Device for removing fluorine ions in fluorine-containing wastewater

By designing a device containing a multi-stage treatment device, the complex process and high cost problems in fluorine-containing wastewater treatment are solved by using homogeneous and average quantity adjustment, pH adjustment, alumina fluorine removal reaction, coagulation and flocculation treatment methods. , efficient fluoride ion removal and process simplification are achieved.

CN222205002UActive Publication Date: 2024-12-20SICHUAN ZHONGHECHUANG ECOLOGICAL ENVIRONMENT CO LTD
View PDF 0 Cites 0 Cited by

Patent Information

Application Number
CN202420893275.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-04-27
Publication Date
2024-12-20
Estimated Expiration
2034-04-27

AI Technical Summary

Technical Problem

The prior art has complex process flow and high cost problems in fluorine-containing wastewater treatment, making it difficult to effectively simplify the treatment process and reduce costs.

Method used

A device including a homogeneous average adjustment cell, a first pH adjustment cell, a fluorine removal reaction cell, a coagulation reaction cell, a flocculation reaction cell and a precipitation cell are designed, and alumina removal is carried out through homogeneous average treatment, pH adjustment, and alumina removal. Fluorine reaction, coagulation, flocculation and precipitation treatment to achieve multi-stage fluorine ions removal device.

Benefits of technology

The fluorine ion removal rate of more than 99.0% is achieved, which reduces the fluorine content in the wastewater, simplifies the process flow, and allows the removed water to be reused or directly discharged, reducing the treatment cost.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN222205002U_ABST
    Figure CN222205002U_ABST
Patent Text Reader

Abstract

The utility model discloses a device for removing fluorine ions in fluorine-containing wastewater, which belongs to the field of wastewater treatment and comprises a homogenizing and homogenizing regulating tank, a first pH (potential of hydrogen) regulating tank, a fluorine removal reaction tank, a fluorine removal agent adding device, a second coagulation reaction tank, a coagulant adding device, a second flocculation reaction tank, a flocculant adding device, a second sedimentation tank and a sludge collecting tank. The homogenizing and homogenizing regulating tank is connected with the first pH regulating tank, the first pH regulating tank is connected with the fluorine removal reaction tank, and the fluorine removal agent adding device is connected with the fluorine removal reaction tank. In the application, the fluorine-containing wastewater is homogenized and averaged, and the pH value of the wastewater is adjusted to 6.5-7.0; the method comprises the following steps of: performing fluorine removal treatment by using activated aluminum oxide as a fluorine removal agent, enabling fluorine ions to form precipitates through a coagulation method, and finally performing flocculation and precipitation to perform separation. The purified fluorine-containing wastewater can be recycled or directly discharged. The device disclosed by the utility model can be used for removing fluorine ions in various fluorine-containing wastewater, and has extremely high adaptability.
Need to check novelty before this filing date? Find Prior Art

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment, in particular to the field of fluorine-containing wastewater treatment, and specifically is a device for removing fluorine ions in fluorine-containing wastewater. Background Art

[0002] Fluorine is an indispensable trace element for the human body. It can enter the human body through drinking water, food, and breathing, among which drinking water is the most important way. However, when the concentration of fluorine in drinking water is too high (greater than 1.5 mg / L), it will damage human health.

[0003] At present, there are many methods for removing fluoride from wastewater, such as adsorption, chemical precipitation, coagulation sedimentation, electrochemical method, reverse osmosis and ion exchange, among which adsorption has a significant effect on fluoride and is the main method for removing fluoride.

[0004] To this end, people have conducted corresponding research. For example, Chinese patent application CN202310567303.0 discloses a fluorine-containing wastewater defluorination process, which includes the following operating steps: S1: First, the generated wastewater is transported to the sewage storage tank through a water pump and a water transmission network, and then when the wastewater needs to be treated, the good wastewater can be first transported to the first pH adjustment tank through a water pump, and the pH value of the wastewater is adjusted by adding alkaline substances through the first pH adjustment tank. In this scheme, through the coordinated action of the first pH adjustment tank and the first sedimentation tank, the alkaline substance can be used to precipitate the fluoride in the wastewater together with the impurities in the form of precipitation, and then the residual fluoride in the wastewater can be oxidized and removed by the defluorination structure, and finally the wastewater is subjected to the final step of defluorination treatment by the microbial treatment tank.

[0005] Chinese patent application CN202011160981.8 discloses a method for defluoridating fluoride-containing wastewater, comprising the following steps: S1. Adding ultrafine calcium fluoride seeds to the fluoride-containing wastewater and reacting for 5 to 10 minutes to evenly distribute the calcium fluoride seeds in the wastewater; S2. Adding calcium salt and chloride salt to the wastewater and reacting for 20 to 60 minutes to convert the fluoride in the wastewater into calcium fluoride; S3. Using alkali to adjust the pH value of the wastewater to 8 to 9 to precipitate calcium fluoride; S4. Adding polyacrylamide to the wastewater for flocculation reaction to separate the precipitate.

[0006] How to simplify the wastewater treatment process and reduce the cost of wastewater treatment has always been an urgent problem that people need to solve. To this end, the present application provides a device for removing fluoride ions from fluoride-containing wastewater. Utility Model Content

[0007] The utility model aims to provide a device for removing fluoride ions from fluoride-containing wastewater.

[0008] In order to achieve the above purpose, this application adopts the following technical solutions:

[0009] A device for removing fluoride ions from fluoride-containing wastewater, comprising:

[0010] A homogenization and equalization regulating tank, which can be used to treat the fluorine-containing wastewater in a homogenized and equalized manner;

[0011] The first pH adjustment tank is connected to the homogenization and equalization adjustment tank, and the wastewater treated in the homogenization and equalization adjustment tank can enter the first pH adjustment tank and adjust the pH value of the wastewater to weak acidity to neutral;

[0012] A defluorination reaction tank, which is connected to the first pH adjustment tank and the wastewater treated in the first pH adjustment tank can enter the defluorination reaction tank for defluorination reaction;

[0013] A defluorination agent adding device is connected to the defluorination reaction tank, and the defluorination agent adding device can add defluorination agent aluminum oxide into the defluorination reaction tank to make the fluoride ions in the wastewater generate aluminum fluoride that is insoluble in water and precipitate;

[0014] A second coagulation reaction tank is connected to the defluorination reaction tank and the wastewater in the defluorination reaction tank can enter the second coagulation reaction tank for coagulation reaction;

[0015] A coagulant adding device, which is connected to the second coagulation reaction tank and can add coagulant polyaluminium chloride into the second coagulation reaction tank;

[0016] A second flocculation reaction tank, which is connected to the second coagulation reaction tank and the wastewater in the second coagulation reaction tank can enter the second flocculation reaction tank for flocculation reaction;

[0017] A flocculant adding device, which is connected to the second flocculation reaction tank and can add flocculant polyacrylamide into the second flocculation reaction tank;

[0018] A second sedimentation tank is connected to the second flocculation reaction tank, and the wastewater treated in the second flocculation reaction tank can enter the second sedimentation tank for sedimentation treatment to obtain second sedimentation sludge and second supernatant respectively;

[0019] A sludge collection tank, which is connected to the second sedimentation tank and the second sedimentation sludge in the second sedimentation tank can enter the sludge collection tank;

[0020] The second sedimentation tank is connected to the homogenization and equalization regulating tank, and the second supernatant in the second sedimentation tank can be sent to the homogenization and equalization regulating tank to be mixed with the fluorine-containing wastewater to be treated and subjected to homogenization and equalization treatment.

[0021] The second coagulation reaction tank is connected to the second flocculation reaction tank to form a multi-grid reactor.

[0022] The second sedimentation tank is an inclined tube sedimentation tank.

[0023] The pH value of the wastewater in the first pH adjustment pool is adjusted to 6.5-7.0.

[0024] It also includes a first pH adding device, which is connected to the first pH adjusting tank and can add a pH adjusting agent into the first pH adjusting tank to adjust the pH value of the wastewater to 6.5-7.0.

[0025] It also includes a clean water temporary storage device, which is connected to the second sedimentation tank and the second supernatant in the second sedimentation tank can enter the clean water temporary storage device for temporary storage.

[0026] The clean water temporary storage device is connected to the homogenization and equalization regulating tank, and the water in the clean water temporary storage device can be returned to the homogenization and equalization regulating tank to be mixed with the fluorine-containing wastewater to be treated and subjected to homogenization and equalization treatment.

[0027] It also includes a sludge filter press device, which is connected to the sludge collection tank and can perform filter press treatment on the sludge in the sludge collection tank.

[0028] It also includes a sludge drying device, which is connected to the sludge filter press device and can dry the sludge after filtering by the sludge filter press device.

[0029] It also includes a sludge temporary storage device, which is connected to the sludge drying device and the sludge treated in the sludge drying device can be sent to the sludge temporary storage device for temporary storage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the device for removing fluoride ions from fluoride-containing wastewater in Example 1.

[0031] Markings in the figure: 1. Homogeneous and uniform quantity adjustment tank, 2. First pH adjustment tank, 3. Defluorination reaction tank, 4. Defluorination agent adding device, 5. Multi-grid reactor, 6. Coagulant adding device, 7. Flocculant adding device, 8. Second sedimentation tank, 9. Sludge collection tank. DETAILED DESCRIPTION

[0032] The utility model is described in detail below in conjunction with the accompanying drawings.

[0033] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0034] The existence states of fluorine in wastewater are divided into organic fluorine and fluoride ions. The device of the present application is mainly used to remove fluoride ions in wastewater.

[0035] The device for removing fluoride ions from fluoride-containing wastewater in this embodiment includes a homogenizing and averaging regulating tank, a first pH regulating tank, a defluorination reaction tank, a defluorination agent adding device, a second coagulation reaction tank, a coagulant adding device, a second flocculation reaction tank, a flocculant adding device, a second sedimentation tank, and a sludge collection tank. The homogenizing and averaging regulating tank is connected to the first pH regulating tank, the first pH regulating tank is connected to the defluorination reaction tank, and the defluorination agent adding device is connected to the defluorination reaction tank. At the same time, the defluorination reaction tank is connected to the second coagulation reaction tank, and the coagulant adding device is connected to the second coagulation reaction tank; the second coagulation reaction tank is connected to the second flocculation reaction tank, and the flocculant adding device is connected to the second flocculation reaction tank; the second flocculation reaction tank is connected to the second sedimentation tank, and the second sedimentation tank is connected to the sludge collection tank; the second sedimentation tank is connected to the homogenizing and averaging regulating tank. In this embodiment, the second coagulation reaction tank is connected to the second flocculation reaction tank and constitutes a multi-grid reactor.

[0036] Preferably, it also includes a first pH adding device, which is connected to the first pH adjusting tank, and the first pH adding device can add a pH adjusting agent into the first pH adjusting tank to adjust the pH value of the wastewater to 6.5-7.0.

[0037] With this structure, the homogeneous and uniform regulating tank is used to treat the fluorine-containing wastewater in a homogeneous and uniform manner.

[0038] Using the device of this application, the working process is as follows:

[0039] (1) The wastewater treated in the homogenization and equalization regulating tank first enters the first pH regulating tank, and the pH value of the wastewater is adjusted to weak acidity to neutrality; in a specific example, the pH value of the wastewater is adjusted to 6.5-7.0; specifically, according to the acidity and alkalinity of the fluorine-containing wastewater, hydrochloric acid or sodium hydroxide is added to adjust the pH value of the wastewater to 6.5-7.0;

[0040] (2) The defluorination agent adding device can add defluorination agent aluminum oxide into the defluorination reaction tank; the wastewater treated by the first pH adjustment tank can enter the defluorination reaction tank to carry out defluorination reaction; in the defluorination reaction tank, by adding defluorination agent aluminum oxide (usually activated aluminum oxide), aluminum fluoride that is insoluble in water is precipitated, thereby achieving the purpose of removing fluoride ions in water. The reaction equation is as follows:

[0041] (Al2O3)nl ion 2O + SO4 2- →(Al2O3)nl+ O4 2- + 2OH -

[0042] (Al2O3)nl22S O4 2- + 2F→ (Al2O3)nl2FHO,SO4 2-

[0043] (3) The coagulant adding device is used to add polyaluminium chloride as a coagulant into the second coagulation reaction tank, and the flocculant adding device is used to add polyacrylamide as a flocculant into the second flocculation reaction tank; the wastewater in the defluorination reaction tank first enters the second coagulation reaction tank for coagulation reaction; after the coagulation reaction, the wastewater in the second coagulation reaction tank is then sent to the second flocculation reaction tank for flocculation reaction;

[0044] This application adopts multi-stage defluorination treatment, which can achieve a removal rate of more than 99.0%; after measurement, the fluorine content in the wastewater treated by this application can be reduced to 1 mg / L;

[0045] (4) The wastewater treated in the second flocculation reaction tank can enter the second sedimentation tank for sedimentation treatment, and obtain the second sedimentation sludge and the second supernatant respectively; the second sedimentation sludge in the second sedimentation tank is sent to the sludge collection tank for collection; the second supernatant in the second sedimentation tank is sent to the homogenization and equalization adjustment tank, the second supernatant is mixed with the fluorine-containing wastewater to be treated, and homogenization and equalization treatment is carried out, that is, the produced water after fluorine removal can be reused; or the second supernatant is directly discharged.

[0046] In summary, in this application, the fluorine-containing wastewater is first homogenized and treated, and the pH of the wastewater is adjusted to 6.5-7.0; then activated alumina is used as a defluorinating agent for defluorination, and fluoride ions are precipitated by coagulation, and finally separated by flocculation and precipitation. The purified fluorine-containing wastewater can be reused or directly discharged. The device of this application can be used for the removal of fluoride ions in various fluoride-containing wastewaters and has strong adaptability.

[0047] Furthermore, the second sedimentation tank of this embodiment is an inclined tube sedimentation tank. It also includes a clean water temporary storage device, which is connected to the second sedimentation tank and the homogenization and equalization regulating tank. With this structure, the second supernatant in the second sedimentation tank can enter the clean water temporary storage device for temporary storage, and the water in the clean water temporary storage device can return to the homogenization and equalization regulating tank.

[0048] Furthermore, it also includes a sludge filter press device and a sludge drying device. The sludge collection tank is connected to the sludge filter press device, and the sludge filter press device is connected to the sludge drying device. With this structure, the sludge filter press device can filter the sludge in the sludge collection tank, and the sludge drying device can dry the sludge after the sludge filter press device has filtered; the sludge obtained after the drying treatment can be temporarily stored or outsourced for treatment. Furthermore, it also includes a sludge temporary storage device, which is connected to the sludge drying device, and the sludge treated in the sludge drying device can be sent to the sludge temporary storage device for temporary storage.

[0049] Example 1

[0050] The fluoride ion concentration of a coal chemical wastewater is 24 mg / L. After the device of the present application is used for treatment, the corresponding defluoridation agent is added, and the pH is adjusted, the fluoride ion concentration of the treated wastewater is 0.8 mg / L.

[0051] Example 2

[0052] The fluoride ion concentration of the wastewater of a photovoltaic enterprise is 36 mg / L. After the device of the present application is used for treatment, the corresponding defluoridation agent is added, and the pH is adjusted, the fluoride ion concentration of the treated wastewater is 1 mg / L.

[0053] Example 3

[0054] The fluoride ion concentration of a municipal wastewater is 6 mg / L. After the device of the present application is used for treatment, the corresponding defluoridation agent is added, and the pH is adjusted, the fluoride ion concentration of the treated wastewater is 0.5 mg / L.

[0055] Example 4

[0056] The fluoride ion concentration of polysilicon production wastewater is 45 mg / L. After the device of the present application is used for treatment, the corresponding defluoridation agent is added, and the pH is adjusted, the fluoride ion concentration of the treated wastewater is 5 mg / L.

[0057] Example 5

[0058] The fluoride ion concentration of the pre-treated defluoridated wastewater from the acid treatment and passivation process of an aluminum processing plant was 78 mg / L. After the device of the present application was used for treatment, the corresponding defluoridation agent was added, and the pH was adjusted, the fluoride ion concentration of the treated wastewater was 7.5 mg / L.

[0059] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for removing fluoride ions from fluoride-containing wastewater, characterized in that: include: A homogenization and equalization regulating tank, which can be used to treat the fluorine-containing wastewater in a homogenized and equalized manner; The first pH adjustment tank is connected to the homogenization and equalization adjustment tank, and the wastewater treated in the homogenization and equalization adjustment tank can enter the first pH adjustment tank and adjust the pH value of the wastewater to weak acidity to neutral; A defluorination reaction tank, which is connected to the first pH adjustment tank and the wastewater treated in the first pH adjustment tank can enter the defluorination reaction tank for defluorination reaction; A defluorination agent adding device is connected to the defluorination reaction tank, and the defluorination agent adding device can add defluorination agent aluminum oxide into the defluorination reaction tank to make the fluoride ions in the wastewater generate aluminum fluoride that is insoluble in water and precipitate; A second coagulation reaction tank is connected to the defluorination reaction tank and the wastewater in the defluorination reaction tank can enter the second coagulation reaction tank for coagulation reaction; A coagulant adding device, which is connected to the second coagulation reaction tank and can add coagulant polyaluminium chloride into the second coagulation reaction tank; A second flocculation reaction tank, which is connected to the second coagulation reaction tank and the wastewater in the second coagulation reaction tank can enter the second flocculation reaction tank for flocculation reaction; A flocculant adding device, which is connected to the second flocculation reaction tank and can add flocculant polyacrylamide into the second flocculation reaction tank; A second sedimentation tank is connected to the second flocculation reaction tank, and the wastewater treated in the second flocculation reaction tank can enter the second sedimentation tank for sedimentation treatment to obtain second sedimentation sludge and second supernatant respectively; A sludge collection tank, which is connected to the second sedimentation tank and the second sedimentation sludge in the second sedimentation tank can enter the sludge collection tank; The second sedimentation tank is connected to the homogenization and equalization regulating tank, and the second supernatant in the second sedimentation tank can be sent to the homogenization and equalization regulating tank to be mixed with the fluorine-containing wastewater to be treated and subjected to homogenization and equalization treatment.

2. The device according to claim 1, characterized in that The second sedimentation tank is an inclined tube sedimentation tank.

3. The device according to claim 1, characterized in that It also includes a first pH adding device, which is connected to the first pH adjusting tank and can add a pH adjusting agent into the first pH adjusting tank.

4. The device according to claim 1, characterized in that It also includes a clean water temporary storage device, which is connected to the second sedimentation tank and the second supernatant in the second sedimentation tank can enter the clean water temporary storage device for temporary storage.

5. The device according to claim 4, characterized in that The clean water temporary storage device is connected to the homogenization and equalization regulating tank, and the water in the clean water temporary storage device can be returned to the homogenization and equalization regulating tank to be mixed with the fluorine-containing wastewater to be treated and subjected to homogenization and equalization treatment.

6. The device according to any one of claims 1 to 5, characterized in that: It also includes a sludge filter press device, which is connected to the sludge collection tank and can perform filter press treatment on the sludge in the sludge collection tank.

7. The device according to claim 6, characterized in that It also includes a sludge drying device, which is connected to the sludge filter press device and can dry the sludge after filtering by the sludge filter press device.

8. The device according to claim 7, characterized in that It also includes a sludge temporary storage device, which is connected to the sludge drying device and the sludge treated in the sludge drying device can be sent to the sludge temporary storage device for temporary storage.