit, a defluoridant storage unit and a lime milk storage unit.
[0014] As a further improvement of the present application, the concentrated fluorine regulating unit is connected to the diluted fluorine regulating unit by a pipeline.
[0015] As a further improvement of the present application, the mud outlet pipeline of the concentrated fluorine sand settling unit is connected to the high-purity quartz sand processing process.
[0016] As a further improvement of the present application, the mud outlet pipeline of the rare fluorine sand settling unit is connected to the high-purity quartz sand processing process.
[0017] As a further improvement of the present application, the water outlet pipe of the second filter press unit is connected to the dilute fluorine adjustment unit.
[0018] As a further improvement of the present application, the second filter press unit includes several filter presses.
[0019] As a further improvement of the present application, the concentrated fluorine sand settling unit includes a first box body for accommodating concentrated fluorine wastewater, and the bottom of the first box body is configured to be conical or sloped.
[0020] As a further improvement of the present application, the dilute fluorine sand settling unit includes a second box body for accommodating the dilute fluorine wastewater, and the bottom of the second box body is configured to be conical or sloped.
[0021] As a further improvement of the present application, the primary sand settling unit includes a third box for accommodating primary treated fluorine-containing wastewater, and the bottom of the third box is configured to be conical or sloped.
[0022] As a further improvement of the present application, the secondary sand settling unit includes a fourth box body for accommodating secondary treated fluorine-containing wastewater, and the bottom of the fourth box body is configured to be conical or sloped.
[0023] The beneficial effect of the present application is that the fluorine-containing wastewater treatment system provided by the present application can ensure that fluorine-containing wastewater of different concentrations is properly treated by graded treatment of concentrated fluorine and diluted fluorine wastewater, thereby improving the treatment efficiency and treatment effect and reducing the pollution to the environment. The modular design makes maintenance and management more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] Figure 1 This is a schematic diagram of the process structure of the fluorine-containing wastewater treatment system of the present application. DETAILED DESCRIPTION
[0025] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in combination with the specific embodiments and drawings of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments, and are not used to limit the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.
[0026] For the fluorine-containing wastewater discharged from the high-purity quartz sand production process, the existing treatment technology has the problems of poor impact load resistance, unstable operation of equipment and facilities, and difficulty in stably meeting the discharge standards of the treated effluent. In order to solve the above problems, this application provides a fluorine-containing wastewater treatment system, such as Figure 1 As shown, including:
[0027] A concentrated fluorine wastewater treatment module, the concentrated fluorine wastewater treatment module is connected to the concentrated fluorine wastewater discharge port of the high-purity quartz sand treatment process, and is used to receive and treat the concentrated fluorine wastewater generated by the high-purity quartz sand treatment process, including a concentrated fluorine sand settling unit, a concentrated fluorine regulating unit, a concentrated fluorine reaction unit, and a first filter press unit. The concentrated fluorine wastewater discharge port is sequentially connected to the concentrated fluorine sand settling unit, the concentrated fluorine regulating unit, and the concentrated fluorine reaction unit. The mud outlet pipeline of the concentrated fluorine reaction unit is connected to the first filter press unit; the function of the concentrated fluorine sand settling unit is to remove the sand carried in the concentrated fluorine wastewater, the function of the concentrated fluorine regulating unit is to regulate the water volume and water quality in the concentrated fluorine wastewater, the concentrated fluorine reaction unit is mainly to add lime milk to the concentrated fluorine wastewater, and the lime milk reacts with the fluoride ions in the concentrated fluorine wastewater to generate calcium fluoride, thereby greatly reducing the fluoride ions in the concentrated fluorine wastewater. The first filter press unit can be but is not limited to a plate and frame filter press, and its main function is to dehydrate the mud discharged from the concentrated fluorine reaction unit.
[0028] A rare fluorine wastewater treatment module, the rare fluorine wastewater treatment module is connected to the rare fluorine wastewater discharge outlet of the high-purity quartz sand treatment process, including a rare fluorine sand settling unit and a rare fluorine regulating unit, the rare fluorine wastewater discharge outlet is connected to the rare fluorine sand settling unit and the rare fluorine regulating unit in sequence, the rare fluorine regulating unit is connected to the water outlet of the concentrated fluorine reaction unit through a valve, and the rare fluorine regulating unit is also connected to the water outlet of the first filter press unit through a pipeline; the function of the rare fluorine sand settling unit is to remove sand carried in the rare fluorine wastewater, the function of the rare fluorine regulating unit is to collect the effluent of the concentrated fluorine reaction unit after fluorine removal and the effluent of the first filter press unit, and the function of the rare fluorine regulating unit also includes regulating the water quantity and water quality in the rare fluorine wastewater.
[0029] A primary fluorine-containing wastewater treatment module, the primary fluorine-containing wastewater treatment module includes a defluorination initial adjustment unit, a defluorination fine-tuning unit, a primary coagulation defluorination unit, a primary flocculation defluorination unit, a primary sand settling unit, a mud storage unit, and a second filter press unit. The water outlet of the dilute fluorine adjustment unit is sequentially connected to the defluorination initial adjustment unit, the defluorination fine-tuning unit, the primary coagulation defluorination unit, the primary flocculation defluorination unit, and the primary sand settling unit. The mud outlet of the primary sand settling unit is sequentially connected to the mud storage unit and the second filter press unit. The function of the defluorination initial adjustment unit is to remove most of the fluoride in the dilute fluoride wastewater by adding lime milk, and the function of the defluorination fine-tuning unit is to remove a small part of the fluoride in the dilute fluoride wastewater by adding lime milk again. The cooperation of the defluorination initial adjustment unit and the defluorination fine-tuning unit can achieve accurate dosing, avoid waste of drugs and increase the amount of sludge. The primary coagulation defluorination unit and the primary flocculation defluorination unit capture calcium fluoride by adding coagulants and flocculants respectively to form larger flocs, so as to facilitate rapid precipitation in the primary sand settling tank. The primary sand settling unit is the terminal treatment in the primary fluorine-containing wastewater treatment module, which is convenient for separating the fluorine-containing wastewater from the mud.
[0030] A secondary fluorine-containing wastewater treatment module, the secondary fluorine-containing wastewater treatment module includes a secondary pH value adjustment unit, a secondary coagulation and defluorination unit, a secondary flocculation and defluorination unit, a secondary sand settling unit, a mud storage unit, and a second filter press unit. The outlet of the primary sand settling unit is sequentially connected to the secondary pH value adjustment unit, the secondary coagulation and defluorination unit, the secondary flocculation and defluorination unit, and the secondary sand settling unit. The outlet pipe of the secondary sand settling unit is connected to the municipal pipe network. The mud outlet of the secondary sand settling unit is sequentially connected to the mud storage unit and the second filter press unit. The secondary defluorination pH adjustment unit uses calcium chloride for defluorination. Calcium chloride is in a dissolved state and has better dispersibility. It is suitable for low-concentration fluorine-containing wastewater treatment and can also be accurately added. The role of pH adjustment is to create conditions for subsequent coagulation and sedimentation. The secondary coagulation and defluorination unit and the secondary flocculation and defluorination unit mainly capture calcium fluoride by adding coagulants and flocculants to form larger flocs, so as to facilitate rapid precipitation in the secondary sand settling tank. The function of the secondary grit unit is to separate the fluorine-containing wastewater from the mud. The function of the mud storage unit is to collect the mud discharged from the secondary grit unit and homogenize it so as to facilitate its introduction into the second filter press unit. The function of the second filter press unit is to filter the mud so as to handle solid waste.
[0031] A dosing module, which is respectively connected to the concentrated fluorine wastewater treatment module, the dilute fluorine wastewater treatment module, the primary fluorine-containing wastewater treatment module and the secondary fluorine-containing wastewater treatment module, and includes a coagulant storage unit, an acid storage unit, a calcium chloride storage unit, a flocculant storage unit, a defluoridation agent storage unit and a lime milk storage unit. The dosing module is used to add drugs to the concentrated fluorine wastewater treatment module, the dilute fluorine wastewater treatment module, the primary fluorine-containing wastewater treatment module and the secondary fluorine-containing wastewater treatment module to treat fluoride in the fluoride-containing wastewater.
[0032] The above-mentioned fluorine-containing wastewater treatment system effectively treats the concentrated fluorine wastewater and dilute fluorine wastewater generated in the high-purity quartz sand treatment process by means of graded treatment. The system structure is clear, and the modular design makes maintenance and management more convenient. Graded treatment can ensure that fluorine-containing wastewater of different concentrations is properly treated, improves the treatment efficiency and effect, and reduces pollution to the environment. Specifically, the concentrated fluorine wastewater is removed from most of the fluorides and other impurities through the steps of sand settling, adjustment, reaction and filter pressing; the dilute fluorine wastewater is mixed with part of the wastewater from the concentrated fluorine adjustment unit and the effluent from the filter pressing unit after sand settling and adjustment, and enters the next level of treatment, realizing the full utilization and resource utilization of wastewater.
[0033] In an optional embodiment, the concentrated fluorine adjustment unit is connected to the dilute fluorine adjustment unit by a pipeline, which is beneficial for introducing a small amount of fluorine-containing waste liquid in the concentrated fluorine adjustment unit into the dilute fluorine adjustment unit. The two parts of waste water can be mixed and homogenized in the dilute fluorine adjustment unit, which is convenient for lowering the pH value of the fluorine-containing waste water in the dilute fluorine adjustment unit, which is beneficial for improving the stability and effect of subsequent treatment, reducing the injection of acid liquid, and reducing costs.
[0034] In an optional embodiment, the mud outlet pipe of the concentrated fluorine sand settling unit is connected to the high-purity quartz sand processing process. The mud outlet pipe of the dilute fluorine sand settling unit is connected to the high-purity quartz sand processing process. The mud outlet pipes of the concentrated fluorine sand settling unit and the dilute fluorine sand settling unit are connected to the high-purity quartz sand processing process, which realizes the recycling of waste mud, reduces waste discharge, and reduces processing costs. This design conforms to the concept of circular economy and is conducive to resource conservation and environmental protection.
[0035] In an optional embodiment, the outlet pipe of the second filter press unit is connected to the dilute fluorine adjustment unit, so that the water after filter press can re-enter the wastewater treatment system for circulation treatment, avoiding environmental pollution caused by substandard fluoride in the filtrate.
[0036] In an optional embodiment, the second filter press unit includes a plurality of filter presses. This design can improve the filter press efficiency and processing capacity, ensuring that the wastewater treatment system can still operate stably under high load. At the same time, the configuration of multiple filter presses also increases the redundancy of the system and improves the reliability and stability of the system.
[0037] In an optional embodiment, the concentrated fluorine sand settling unit includes a first box for accommodating concentrated fluorine wastewater, and the bottom of the first box is set to a cone or slope shape; the dilute fluorine sand settling unit includes a second box for accommodating dilute fluorine wastewater, and the bottom of the second box is set to a cone or slope shape; the primary sand settling unit includes a third box for accommodating primary treated fluorine-containing wastewater, and the bottom of the third box is set to a cone or slope shape; the secondary sand settling unit includes a fourth box for accommodating secondary treated fluorine-containing wastewater, and the bottom of the fourth box is set to a cone or slope shape. Setting the bottom of the box of the sand settling unit to a cone or slope shape is conducive to the deposition and aggregation of sand particles, and improves the sand settling efficiency. This design can also reduce dead corners and mud accumulation in the box, reducing the difficulty of cleaning and maintenance. At the same time, the conical or sloped bottom structure also helps to discharge and recover mud, further improving the efficiency and effect of wastewater treatment.
[0038] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.
[0039] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.
Claims
1. A fluorine-containing wastewater treatment system, characterized in that: include: A concentrated fluorine wastewater treatment module, the concentrated fluorine wastewater treatment module is connected to the concentrated fluorine wastewater outlet of the high-purity quartz sand treatment process, including a concentrated fluorine sand settling unit, a concentrated fluorine regulating unit, a concentrated fluorine reaction unit, and a first filter press unit, the concentrated fluorine wastewater outlet is sequentially connected to the concentrated fluorine sand settling unit, the concentrated fluorine regulating unit, and the concentrated fluorine reaction unit, and the slurry outlet pipeline of the concentrated fluorine reaction unit is connected to the first filter press unit; A rare fluorine wastewater treatment module, the rare fluorine wastewater treatment module is connected to the rare fluorine wastewater drainage outlet of the high-purity quartz sand treatment process, including a rare fluorine sand settling unit and a rare fluorine regulating unit, the rare fluorine wastewater drainage outlet is sequentially connected to the rare fluorine sand settling unit and the rare fluorine regulating unit, the rare fluorine regulating unit is connected to the water outlet of the concentrated fluorine reaction unit through a valve, and the rare fluorine regulating unit is also connected to the water outlet of the first filter press unit through a pipeline; A primary fluorine-containing wastewater treatment module, the primary fluorine-containing wastewater treatment module comprises a defluorination initial adjustment unit, a defluorination fine-tuning unit, a primary coagulation defluorination unit, a primary flocculation defluorination unit, a primary sand settling unit, a mud storage unit, and a second filter press unit, the water outlet of the dilute fluorine adjustment unit is sequentially connected to the defluorination initial adjustment unit, the defluorination fine-tuning unit, the primary coagulation defluorination unit, the primary flocculation defluorination unit, and the primary sand settling unit, and the mud outlet of the primary sand settling unit is sequentially connected to the mud storage unit and the second filter press unit; A secondary fluorine-containing wastewater treatment module, the secondary fluorine-containing wastewater treatment module comprises a secondary pH value adjustment unit, a secondary coagulation and fluorine removal unit, a secondary flocculation and fluorine removal unit, a secondary grit unit, a mud storage unit, and a second filter press unit, the water outlet of the primary grit unit is sequentially connected to the secondary pH value adjustment unit, the secondary coagulation and fluorine removal unit, the secondary flocculation and fluorine removal unit, and the secondary grit unit, the water outlet pipe of the secondary grit unit is connected to the municipal pipe network, and the mud outlet of the secondary grit unit is sequentially connected to the mud storage unit and the second filter press unit; The dosing module is respectively connected with the concentrated fluorine wastewater treatment module, the diluted fluorine wastewater treatment module, the primary fluorine-containing wastewater treatment module and the secondary fluorine-containing wastewater treatment module, and comprises a coagulant storage unit, an acid storage unit, a calcium chloride storage unit, a flocculant storage unit, a defluoridant storage unit and a lime milk storage unit.
2. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The concentrated fluorine regulating unit is connected to the diluted fluorine regulating unit through a pipeline.
3. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The mud outlet pipeline of the concentrated fluorine sand settling unit is connected to the high-purity quartz sand processing process.
4. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The mud outlet pipeline of the rare fluorine sand settling unit is connected to the high-purity quartz sand processing process.
5. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The water outlet pipe of the second filter press unit is connected to the dilute fluorine regulating unit.
6. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The second filter press unit includes a plurality of filter presses.
7. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The concentrated fluorine sand settling unit comprises a first box body for containing concentrated fluorine wastewater, and the bottom of the first box body is configured to be conical or sloped.
8. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The rare fluorine sand settling unit comprises a second box body for containing rare fluorine wastewater, and the bottom of the second box body is configured to be conical or sloped.
9. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The primary sand settling unit comprises a third box body for accommodating primary treated fluorine-containing wastewater, and the bottom of the third box body is configured to be conical or sloped.
10. The fluorine-containing wastewater treatment system according to claim 1, characterized in that: The secondary sand settling unit comprises a fourth box body for accommodating secondary treated fluorine-containing wastewater, and the bottom of the fourth box body is configured to be conical or sloped.