Nickel-containing wastewater treatment system
By combining a reaction tank, coagulation tank, flocculation tank, and sedimentation tank, the system solves the problem of poor floc sedimentation caused by fluctuations in nickel ion content in lithium-ion battery wastewater, achieving highly efficient wastewater treatment.
Patent Information
- Application Number
- CN202423228695.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2034-12-26
AI Technical Summary
Traditional inclined tube sedimentation tanks cannot quickly adapt to fluctuations in nickel ion content when treating lithium-ion battery wastewater, resulting in poor floc settling and affecting wastewater treatment efficiency.
A combined system of reaction tank, coagulation tank, flocculation tank and sedimentation tank is adopted. The amount of floc in the flocculation tank is adjusted by the return pipe and hydrocyclone. Combined with the addition of micro sand and the monitoring of mud level gauge, the sedimentation process is optimized and the sedimentation effect is enhanced.
It improves the flexibility and effectiveness of wastewater treatment, reduces the content of heavy metal ions, reduces the formation of scum, and achieves adaptive treatment to fluctuations in nickel ion content.
Smart Images
Figure CN223737860U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of sewage treatment systems, in particular to a nickel-containing wastewater treatment system. BACKGROUND
[0002] Lithium battery wastewater is wastewater containing various pollutants generated during the production of lithium ion batteries and related processes. Lithium ion batteries have the advantages of high energy density and long service life, and are widely used in electronic devices, electric vehicles and other fields. With the increasing demand for lithium ion batteries, the problem of lithium ion wastewater treatment has also attracted increasing attention.
[0003] The traditional wastewater treatment process mainly includes the following steps: first, the wastewater is concentrated in the oil removal tank, and the extraction liquid is added to the oil removal tank, and the oil is first removed by extraction. The wastewater after oil removal enters the collection tank, and then enters the inclined tube sedimentation tank for sludge sedimentation. The sludge after sedimentation enters the compressor for concentration to become filter residue, and the Ni ions in the filter residue are reused.
[0004] The inclined tube sedimentation tank mainly promotes the sedimentation of impurities through the inclined tube in the tank. The inclined tube sedimentation tank mainly utilizes the principle of shallow layer sedimentation to realize the sedimentation of solid impurities in wastewater. However, in actual use, the impurities in the wastewater in the inclined tube sedimentation tank can also be understood as sediment (mainly including flocculation and silt). The content fluctuates greatly. When the nickel ions in the wastewater are less, the flocculation sedimentation effect is poor, and the traditional inclined tube sedimentation tank cannot quickly adapt to the sudden change of the amount of sediment in different wastewater, resulting in poor flocculation sedimentation effect, and ultimately leading to unqualified treated wastewater. CONTENT OF THE INVENTION
[0005] In order to improve the flexibility in the wastewater treatment process and improve the effect of wastewater treatment, the present application provides a nickel-containing wastewater treatment system.
[0006] The nickel-containing wastewater treatment system provided by the present application adopts the following technical scheme:
[0007] A nickel-containing wastewater treatment system, comprising a reaction tank, a coagulation tank, a flocculation tank and a sedimentation tank arranged in sequence, wherein the sedimentation tank is provided with a sludge discharge port, the sludge discharge port is provided with a transportation pipeline, the transportation pipeline is provided with a reflux pipeline, one end of the reflux pipeline is communicated with the transportation pipeline, and the other end of the reflux pipeline is communicated with the flocculation tank.
[0008] By adopting the technical scheme, if the nickel ions in the wastewater are low, the flocculation pool generates less flocculation, at this time, the precipitates (micro sand and sludge) in the sedimentation pool are all backflowed to the flocculation pool through the backflow pipeline to assist the flocculation to settle, so that the content of heavy metal ions in the effluent of the subsequent sedimentation pool can be reduced, and the effect of wastewater treatment can be improved. Moreover, the wastewater treatment system can adapt to the characteristics that the content of heavy metal ions in the lithium battery wastewater fluctuates greatly. When the nickel ions are high, the flocculation pool has more flocculation, and it does not need too much sand to assist the settlement, at this time, the precipitates in the sedimentation pool can be discharged through the conveying pipeline.
[0009] Optionally, the flocculation pool is provided with a sand adding port, through which micro sand can be added to the flocculation pool.
[0010] By adopting the technical scheme, the micro sand is added to the flocculation pool to assist the flocculation to settle, so that the weight of the precipitates is increased, and the precipitates are not easy to mix with the floating oil to reduce the generation of scum.
[0011] Optionally, the conveying pipeline is provided with a hydrocyclone at an end away from the sludge discharge port, the conveying pipeline is in communication with a water inlet of the hydrocyclone, and the lower end of the hydrocyclone is in communication with the flocculation pool.
[0012] By adopting the technical scheme, the micro sand in the precipitates is separated by the hydrocyclone, which can reduce the abrasion of the pipeline caused by the micro sand in the subsequent conveying process, and the micro sand can be recycled.
[0013] Optionally, the sedimentation pool is provided with a sludge level meter for detecting the height of the precipitates.
[0014] By adopting the technical scheme, the height of the sludge in the sedimentation pool is measured by the sludge level meter, so that the amount of flocculation can be reflected, and whether the sludge is backflowed can be determined according to the amount of flocculation, which is convenient for the staff to judge.
[0015] Optionally, the sedimentation pool is provided with a skimming pipe for collecting the scum on the water surface of the sedimentation pool, and the skimming pipe comprises a skimming pipe horizontally arranged, and an opening is arranged on the side of the skimming pipe away from the ground.
[0016] By adopting the technical scheme, in the wastewater treatment process, the water flow flows from the reaction pool to the direction close to the sedimentation pool, and in the process of water flow, the scum is intercepted into the skimming pipe when passing through the opening on the skimming pipe, so that the scum is collected, and the effect of wastewater treatment is further improved.
[0017] Optionally, the skimming pipe is rotationally connected to the sedimentation pool, and rotating the skimming pipe can make the opening on the skimming pipe face the ground.
[0018] By adopting the technical scheme, after a certain amount of dross is collected in the dross pipe, the dross pipe can be rotated to make the opening downward, and under the action of gravity, the dross can be automatically precipitated downward, so as to be discharged together with the sludge.
[0019] Optionally, the dross skimming pipe further comprises a driving assembly for driving the dross pipe to rotate, the driving assembly comprising a worm wheel and a worm, the worm wheel being coaxial with the rotation axis of the dross pipe, and the worm being vertically arranged and engaged with the worm wheel, the worm being rotationally connected to the sedimentation tank, and the worm being capable of driving the worm wheel to rotate by rotating.
[0020] By adopting the technical scheme, the position of the dross pipe is adjusted by rotating the worm wheel driven by the worm, and meanwhile, the self-locking property between the worm wheel and the worm is utilized to make the dross pipe more stable during use.
[0021] Optionally, the worm is provided with a hand wheel.
[0022] By adopting the technical scheme, the hand wheel is provided to facilitate the staff to rotate the worm.
[0023] In summary, the present application has at least one of the following beneficial technical effects:
[0024] The reaction zone is provided with a dosing pipe to control the addition ratio of lye and sodium, destroy the stable state of complex nickel ions, and oxidize the divalent nickel ions into trivalent nickel ions, so as to form trivalent nickel ion precipitate, remove the complex nickel ions, and also accelerate the reaction rate, and the trivalent nickel ion precipitate is heavier than the divalent nickel ion precipitate and is less likely to combine with floating oil;
[0025] The coagulation zone is provided with a sand inlet, and the addition of micro-sand can increase the settling speed of solid particles, increase the weight of the precipitate, and slow down the generation of dross;
[0026] The dross skimming pipe can effectively handle the situation of dross and floating oil in the sedimentation zone, which is beneficial to sludge recovery. BRIEF DESCRIPTION OF DRAWINGS
[0027] Figure 1 is a plan flowchart of an embodiment of the present application.
[0028] Figure 2 is a schematic diagram of the overall structure of an embodiment of the present application.
[0029] Figure 3 is an enlarged view of part A of the embodiment of the present application. Figure 2
[0030] The figure marks: 1, reaction tank; 11, water inlet; 12, dosing pipe; 13, connecting hole; 2, coagulation tank; 3, flocculation tank; 31, flow guide cylinder; 4, sedimentation tank; 5, hydrocyclone; 51, conveying pipeline; 52, backflow pipeline; 6, mud level gauge; 7, skimming pipe; 71, deslagging pipe; 72, driving assembly; 73, worm gear; 74, worm. DETAILED DESCRIPTION
[0031] The following will be described in detail with reference to the accompanying drawings. Figures 1-3 The present application is further described in detail.
[0032] The embodiment of the present application discloses a treatment system for nickel-containing wastewater.
[0033] Referring to Figure 1 and Figure 2 , the treatment system for nickel-containing wastewater comprises a plurality of treatment tanks, which are four treatment tanks in the embodiment. The four treatment tanks are reaction tank 1, coagulation tank 2, flocculation tank 3 and sedimentation tank 4 in turn. The connecting holes 13 are arranged between the reaction tank 1, the coagulation tank 2, the flocculation tank 3 and the sedimentation tank 4, so that the plurality of treatment tanks are communicated with each other. The connecting hole 13 between the reaction tank 1 and the coagulation tank 2 is located close to the ground, the connecting hole 13 between the coagulation tank 2 and the flocculation tank 3 is located away from the ground, and the connecting hole 13 between the flocculation tank 3 and the sedimentation tank 4 is located away from the ground.
[0034] Referring to Figure 1 and Figure 2 , the water inlet 11 is further arranged on the reaction tank 1, and the water inlet 11 is connected with a wastewater source, so as to facilitate the wastewater to enter the reaction tank 1. The dosing pipe 12 is further arranged on the reaction tank 1, and the end of the dosing pipe 12 extends to the inside of the reaction tank 1, which is used for adding chemical reagents, which are lye and sodium in the embodiment, into the reaction tank 1 after the wastewater enters the reaction tank 1. The lye and sodium are mixed in advance, and the ratio of lye to sodium is 1:2. After the wastewater reacts with the reagents, the wastewater enters the coagulation tank 2, and the coagulation tank 2 is also provided with the dosing pipe 12, which is used for adding coagulant into the coagulation tank 2, so as to realize the “deconcealment” of particles in the wastewater. Then, the wastewater enters the flocculation tank 3, and the flocculation tank 3 is provided with the dosing pipe 12 for adding flocculant, so as to facilitate the flocculation of the particles. The sedimentation tank 4 is an inclined tube sedimentation tank 4, which utilizes the inclined tube to promote the sedimentation of impurities.
[0035] Referring to Figure 1 and Figure 2 , the flocculation tank 3 is provided with a sand adding port, and micro sand is added into the flocculation tank 3, so as to increase the sedimentation of solid particles, increase the weight of the sediment, make it not easy to mix with floating oil, and reduce the generation of scum.
[0036] Referring to Figure 1 and Figure 2, the flocculation tank 3 is also provided with a flow guide cylinder 31 (Yihai Environmental Protection YH), and the end of the flocculant feeding pipe 12 extends below the flow guide cylinder 31. The water in the flocculation tank 3 flows from top to bottom through the flow guide cylinder 31 to improve the mixing effect of the wastewater and the flocculant. The flow guide cylinder mainly includes a vertical cylinder and a stirrer. The vertical cylinder is vertically arranged, and the lower end is provided with a gradually enlarged bell mouth. The inside of the vertical cylinder is provided with a spiral plate with an axis parallel to the vertical cylinder. The stirrer is generally a impeller rotatingly connected to the top of the vertical cylinder (or a water pump can also be provided, mainly for driving the water flow downward), and its rotating axis is perpendicular to the ground. During the rotation of the impeller, the water inside the impeller moves downward, thereby realizing the following circulation: the water inside the flow guide cylinder 31 moves upward, the water near the bottom of the outer wall of the flow guide cylinder 31 moves outward, and a complete circulation is formed.
[0037] Referring to Figure 1 and Figure 2 , the nickel-containing wastewater treatment system further comprises a hydrocyclone 5, a transport pipeline 51 is arranged between the feed inlet of the hydrocyclone 5 and the sludge discharge port of the sedimentation tank 4, and the two ends of the transport pipeline 51 are respectively connected to the feed inlet of the hydrocyclone 5 and the sludge discharge port of the sedimentation tank 4. The lower end of the hydrocyclone 5 is communicated with the flocculation tank 3. After the wastewater enters the hydrocyclone 5, most of the light sludge is discharged from the upper end of the hydrocyclone 5, and the micro-sand and a small part of the sludge enter the flocculation tank 3, so as to form larger alum flowers in the flocculation tank 3 and facilitate the reuse of the micro-sand.
[0038] Referring to Figure 1 and Figure 2 , a backflow pipeline 52 is arranged on the pipeline between the hydrocyclone 5 and the sedimentation tank 4, one end of the backflow pipeline 52 is communicated with the transport pipeline, and the other end is communicated with the flocculation tank 3. A first electromagnetic valve is arranged on the transport pipeline 51, and a second electromagnetic valve is arranged on the backflow pipeline 52. The first electromagnetic valve is located between the hydrocyclone 5 and the backflow pipeline 52. The nickel ion content of the influent (i.e. the wastewater entering the reaction tank 1) is 30-500 mg / L, which fluctuates greatly, and the amount of flocculation produced by the flocculation tank 3 also changes accordingly. When the nickel ion of the influent is low and the amount of flocculation produced is small, not only the micro-sand backflow is needed to assist the sedimentation, but also a large amount of sludge backflow is needed, and at this time the sludge discharge demand is very small. At this time, the first electromagnetic valve can be closed, the second electromagnetic valve can be opened, the amount of sand backflow can be increased, the amount of flocculation in the flocculation tank 3 can be maintained, and the sedimentation of the flocculation can be facilitated.
[0039] Referring to Figure 1 and Figure 2 , a sludge level meter 6 (Hengrui HR7301) for measuring the sludge level in the sedimentation tank 4 is arranged in the sedimentation tank 4, so as to observe the sludge level in the sedimentation tank 4 and further judge the amount of flocculation in the flocculation tank 3. During the wastewater treatment process, the pipeline switching between the hydrocyclone 5 and the backflow pipeline 52 can be determined according to the sludge level, and the specific process is as follows:
[0040] That is, when the sludge level height > high limit: open the first electromagnetic valve, close the second electromagnetic valve, the sludge enters the cyclone pipeline, most of the sludge is discharged from the upper end of the cyclone, and the micro-sand and a small part of the sludge in the sludge enter the underflow outlet at the lower end of the hydrocyclone 5, and then enter the flocculation tank 3;
[0041] When the sludge level height < low limit: open the second electromagnetic valve, close the first electromagnetic valve, the sludge enters the reflux pipeline, and the sludge and micro-sand are all refluxed to the flocculation tank 3.
[0042] With reference to Figure 1 and Figure 2 , the skimming pipe 7 (PY300 produced by Shiyuan Technology) is arranged at the position close to the flocculation tank 3 of the sedimentation tank 4, and the floating sludge on the water surface of the sedimentation tank 4 is collected and cleaned through the skimming pipe 7. The skimming pipe 7 mainly has a deslagging pipe 71 and a driving assembly 72. The deslagging pipe 71 is in a whole circular cylindrical structure, and an opening is arranged on the side wall of the deslagging pipe 71. During the deslagging process, the water flows in the direction perpendicular to the deslagging pipe 71, the floating sludge located above is intercepted and stored in the deslagging pipe 71. After the deslagging pipe 71 collects enough floating sludge, the deslagging pipe 71 is rotated so that the opening thereof faces downward, and the floating sludge automatically moves downward under the action of gravity, so that it is deposited at the bottom of the tank.
[0043] With reference to Figure 2 and Figure 3 Figure 2 Figure 3 , the driving assembly 72 is used for driving the deslagging pipe 71 to rotate. In the embodiment, the driving assembly 72 includes a worm gear 73 and a worm shaft 74, and the worm gear 73 is coaxially and fixedly connected to the end portion of the deslagging pipe 71. The worm shaft 74 is vertically arranged and rotationally connected to the side wall of the sedimentation tank 4. The worm gear 73 is engaged with the worm shaft 74, and rotating the worm shaft 74 can drive the worm gear 73 to rotate, so as to adjust the position of the deslagging pipe 71. Meanwhile, the self-locking property between the worm gear 73 and the worm shaft 74 is utilized to improve the stability of the skimming pipe 7 during use. A hand wheel is arranged on the worm shaft 74, so as to facilitate the staff to rotate the worm shaft 74.
[0044] The implementation principle of the treatment system for the nickel-containing wastewater in the embodiment is that the reflux pipeline 52 is arranged, so that the staff can make the sludge reflux under the condition that the flocculation body is less, so as to keep a certain amount of flocculation body in the flocculation tank 3 and promote the flocculation body to settle.
[0045] The above are the preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.
Claims
1. A system for treating nickel-containing wastewater, comprising a reaction tank (1), a coagulation tank (2), a flocculation tank (3) and a sedimentation tank (4) arranged in sequence, characterized in that, The sedimentation tank (4) is provided with a sludge discharge port, the sludge discharge port is provided with a conveying pipeline (51), the conveying pipeline (51) is provided with a reflux pipeline (52), one end of the reflux pipeline (52) is communicated with the conveying pipeline (51) and the other end is communicated with the flocculation tank (3); The flocculation tank (3) is provided with a sand adding port, and the flocculation tank (3) can be added to the flocculation tank (3); The reaction tank (1) is also provided with a dosing pipe (12), the dosing pipe (12) extends to the inside of the reaction tank (1), and is used for adding chemical agents to the reaction tank (1) after the wastewater enters the reaction tank (1).
2. The system for treating nickel-containing wastewater according to claim 1, wherein The conveying pipeline (51) is provided with a hydrocyclone (5) away from the sludge discharge port, the conveying pipeline (51) is communicated with the water inlet (11) of the hydrocyclone (5), and the lower end of the hydrocyclone (5) is communicated with the flocculation tank (3).
3. The system for treating nickel-containing wastewater according to claim 2, wherein The sedimentation tank (4) is provided with a sludge level meter (6) for detecting the height of the sediment.
4. The system for treating nickel-containing wastewater according to claim 1, wherein The sedimentation tank (4) is provided with a skimming pipe (7) for collecting floating dregs on the water surface of the sedimentation tank (4), the skimming pipe (7) comprises a horizontal skimming pipe (71), and the side of the skimming pipe (71) away from the ground is provided with an opening.
5. The system for treating nickel-containing wastewater according to claim 4, wherein The skimming pipe (71) is rotatably connected to the sedimentation tank (4), and rotating the skimming pipe (71) can make the opening on the skimming pipe (71) face the ground.
6. The system for treating nickel-containing wastewater according to claim 5, wherein The skimming pipe (7) further comprises a driving assembly (72) for rotating the skimming pipe (71), the driving assembly (72) comprises a worm wheel (73) and a worm (74), the worm wheel (73) is coaxial with the rotation axis of the skimming pipe (71), the worm (74) is vertically arranged and engaged with the worm wheel (73), the worm (74) is rotatably connected to the sedimentation tank (4), and rotating the worm (74) can drive the worm wheel (73) to rotate.
7. The system for treating nickel-containing wastewater according to claim 6, wherein The worm (74) is provided with a hand wheel.