Rainwater thallium removal integrated device

Abstract

This utility model belongs to the field of industrial wastewater treatment technology, and discloses an integrated rainwater thallium removal device, including a collection tank, a treatment mixing tank, an aeration oxidation tank, a first deep cone thickener, a filter press, and an outlet water tank. The collection tank, treatment mixing tank, aeration oxidation tank, and first deep cone thickener are connected in series on the same pipeline. The concentrated liquid outlet of the first deep cone thickener is connected to the liquid inlet of the filter press, and the clear liquid outlet of the first deep cone thickener is connected to the outlet water tank. The liquid outlet of the filter press is returned to the treatment mixing tank through a return pipe. The principle of the deep cone thickener equipment of this utility model is to achieve efficient solid-liquid separation by using gravity sedimentation combined with flocculants to accelerate particle sedimentation. At the same time, the solid content of the sludge is increased through flocculation reaction. The separation problem of wastewater and sludge can be solved by using a smaller filter press, thereby reducing the investment in filter press equipment.

Description

Technical Field

[0001] This utility model relates to the field of industrial wastewater treatment technology, and in particular to an integrated rainwater thallium removal device. Background Technology

[0002] In recent years, with the development of industrial production, the problem of thallium-containing rainwater (or sewage) pollution has become increasingly prominent, posing a serious threat to the ecological environment and human health. In particular, the smelting industry has attracted the attention of the national environmental protection department, which has strictly supervised companies that have thallium-related materials and required them to take relevant rectification measures to ensure that the water quality of treated rainwater (or sewage) meets the national discharge standards.

[0003] The national environmental protection department requires production plants to collect rainwater from the first 15-30 minutes of the day and separate it from the rainwater that meets the standards later. The collected rainwater must be treated to remove thallium before it can be discharged. The emergency treatment volume is large, and the slag particles produced during the thallium removal process are very fine. Using conventional filter press equipment for separation is difficult and can easily lead to low production efficiency. Utility Model Content

[0004] To overcome the technical defects of the existing technology, this utility model provides an integrated rainwater thallium removal device, which increases the solid content of the sediment through flocculation reaction. It can solve the problem of separating sewage and sediment by using a smaller filter press, thereby reducing the investment in filter press equipment.

[0005] The technical solution adopted in this utility model is: an integrated rainwater thallium removal device, comprising a collection tank, a treatment mixing tank, an aeration oxidation tank, a first deep cone thickener, a filter press, and an outlet water tank; the collection tank, treatment mixing tank, aeration oxidation tank, and first deep cone thickener are connected in series on the same pipeline; the concentrated liquid outlet of the first deep cone thickener is connected to the liquid inlet of the filter press, and the clear liquid outlet of the first deep cone thickener is connected to the outlet water tank; the liquid outlet of the filter press is returned to the treatment mixing tank via a return pipe.

[0006] The aerated oxidation tank is equipped with multiple aeration mechanisms, each including a venturi tube. The venturi tube has an air inlet pipe at its throat, a liquid inlet pipe connected to the inlet constriction section, and a liquid outlet pipe connected to the diffusion recovery section. The aerated oxidation tank is also equipped with a circulation pump, the liquid outlet of which is connected to the liquid inlet pipe via a liquid guide pipe.

[0007] Preferably, it also includes a dosing tank for adding the reagent into the treatment mixing tank.

[0008] Preferably, a second deep cone thickener is connected in series between the first deep cone thickener and the outlet water tank, and the concentrate outlet of the second deep cone thickener is connected to the inlet of the filter press, the clear liquid outlet of the second deep cone thickener is connected to the outlet water tank, and the clear liquid outlet of the first deep cone thickener is connected to the inlet of the second deep cone thickener.

[0009] Preferably, the liquid outlet pipe is further provided with guide jets at both ends.

[0010] Preferably, the guide tube is inclined downwards.

[0011] Preferably, the side wall of the liquid outlet pipe is also provided with swirl fins.

[0012] Preferably, the air intake pipe is provided with a dust filter cover.

[0013] The beneficial effects of this utility model are as follows: 1. This utility model consists of a collection tank, a treatment mixing tank, an aeration oxidation tank, a first deep cone thickener, a filter press, and an outlet water tank, forming an integrated device for removing thallium from rainwater. The collection tank collects thallium-containing rainwater and sends it to the treatment mixing tank for chemical mixing. The mixed solution is then pumped into the aeration oxidation tank for aeration oxidation and mixing reaction, and then pumped into the deep cone thickener for flocculation and clarification reaction, followed by sedimentation to complete solid-liquid separation. The filter press is used to filter the sediment at the bottom of the deep cone thickener, and the filtered liquid is returned to the treatment mixing tank. The deep cone thickener in this utility model works on the principle of gravity sedimentation combined with flocculants to accelerate particle sedimentation, achieving efficient solid-liquid separation. At the same time, the flocculation reaction increases the solid content of the sludge. A smaller filter press can solve the problem of separating sewage and sludge, thereby reducing the investment in filter press equipment. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the processing mixing tank of this utility model;

[0017] Figure 3 This is a schematic diagram of the intake pipe structure of this utility model;

[0018] Figure 4This is a schematic diagram of the swirl fin structure of this utility model.

[0019] Explanation of reference numerals in the attached diagram: 1. Collection tank; 2. Treatment mixing tank; 3. Aeration oxidation tank; 4. First deep cone thickener; 5. Filter press; 6. Outlet water tank; 7. Dosing tank; 8. Return pipe; 9. Venturi tube; 10. Air inlet pipe; 11. Liquid inlet pipe; 12. Liquid outlet pipe; 13. Circulation pump; 14. Liquid guide pipe; 15. Second deep cone thickener; 16. Guide jet pipe; 17. Swirl fins. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0021] like Figures 1 to 4 As shown, this embodiment provides an integrated rainwater thallium removal device, including a collection tank 1, a treatment mixing tank 2, an aeration oxidation tank 3, a first deep cone thickener 4, a filter press 5, and an outlet water tank 6. The collection tank 1, treatment mixing tank 2, aeration oxidation tank 3, and first deep cone thickener 4 are connected in series on the same pipeline. The concentrated liquid outlet of the first deep cone thickener 4 is connected to the liquid inlet of the filter press 5, and the clear liquid outlet of the first deep cone thickener 4 is connected to the outlet water tank 6. The liquid outlet of the filter press 5 is returned to the treatment mixing tank 2 via a return pipe 8. This utility model consists of a collection tank 1, a treatment mixing tank 2, an aeration oxidation tank 3, a first deep cone thickener 4, a filter press 5, and an outlet water tank 6 connected to form an integrated device for thallium removal from rainwater. 1. Thallium-containing rainwater is collected and sent to a treatment mixing tank 2 for chemical mixing. The mixed solution is then pumped into an aeration oxidation tank 3 for aeration oxidation and mixing reaction. After that, it is pumped into a deep cone thickener for flocculation and clarification reaction, followed by sedimentation to complete solid-liquid separation. The sediment at the bottom of the deep cone thickener is then filtered by a filter press 5, and the filtered liquid is returned to the treatment mixing tank 2. The principle of the deep cone thickener in this invention is based on gravity sedimentation combined with flocculants to accelerate particle sedimentation, achieving efficient solid-liquid separation. At the same time, the flocculation reaction increases the solid content of the sediment. A smaller filter press can solve the problem of separating sewage and sediment, thereby reducing the investment in filter press equipment.

[0022] The aerated oxidation tank 3 is equipped with multiple aeration mechanisms, each including a venturi tube 9. The venturi tube 9 has an air inlet pipe 10 at its throat, an inlet constriction section connected to a liquid inlet pipe 11, and a diffusion recovery section connected to an outlet pipe 12. The aerated oxidation tank 3 is also equipped with a circulation pump 13, the outlet of which is connected to the inlet pipe 10 via a liquid guide pipe 14. The solution in the aerated oxidation tank 3 is pumped into the inlet pipe by a circulating pump. As the liquid flows through the venturi tube, a negative pressure is generated at the throat, which draws in outside air through the air inlet pipe. This mixes the air with the solution, thus achieving the aeration effect. Both ends of the outlet pipe 12 are equipped with guide jet pipes 16. The guide jet pipes 16 are inclined downwards, and the solution is guided to the bottom of the treatment mixing tank 2 through the outlet pipe 12 and the guide jet pipes 16, thereby agitating the solution. This eliminates the need for a stirring mechanism and effectively prevents sediment from accumulating at the bottom of the treatment mixing tank 2.

[0023] It also includes a dosing tank 7 for adding chemicals into the treatment mixing tank 2.

[0024] A second deep cone thickener 15 is connected in series between the first deep cone thickener 4 and the outlet pool 6. The concentrated liquid outlet of the second deep cone thickener 15 is connected to the inlet of the filter press 5, and the clear liquid outlet of the second deep cone thickener 15 is connected to the outlet pool 6. The clear liquid outlet of the first deep cone thickener 4 is connected to the inlet of the second deep cone thickener 15. The deep cone thickener equipment operates on the principle of gravity sedimentation, combined with flocculants to accelerate particle sedimentation, achieving efficient solid-liquid separation. Its core structure includes a circular thickener, a consumable scraper, and an automatic control system. It uses tangential feed pipes and degassing tanks to optimize the slurry flow path, offering advantages such as high underflow concentration, large processing capacity, and small footprint. Simultaneously, flocculation increases the solid content of the sludge. A smaller filter press can solve the separation problem between wastewater and sludge, thus reducing the investment in filter press equipment. The use of double deep cone thickeners for concentration results in better wastewater treatment performance.

[0025] The side wall of the liquid outlet pipe 12 is also provided with swirl fins 17, which force the fluid to generate a tangential velocity component through the spiral flow guiding structure, forming a swirling flow field. This allows the solution to be fully mixed with the air, thereby ensuring a good aeration effect.

[0026] The air intake pipe 10 is equipped with a dust filter cover, which serves to filter out large particles of foreign matter.

[0027] The process operation requirements of this utility model are as follows:

[0028] (1) Store a certain amount of thallium-containing rainwater (or sewage) in the collection tank, pump it into the dosing and mixing tank, adjust the pH to 11-12 with lime (lime prepared with a mass concentration of 10%), add an oxidant (polyferric sulfate) for oxidation, add thallium removal agent 001 at a dosage of 1-1.5 g / L, and stir the reaction for 10 minutes.

[0029] (2) The above solution is then pumped into the aeration oxidation tank 3 and a certain amount of anionic PAM flocculant is added to carry out the aeration oxidation mixed reaction.

[0030] (3) The solution is then pumped into a deep cone thickener to undergo flocculation and clarification reaction, and then precipitates to complete solid-liquid separation.

[0031] (4) The supernatant was analyzed and tested. The concentration of thallium in the solution was reduced from 60 μg / L in the original solution to 0.2 μg / L, which met the emission standard of <2 μg / L thallium. Then acid was added to adjust the pH to 7-9 for emission. The thallium removal effect was ≥99.5%.

[0032] (5) The sediment at the bottom of the deep cone thickener is filtered, and the residue after filtration is safely disposed of.

[0033] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0034] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A rainwater thallium removal integrated device, comprising a collection tank (1), a treatment mixing tank (2), an aeration oxidation tank (3), a first deep cone thickener (4), a filter press (5), and an outlet water tank (6); characterized in that: The collection tank (1), the treatment mixing tank (2), the aeration oxidation tank (3), and the first deep cone thickener (4) are connected in series on the same pipe; the concentrated liquid outlet of the first deep cone thickener (4) is connected to the liquid inlet of the filter press (5), and the clear liquid outlet of the first deep cone thickener (4) is connected to the outlet water tank (6). The liquid outlet of the filter press (5) is returned to the treatment mixing tank (2) through the return pipe (8). The aeration oxidation tank (3) is equipped with multiple aeration mechanisms, including a venturi tube (9), an air inlet pipe (10) at the throat of the venturi tube (9), a liquid inlet pipe (11) connected to the inlet contraction section of the venturi tube (9), a liquid outlet pipe (12) connected to the diffusion recovery section of the venturi tube, and a circulation pump (13) in the aeration oxidation tank (3). The liquid outlet of the circulation pump (13) is connected to the liquid inlet pipe (11) via a liquid guide pipe (14).

2. The device of claim 1, wherein: It also includes a dosing tank (7) for adding chemicals into the treatment mixing tank (2).

3. The integrated rainwater thallium removal device according to claim 1, characterized in that: A second deep cone thickener (15) is connected in series between the first deep cone thickener (4) and the outlet water tank (6). The concentrated liquid outlet of the second deep cone thickener (15) is connected to the inlet of the filter press (5), and the clear liquid outlet of the second deep cone thickener (15) is connected to the outlet water tank (6). The clear liquid outlet of the first deep cone thickener (4) is connected to the inlet of the second deep cone thickener (15).

4. The device of claim 1, wherein: The liquid outlet pipe (12) is also provided with guide jet pipes (16) at both ends.

5. The integrated rainwater thallium removal device according to claim 4, characterized in that: The guide tube (16) is set at an angle downwards.

6. The integrated rainwater thallium removal device of claim 1, wherein: The side wall of the liquid outlet pipe (12) is also provided with swirl fins (17).

7. The integrated rainwater thallium removal device of claim 1, wherein: The air intake pipe (10) is equipped with a dust filter cover.

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