Membrane concentration system for lithium battery wastewater

Abstract

The utility model provides a lithium battery wastewater membrane concentration system, which comprises an adjusting and accident pool, an integrated two-section coagulative precipitation device, an air floatation device, an absorption filter and a clean water pool which are sequentially connected, one side of the integrated two-section coagulative precipitation device is further connected with a sludge pool, one side of the sludge pool is connected with a sludge dewatering machine, and the other side of the sludge pool is connected with an air floatation device. The integrated two-stage coagulating sedimentation device comprises a first-stage reaction tank, a first-stage sedimentation tank, a second-stage reaction tank and a second-stage sedimentation tank, and stirring components for mixing and stirring chemical agents are arranged in the first-stage reaction tank and the second-stage reaction tank. The chemical precipitation method has the advantages of being suitable for high-concentration fluorine-containing wastewater, high in treatment efficiency and low in agent cost, and two-stage flocculation precipitation treatment is used as follow-up treatment of adjustment and accident pool chemical treatment, so that the whole treatment has the characteristics of being high in treatment efficiency, low in effluent fluoride content, stable in effluent quality and the like.

Description

Technical Field

[0001] The utility model relates to the field of wastewater treatment equipment, in particular to a lithium battery wastewater membrane concentration system. Background Art

[0002] During the manufacturing process of lithium batteries, a large amount of acidic heavy metal industrial wastewater is generated. The main source of the wastewater is a part of the wastewater containing fluorides generated during the production process in the workshop, mainly fluorides. Therefore, the wastewater must be effectively treated before reaching the discharge standard.

[0003] Currently, for the common technology of wastewater treatment, the flocculation precipitation method is used to remove the target substances in the water. Flocculation precipitation is to add flocculants (such as polyaluminum oxide, iron salts, etc.) to promote the collision and aggregation of fine suspended particles in the water, forming larger flocs. These flocs are easy to settle under the action of gravity due to the increase in volume. Flocculants can promote the interaction between particles through charge neutralization, adsorption bridging, etc., and improve the precipitation efficiency. This process is widely used in fields such as drinking water treatment and sewage treatment.

[0004] However, currently, before wastewater treatment, the types and dosages of flocculants are adjusted and added to the accident pool in advance for precipitation, and then a certain amount of sludge is generated and the sludge is treated. The treatment of high-concentration fluoride-containing wastewater is not thorough, resulting in a high fluoride content in the effluent and low treatment efficiency.

[0005] Therefore, it is necessary to provide a new lithium battery wastewater membrane concentration system to solve the above technical problems. Content of the Utility Model

[0006] To solve the above technical problems, the utility model provides a lithium battery wastewater membrane concentration system.

[0007] The lithium battery wastewater membrane concentration system provided by the utility model includes an adjustment and accident pool, an integrated two-stage coagulation and precipitation device, a flotation device, an absorption filter, and a clear water pool, which are connected in sequence. One side of the integrated two-stage coagulation and precipitation device is also connected to a sludge pool, and one side of the sludge pool is connected to a sludge dehydrator;

[0008] The integrated two-stage coagulation and precipitation device includes a first-stage reaction tank, a first-stage sedimentation tank, a second-stage reaction tank, and a second-stage sedimentation tank. Stirring components for mixing and stirring chemical agents are provided in both the first-stage reaction tank and the second-stage reaction tank. A sewage discharge chamber is provided between the first-stage reaction tank and the first-stage sedimentation tank, and the sewage discharge chamber is connected to the inner cavity of the sludge pool. Grid plates are provided in both the first-stage sedimentation tank and the second-stage sedimentation tank. The cavity at the bottom of the first-stage sedimentation tank is connected to the sewage discharge chamber. An overflow trough is provided on one side of the top of the first-stage sedimentation tank, and the bottom of the overflow trough is connected to the inner cavity of the second-stage reaction tank.

[0009] Further, the air flotation device includes a dissolved air tank, a dissolved air equipment, and an intermediate water tank. The dissolved air tank is connected to the inner cavity of the secondary sedimentation tank. The dissolved air tank is divided into two independent chambers by a partition. One side of the dissolved air tank is provided with a liquid extraction assembly for extracting dissolved air liquid. One end of the liquid extraction assembly is connected to the dissolved air equipment. One of the chambers is connected to the inner cavity of the intermediate water tank through a connecting pipe with a valve. The dissolved air equipment is located in the chamber connected to the intermediate water tank.

[0010] Further, the dissolved air equipment includes a main pipeline and a plurality of branch pipes. The main pipeline is connected to the liquid extraction assembly. The bottoms of the plurality of branch pipes are respectively located at one-third of the distance from the bottom wall of the dissolved air tank. Sprayers are provided at the bottoms of the plurality of branch pipes.

[0011] Further, the liquid extraction assembly includes a liquid extraction pump, a mixing tank, and a liquid delivery pipe. Two ends of the liquid extraction pump are respectively connected to one of the chambers of the dissolved air tank and the mixing tank. Two ends of the liquid delivery pipe are respectively connected to the mixing tank and the other chamber of the dissolved air tank.

[0012] Further, the number of the absorption filters is two, and regenerators are provided on both of the two absorption filters.

[0013] Further, the stirring assembly includes a mounting frame, a driving motor, a shaft rod, and a stirring disk. The mounting frame is fixedly installed on the inner wall of the first reaction tank or the second reaction tank. The driving motor is fixedly installed on the top of the mounting frame. The rotor end of the driving motor is fixedly connected to the top of the shaft rod. The stirring disk is fixedly installed at the bottom of the shaft rod.

[0014] Compared with the related art, the lithium-ion battery wastewater membrane concentration system provided by the present utility model has the following beneficial effects:

[0015] The present utility model combines traditional chemical precipitation, flocculation precipitation, and air flotation filtration for wastewater treatment. That is, it utilizes the advantages of the chemical precipitation method, which is suitable for high-concentration fluoride-containing wastewater, with high treatment efficiency and low chemical agent cost. The two-stage flocculation precipitation treatment is used as the subsequent treatment of the chemical treatment in the regulating and accident pool, overcoming the disadvantage of incomplete fluoride treatment in the former, and giving play to its own advantages in treating low-concentration wastewater, making the whole treatment process have the characteristics of high treatment efficiency, low operating cost, low fluoride content in the effluent, and stable effluent quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the lithium-ion battery wastewater membrane concentration system provided by the present utility model;

[0017] Figure 2 is the cross-sectional structural schematic diagram of the integrated two-stage coagulation and precipitation device provided by the present utility model;

[0018] Figure 3 Structural schematic diagram of the primary reaction tank and the primary sedimentation tank provided by the present utility model Figure 1 ;

[0019] Figure 4 Structural schematic diagram of the primary reaction tank and the primary sedimentation tank provided by the present utility model Figure 2 ;

[0020] Figure 5 Structural schematic diagram of the air flotation device provided by the present utility model.

[0021] Reference numerals in the figure: 1, regulating and accident tank; 2, air flotation device; 3, absorption filter; 4, clear water tank; 5, sludge tank; 6, sludge dewatering machine; 7, primary reaction tank; 8, primary sedimentation tank; 9, secondary reaction tank; 10, secondary sedimentation tank; 11, sewage chamber; 12, grid plate; 13, overflow trough; 14, dissolved air tank; 15, intermediate water tank; 16, partition board; 17, connecting pipe; 18, main pipeline; 19, branch pipe; 20, spray head; 21, liquid extraction pump; 22, mixing tank; 23, liquid delivery pipe; 24, mounting rack; 25, driving motor; 26, shaft rod; 27, stirring disk. Specific embodiments

[0022] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 , where Figure 1 is the overall structural schematic diagram of the lithium-ion battery wastewater membrane concentration system provided by the present utility model; Figure 2 is the sectional structural schematic diagram of the integrated two-stage coagulation sedimentation device provided by the present utility model; Figure 3 is the structural schematic diagram of the primary reaction tank and the primary sedimentation tank provided by the present utility model Figure 1 ; Figure 4 is the structural schematic diagram of the primary reaction tank and the primary sedimentation tank provided by the present utility model Figure 2 ; Figure 5 is the structural schematic diagram of the air flotation device provided by the present utility model.

[0024] In the specific implementation process, as Figures 1 - 5 shown, the lithium-ion battery wastewater membrane concentration system includes a regulating and accident tank 1, an integrated two-stage coagulation sedimentation device, an air flotation device 2, an absorption filter 3, and a clear water tank 4 connected in sequence. One side of the integrated two-stage coagulation sedimentation device is also connected to a sludge tank 5, and one side of the sludge tank 5 is connected to a sludge dewatering machine 6;

[0025] The integrated two-stage coagulation sedimentation device includes a primary reaction tank 7, a primary sedimentation tank 8, a secondary reaction tank 9, and a secondary sedimentation tank 10. Stirring components for mixing and stirring chemical agents are provided in both the primary reaction tank 7 and the secondary reaction tank 9. A sewage chamber 11 is provided between the primary reaction tank 7 and the primary sedimentation tank 8, and the sewage chamber 11 is connected to the inner cavity of the sludge tank 5. Grid plates 12 are provided in both the primary sedimentation tank 8 and the secondary sedimentation tank 10. The cavity at the bottom of the primary sedimentation tank 8 is connected to the sewage chamber 11. An overflow trough 13 is provided on one side of the top of the primary sedimentation tank 8, and the bottom of the overflow trough 13 is connected to the inner cavity of the secondary reaction tank 9. The traditional chemical precipitation, flocculation precipitation, and air flotation filtration are combined for wastewater treatment. That is, the chemical precipitation method, which is suitable for high-concentration fluoride-containing wastewater with high treatment efficiency and low chemical agent cost, is used. The flocculation precipitation method is used as the subsequent treatment of the chemical precipitation method to overcome the disadvantage of incomplete fluoride treatment of the former and give play to its own advantages in treating low-concentration wastewater, making the entire treatment process have the characteristics of high treatment efficiency, low operating cost, low fluoride content in the effluent, and stable effluent quality.

[0026] In a specific embodiment, the stirring component includes a mounting frame 24, a driving motor 25, a shaft rod 26, and a stirring disk 27. The mounting frame 24 is fixedly installed on the inner wall of the primary reaction tank 7 or the secondary reaction tank 9. The driving motor 25 is fixedly installed on the top of the mounting frame 24. The rotor end of the driving motor 25 is fixedly connected to the top of the shaft rod 26. The stirring disk 27 is fixedly installed at the bottom of the shaft rod 26. By starting the driving motor 25, the shaft rod 26 is driven to rotate, and then the stirring disk 27 is driven to rotate by the shaft rod 26.

[0027] It should be noted that each device is added to another device by means of water pump extraction. First, calcium chloride is added to the regulation and accident tank 1 for pH adjustment, and then it is pumped into the primary reaction tank 7. Lime milk is added to the primary reaction tank 7 and mixed and stirred by the stirring component. Then, the liquid after the reaction in the primary reaction tank 7 is pumped into the primary sedimentation tank 8 for flocculation precipitation treatment. After precipitation, it is pumped into the secondary reaction tank 9. HC1, PAC, and PAM are respectively added to the secondary reaction tank 9 and mixed and stirred by the stirring component. Then, the liquid after the reaction in the secondary reaction tank 9 is pumped into the secondary sedimentation tank 10 for two-stage flocculation precipitation treatment. The sludge settled at the bottom of the primary sedimentation tank 8 and the secondary sedimentation tank 10 is discharged into the sludge tank 5 and dehydrated by the sludge dehydrator 6, and then the sludge is transported out for treatment. In addition, the liquid at the top of the secondary sedimentation tank 10 is pumped into the air flotation device 2.

[0028] The air flotation device 2 includes a dissolved air tank 14, a dissolved air equipment, and an intermediate water tank 15. The dissolved air tank 14 is communicated with the inner cavity of the secondary sedimentation tank 10. The dissolved air tank 14 is divided into two independent chambers by a partition plate 16. One side of the dissolved air tank 14 is provided with a liquid pumping component for pumping the dissolved air liquid. One end of the liquid pumping component is connected to the dissolved air equipment. One of the chambers is communicated with the inner cavity of the intermediate water tank 15 through a connecting pipe 17 with a valve. The dissolved air equipment is located in the chamber communicated with the intermediate water tank 15.

[0029] The dissolved air equipment includes a main pipeline 18 and a plurality of branch pipes 19. The main pipeline 18 is connected to the liquid pumping component. The bottoms of the plurality of branch pipes 19 are respectively located at one-third of the distance from the bottom wall of the dissolved air tank 14. Sprayers 20 are provided at the bottoms of the plurality of branch pipes 19.

[0030] It should be noted that the dissolved air equipment also has an aerator for increasing the amount of bubbles in the dissolved air tank 14.

[0031] The liquid pumping component disperses the dissolved air liquid through the main pipeline 18 and flows it to the vicinity of the bottom wall of the dissolved air tank 14 through the plurality of branch pipes 19 and the sprayers 20. After the dissolved air tank 14 has been subjected to dissolved air treatment for a period of time, the valve on the connecting pipe 17 is opened to allow the liquid in the dissolved air tank 14 to flow into the intermediate water tank 15.

[0032] The liquid pumping component includes a liquid pumping pump 21, a mixing tank 22, and a liquid delivery pipe 23. The two ends of the liquid pumping pump 21 are respectively connected to one of the chambers of the dissolved air tank 14 and the mixing tank 22. The two ends of the liquid delivery pipe 23 are respectively connected to the mixing tank 22 and the other chamber of the dissolved air tank 14. By starting the liquid pumping pump 21, the dissolved air liquid in the dissolved air tank 14 is pumped into the mixing tank 22, and then discharged from the mixing tank 22 into the main pipeline 18 through the liquid delivery pipe 23.

[0033] The number of the absorption filters 3 is two, and regenerators are provided on both of the two absorption filters 3 for absorbing and filtering the liquid impurities in the intermediate water tank 15.

[0034] The working principle provided by the present utility model is as follows: First, calcium chloride is added to the regulation and accident pool 1 for pH adjustment, and then it is pumped into the first reaction pool 7. Lime milk is added to the first reaction pool 7 and mixed and stirred through the stirring assembly. Then, the liquid after the reaction in the first reaction pool 7 is pumped into the first sedimentation tank 8 for flocculation sedimentation treatment. After sedimentation, it is pumped into the second reaction pool 9. In the second reaction pool 9, HC1, PAC, and PAM are respectively added and mixed and stirred through the stirring assembly. Then, the liquid after the reaction in the second reaction pool 9 is pumped into the second sedimentation tank 10 for two-stage flocculation sedimentation treatment. The sludge settling at the bottom of the first sedimentation tank 8 and the second sedimentation tank 10 is discharged into the sludge tank 5 and dewatered by the sludge dewatering machine 6, and then the sludge is transported out for treatment. In addition, the liquid at the top of the second sedimentation tank 10 is pumped into the air flotation device 2. The dissolved air liquid in the dissolved air tank 14 is pumped into the mixing tank 22 by starting the liquid pumping pump 21, and then discharged from the mixing tank 22 into the main pipeline 18 through the liquid delivery pipe 23. The dissolved air liquid is dispersed through the main pipeline 18 and flows to the bottom wall of the dissolved air tank 14 adjacent to the dissolved air tank 14 through a plurality of branch pipes 19 and nozzles 20. After the dissolved air tank 14 has carried out the dissolved air treatment for a period of time, the valve on the connecting pipe 17 is opened to make the liquid in the dissolved air tank 14 flow into the intermediate water tank 15. The number of the absorption filters 3 is two, and regenerators are provided on both of the two absorption filters 3 for absorbing and filtering the liquid impurities in the intermediate water tank 15.

[0035] The circuits and controls involved in the present utility model are all prior arts and will not be elaborated here too much.

[0036] The above are only the embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present utility model.

Claims

1. A lithium battery wastewater membrane concentration system, characterized in that: It comprises a regulating and emergency tank (1), an integrated two-stage coagulation and sedimentation device, an air flotation device (2), an absorption filter (3) and a clear water tank (4) which are connected in sequence, one side of the integrated two-stage coagulation and sedimentation device is also connected to a sludge tank (5), and one side of the sludge tank (5) is connected to a sludge dewatering machine (6); The integrated two-stage coagulation and sedimentation device comprises a primary reaction tank (7), a primary sedimentation tank (8), a secondary reaction tank (9) and a secondary sedimentation tank (10). The primary reaction tank (7) and the secondary reaction tank (9) are both provided with stirring components for mixing and stirring chemical agents. A sewage discharge chamber (11) is provided between the primary reaction tank (7) and the primary sedimentation tank (8). The sewage discharge chamber (11) is connected to the inner cavity of the sludge tank (5). The primary sedimentation tank (8) and the secondary sedimentation tank (10) are both provided with grid plates (12). The cavity at the bottom of the primary sedimentation tank (8) is connected to the sewage discharge chamber (11). An overflow groove (13) is provided on one side of the top of the primary sedimentation tank (8). The bottom of the overflow groove (13) is connected to the inner cavity of the secondary reaction tank (9).

2. The lithium battery wastewater membrane concentration system according to claim 1, characterized in that: The flotation device (2) comprises an air dissolving tank (14), an air dissolving device and an intermediate water tank (15); the air dissolving tank (14) is connected to the inner cavity of the secondary sedimentation tank (10); the air dissolving tank (14) is divided into two independent chambers by a partition (16); a liquid extraction component for extracting air-dissolving liquid is provided on one side of the air dissolving tank (14); one end of the liquid extraction component is connected to the air dissolving device; one of the chambers is connected to the inner cavity of the intermediate water tank (15) via a connecting pipe (17) with a valve; and the air dissolving device is located in the chamber connected to the intermediate water tank (15).

3. The lithium battery wastewater membrane concentration system according to claim 2 is characterized in that: The gas dissolving equipment comprises a main pipeline (18) and a plurality of branch pipes (19), wherein the main pipeline (18) is connected to the liquid extraction component, and the bottoms of the plurality of branch pipes (19) are respectively located at one third of the distance from the bottom wall of the gas dissolving pool (14), and nozzles (20) are provided at the bottoms of the plurality of branch pipes (19).

4. The lithium battery wastewater membrane concentration system according to claim 3 is characterized in that: The liquid extraction component comprises a liquid extraction pump (21), a mixing box (22) and a liquid delivery pipe (23); two ends of the liquid extraction pump (21) are respectively connected to one chamber of the dissolved gas pool (14) and the mixing box (22); two ends of the liquid delivery pipe (23) are respectively connected to the mixing box (22) and the other chamber of the dissolved gas pool (14).

5. The lithium battery wastewater membrane concentration system according to claim 4, characterized in that: The number of the absorption filters (3) is two, and both absorption filters (3) are provided with a regenerator.

6. The lithium battery wastewater membrane concentration system according to claim 5, characterized in that: The stirring assembly comprises a mounting frame (24), a driving motor (25), a shaft (26) and a stirring plate (27); the mounting frame (24) is fixedly mounted on the inner wall of the primary reaction tank (7) or the secondary reaction tank (9); the driving motor (25) is fixedly mounted on the top of the mounting frame (24); the rotor end of the driving motor (25) is fixedly connected to the top of the shaft (26); and the stirring plate (27) is fixedly mounted on the bottom of the shaft (26).

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