Aluminum foil wastewater resourceful treatment system and method

Abstract

The application discloses an aluminum foil wastewater resource treatment system and method, and belongs to the field of wastewater treatment. The aluminum foil wastewater resource treatment system comprises, in sequence along a treatment direction, a wastewater collecting pool, a pretreatment device, an ultrafiltration system, a nanofiltration system, a neutralization reaction pool, a filter, a washer, a dryer and a calcining furnace. The water outlet of the nanofiltration system is communicated with the recovery pool. The pretreatment device comprises a box body, a stirring assembly, an air pump, a first hose, a dosing pump and a second hose. The stirring end of the stirring assembly is located in the interior of the box body. The air outlet end of the air pump is fixedly communicated with the first hose. The air outlet end of the first hose is located in the interior of the box body. The medicine outlet end of the dosing pump is fixedly communicated with the second hose. The medicine outlet end of the second hose is located in the interior of the box body. The medicine inlet end of the dosing pump is communicated with an external medicine source. The application realizes resource treatment of aluminum foil wastewater, recovers hydrochloric acid and aluminum metal, and the water quality can meet environmental protection requirements.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment, and particularly relates to a system and method for the resource-based treatment of aluminum foil wastewater. Background Technology

[0002] Aluminum foil, due to its excellent barrier properties, thermal conductivity, flexibility, and recyclability, is widely used in many fields such as food packaging, electronics, pharmaceuticals, and construction. With the continuous growth in demand for aluminum foil from various industries, the scale of aluminum foil production is expanding daily. However, the aluminum foil production process generates a large amount of wastewater. If not effectively treated and recycled, it will not only cause serious environmental pollution but also lead to a significant waste of resources.

[0003] Aluminum foil wastewater has a complex composition, with major pollutants including hydrochloric acid, metallic aluminum (existing in the form of aluminum ions), suspended solids, grease, and other organic impurities. The presence of these pollutants makes aluminum foil wastewater highly acidic and has a high chemical oxygen demand (COD). Direct discharge of such wastewater would cause serious harm to aquatic ecosystems, soil, and groundwater.

[0004] Traditional aluminum foil wastewater treatment methods fail to effectively recover and utilize hydrochloric acid and metallic aluminum resources, resulting in resource waste. Furthermore, traditional methods often struggle to completely remove organic impurities from the wastewater, leading to effluent quality that fails to meet increasingly stringent environmental protection requirements. Summary of the Invention

[0005] The purpose of this invention is to provide an aluminum foil wastewater resource utilization treatment system and method to overcome at least one of the above-mentioned defects in the prior art.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The aluminum foil wastewater resource utilization treatment system provided by this invention includes a wastewater collection tank, a pretreatment device, an ultrafiltration system, a nanofiltration system, a neutralization reaction tank, a filter, a scrubber, a dryer, and a calcining furnace arranged sequentially along the treatment direction. The product water outlet of the nanofiltration system is connected to the recovery tank. The pretreatment device includes a tank, a stirring assembly, an air pump, a first hose, a dosing pump, and a second hose. The air pump, the stirring assembly, and the dosing pump are fixedly fixed on the top of the tank from left to right. The stirring end of the stirring assembly is located inside the tank. The air outlet of the air pump is fixedly connected to the first hose, and the air outlet of the first hose is located inside the tank. The dosing pump's dosing end is fixedly connected to the second hose, and the dosing end of the second hose is located inside the tank. The dosing pump's dosing inlet is connected to an external chemical source.

[0008] Preferably, the assembly further includes a first slide rail, a first slider, a first vertical tube, a first hollow annular seat, a second vertical tube, and a second hollow annular seat. The first slide rail is fixed to both the left and right side walls of the upper part of the housing. The first slider is slidably connected to the inner side of the first slide rail. The first vertical tube is fixed to the inner side of the first slider. The bottom end of the first vertical tube is fixedly connected to the first hollow annular seat. The top end of the first vertical tube on the left side is fixedly connected to the bottom end of the first flexible tube. The top end of the first vertical tube on the right side is fixedly connected to the bottom end of the second flexible tube. The left and right sides of the bottom wall of the first hollow annular seat are fixedly connected to the second vertical tube. The bottom end of the second vertical tube is fixedly connected to the second hollow annular seat. The inner and outer side walls of the first hollow annular seat each have several first through holes communicating with their inner cavity. The inner and outer side walls of the second hollow annular seat each have several second through holes communicating with their inner cavity.

[0009] Preferably, the stirring assembly includes a motor, a stirring shaft, and a first stirring blade. The motor is fixed to the top of the housing, the stirring shaft is fixed to the bottom of the motor, and the stirring shaft extends into the interior of the housing where the first stirring blade is fixed.

[0010] Preferably, the assembly further includes a sealed box, a first bearing seat, a first bevel gear, a second bearing seat, a second bevel gear, a rotating shaft, and a cam. The sealed box is fixed to the rear side wall of the housing, and the first bearing seat is fixed to the top wall of the sealed box. The stirring shaft passes through the top wall of the sealed box and the first bearing seat, and the first bevel gear is fixed inside the sealed box. The second bearing seats are fixed to both the left and right side walls of the sealed box. The second bevel gear is fixed to the inner end of the rotating shaft, and the second bevel gear meshes with the first bevel gear. The outer end of the rotating shaft passes through the second bearing seat and the side wall of the sealed box, and extends to the outside of the sealed box where a cam is fixed. The cam contacts the bottom wall of the first hollow annular seat. The stirring shaft and the sealed box, as well as the rotating shaft and the sealed box, are sealed together.

[0011] Preferably, two stirring plates are fixed to the inner wall of the cam, and the two stirring plates are located on opposite sides of the rotating shaft.

[0012] Preferably, it also includes a rotating platform, a connecting rod, and a second stirring blade. The rotating platform is fixed between the two second vertical pipes on the left and right. The rotating platform has two rotating ends, and each rotating end is hinged with a connecting rod. The bottom end of the stirring shaft passes through the bottom wall of the sealed box and extends to the lower part of the box. The left and right sides of the bottom end of the stirring shaft are hinged with second stirring blades, and the outer end of the second stirring blade is hinged to the bottom end of the connecting rod.

[0013] Preferably, the rotary table includes an annular slide rail and two second sliders, with the bottom of the annular slide rail slidably connected to the two second sliders, and the top of the connecting rod hinged to the second sliders.

[0014] Preferably, the inner wall of the first hollow annular seat is located outside the first stirring blade, and the inner wall of the second hollow annular seat is located outside the second stirring blade.

[0015] Preferably, a plurality of first through holes are distributed at equal intervals along the circumference of the first hollow annular seat, and a plurality of second through holes are distributed at equal intervals along the circumference of the second hollow annular seat.

[0016] This invention also provides a method for the resource-based treatment of aluminum foil wastewater, which uses the above-mentioned aluminum foil wastewater resource-based treatment system and includes the following steps: aluminum foil wastewater is sent to a wastewater collection tank, and after homogenization and equalization in the wastewater collection tank, it is sent to a pretreatment device for pretreatment. The supernatant after pretreatment is sent to an ultrafiltration system for ultrafiltration treatment. The permeate obtained from ultrafiltration is sent to a nanofiltration system for nanofiltration treatment. The permeate obtained from nanofiltration is sent to a recovery tank to recover hydrochloric acid. The concentrated water obtained from nanofiltration is sent to an electro-neutralization reaction tank. Alkali solution is added to the neutralization reaction tank for neutralization treatment to generate aluminum hydroxide precipitate. The generated aluminum hydroxide precipitate is filtered, washed, and dried, and then placed in a calcination furnace for calcination to obtain metallic aluminum.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. To achieve resource-based treatment of aluminum foil wastewater, recover hydrochloric acid and metallic aluminum, and ensure that the effluent quality meets environmental protection requirements.

[0019] 2. The mixing is achieved through the stirring component, and air can be pumped into the tank through the first hose via an air pump. This increases the dissolved oxygen content in the water, which helps maintain the hydrolysis and polymerization reaction of the coagulant, generating more and more stable active coagulant components, thereby improving the coagulation effect.

[0020] 3. On the one hand, the coagulant can be pumped into the first and second hollow annular seats through the second hose using a dosing pump, and then sprayed out through the first and second through holes for dispersion dosing. This ensures that the coagulant can be quickly and evenly dispersed in the wastewater within the tank. On the other hand, air can be pumped into the first and second hollow annular seats through the first hose using an air pump, and then sprayed out through the first and second through holes, forming bubbles in the water. The rising movement of the bubbles drives the flow of the surrounding water, expanding the range of agitation. In areas where the agitation of the mixing components is weak, the movement of the bubbles can promote thorough mixing of the water and coagulant in these areas, ensuring uniform water quality throughout the tank and creating conditions for efficient coagulation. As the bubbles rise in the water, they carry the surrounding suspended particles along with them, increasing the chances of collision between particles. This helps in the formation and growth of flocs, allowing small flocs to gradually aggregate into larger, denser flocs, thereby improving the settling performance of the flocs.

[0021] 4. By using the first and second hollow annular seats, which are arranged vertically, air and medicine are distributed from different positions, making the air and medicine more evenly dispersed and achieving better results.

[0022] 5. The application of chemicals and the distribution of gas can be carried out simultaneously or separately. When carried out simultaneously, the chemicals and the gas flow will mix in the first and second hollow annular seats before being sprayed out together, which not only improves the coagulation efficiency and enhances the coagulation effect, but also reduces the coagulation treatment time.

[0023] 6. The distribution positions of gas and chemicals can be varied, allowing them to enter the water body at different heights and locations. This avoids excessive concentration in a fixed area or insufficient distribution in localized areas, promoting uniform distribution of chemicals and gas across the entire cross-section of the tank and increasing their contact area and efficiency with the water. It can also create conditions conducive to floc formation in different areas and at different heights.

[0024] 7. The reciprocating motion of the first and second hollow annular seats will generate additional water flow disturbances in the water body, which will be superimposed on the water flow generated by the stirring components to form a more complex flow field.

[0025] 8. The rotation of the first stirring blade will cause the water to rotate and flow in a plane; while the rotation of the stirring plate will cause the water to flow in a direction perpendicular to it. The combination of the two will form a complex three-dimensional flow field in the coagulation tank.

[0026] 9. The second stirring blade can rotate and oscillate simultaneously. The rotation of the second stirring blade ensures uniform horizontal dispersion of the coagulant, while the vertical oscillation propels the agent into full contact with the water. The vertical oscillation of the second stirring blade generates complex water flow motion, promoting the formation of tiny eddies and turbulent regions in the water, thereby accelerating floc formation. Furthermore, it subjectes the flocs to continuous forces from different directions during formation, resulting in a more compact and stable internal structure.

[0027] 10. No additional driving force is required. Through the ingenious design and linkage of the structure of this application, only one motor is needed as the driving source to realize the change of the gas distribution and drug distribution position while performing the stirring operation, forming a complex three-dimensional flow field and driving the second stirring blade to rotate and oscillate.

[0028] 11. The relative positions of the first hollow annular seat, the second hollow annular seat, the first stirring blade, and the second stirring blade, combined with the placement of the first and second through holes, allow for the purging of the first and second stirring blades. This prevents flocculent matter and impurities from adhering to and accumulating on the surfaces of the first and second stirring blades, maintaining cleanliness and ensuring normal operation. Furthermore, it allows the air and chemical distribution positions to be closer to the mainstream field area generated by the first and second stirring blades, enabling air and chemicals to be rapidly dispersed throughout the water body, significantly improving the efficiency and uniformity of air and chemical distribution.

[0029] 12. The arrangement of the first and second through holes makes the air and drug distribution more uniform. The uniform air and drug distribution and good mixing effect make the formed flocs more uniform and dense, and the settling performance better. Attached Figure Description

[0030] Figure 1 This is a system block diagram of the present invention.

[0031] Figure 2 This is a schematic diagram of the main structure of the preprocessing equipment of the present invention (first state).

[0032] Figure 3 This is a partial structural schematic diagram of the present invention.

[0033] Figure 4 This is a cross-sectional structural schematic diagram of the first vertical tube, the first hollow annular seat, the second vertical tube, and the second hollow annular seat of the present invention.

[0034] Figure 5 This is a side view of the rotating shaft, cam, and stirring plate of the present invention.

[0035] Figure 6 This is a schematic diagram of the cooperative structure of the rotary table, connecting rod, second stirring blade, and stirring shaft of the present invention.

[0036] Figure 7 This is a schematic diagram of the main structure of the preprocessing equipment of the present invention (second state).

[0037] The labels in the attached diagram are as follows: 100-Wastewater collection tank, 200-Pretreatment equipment, 300-Ultrafiltration system, 400-Nanofiltration system, 500-Recovery tank, 600-Neutralization reaction tank, 700-Filter, 800-Scrubber, 900-Dryer, 1000-Calcination furnace, 1-Box body, 2-Air pump, 3-Agitator assembly, 4-First hose, 5-Dosing pump, 6-Second hose, 7-First slide rail, 8-First slider, 9-First vertical pipe, 10-First hollow ring 11-Second vertical tube, 12-Second hollow annular seat, 13-First through hole, 14-Second through hole, 31-Motor, 32-Stirring shaft, 33-First stirring blade, 15-Sealing box, 16-First bearing seat, 17-First bevel gear, 18-Second bearing seat, 19-Second bevel gear, 20-Rotating shaft, 21-Cam, 22-Stirring plate, 23-Rotating table, 24-Connecting rod, 25-Second stirring blade, 231-Annular slide rail, 232-Second slider. Detailed Implementation

[0038] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0039] Contents not described in detail in this specification are prior art known to those skilled in the art. In the description of this invention, it should be understood that terms such as "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0040] like Figures 1 to 7As shown, the aluminum foil wastewater resource utilization treatment system provided in this embodiment includes a wastewater collection tank 100, a pretreatment device 200, an ultrafiltration system 300, a nanofiltration system 400, a neutralization reaction tank 600, a filter 700, a scrubber 800, a dryer 900, and a calcining furnace 1000 arranged sequentially along the treatment direction. The product water outlet of the nanofiltration system 400 is connected to the recovery tank 500. The pretreatment device 200 includes a housing 1, a stirring assembly 3, an air pump 2, a first hose 4, a dosing pump 5, and a second hose 6. The air pump 2, the stirring assembly 3, and the dosing pump 5 are fixedly fixed on the top of the housing 1 from left to right. The stirring end of the stirring assembly 3 is located inside the housing 1. The air outlet of the air pump 2 is fixedly connected to the first hose 4, and the air outlet of the first hose 4 is located inside the housing 1. The dosing outlet of the dosing pump 5 is fixedly connected to the second hose 6, and the dosing outlet of the second hose 6 is located inside the housing 1. The dosing inlet of the dosing pump 5 is connected to an external chemical source.

[0041] This embodiment also provides a method for the resource recovery treatment of aluminum foil wastewater, which uses the above-mentioned aluminum foil wastewater resource recovery treatment system and includes the following steps:

[0042] Aluminum foil wastewater (mainly containing 1% HCl and 6% aluminum chloride) is sent to wastewater collection tank 100. After homogenization and equalization in wastewater collection tank 100 for a period of time, it is sent to pretreatment equipment 200. Coagulant is added for pretreatment, causing colloids, fine suspended solids and other impurities in the wastewater to coagulate into larger particles and be removed. The supernatant after pretreatment is sent to ultrafiltration system 300 for ultrafiltration treatment. Because pretreatment is carried out before ultrafiltration, most of the colloids, fine suspended solids and other impurities are removed, reducing the amount of impurities entering ultrafiltration system 300, thereby reducing the risk of ultrafiltration membrane fouling, extending the service life of ultrafiltration membrane, and reducing the frequency of membrane cleaning and replacement. After pretreatment, most of the suspended and some dissolved pollutants in the wastewater are removed before entering ultrafiltration system 300 for further filtration. Ultrafiltration system 300 can effectively intercept the remaining suspended solids, colloids, large molecular organic matter, etc., thereby ensuring the water quality of ultrafiltration permeate. The permeate from ultrafiltration is fed into nanofiltration system 400 for further treatment. Driven by pressure differential, divalent and polyvalent ions in the wastewater are retained, resulting in hydrochloric acid being the primary permeate through the nanofiltration membrane. This achieves the separation and purification of hydrochloric acid. The permeate from nanofiltration is then sent to recovery tank 500 to recover the hydrochloric acid for reuse in the workshop. Since divalent and polyvalent ions are retained on the concentrate side of nanofiltration system 400, the concentrate is primarily a concentrated aluminum chloride solution. Nanofiltration system 400 removes small-molecule organic matter from the wastewater, working in conjunction with ultrafiltration system 300 to thoroughly remove organic impurities. The concentrate from nanofiltration is then sent to neutralization reactor 600, where sodium hydroxide solution is added for neutralization, generating aluminum hydroxide precipitate. The precipitate is filtered, washed, and dried, then calcined in calcination furnace 1000 to obtain metallic aluminum. In this way, the wastewater from aluminum foil can be treated in a resource-efficient manner, recovering hydrochloric acid and metallic aluminum, and the effluent quality can meet environmental protection requirements.

[0043] The mixing is achieved by stirring component 3, and air can be introduced into tank 1 through first hose 4 via air pump 2. This increases the dissolved oxygen content in the water, helps maintain the hydrolysis and polymerization reaction of coagulant, generates more and more stable active coagulant components, and thus improves the coagulation effect.

[0044] The enclosure includes a first slide rail 7, a first slider 8, a first vertical tube 9, a first hollow annular seat 10, a second vertical tube 11, and a second hollow annular seat 12. The first slide rail 7 is fixed to the upper left and right side walls of the housing 1. The first slider 8 is slidably connected to the inner side of the first slide rail 7. The first vertical tube 9 is fixed to the inner side of the first slider 8. The bottom end of the first vertical tube 9 is fixedly connected to the first hollow annular seat 10. The top end of the first vertical tube 9 on the left side is fixedly connected to the bottom end of the first flexible tube 4. The top end of the first vertical tube 9 on the right side is fixedly connected to the bottom end of the second flexible tube 6. The second vertical tube 11 is fixedly connected to the left and right sides of the bottom wall of the first hollow annular seat 10. The bottom end of the second vertical tube 11 is fixedly connected to the second hollow annular seat 12. The inner and outer side walls of the first hollow annular seat 10 have several first through holes 13 communicating with its inner cavity. The inner and outer side walls of the second hollow annular seat 12 have several second through holes 14 communicating with its inner cavity.

[0045] On one hand, the coagulant can be pumped into the first hollow annular seat 10 and the second hollow annular seat 12 through the second hose 6 using the dosing pump 5, and then sprayed out through the first through hole 13 and the second through hole 14 for dispersion dosing. This ensures that the coagulant can be quickly and evenly dispersed in the wastewater within the tank 1. On the other hand, air can be pumped into the first hollow annular seat 10 and the second hollow annular seat 12 through the first hose 4 using the air pump 2, and then sprayed out through the first through hole 13 and the second through hole 14, forming bubbles in the water. The rising movement of the bubbles drives the flow of the surrounding water, expanding the range of the mixing effect. In areas where the mixing effect of the mixing component 3 is weak, the movement of the bubbles can promote thorough mixing of the water and coagulant in these areas, ensuring uniform water quality throughout the tank 1 and creating conditions for efficient coagulation. As the bubbles rise in the water, they carry the surrounding suspended particles along with them, increasing the chances of collision between particles. This helps in the formation and growth of flocs, allowing small flocs to gradually aggregate into larger and denser flocs, thereby improving the settling performance of the flocs. Furthermore, the first hollow annular seat 10 and the second hollow annular seat 12, positioned vertically, distribute air and chemicals from different locations, resulting in more comprehensive and uniform dispersion of air and chemicals, leading to better performance. Chemical and air distribution can be performed simultaneously or separately. When performed simultaneously, the chemicals and airflow are mixed within the first hollow annular seat 10 and the second hollow annular seat 12 before being sprayed out together, which not only improves coagulation efficiency and enhances the coagulation effect but also reduces coagulation treatment time.

[0046] The mixing assembly 3 includes a motor 31, a mixing shaft 32, and a first mixing blade 33. The motor 31 is fixed to the top of the housing 1, and the mixing shaft 32 is fixed to the bottom of the motor 31. The mixing shaft 32 extends into the interior of the housing 1 and the first mixing blade 33 is fixed thereon. When the motor 31 rotates, it drives the mixing shaft 32 to rotate, which in turn causes the first mixing blade 33 to rotate. The rotating first mixing blade, combined with the air distribution and chemical distribution of the first hollow annular seat 10 and the second hollow annular seat 12, effectively improves the coagulation efficiency and coagulation effect.

[0047] The system also includes a sealed box 15, a first bearing seat 16, a first bevel gear 17, a second bearing seat 18, a second bevel gear 19, a rotating shaft 20, and a cam 21. The sealed box 15 is fixed to the rear side wall of the box body 1. The first bearing seat 16 is fixed to the top wall of the sealed box 15. The stirring shaft 32 passes through the top wall of the sealed box 15 and the first bearing seat 16, and the first bevel gear 17 is fixed inside the sealed box 15. The second bearing seat 18 is fixed to both the left and right side walls inside the sealed box 15. The second bevel gear 19 is fixed to the inner end of the rotating shaft 20 and meshes with the first bevel gear 17. The outer end of the rotating shaft 20 passes through the second bearing seat 18 and the side wall of the sealed box 15, and extends to the outside of the sealed box 15 where the cam 21 is fixed. The cam 21 contacts the bottom wall of the first hollow annular seat 10. The stirring shaft 32 and the sealed box 15, as well as the rotating shaft 20 and the sealed box 15, are sealed together.

[0048] The rotation of the stirring shaft 32 drives the first bevel gear 17 to rotate, which in turn drives the second bevel gear 19 to rotate, causing the rotating shaft 20 to rotate, which in turn drives the cam 21 to rotate. During rotation, the cam 21 pushes the first hollow annular seat 10 to move up and down, causing the second hollow annular seat 12 to move up and down as well. This changes the gas and chemical distribution positions, allowing the gas and chemicals to enter the water body at different heights and positions. This avoids excessive concentration in a fixed area or insufficient distribution in a localized area, promoting uniform distribution of chemicals and gases across the entire cross-section of the tank 1, and increasing their contact area and efficiency with the water. The reciprocating motion of the first hollow annular seat 10 and the second hollow annular seat 12 generates additional water flow disturbances in the water body, which, combined with the water flow generated by the stirring assembly 3, forms a more complex flow field. This complex flow field increases the turbulence of the water body, allowing for more thorough mixing between different parts of the water, promoting rapid and uniform mixing of chemicals, gases, and wastewater, and enhancing the coagulation reaction. However, the stirring effect of the stirring assembly 3 may have certain limitations, and the stirring effect may be weaker in some areas. The up-and-down movement of the first hollow annular seat 10 and the second hollow annular seat 12 can compensate for this deficiency, extending the aeration and chemical distribution range to areas where the stirring component 3 is weaker, ensuring that the water in the entire tank 1 is fully stirred and mixed, thus improving the overall treatment effect. By changing the aeration and chemical distribution positions, conditions favorable for floc formation can be created in different areas and at different heights. The combined advantages of these factors accelerate the coagulation reaction, improve the formation and sedimentation of flocs, thereby shortening the entire coagulation process time, increasing treatment efficiency, treating more wastewater per unit time, and reducing treatment costs. Furthermore, no additional driving force is required; through the ingenious design and linkage of this application's structure, only one motor 31 is needed as the driving source to achieve the change of aeration and chemical distribution positions while performing stirring operations. The first slider 8 and the first slide rail 7 ensure the smoothness of the lifting and lowering process of the first hollow annular seat 10 and the second hollow annular seat 12.

[0049] Two stirring plates 22 are fixed to the inner wall of the cam 21, located on opposite sides of the rotating shaft 20. As the cam 21 rotates, it drives the two stirring plates 22 to rotate as well. The rotation of the first stirring blade 33 causes the water to rotate and flow in a plane; while the rotation of the stirring plates 22 causes water to flow in a direction perpendicular to it. The combination of these two factors creates a complex three-dimensional flow field in the coagulation tank. This complex flow field breaks the laminar flow state that may exist in the water, resulting in stronger mixing between different parts of the water, promoting full contact between the coagulant and the wastewater, and improving the uniformity and efficiency of mixing. The stirring in different directions causes suspended particles in the water to be subjected to forces in different directions, increasing the collision frequency between particles. More collision opportunities contribute to the formation and growth of flocs, allowing small flocs to gradually aggregate into larger, denser flocs, thereby improving the flocculation effect.

[0050] The system also includes a rotating platform 23, a connecting rod 24, and second stirring blades 25. The rotating platform 23 is fixed between two second vertical pipes 11 on the left and right sides. The rotating platform 23 has two rotating ends, each of which is hinged to a connecting rod 24. The bottom end of the stirring shaft 32 passes through the bottom wall of the sealed box 15 and extends to the lower part of the box body 1. Second stirring blades 25 are hinged to both sides of the bottom end of the stirring shaft 32. The outer end of the second stirring blade 25 is hinged to the bottom end of the connecting rod 24. The rotating platform 23 includes an annular slide rail 231 and two second sliders 232. The bottom of the annular slide rail 231 is slidably connected to the two second sliders 232, and the top end of the connecting rod 24 is hinged to the second sliders 232.

[0051] Initially, the proximal end of cam 21 contacts the bottom wall of the first hollow annular seat 10, the first stirring blade 33 is located above the first hollow annular seat 10, the stirring plate 22 is located below the first hollow annular seat 10, and the second stirring blade 25 is inclined downwards, with part of it located inside the second hollow annular seat 12 and the other part located below the first hollow annular seat 10. This allows for mixing operations at different positions within the housing 1, resulting in more comprehensive mixing. During mixing, the stirring shaft 32 drives the first stirring blade 33 and the second stirring blade 25 to rotate, which in turn drives the cam 21 to move the first hollow annular seat 10 and its upper structure up and down, and the stirring plate 22 follows the rotation of the cam 21. Simultaneously, the up-and-down movement of the second vertical pipe 11 drives the rotary table 23 to move up and down, which in turn drives the second stirring blade 25 to oscillate up and down via the connecting rod 24. The rotation of the second stirring blade 25 allows the coagulant to be evenly dispersed in the horizontal direction, while the up-and-down oscillation ensures full contact between the agent and the water in the vertical direction. This breaks down any potential concentration gradients in the water body at vertical levels, allowing the coagulant to diffuse rapidly and evenly throughout the entire water body. It avoids localized areas of excessively high or low concentrations, ensuring thorough mixing of wastewater and coagulant throughout tank 1, creating favorable conditions for subsequent coagulation. The reciprocating oscillation of the second stirring blade 25 generates complex water flow motions, promoting the formation of tiny eddies and turbulent regions in the water. These minute water flow changes increase the collision frequency between particles, allowing coagulant molecules to come into more thorough contact and collide with suspended particles in the water, thereby accelerating floc formation. The reciprocating oscillation also subjectes the flocs to forces from different directions during formation, resulting in a more compact and stable internal structure.

[0052] The inner wall of the first hollow annular seat 10 is located outside the first stirring blade 33, and the inner wall of the second hollow annular seat 12 is located outside the second stirring blade 25. Combined with the arrangement of the first through hole 13 and the second through hole 14, the first stirring blade 33 and the second stirring blade 25 can be purged, preventing flocs and impurities from adhering to and accumulating on their surfaces, maintaining cleanliness, and ensuring normal operation. Furthermore, this allows the air and chemical distribution positions to be closer to the mainstream field area generated by the first stirring blade 33 and the second stirring blade 25, enabling air and chemicals to be rapidly dispersed to all parts of the water body, greatly improving the efficiency and uniformity of air and chemical distribution.

[0053] The first through holes 13 are evenly spaced along the circumference of the first hollow annular seat 10, and the second through holes 14 are evenly spaced along the circumference of the second hollow annular seat 12. The arrangement of the first through holes 13 and the second through holes 14 makes the air and drug distribution more uniform. The uniform air and drug distribution and the good mixing effect make the formed flocs more uniform and dense, and the settling performance better.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aluminum foil wastewater resource utilization treatment system, characterized in that: It includes a wastewater collection tank, pretreatment equipment, ultrafiltration system, nanofiltration system, neutralization reaction tank, filter, scrubber, dryer, and calcining furnace arranged sequentially along the treatment direction; The product water outlet of the nanofiltration system is connected to the recovery tank; The pretreatment equipment includes a housing, a stirring assembly, an air pump, a first hose, a dosing pump, and a second hose; From left to right, an air pump, a stirring assembly, and a dosing pump are fixed to the top of the box. The stirring end of the stirring assembly is located inside the housing; The air pump has a first hose fixedly connected to its outlet end, and the outlet end of the first hose is located inside the housing. The dosing pump has a fixed connection to a second hose at its outlet, the outlet of which is located inside the housing, and the dosing pump has a connection to an external drug source at its inlet. It also includes a first slide rail, a first slider, a first vertical tube, a first hollow annular seat, a second vertical tube, and a second hollow annular seat; The upper left and right side walls of the box are both fixed with first slide rails, and the inner side of the first slide rails is slidably connected with a first slider. A first vertical tube is fixed to the inner side of the first slider, and a first hollow annular seat is fixedly connected to the bottom end of the first vertical tube. The top end of the first vertical tube on the left side is fixedly connected to the bottom end of the first flexible tube, and the top end of the first vertical tube on the right side is fixedly connected to the bottom end of the second flexible tube. The bottom wall of the first hollow annular seat is fixedly connected to the left and right sides of the second vertical tube, and the bottom end of the second vertical tube is fixedly connected to the second hollow annular seat. The inner and outer side walls of the first hollow annular seat each have several first through holes communicating with their inner cavities. The inner and outer side walls of the second hollow annular seat each have several second through holes communicating with their inner cavity; The stirring assembly includes a motor, a stirring shaft, and a first stirring blade; A motor is fixed to the top of the box, a stirring shaft is fixed to the bottom of the motor, and a first stirring blade is fixed to the inside of the box extending from the stirring shaft. It also includes a sealing box, a first bearing housing, a first bevel gear, a second bearing housing, a second bevel gear, a rotating shaft, and a cam; A sealed box is fixed to the rear side wall of the box; A first bearing seat is fixed to the top wall of the sealed box, the stirring shaft passes through the top wall of the sealed box and the first bearing seat, and a first bevel gear is fixed inside the sealed box; The left and right side walls of the sealed box are each fixed with a second bearing seat. The inner end of the rotating shaft is fixed with a second bevel gear. The second bevel gear meshes with the first bevel gear. The outer end of the rotating shaft passes through the second bearing seat and the side wall of the sealed box, and extends to the outside of the sealed box where a cam is fixed. The cam contacts the bottom wall of the first hollow annular seat; The stirring shaft and the sealing box, as well as the rotating shaft and the sealing box, are all sealed together. Two stirring plates are fixed to the inner wall of the cam; The two stirring plates are located on opposite sides of the rotating shaft.

2. The aluminum foil wastewater resource utilization treatment system according to claim 1, characterized in that: It also includes a rotary table, a connecting rod, and a second stirring blade; The rotating platform is fixed between the two second vertical pipes on the left and right sides; The rotary table has two rotating ends, and each rotating end is hinged with a connecting rod; The bottom end of the stirring shaft passes through the bottom wall of the sealed box and extends to the lower part of the box body; The bottom of the stirring shaft is hinged to the left and right sides, and the outer end of the second stirring blade is hinged to the bottom end of the connecting rod.

3. The aluminum foil wastewater resource utilization treatment system according to claim 2, characterized in that: The rotary table includes an annular slide rail and two second sliders; The bottom of the annular slide rail is slidably connected to two second sliders; The top end of the connecting rod is hinged to the second slider.

4. The aluminum foil wastewater resource utilization treatment system according to claim 3, characterized in that: The inner wall of the first hollow annular seat is located on the outer side of the first stirring blade; The inner wall of the second hollow annular seat is located outside the second stirring blade.

5. The aluminum foil wastewater resource utilization treatment system according to claim 1, characterized in that: Several of the first through holes are distributed at equal intervals along the circumference of the first hollow annular seat; Several second through holes are distributed at equal intervals along the circumference of the second hollow annular seat.

6. A method for resource-based treatment of aluminum foil wastewater, characterized in that, The aluminum foil wastewater resource utilization treatment system according to any one of claims 1-5 is used for treatment, including the following steps: Aluminum foil wastewater is sent to a wastewater collection tank. After homogenization and equalization in the wastewater collection tank, it is sent to a pretreatment device for pretreatment. The supernatant after pretreatment is sent to an ultrafiltration system for ultrafiltration treatment. The permeate obtained from ultrafiltration is sent to a nanofiltration system for nanofiltration treatment. The permeate obtained from nanofiltration is sent to a recovery tank to recover hydrochloric acid. The concentrated water obtained from nanofiltration is sent to an electro-neutralization reaction tank. Alkali solution is added to the neutralization reaction tank for neutralization treatment, generating aluminum hydroxide precipitate. The generated aluminum hydroxide precipitate is filtered, washed, and dried, and then placed in a calcination furnace for calcination to obtain metallic aluminum.

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