A wastewater resourceful treatment system and method

Abstract

The application discloses a wastewater resource treatment system and method, and belongs to the field of wastewater treatment. The system comprises reaction equipment, reverse osmosis equipment and bipolar membrane electrodialysis equipment arranged in sequence along a treatment direction. The supernatant outlet of the reaction equipment is communicated with the reverse osmosis equipment through a pipeline. The concentrated water outlet of the reverse osmosis equipment is communicated with the bipolar membrane electrodialysis equipment through a pipeline. The reaction equipment comprises a box body, a partition plate, a first stirring assembly, a second stirring assembly, a transmission assembly, a coagulant feeder and a lye feeder. The first stirring assembly and the second stirring assembly are drivingly connected through the transmission assembly. The stirring end of the first stirring assembly extends into a coagulation zone. The stirring end of the second stirring assembly extends into a neutralization zone. The coagulant feeder is communicated with the coagulation zone. The lye feeder is communicated with the neutralization zone. The lye outlet of the bipolar membrane electrodialysis equipment is communicated with the lye feeder through a pipeline. The application not only achieves zero wastewater discharge, but also recovers acid and alkali.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment, and particularly relates to a wastewater resource utilization system and method. Background Technology

[0002] There are various existing wastewater resource treatment methods, each with its own specific application scenarios and advantages and disadvantages.

[0003] For acidic wastewater, neutralization is a common method. Neutralization involves adding alkaline substances, such as sodium hydroxide or calcium hydroxide, to neutralize the acid and alkali in the wastewater, thereby raising the pH value to meet discharge standards. This method is simple and easy to implement, but it generates a large amount of salt waste that requires further treatment. Furthermore, acidic wastewater contains not only acidic substances but also suspended solids and colloidal substances. If alkali is added directly for neutralization, these suspended solids and colloidal substances will negatively impact the neutralization reaction, resulting in poor reaction efficiency and the presence of impurities, which is detrimental to subsequent treatment. Summary of the Invention

[0004] The purpose of this invention is to provide a wastewater resource utilization treatment system and method to overcome at least one of the above-mentioned defects in the prior art.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] This invention provides a wastewater resource recovery system, comprising a reaction device, a reverse osmosis device, and a bipolar membrane electrodialysis device arranged sequentially along the treatment direction. The upper clear liquid outlet of the reaction device is connected to the reverse osmosis device via a pipeline, and the concentrated water outlet of the reverse osmosis device is connected to the bipolar membrane electrodialysis device via a pipeline. The reaction device includes a tank, a partition, a first stirring assembly, a second stirring assembly, a transmission assembly, a coagulant dosing device, and an alkali dosing device. The tank has an internal partition that divides the internal space of the tank into a coagulation zone and a neutralization zone. A water passage is provided between the partition and the top wall of the tank. The first stirring assembly and the second stirring assembly are fixed to the top of the tank and are connected by a transmission assembly. The stirring end of the first stirring assembly extends into the coagulation zone, and the stirring end of the second stirring assembly extends into the neutralization zone. The coagulant dosing device is connected to the coagulation zone, and the alkali dosing device is connected to the neutralization zone. The alkali outlet of the bipolar membrane electrodialysis device is connected to the alkali dosing device via a pipeline.

[0007] Preferably, the product water outlet of the reverse osmosis equipment is connected to the recovery chamber of the bipolar membrane electrodialysis equipment via a pipeline, and the brine outlet of the bipolar membrane electrodialysis equipment is connected to the reverse osmosis equipment via a pipeline.

[0008] Preferably, the first stirring assembly includes a first mounting frame, a second mounting frame, a motor, a first rotating shaft, a first bearing seat, an annular seat, a first gear, a first connecting frame, a second bearing seat, a second rotating shaft, a first gear, a lifting component, a first stirring blade, and a second stirring blade. The top wall of the housing has an opening. The first mounting frame is fixed to the top of the housing. The second mounting frame and the first bearing seat are both fixed to the top of the first mounting frame. The annular seat is fixed to the inner top wall of the first mounting frame. The motor is fixed to the second mounting frame. The bottom end of the motor is fixed with a first rotating shaft. The bottom end of the first rotating shaft passes through the first bearing seat and the first gear. A mounting bracket has a top wall, annular seat, and opening, and a first stirring blade is fixed to the inner bottom of the coagulation zone. A first connecting frame is symmetrically fixed on the left and right sides of the upper part of the first rotating shaft. A second bearing seat is fixed to the top of the first connecting frame. The second rotating shaft is inserted into the second bearing seat. A first gear is fixed to the second rotating shaft. A number of first teeth are arranged around the bottom wall of the annular seat in its circumference. The first teeth mesh with the first gear. A lifting component is fixed to the first rotating shaft and connected to the outer end of the second rotating shaft. A second stirring blade is fixed to the lifting end of the lifting component. The second stirring blade is located above the first stirring blade.

[0009] Preferably, the length direction of the second stirring blade is perpendicular to the length direction of the first stirring blade.

[0010] Preferably, the lifting component includes a turntable, a swing arm, a lifting rod, a second connecting frame, and a first guide sleeve. The turntable is fixed to the outer end of the second rotating shaft. The swing arm is hinged to the edge of the outer wall of the turntable. The lifting rod is hinged to the bottom end of the swing arm. The second connecting frame is symmetrically fixed to the left and right sides of the upper part of the first rotating shaft. The second connecting frame is located between the first connecting frame and the top wall of the box. The first guide sleeve is fixed to the second connecting frame. The lifting rod passes through the first guide sleeve and extends into the coagulation zone where the second stirring blade is fixed.

[0011] Preferably, the first stirring assembly further includes a sealing box, a third bearing seat, a third rotating shaft, a second gear, second teeth, and a third stirring blade. The sealing box is fixed in the middle of the first rotating shaft. The third bearing seat is symmetrically fixed on the left and right sides of the top wall of the sealing box. The inner end of the third rotating shaft is inserted into the third bearing seat. The outer end of the third rotating shaft passes through the side wall of the sealing box and extends to the outside of the sealing box where the third stirring blade is fixed. The second gear is fixed to the third rotating shaft. The lifting rod has a number of second teeth that are equidistantly spaced along its length. The second teeth mesh with the second gear. The first rotating shaft and the sealing box, the lifting rod and the sealing box, and the third rotating shaft and the sealing box are all sealed together.

[0012] Preferably, the second stirring assembly includes a cylinder, a fourth bearing seat, a fourth rotating shaft, a hollow shaft, a fifth bearing seat, a second guide sleeve, a stirring frame, a connecting rod, and a stirring plate. The cylinder and the fourth bearing seat are both fixed to the top of the housing. The top of the cylinder is fixed with the fifth bearing seat. The bottom end of the hollow shaft passes through the fourth bearing seat and the top wall of the housing, and extends into the neutralization zone where the stirring plate is hinged. The second guide sleeve is fitted onto the hollow shaft. The side wall of the second guide sleeve is hinged with the connecting rod. The bottom end of the connecting rod is hinged to the outer end of the stirring plate. The top wall of the stirring frame is fixed to the outer wall of the second guide sleeve. The top end of the fourth rotating shaft is inserted into the fifth bearing seat. The bottom end of the fourth rotating shaft passes through the hollow shaft and extends out to be fixedly connected to the bottom wall of the stirring frame. The stirring plate is located inside the stirring frame.

[0013] Preferably, the two opposite outer walls of the hollow shaft have grooves, and the two opposite inner walls of the second guide sleeve have sliders, which are located in the grooves and slide in cooperation with the grooves.

[0014] Preferably, the transmission assembly includes a driving wheel, a driven wheel, and a transmission belt. The driving wheel is fixed to a first rotating shaft, the driven wheel is fixed to a hollow shaft, and the driving wheel and the driven wheel are connected by a transmission belt.

[0015] This invention also provides a wastewater resource utilization treatment method, which uses the above-mentioned wastewater resource utilization treatment system and includes the following steps: acidic wastewater is sent into a coagulation zone, coagulant is added to the coagulation zone through a coagulant dosing device, and the wastewater is stirred and mixed by a first stirring component to form flocculation sedimentation. The supernatant after coagulation treatment enters the neutralization zone through a water passage, and alkali is added to the neutralization zone through an alkali dosing device. The wastewater is stirred and mixed by a second stirring component to form hydroxide precipitate. The hydroxide precipitate is collected, and the supernatant is sent to a reverse osmosis device for concentration treatment. The concentrated water obtained from the concentration treatment is sent to a bipolar membrane electrodialysis device for treatment to obtain brine, alkali, and acid. The acid is reused in other processes, the alkali is reused in the alkali dosing device, the brine is reused in the reverse osmosis device, and the permeate obtained from the concentration treatment is sent to the recovery chamber of the bipolar membrane electrodialysis device.

[0016] The beneficial effects of this invention are as follows:

[0017] 1. The entire treatment process is wastewater-free, achieving zero wastewater discharge and enabling the resource-based treatment of acidic wastewater. It not only recovers aluminum hydroxide but also recovers acid. The reused sodium hydroxide solution reduces the amount of sodium hydroxide solution used in the neutralization reaction, thus reducing treatment costs. Combined with the setup of the first and second stirring components, the treatment efficiency is greatly improved.

[0018] 2. The mixing effect is enhanced by stirring the mixture in the coagulation zone at different heights using the first and second stirring blades.

[0019] 3. While the second stirring blade rotates, the lifting component drives the second stirring blade to move up and down repeatedly to change its stirring position, which greatly enhances the mixing uniformity of the mixture in the vertical direction and helps to form a denser and more stable floc.

[0020] 4. The length direction of the second stirring blade is perpendicular to the length direction of the first stirring blade, so as to achieve a three-dimensional stirring effect on the mixture, change the local flow field, and ensure that the mixture can be fully mixed at all positions.

[0021] 5. Because the third stirring blade rotates and revolves simultaneously, it can stir the mixture at two different levels of circular motion. Rotation can produce a strong local stirring effect within a smaller circumferential range, ensuring that the mixture near the stirring blade is fully agitated. Revolution, on the other hand, extends this stirring effect to a larger range, ensuring that the mixture is stirred in a wider area, thereby improving the mixing uniformity of the mixture. This combined motion creates a complex flow field in the mixture, which can effectively mix the coagulant and acidic wastewater better.

[0022] 6. Only one motor is needed as the drive source to realize the stirring operation of the first stirring blade, the stirring and lifting operation of the second stirring blade, and the stirring operation of the third stirring blade by rotation and revolution.

[0023] 7. The adjustable height of the stirring frame optimizes the mixing effect; when the height of the stirring frame is lowered, the stirring action is relatively concentrated in the lower layer of the liquid, making the mixing of the lower liquid more intense; raising the height of the stirring frame can allow the stirring action to cover a wider range of liquid depth, promoting the mixing of the entire liquid from top to bottom and avoiding stratification.

[0024] 8. The height adjustment of the stirring frame also adjusts the state of the stirring plate. When the stirring plate is tilted upward, it will generate an upward lifting force on the mixture. This lifting force can effectively turn the mixture at the bottom upward and promote the exchange of liquid between the bottom and the top. When the stirring plate is horizontal, it mainly stirs the mixture in the horizontal direction. This stirring method can effectively mix the mixture evenly at the same height level. When the stirring plate is tilted downward, it will generate a downward force on the mixture, causing the upper mixture to flow downward. Attached Figure Description

[0025] Figure 1 This is a system block diagram of the present invention.

[0026] Figure 2 This is a partial structural schematic diagram of the present invention.

[0027] Figure 3 This is a schematic diagram of the structure of the present invention.

[0028] Figure 4 This is a partial structural schematic diagram of the first stirring component of the present invention.

[0029] Figure 5 This is a bottom view schematic diagram of the annular seat and the first tooth of the present invention.

[0030] Figure 6 This is a cross-sectional structural schematic diagram of the sealing box of the present invention.

[0031] Figure 7 This is a partial structural schematic diagram of the second stirring component of the present invention.

[0032] Figure 8 This is a schematic diagram of the mating structure of the second guide sleeve, slider, groove, and hollow shaft of the present invention.

[0033] The labels in the attached diagram are as follows: 100-Reaction equipment, 200-Reverse osmosis equipment, 300-Bipolar membrane electrodialysis equipment, 1-Box body, 2-Baffle plate, 3-First stirring assembly, 4-Second stirring assembly, 5-Transmission assembly, 6-Coagulant dosing device, 7-Alkali dosing device, 8-Coagulation zone, 9-Neutralization zone, 10-Water passage, 31-First mounting frame, 32-Second mounting frame, 33-Motor, 34-First rotating shaft, 35-First bearing seat, 36-Annular seat, 37-First gear, 38-Lifting component, 39-First connecting frame, 310-Second bearing seat, 311-Second rotating shaft, 312-First gear, 313- 314-Second stirring blade, 381-Turntable, 382-Swing rod, 383-Lifting rod, 384-Second connecting frame, 385-First guide sleeve, 315-Sealing box, 316-Third bearing seat, 317-Third rotating shaft, 318-Second gear, 319-Second tooth, 320-Third stirring blade, 41-Cylinder, 42-Fourth bearing seat, 43-Fourth rotating shaft, 44-Hollow shaft, 45-Fifth bearing seat, 46-Second guide sleeve, 47-Stirring frame, 48-Connecting rod, 49-Stirring plate, 410-Groove, 411-Slider, 51-Driving wheel, 52-Driven wheel, 53-Transmission belt. Detailed Implementation

[0034] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0035] 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.

[0036] like Figures 1 to 8 As shown, this embodiment provides a wastewater resource treatment system, including a reaction device 100, a reverse osmosis device 200, and a bipolar membrane electrodialysis device 300 arranged sequentially along the treatment direction. The upper clear liquid outlet of the reaction device 100 is connected to the reverse osmosis device 200 through a pipe, and the concentrated water outlet of the reverse osmosis device 200 is connected to the bipolar membrane electrodialysis device 300 through a pipe. The reaction device 100 includes a tank 1, a partition 2, a first stirring assembly 3, a second stirring assembly 4, a transmission assembly 5, a coagulant dosing device 6, and an alkali dosing device 7. The tank 1 has a partition 2 inside. A partition 2 divides the internal space of the tank 1 into a coagulation zone 8 and a neutralization zone 9. A water passage 10 is provided between the partition 2 and the inner top wall of the tank 1. A first stirring assembly 3 and a second stirring assembly 4 are fixed to the top of the tank 1. The first stirring assembly 3 and the second stirring assembly 4 are connected by a transmission assembly 5. The stirring end of the first stirring assembly 3 extends into the coagulation zone 8, and the stirring end of the second stirring assembly 4 extends into the neutralization zone 9. A coagulant dosing device 6 is connected to the coagulation zone 8, and an alkali dosing device 7 is connected to the neutralization zone 9. The alkali outlet of the bipolar membrane electrodialysis equipment 300 is connected to the alkali dosing device 7 through a pipe. The permeate outlet of the reverse osmosis equipment 200 is connected to the recovery chamber of the bipolar membrane electrodialysis equipment 300 through a pipe, and the brine outlet of the bipolar membrane electrodialysis equipment 300 is connected to the reverse osmosis equipment 200 through a pipe.

[0037] This embodiment also provides a wastewater resource recovery treatment method, which uses the above-mentioned wastewater resource recovery treatment system for treatment, including the following steps:

[0038] Acidic wastewater is fed into coagulation zone 8, where coagulant is added via coagulant dosing device 6. After mixing by the first stirring component 3, flocculation and sedimentation are formed. The supernatant after coagulation treatment enters neutralization zone 9 through water passage 10, where alkali is added via alkali dosing device 7. After mixing by the second stirring component 4, hydroxide precipitate is formed. The hydroxide precipitate is collected, and the supernatant is sent to reverse osmosis equipment 200 for concentration treatment. The concentrated water is sent to bipolar membrane electrodialysis equipment 300 for treatment to obtain brine, alkali, and acid. The acid is reused in other processes, the alkali is reused in alkali dosing device 7, and the brine is reused in reverse osmosis equipment 200. The permeate obtained from the concentration treatment is sent to the recovery chamber of bipolar membrane electrodialysis equipment 300.

[0039] In this embodiment, the acidic wastewater contains hydrochloric acid and aluminum chloride. By adding a coagulant, suspended solids and colloidal substances in the acidic wastewater are first coagulated into flocs and precipitated, removing some impurities and pollutants from the wastewater, reducing interference with aluminum hydroxide precipitation, and improving the precipitation effect. Then, sodium hydroxide solution is added to react with the hydrochloric acid and aluminum chloride in the acidic wastewater to form sodium chloride solution and aluminum hydroxide precipitate. In this way, the obtained aluminum hydroxide precipitate and sodium chloride solution have higher purity. The combination of the first stirring component 3 and the second stirring component 4 significantly improves processing efficiency. The sodium chloride solution is fed into the reverse osmosis unit 200 for concentration. The concentrated water is then processed by the bipolar membrane electrodialysis unit 300 to obtain three liquids: sodium hydroxide solution, hydrogen chloride solution, and dilute sodium chloride solution. The sodium hydroxide solution is recycled to the alkali dosing device 7, the sodium chloride solution is recycled to the reverse osmosis unit 200, and the hydrogen chloride solution is recycled to other processes. The permeate from the reverse osmosis unit 200 is sent to the recovery chamber of the bipolar membrane electrodialysis unit 300. The entire process involves zero wastewater discharge, achieving not only zero wastewater discharge but also resource recovery of acidic wastewater. It recovers not only aluminum hydroxide but also acid. The recycled sodium hydroxide solution reduces the amount of sodium hydroxide solution used in the neutralization reaction, thus reducing processing costs. By integrating coagulation and neutralization processes into a single unit 1, space occupancy is reduced.

[0040] The first stirring assembly 3 includes a first mounting frame 31, a second mounting frame 32, a motor 33, a first rotating shaft 34, a first bearing seat 35, an annular seat 36, a first gear 37, a first connecting frame 39, a second bearing seat 310, a second rotating shaft 311, a first gear 312, a lifting component 38, a first stirring blade 313, and a second stirring blade 314. The top wall of the housing 1 has an opening. The first mounting frame 31 is fixed to the top of the housing 1. The second mounting frame 32 and the first bearing seat 35 are both fixed to the top of the first mounting frame 31. The annular seat 36 is fixed to the inner top wall of the first mounting frame 31. The motor 33 is fixed to the second mounting frame 32. The bottom end of the motor 33 is fixed with the first rotating shaft 34, and the bottom end of the first rotating shaft 34 passes through the first bearing seat 35. The top wall, annular seat 36, and opening of the first mounting bracket 31, and extending to the inner bottom of the coagulation zone 8, are fixed with a first stirring blade 313. The upper left and right sides of the first rotating shaft 34 are symmetrically fixed with a first connecting bracket 39. The top of the first connecting bracket 39 is fixed with a second bearing seat 310. The second rotating shaft 311 is inserted into the second bearing seat 310. The first gear 312 is fixed to the second rotating shaft 311. The bottom wall of the annular seat 36 is provided with a plurality of first teeth 37 around its circumference. The first teeth 37 mesh with the first gear 312. The lifting member 38 is fixed to the first rotating shaft 34 and connected to the outer end of the second rotating shaft 311. The lifting end of the lifting member 38 is fixed with a second stirring blade 314. The second stirring blade 314 is located above the first stirring blade 313.

[0041] After adding the coagulant, the motor 33 is turned on, driving the first rotating shaft 34 to rotate, which in turn causes the first stirring blade 313 to rotate, mixing the coagulant and acidic wastewater. This ensures the coagulant is evenly dispersed in the acidic wastewater, accelerating the coagulation process and improving treatment efficiency. Simultaneously, the first rotating shaft 34 rotates, driving the lifting component 38 to rotate as well, causing the second stirring blade 314 to rotate and mix. The first and second stirring blades 313 and 314 stir the mixture in the coagulation zone 8 at different heights, enhancing the mixing effect. Furthermore, as the second stirring blade 314 rotates, the lifting component 38 causes it to move up and down repeatedly, changing its stirring position and greatly enhancing the vertical uniformity of the mixture. During coagulation, floc formation requires a suitable environment for particle collision and aggregation. The up-and-down movement of the second stirring blade 314 can change the local water flow velocity and direction, allowing floc particles to move through different water flow environments. On the one hand, when moving upwards, it can carry the flocs that have already begun to form at the bottom to the top, where they can meet smaller particles or flocs, increasing the chances of collision and aggregation between them. On the other hand, when moving downwards, it can carry the flocs from the top to the bottom, preventing the flocs from excessively aggregating at the top and forming a loose structure, thus helping to form a denser and more stable floc.

[0042] The length direction of the second stirring blade 314 is perpendicular to the length direction of the first stirring blade 313. This achieves a three-dimensional stirring effect on the mixture, changes the local flow field, and ensures that the mixture is fully mixed at all locations.

[0043] The lifting component 38 includes a turntable 381, a swing rod 382, ​​a lifting rod 383, a second connecting frame 384, and a first guide sleeve 385. The turntable 381 is fixed to the outer end of the second rotating shaft 311. The swing rod 382 is hinged to the edge of the outer wall of the turntable 381. The lifting rod 383 is hinged to the bottom end of the swing rod 382. The second connecting frame 384 is symmetrically fixed to the left and right sides of the upper part of the first rotating shaft 34. The second connecting frame 384 is located between the first connecting frame 39 and the top wall of the box 1. The first guide sleeve 385 is fixed to the second connecting frame 384. The lifting rod 383 passes through the first guide sleeve 385 and extends into the coagulation zone 8 where the second stirring blade 314 is fixed.

[0044] The rotation of the first rotating shaft 34 drives the first connecting frame 39 to rotate, causing the second bearing seat 310 to rotate. Through the engagement of the first gear 312 and the first tooth 37, the second rotating shaft 311 rotates, driving the turntable 381 to rotate. This causes the swing rod to swing up and down, driving the lifting rod 383 to reciprocate up and down, thereby enabling the second stirring blade 314 to rotate and reciprocate up and down simultaneously. The first guide sleeve 385 ensures the smooth lifting and lowering of the lifting rod 383. Thus, no additional drive source is needed to drive the lifting and lowering; only a single motor 33 is required to achieve not only the stirring operation of the first stirring blade 313 but also the simultaneous stirring and lifting operation of the second stirring blade 314.

[0045] The first stirring assembly 3 further includes a sealing box 315, a third bearing seat 316, a third rotating shaft 317, a second gear 318, second teeth 319, and a third stirring blade 320. The sealing box 315 is fixed in the middle of the first rotating shaft 34. The third bearing seat 316 is symmetrically fixed on the left and right sides of the inner top wall of the sealing box 315. The inner end of the third rotating shaft 317 is inserted into the third bearing seat 316. The outer end of the third rotating shaft 317 passes through the side wall of the sealing box 315 and extends to the outside of the sealing box 315 where the third stirring blade 320 is fixed. The second gear 318 is fixed to the third rotating shaft 317. The lifting rod 383 has a number of second teeth 319 that are equidistantly spaced along its length. The second teeth 319 mesh with the second gear 318. The first rotating shaft 34 and the sealing box 315, the lifting rod 383 and the sealing box 315, and the third rotating shaft 317 and the sealing box 315 are all sealed.

[0046] As the lifting rod 383 rises and falls, it drives the second tooth 319 to move up and down, which in turn drives the second gear 318 to rotate in both directions, causing the third shaft 317 to rotate in both directions, which in turn drives the third stirring blade 320 to rotate in both directions for stirring. The third stirring blade 320 rotates on its own axis around the third shaft 317 and also revolves around the first shaft 34. Because the third stirring blade 320 rotates on its own axis and revolves around the first shaft, it can stir the mixture at two different levels of circular motion. The rotation can produce a strong local stirring effect within a smaller circumferential range, ensuring that the mixture near the stirring blade is fully agitated. The revolution extends this stirring effect to a larger range, ensuring that the mixture is stirred in a wider area, thereby improving the mixing uniformity of the mixture. This combined motion creates a complex flow field in the mixture, which can effectively mix the coagulant and acidic wastewater better. Similarly, the rotation of the third stirring blade 320 does not require an additional drive source. Only one motor 33 is needed as the drive source to realize the stirring operation of the first stirring blade 313, the stirring and lifting operation of the second stirring blade 314 while stirring, and the stirring operation of the third stirring blade 320 by rotation and revolution.

[0047] The second stirring assembly 4 includes a cylinder 41, a fourth bearing seat 42, a fourth rotating shaft 43, a hollow shaft 44, a fifth bearing seat 45, a second guide sleeve 46, a stirring frame 47, a connecting rod 48, and a stirring plate 49. The cylinder 41 and the fourth bearing seat 42 are both fixed to the top of the housing 1. The top of the cylinder 41 is fixed with the fifth bearing seat 45. The bottom end of the hollow shaft 44 passes through the fourth bearing seat 42 and the top wall of the housing 1, and extends into the neutralization zone 9 where the stirring plate is hinged. 49. The second guide sleeve 46 is fitted onto the hollow shaft 44. A connecting rod 48 is hinged to the side wall of the second guide sleeve 46. The bottom end of the connecting rod 48 is hinged to the outer end of the stirring plate 49. The top wall of the stirring frame 47 is fixed to the outer side wall of the second guide sleeve 46. The top end of the fourth rotating shaft 43 is inserted into the fifth bearing seat 45. The bottom end of the fourth rotating shaft 43 passes through the hollow shaft 44 and extends out to be fixedly connected to the bottom wall of the stirring frame 47. The stirring plate 49 is located inside the stirring frame 47.

[0048] The rotation of the first stirring shaft drives the hollow shaft 44 to rotate via the transmission assembly 5, causing the stirring plate 49 and the stirring frame 47 to rotate. The stirring frame 47, in conjunction with the stirring plate 49 within it, breaks the laminar flow of the liquid, allowing the acid and alkali reactants to diffuse rapidly and distribute evenly in the solution. The extension and retraction of the cylinder 41 changes the vertical position of the fifth bearing seat 45, causing the fourth rotating shaft 43 to rise and fall, which in turn raises and lowers the stirring frame 47, adjusting its height. This adjustable height of the stirring frame 47 optimizes the mixing effect. When the stirring frame 47 is lowered, the stirring action is concentrated in the lower layer of the liquid, resulting in more vigorous mixing. Raising the height of the stirring frame 47 allows the stirring action to cover a wider range of liquid depths, promoting thorough mixing and preventing stratification. When the stirring frame 47 rises, it drives the second guide sleeve upwards, causing the connecting rod 48 to move upwards, which in turn causes the stirring plate 49 to swing upwards, resulting in an upward-tilted state. When the stirring frame 47 descends, it drives the second guide sleeve downward, causing the connecting rod 48 to move downward, which in turn causes the stirring plate 49 to swing downward, resulting in the stirring plate 49 being in a downward tilted state. When the stirring frame 47 is in its initial position, the stirring plate 49 is horizontal. When the stirring plate 49 is tilted upward, it generates an upward lifting force on the mixture, which effectively turns the mixture at the bottom upward, promoting the exchange of liquid between the bottom and the top. When the stirring plate 49 is horizontal, it mainly stirs the mixture in the horizontal direction, which effectively mixes the mixture evenly at the same height. When the stirring plate 49 is tilted downward, it generates a downward force on the mixture, causing the upper part of the mixture to flow downward.

[0049] The hollow shaft 44 has grooves 410 on its two opposite outer side walls, and the second guide sleeve 46 has sliders 411 on its two opposite inner side walls. The sliders 411 are located within the grooves 410 and slide in cooperation with them. The relative arrangement of the grooves 410 and sliders 411 ensures that the second guide sleeve 46 moves axially along the hollow shaft 44, but not circumferentially, thus guaranteeing the height adjustment of the stirring frame 47 and the up-and-down swing adjustment of the stirring plate 49.

[0050] The transmission assembly 5 includes a driving wheel 51, a driven wheel 52, and a transmission belt 53. The driving wheel 51 is fixed to the first rotating shaft 34, and the driven wheel 52 is fixed to the hollow shaft 44. The driving wheel 51 and the driven wheel 52 are connected by the transmission belt 53. When the first stirring shaft rotates, it drives the driving wheel 51 to rotate, which in turn drives the driven wheel 52 to rotate via the transmission belt 53, causing the hollow shaft 44 to rotate. In this way, the second stirring assembly 4 is also driven by the motor 33, eliminating the need for an additional drive source and saving manufacturing costs.

[0051] 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. A wastewater resource recovery system, characterized in that: It includes reaction equipment, reverse osmosis equipment, and bipolar membrane electrodialysis equipment arranged sequentially along the processing direction; The upper clear liquid outlet of the reaction equipment is connected to the reverse osmosis equipment via a pipeline; The concentrate outlet of the reverse osmosis equipment is connected to the bipolar membrane electrodialysis equipment via a pipeline. The reaction equipment includes a tank, a partition, a first stirring assembly, a second stirring assembly, a transmission assembly, a coagulant dosing device, and an alkali dosing device; The box body has an internal partition that divides the internal space of the box body into a coagulation zone and a neutralization zone. A water passage is provided between the partition and the top wall of the box body. The top of the box is fixed with a first stirring component and a second stirring component, and the first stirring component and the second stirring component are connected by a transmission component. The stirring end of the first stirring component extends into the coagulation zone, and the stirring end of the second stirring component extends into the neutralization zone; The coagulant dosing device is connected to the coagulation zone, and the alkali dosing device is connected to the neutralization zone; The alkaline solution outlet of the bipolar membrane electrodialysis equipment is connected to the alkaline solution dosing device via a pipeline. The first stirring assembly includes a first mounting frame, a second mounting frame, a motor, a first rotating shaft, a first bearing housing, an annular seat, a first tooth, a first connecting frame, a second bearing housing, a second rotating shaft, a first gear, a lifting component, a first stirring blade, and a second stirring blade; The top wall of the housing has an opening, the first mounting bracket is fixed to the top of the housing, and the second mounting bracket and the first bearing seat are both fixed to the top of the first mounting bracket; The annular seat is fixed to the inner top wall of the first mounting frame; The motor is fixed to the second mounting bracket, and a first rotating shaft is fixed to the bottom end of the motor. The bottom end of the first rotating shaft passes through the first bearing seat, the top wall of the first mounting bracket, the annular seat, and the opening, and extends to the inner bottom of the coagulation zone where a first stirring blade is fixed. The upper left and right sides of the first rotating shaft are symmetrically fixed with first connecting brackets, the top of the first connecting brackets is fixed with a second bearing seat, the second rotating shaft is inserted into the second bearing seat, and the first gear is fixed to the second rotating shaft; The bottom wall of the annular seat is provided with a plurality of first teeth around its circumference, and the first teeth mesh with the first gear. The lifting component is fixed to the first rotating shaft and connected to the outer end of the second rotating shaft. The lifting end of the lifting component is fixed with a second stirring blade. The second stirring blade is located above the first stirring blade; The lifting component includes a turntable, a swing arm, a lifting rod, a second connecting frame, and a first guide sleeve; A turntable is fixed to the outer end of the second rotating shaft, and a swing rod is hinged to the edge of the outer side wall of the turntable. A lifting rod is hinged to the bottom end of the swing rod. The first rotating shaft is symmetrically fixed with second connecting frames on its upper left and right sides, and the second connecting frames are located between the first connecting frame and the top wall of the housing. The second connecting frame is fixed with a first guide sleeve, and the lifting rod passes through the first guide sleeve and extends into the coagulation zone where a second stirring blade is fixed. The first stirring assembly further includes a sealed box, a third bearing housing, a third rotating shaft, a second gear, a second tooth, and a third stirring blade; A sealing box is fixed in the middle of the first rotating shaft; The top wall of the sealed box is symmetrically fixed with third bearing seats on the left and right sides. The inner end of the third rotating shaft is inserted into the third bearing seat. The outer end of the third rotating shaft passes through the side wall of the sealed box and extends to the outside of the sealed box where a third stirring blade is fixed. The second gear is fixed to the third rotating shaft, and the lifting rod has a plurality of second teeth that are equidistantly spaced along its length direction, and the second teeth mesh with the second gear; The first rotating shaft and the sealing box, the lifting rod and the sealing box, and the third rotating shaft and the sealing box are all sealed.

2. The wastewater resource utilization treatment system according to claim 1, characterized in that: The product water outlet of the reverse osmosis equipment is connected to the recovery chamber of the bipolar membrane electrodialysis equipment via a pipeline. The brine outlet of the bipolar membrane electrodialysis equipment is connected to the reverse osmosis equipment via a pipeline.

3. The wastewater resource utilization treatment system according to claim 1, characterized in that: The length direction of the second stirring blade is perpendicular to the length direction of the first stirring blade.

4. The wastewater resource utilization treatment system according to claim 1, characterized in that: The second stirring assembly includes a cylinder, a fourth bearing housing, a fourth rotating shaft, a hollow shaft, a fifth bearing housing, a second guide sleeve, a stirring frame, a connecting rod, and a stirring plate; Both the cylinder and the fourth bearing seat are fixed to the top of the housing; The top of the cylinder is fixed with a fifth bearing seat; The bottom end of the hollow shaft passes through the fourth bearing seat and the top wall of the housing, and extends into the neutralization zone where a stirring plate is hinged. The second guide sleeve is fitted onto the hollow shaft, and a connecting rod is hinged to the side wall of the second guide sleeve. The bottom end of the connecting rod is hinged to the outer end of the stirring plate. The top wall of the stirring frame is fixed to the outer wall of the second guide sleeve; The top end of the fourth rotating shaft is inserted into the fifth bearing seat, and the bottom end of the fourth rotating shaft passes through the hollow shaft and extends out to be fixedly connected to the bottom wall of the stirring frame. The stirring plate is located inside the stirring frame.

5. The wastewater resource recovery system according to claim 4, characterized in that: The hollow shaft has grooves on its two opposite outer side walls, and the second guide sleeve has sliders on its two opposite inner side walls. The sliders are located in the grooves and slide in cooperation with the grooves.

6. The wastewater resource utilization treatment system according to claim 4, characterized in that: The transmission assembly includes a driving wheel, a driven wheel, and a transmission belt; The driving wheel is fixed to the first rotating shaft, and the driven wheel is fixed to the hollow shaft; The driving wheel and the driven wheel are connected by a transmission belt.

7. A method for the resource-based treatment of wastewater, characterized in that, The wastewater is treated using the wastewater resource recovery treatment system according to any one of claims 1-6, comprising the following steps: Acidic wastewater is fed into the coagulation zone, where coagulant is added via a coagulant dosing device. After mixing by the first stirring component, flocculation and sedimentation occur. The supernatant after coagulation treatment enters the neutralization zone through the water passage, where alkali is added via an alkali dosing device. After mixing by the second stirring component, hydroxide precipitate is formed. The hydroxide precipitate is collected, and the supernatant is sent to the reverse osmosis equipment for concentration treatment. The concentrated water is then sent to the bipolar membrane electrodialysis equipment for further treatment, yielding brine, alkali, and acid solutions. The acid solution is reused in other processes, the alkali solution is reused in the alkali dosing device, and the brine solution is reused in the reverse osmosis equipment. The permeate obtained from the concentration treatment is sent to the recovery chamber of the bipolar membrane electrodialysis equipment.

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