Deep defluorination device for aluminum resin

Abstract

The utility model provides a deep defluorination device for aluminum resin, which is characterized by comprising a first-stage defluorination device, a second-stage defluorination device, a third-stage defluorination device and a solution callback device, the primary defluorination device comprises a first dosing tank, a first regulating tank, a first flocculation tank and a first sedimentation tank; the secondary defluorination device comprises a second dosing tank, a second regulating tank, a second flocculation tank and a second sedimentation tank; the three-stage defluorination device comprises a resin adsorption column; and the solution callback device comprises a third regulating tank, a third flocculation tank and a third sedimentation tank. According to the utility model, the fluorine content in the wastewater is stably and deeply removed, the increasingly strict discharge standard is met, the resource utilization efficiency is obviously improved, the overall cost of wastewater treatment is reduced, and an efficient, economical and environment-friendly new scheme is provided for the field of industrial wastewater treatment.

Description

Technical Field

[0001] The utility model relates to a deep defluorination device, more specifically, to an aluminum resin deep defluorination device. Background Art

[0002] With growing environmental awareness and stricter regulations, fluoride emission standards are being continuously tightened across various industries to reduce pollution to natural water bodies and protect ecological balance. In particular, some regions with strong environmental awareness have implemented extremely stringent emission standards, requiring wastewater fluoride content to be no more than 1 milligram per liter (F≤1 mg / L). This poses unprecedented challenges to wastewater treatment technologies. Among traditional fluoride removal technologies, calcium salt precipitation is widely used due to its ease of operation. However, this method produces large amounts of sludge when treating high-fluoride wastewater, increasing treatment costs and making it difficult to achieve deep fluoride removal. This limitation is particularly evident when reducing fluoride content to below 1 mg / L. Another commonly used method is chemical precipitation using trivalent aluminum reagents. While this method can improve fluoride removal efficiency to a certain extent, achieving deep fluoride removal requires significantly increased reagent dosage, which not only increases treatment costs but also makes it difficult to maintain the fluoride content in the effluent at a stable level below 1 mg / L over the long term.

[0003] In view of this, the present utility model proposes an aluminum resin deep defluorination device, which cleverly integrates a variety of existing technologies and innovatively returns the resin eluate as a reagent to the front-end reagent defluorination stage, thereby realizing the recycling of resources. Specifically, this process first uses an aluminum-based resin to deeply defluorinate the wastewater, and then collects and treats the eluate generated during the resin regeneration process. After appropriate adjustment, it is re-added to the front-end defluorination link as an aluminum source reagent. This strategy not only effectively reduces the demand for fresh reagents and reduces the overall reagent cost, but also avoids the direct discharge of aluminum and fluorine in the eluate, thereby reducing subsequent disposal costs and environmental burdens. Through the optimized design of this process flow, the present utility model not only achieves a stable and deep removal of fluoride content in wastewater, meets increasingly stringent emission standards, but also significantly improves resource utilization efficiency and reduces the overall cost of wastewater treatment, providing a new, efficient, economical and environmentally friendly solution for the field of industrial wastewater treatment. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an aluminum resin deep defluorination device, which adopts the following technical solutions:

[0005] A deep defluorination device for aluminum resin, characterized in that it includes a primary defluorination device, a secondary defluorination device, a tertiary defluorination device, and a solution callback device; the primary defluorination device includes a first dosing tank, a first regulating tank, a first flocculation tank, and a first sedimentation tank; the secondary defluorination device includes a second dosing tank, a second regulating tank, a second flocculation tank, and a second sedimentation tank; the tertiary defluorination device includes a resin adsorption column; the solution callback device includes a third regulating tank, a third flocculation tank, and a third sedimentation tank.

[0006] Furthermore, the first dosing tank and the second dosing tank may each be composed of one or more reaction tanks connected in series.

[0007] Furthermore, a reflux pipe is provided between the resin adsorption column and the second dosing tank.

[0008] Furthermore, an online pH meter is provided in each of the first regulating tank, the second regulating tank and the third regulating tank; the pH of the first regulating tank is controlled at 6.0-8.0, and the pH of the second regulating tank and the third regulating tank is controlled at 6.3-6.8.

[0009] Furthermore, an online fluoride ion monitor is provided in the third regulating tank.

[0010] Furthermore, the resin adsorption column uses aluminum-based resin; the resin adsorption column controls the flow rate to be 5~10 BV / h when the device is operating normally; and the resin adsorption column controls the flow rate to be 2~4 BV / h during the regeneration liquid treatment process.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] (1) Strong deep defluorination capability: By using aluminum-based resin for deep defluorination, the fluorine content in wastewater can be effectively reduced to below 1 mg / L, meeting strict environmental emission standards;

[0013] (2) Resource recycling: The eluate generated during the resin regeneration process is used as a reagent to flow back to the previous reagent defluorination stage, thus realizing the recycling of aluminum resources, reducing the demand for fresh reagents, and lowering the overall reagent cost;

[0014] (3) Reduce treatment costs: By reducing the amount of reagents used and avoiding the direct discharge of aluminum and fluorine in the eluent, the subsequent disposal costs are reduced and the economic efficiency of wastewater treatment is improved;

[0015] (4) Significant environmental benefits: This process not only reduces fluorine pollution in wastewater, but also reduces the impact on the environment through the recycling of resources, which is in line with the concept of sustainable development;

[0016] (5) Good effluent stability: By optimizing the process flow, the stability of the fluorine content in the effluent can be ensured to meet the requirements of long-term stable emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural diagram of the present utility model.

[0018] Among them, 1-first-stage defluorination device, 2-second-stage defluorination device, 3-third-stage defluorination device, 4-solution callback device, 5-first dosing tank, 6-first regulating tank, 7-first flocculation tank, 8-first sedimentation tank, 9-second dosing tank, 10-second regulating tank, 11-second flocculation tank, 12-second sedimentation tank, 13-resin adsorption column, 14-third regulating tank, 15-third flocculation tank, 16-third sedimentation tank, 17-reflux pipe, 18-online pH meter, 19-online fluoride ion monitor. DETAILED DESCRIPTION

[0019] The present invention will be further described and illustrated below in conjunction with the accompanying drawings and specific implementation methods.

[0020] like Figure 1 As shown, the utility model provides an energy-saving high-pressure reverse osmosis device that can adapt to changes in water inlet volume, which includes a first-stage defluorination device 1, a second-stage defluorination device 2, a third-stage defluorination device 3, a solution callback device 4, a first dosing tank 5, a first regulating tank 6, a first flocculation tank 7, a first sedimentation tank 8, a second dosing tank 9, a second regulating tank 10, a second flocculation tank 11, a second sedimentation tank 12, a resin adsorption column 13, a third regulating tank 14, a third flocculation tank 15, a third sedimentation tank 16, a reflux pipe 17, an online pH meter 18, and an online fluoride ion monitor 19.

[0021] The device includes a primary defluorination device 1, a secondary defluorination device 2, a tertiary defluorination device 3, and a solution adjustment device 4; the primary defluorination device 1 includes a first dosing tank 5, a first regulating tank 6, a first flocculation tank 7, and a first sedimentation tank 8; the secondary defluorination device 2 includes a second dosing tank 9, a second regulating tank 10, a second flocculation tank 11, and a second sedimentation tank 12; the tertiary defluorination device 3 includes a resin adsorption column 13; the solution adjustment device 4 includes a third regulating tank 16, a third flocculation tank 15, and a third sedimentation tank 16.

[0022] The first dosing tank 5 and the second dosing tank 9 can be composed of one or more reaction tanks connected in series respectively; a reflux pipe 17 is also provided between the resin adsorption column 13 and the second dosing tank 9; an online pH meter 18 is provided in the first regulating tank 6, the second regulating tank 10 and the third regulating tank 14 respectively; the pH of the first regulating tank 6 is controlled at 6.0~8.0, and the pH of the second regulating tank 10 and the third regulating tank 14 is controlled at 6.3~6.8; an online fluoride ion monitor 19 is provided in the third regulating tank 14; the resin adsorption column 13 adopts aluminum-based resin; the resin adsorption column 13 controls the flow rate to 5~10 BV / h when the device is operating normally; the resin adsorption column 13 controls the flow rate to 2~4 BV / h during the regeneration liquid treatment process.

[0023] The working principle of the device is as follows: fluorine-containing wastewater enters the first dosing tank 5 in the primary defluorination device 1, calcium chloride is added to the first dosing tank 5, and the addition amount is Ca:F molar ratio = 2:1. After stirring and reacting for 30 minutes, it enters the first regulating tank 5 to adjust the pH to 6.0-8.0. The effluent from the first regulating tank 5 enters the first flocculation tank 7 and PAM is added for flocculation and precipitation. The effluent from the first flocculation tank 7 enters the first sedimentation tank 8 for mud-water separation; the effluent from the primary defluorination device 1 enters the secondary defluorination device 2 The second dosing tank 9 is filled with a defluoridating agent and reacts for 15 minutes. The effluent from the second dosing tank 9 enters the second regulating tank 10 to adjust the solution temperature to 6.3-6.8. The effluent from the second regulating tank 10 enters the second flocculation tank 11 to add PAM for flocculation and sedimentation. The effluent from the second flocculation tank 11 enters the second sedimentation tank 12 for mud-water separation. The effluent from the secondary defluoridation device 2 enters the resin adsorption column 13 in the tertiary defluoridation device 3. The resin adsorption column 13 adopts a top-in and bottom-out method and controls the flow rate to 5-10 BV / h. The effluent from the tertiary defluoridation device 3 enters the third regulating tank 14 of the solution callback device 4 to adjust the solution temperature to 6.3-6.8. The effluent from the third regulating tank 14 enters the third flocculation tank 15 to add PAM for flocculation and sedimentation. The effluent from the third flocculation tank 15 enters the third sedimentation tank 16 for mud-water separation. The effluent from the tertiary defluoridation device 3 is directly discharged.

[0024] When regenerating the resin adsorption column 13, normal water inlet is stopped, and 10% aluminum chloride solution is used with an elution flow rate of 2-4 BV / h. The elution regeneration liquid contains high concentrations of aluminum ions and fluoride ions and enters the second regulating tank 10 through the reflux pipe 17. Example

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in combination with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0026] like Figure 1 As shown in the figure, an aluminum resin deep defluorination device manufactured by this project using the above technical solution has been put into use, and the object of treatment is fluorine-containing wastewater.

[0027] The device includes a primary defluorination device 1, a secondary defluorination device 2, a tertiary defluorination device 3, and a solution adjustment device 4; the primary defluorination device 1 includes a first dosing tank 5, a first regulating tank 6, a first flocculation tank 7, and a first sedimentation tank 8; the secondary defluorination device 2 includes a second dosing tank 9, a second regulating tank 10, a second flocculation tank 11, and a second sedimentation tank 12; the tertiary defluorination device 3 includes a resin adsorption column 13; the solution adjustment device 4 includes a third regulating tank 14, a third flocculation tank 15, and a third sedimentation tank 16.

[0028] The first dosing tank 5 and the second dosing tank 9 can be composed of one or more reaction tanks connected in series respectively; a reflux pipe 17 is also provided between the resin adsorption column 13 and the second dosing tank 9; an online pH meter 18 is provided in the first regulating tank 6, the second regulating tank 10 and the third regulating tank 14 respectively; the pH of the first regulating tank 6 is controlled at 6.0~8.0, and the pH of the second regulating tank 10 and the third regulating tank 14 is controlled at 6.3~6.8; an online fluoride ion monitor 19 is provided in the third regulating tank 14; the resin adsorption column 13 adopts aluminum-based resin; the resin adsorption column 13 controls the flow rate to 5~10 BV / h when the device is operating normally; the resin adsorption column 13 controls the flow rate to 2~4 BV / h during the regeneration liquid treatment process.

[0029] This device is used to treat fluoride-containing wastewater in the electroplating industry, and can treat raw water with F=100 mg / L to F<0.5 mg / L.

[0030] The above-described embodiments are merely intended to illustrate one embodiment of the present invention and are not intended to limit the present invention. It should be noted that a person skilled in the art may modify the technical solutions described in the above-described embodiments or replace some or all of the technical features therein with equivalents; and these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of protection of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative work shall fall within the scope of protection of the present invention.

Claims

1. A deep defluorination device for aluminum resin, characterized in that: It includes a primary defluorination device, a secondary defluorination device, a tertiary defluorination device, and a solution callback device; the primary defluorination device includes a first dosing tank, a first regulating tank, a first flocculation tank, and a first sedimentation tank; the secondary defluorination device includes a second dosing tank, a second regulating tank, a second flocculation tank, and a second sedimentation tank; the tertiary defluorination device includes a resin adsorption column; the solution callback device includes a third regulating tank, a third flocculation tank, and a third sedimentation tank.

2. The deep defluorination device for aluminum resin according to claim 1, characterized in that: The first dosing tank and the second dosing tank can each be composed of one or more reaction tanks connected in series.

3. The deep defluorination device for aluminum resin according to claim 1, characterized in that: A reflux pipe is further provided between the resin adsorption column and the second dosing tank.

4. The deep defluorination device for aluminum resin according to claim 1, characterized in that: The first regulating tank, the second regulating tank and the third regulating tank are respectively provided with an online pH meter; the pH of the first regulating tank is controlled at 6.0-8.0, and the pH of the second regulating tank and the third regulating tank is controlled at 6.3-6.

8.

5. The deep defluorination device for aluminum resin according to claim 1, characterized in that: An online fluoride ion monitor is provided in the third regulating tank.

6. The aluminum resin deep defluorination device according to claim 1, characterized in that: The resin adsorption column uses aluminum-based resin; the resin adsorption column controls the flow rate to be 5~10 BV / h when the device is operating normally; the resin adsorption column controls the flow rate to be 2~4 BV / h during the regeneration liquid treatment process.

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