Wastewater resourceful treatment system and method

Abstract

The invention discloses a wastewater resourceful treatment system and method, and belongs to the field of wastewater treatment.The wastewater resourceful treatment system comprises reaction equipment, reverse osmosis equipment and bipolar membrane electrodialysis equipment which are sequentially arranged in the treatment direction, and a supernatant liquid outlet of the reaction equipment is communicated with the reverse osmosis equipment through a pipeline; a 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 dosing device and an alkali liquor dosing device, and the first stirring assembly and the second stirring assembly are in transmission connection through the transmission assembly; the stirring end of the first stirring assembly extends into the coagulation area, the stirring end of the second stirring assembly extends into the neutralization area, the coagulant doser is communicated with the coagulation area, the alkali liquor doser is communicated with the neutralization area, and an alkali liquor outlet of the bipolar membrane electrodialysis equipment is communicated with the alkali liquor doser through a pipeline. The method not only achieves zero wastewater discharge, but also recovers acid and alkali.

Description

Technical Field

[0001] The present invention belongs to the field of wastewater treatment, and in particular relates to a wastewater resource treatment system and method. Background Art

[0002] There are various existing methods for wastewater resource treatment, each of which has its specific application scenarios and advantages and disadvantages.

[0003] Among them, for acidic wastewater, the neutralization method is often used. The neutralization method is to add alkaline substances, such as sodium hydroxide, calcium hydroxide, etc., to make the acid and alkali in the wastewater undergo a neutralization reaction, thereby increasing the pH value of the wastewater to meet the discharge standard. This method is simple and easy, but it will produce a large amount of salt waste, which requires further treatment. In addition, in acidic wastewater, there are not only acidic substances, but also suspended matter and colloid substances. If alkali is directly added for neutralization reaction, the suspended matter and colloid substances will affect the neutralization reaction, the reaction effect is not good, and there are impurities, which is not conducive to subsequent treatment. Summary of the invention

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

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] The invention provides a wastewater resource treatment system, comprising a reaction device, a reverse osmosis device, and a bipolar membrane electrodialysis device which are sequentially arranged along a treatment direction, wherein an upper clear liquid outlet of the reaction device is connected with the reverse osmosis device through a pipeline, and a concentrated water outlet of the reverse osmosis device is connected with the bipolar membrane electrodialysis device through a pipeline, the reaction device comprises a box body, a partition, a first stirring component, a second stirring component, a transmission component, a coagulant doser, and an alkali solution doser, the box body is provided with a partition inside, the partition 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, a first stirring component and a second stirring component are fixed on the top of the box body, the first stirring component and the second stirring component are connected through a transmission component, a stirring end of the first stirring component extends into the coagulation zone, a stirring end of the second stirring component extends into the neutralization zone, the coagulant doser is connected with the coagulation zone, the alkali solution doser is connected with the neutralization zone, and the alkali solution outlet of the bipolar membrane electrodialysis device is connected with the alkali solution doser through a pipeline.

[0007] Preferably, the water outlet of the reverse osmosis device is connected to the recovery chamber of the bipolar membrane electrodialysis device through a pipeline, and the salt solution outlet of the bipolar membrane electrodialysis device is connected to the reverse osmosis device through 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 tooth, a first connecting frame, a second bearing seat, a second rotating shaft, a first gear, a lifting member, a first stirring blade, and a second stirring blade. The top wall of the box body has an opening. The first mounting frame is fixed to the top of the box body. 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 the first rotating shaft. The bottom end of the first rotating shaft passes through the first bearing seat, the second A first stirring blade is fixed to the top wall, annular seat, and opening of a mounting frame, and extends to the inner bottom of the coagulation zone, a first connecting frame is symmetrically fixed to 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, the first gear is fixed to the second rotating shaft, a plurality of first teeth are arranged around the bottom wall of the annular seat along its circumference, the first teeth are meshed with the first gear, a lifting member 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 member, and 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 member includes a turntable, a rocker 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 edge of the outer wall of the turntable is hinged with a rocker arm, the bottom end of the rocker arm is hinged with the lifting rod, the second connecting frames are symmetrically fixed on 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 body, the second connecting frame is fixed with the first guide sleeve, the lifting rod passes through the first guide sleeve, and extends to the coagulation area where the second stirring blade is fixed.

[0011] Preferably, the first stirring component also includes a sealing box, a third bearing seat, a third rotating shaft, a second gear, second teeth, and a third stirring blade. A sealing box is fixed to the middle part of the first rotating shaft, and third bearing seats are 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, and 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, and the lifting rod has a plurality of second teeth equidistantly spaced along its length direction, and the second teeth are meshed 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.

[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 box body, and the fifth bearing seat is fixed to the top of the cylinder. The bottom end of the hollow shaft passes through the fourth bearing seat and the top wall of the box body, and extends to the neutralization area and is hinged with a stirring plate. The second guide sleeve is sleeved on the hollow shaft, and the side wall of the second guide sleeve is hinged with a connecting rod. The bottom end of the connecting rod is hinged to the outer end of the stirring plate, and 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 the hollow shaft is extended to be fixedly connected to the bottom wall of the stirring frame, and the stirring plate is located in the stirring frame.

[0013] Preferably, two opposite outer side walls of the hollow shaft have sliding grooves, and two opposite side walls inside the second guide sleeve have sliding blocks, which are located in the sliding grooves and slidably cooperate with the sliding grooves.

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

[0015] The present invention also provides a method for treating wastewater as a resource, which adopts the above-mentioned wastewater resource treatment system for treatment, and comprises the following steps: sending acidic wastewater into a coagulation zone, adding coagulant into the coagulation zone through a coagulant doser, stirring and mixing through a first stirring component to form flocculation precipitation, the upper clear liquid after coagulation treatment enters the neutralization zone through a water passage, adding alkali solution into the neutralization zone through an alkali solution doser, stirring and mixing through a second stirring component to form hydroxide precipitation, collecting the hydroxide precipitation, sending the upper clear liquid into a reverse osmosis device for concentration treatment, sending the concentrated water obtained by the concentration treatment into a bipolar membrane electrodialysis device for treatment to obtain salt solution, alkali solution, and acid solution, the acid solution is reused to other sections, the alkali solution is reused to the alkali solution doser, the salt solution is reused to the reverse osmosis device, and the produced water obtained by the concentration treatment is sent to the recovery chamber of the bipolar membrane electrodialysis device.

[0016] The beneficial effects of the present invention are:

[0017] 1. There is no wastewater discharge during the entire treatment process, which not only achieves zero wastewater discharge, but also can realize the resource treatment of acidic wastewater, not only recovering aluminum hydroxide, but also recovering acid. The recycled sodium hydroxide solution reduces the amount of sodium hydroxide solution used in the neutralization reaction, reduces the treatment cost, and combines the settings of the first stirring component and the second stirring component to greatly improve the treatment efficiency.

[0018] 2. The mixed liquid in the coagulation zone is stirred and mixed by the first stirring blade and the second stirring blade at different heights to enhance the mixing effect.

[0019] 3. While the second stirring blade is rotating, the lifting member drives the second stirring blade to move up and down repeatedly to change its stirring position, which greatly enhances the mixing uniformity of the mixed liquid in the vertical direction and helps to form a more compact and 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 mixed liquid, change the local flow field, and ensure that the mixed liquid can be fully mixed at all positions.

[0021] 5. Since the third stirring blade rotates and revolves simultaneously, it can stir the mixed liquid under two different levels of circular motion; the rotation can produce a stronger local stirring effect within a smaller circular range, so that the mixed liquid close to the stirring blade is fully stirred; while the revolution expands the stirring effect to a larger range, ensuring that the mixed liquid can be stirred in a wider area, thereby improving the mixing uniformity of the mixed liquid; this composite motion mode will create a complex flow field in the mixed liquid, and this complex flow field can effectively mix the coagulant and acidic wastewater better.

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

[0023] 7. The adjustable height of the stirring frame optimizes the mixing effect; when the height of the stirring frame is lowered, the stirring effect is relatively concentrated in the lower layer of the liquid, making the mixing of the lower layer of the liquid more intense; raising the height of the stirring frame can make the stirring effect cover a wider range of liquid depths, promote the upper and lower mixing of the entire liquid, and avoid 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 mixed liquid. This lifting force can effectively flip the mixed liquid at the bottom upward, and promote the exchange of the bottom liquid and the upper liquid; when the stirring plate is in a horizontal state, it mainly stirs the mixed liquid in the horizontal direction. This stirring method can effectively mix the mixed liquid evenly at the same height level; when the stirring plate is tilted downward, it will generate a downward force on the mixed liquid, prompting the upper mixed liquid to flow downward. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0027] Figure 3 It is a structural schematic diagram of the present invention.

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

[0029] Figure 5 It is a schematic diagram of the structure of the annular seat and the first tooth viewed from above of the present invention.

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

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

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

[0033] The markings in the accompanying drawings are: 100-reaction equipment, 200-reverse osmosis equipment, 300-bipolar membrane electrodialysis equipment, 1-box, 2-partition, 3-first stirring assembly, 4-second stirring assembly, 5-transmission assembly, 6-coagulant doser, 7-alkali solution doser, 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 tooth, 38-lifting member, 39-first connecting frame, 310-second bearing seat, 311-second rotating shaft, 312-first gear, 313- The first stirring blade, 314-the second stirring blade, 381-the turntable, 382-the rocker arm, 383-the lifting rod, 384-the second connecting frame, 385-the first guide sleeve, 315-the sealing box, 316-the third bearing seat, 317-the third rotating shaft, 318-the second gear, 319-the second tooth, 320-the third stirring blade, 41-the cylinder, 42-the fourth bearing seat, 43-the fourth rotating shaft, 44-the hollow shaft, 45-the fifth bearing seat, 46-the second guide sleeve, 47-the stirring frame, 48-the connecting rod, 49-the stirring plate, 410-the slide groove, 411-the slider, 51-the driving wheel, 52-the driven wheel, 53-the transmission belt. DETAILED DESCRIPTION

[0034] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0035] Contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field. In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0036] like Figures 1 to 8 As shown, a wastewater resource treatment system provided in this embodiment includes a reaction device 100, a reverse osmosis device 200, and a bipolar membrane electrodialysis device 300 arranged in sequence along the treatment direction, the upper clear liquid outlet of the reaction device 100 is connected to the reverse osmosis device 200 through a pipeline, and the concentrated water outlet of the reverse osmosis device 200 is connected to the bipolar membrane electrodialysis device 300 through a pipeline. The reaction device 100 includes a box 1, a partition 2, a first stirring component 3, a second stirring component 4, a transmission component 5, a coagulant doser 6, and an alkali solution doser 7. The interior of the box 1 has a partition 2, The partition 2 divides the internal space of the box 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 box 1. A first stirring assembly 3 and a second stirring assembly 4 are fixed on the top of the box 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. The coagulant doser 6 is connected to the coagulation zone 8, the alkali solution doser 7 is connected to the neutralization zone 9, and the alkali solution outlet of the bipolar membrane electrodialysis device 300 is connected to the alkali solution doser 7 through a pipeline. The water outlet of the reverse osmosis device 200 is connected to the recovery chamber of the bipolar membrane electrodialysis device 300 through a pipeline, and the salt solution outlet of the bipolar membrane electrodialysis device 300 is connected to the reverse osmosis device 200 through a pipeline.

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

[0038] The acidic wastewater is sent to the coagulation zone 8, and the coagulant is added to the coagulation zone 8 through the coagulant dosing device 6. The wastewater is stirred and mixed by the first stirring component 3 to form a flocculation precipitate. The supernatant after the coagulation treatment enters the neutralization zone 9 through the water passage 10, and the alkali solution is added to the neutralization zone 9 through the alkali solution dosing device 7. The wastewater is stirred and mixed by the second stirring component 4 to form a hydroxide precipitate. The hydroxide precipitate is collected, and the supernatant is sent to the reverse osmosis device 200 for concentration treatment. The concentrated water obtained by the concentration treatment is sent to the bipolar membrane electrodialysis device 300 for treatment to obtain saline solution, alkali solution, and acid solution. The acid solution is reused to other sections, the alkali solution is reused to the alkali solution dosing device 7, the saline solution is reused to the reverse osmosis device 200, and the produced water obtained by the concentration treatment is sent to the recovery chamber of the bipolar membrane electrodialysis device 300.

[0039] The acidic wastewater of this embodiment is acidic wastewater containing hydrochloric acid and aluminum chloride. By adding a coagulant, the suspended matter, colloidal substances, etc. in the acidic wastewater are first condensed into flocs and precipitated, some impurities and pollutants in the acidic wastewater are removed, the interference with the aluminum hydroxide precipitation is reduced, and the precipitation effect is improved. Then, by adding a sodium hydroxide solution, it reacts with the hydrochloric acid and aluminum chloride in the acidic wastewater to form a sodium chloride solution and an aluminum hydroxide precipitate, so that the purity of the obtained aluminum hydroxide precipitate and sodium chloride solution is higher. Combined with the arrangement of the first stirring component 3 and the second stirring component 4, the treatment efficiency is greatly improved, the sodium chloride solution is sent to the reverse osmosis device 200 for concentration treatment, and the concentrated concentrated water is treated by the bipolar membrane electrodialysis device 300 to obtain three liquids, namely sodium hydroxide solution, hydrogen chloride solution, and sodium chloride solution (dilute), and the sodium hydroxide solution is reused to the alkali solution doser 7, the sodium chloride solution is reused to the reverse osmosis device 200, the hydrogen chloride solution is reused to other sections, and the produced water of the reverse osmosis device 200 is sent to the recovery room of the bipolar membrane electrodialysis device 300. There is no wastewater discharge in the whole treatment process, which not only achieves zero wastewater discharge, but also can realize the resource treatment of acidic wastewater, not only recovers aluminum hydroxide, but also recovers acid, and the reused sodium hydroxide solution reduces the amount of sodium hydroxide solution used in the neutralization reaction, reducing the treatment cost. By integrating the coagulation treatment and the neutralization reaction treatment into a box 1, the space occupation 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 tooth 37, a first connecting frame 39, a second bearing seat 310, a second rotating shaft 311, a first gear 312, a lifting member 38, a first stirring blade 313, and a second stirring blade 314. The top wall of the box body 1 has an opening. The first mounting frame 31 is fixed to the top of the box body 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. The bottom end of the first rotating shaft 34 passes through the first bearing seat 35. The first mounting frame 31 has a top wall, an annular seat 36, and an opening, and a first stirring blade 313 is fixed to the inner bottom extending to the coagulation zone 8. The first connecting frame 39 is symmetrically fixed to the left and right sides of the upper part of the first rotating shaft 34. The top of the first connecting frame 39 is fixed to the 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 circumferentially provided with a plurality of first teeth 37, and the first teeth 37 are meshed 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, and the second stirring blade 314 is located above the first stirring blade 313.

[0041] After adding the coagulant, the motor 33 is turned on to drive the first rotating shaft 34 to rotate, so that the first stirring blade 313 rotates, and the coagulant and the acidic wastewater are stirred and mixed, so that the coagulant is evenly dispersed in the acidic wastewater, the coagulation process is accelerated, and the treatment efficiency is improved. While the first rotating shaft 34 rotates, the lifting member 38 is driven to rotate together, so that the second stirring blade 314 rotates together to stir and mix. The mixed liquid in the coagulation zone 8 is stirred and mixed at different heights by the first stirring blade 313 and the second stirring blade 314 to enhance the mixing effect. And while the second stirring blade 314 rotates, the lifting member 38 drives the second stirring blade 314 to repeatedly move up and down to change its stirring position, greatly enhancing the mixing uniformity of the mixed liquid in the vertical direction. In the coagulation process, the formation of flocs requires a suitable particle collision and aggregation environment. The up and down movement of the second stirring blade 314 can change the local water flow speed and direction, so that the floc particles shuttle in different water flow environments. On the one hand, when it moves upward, it can bring the flocs that have been initially formed at the bottom to the top, where they meet with the smaller particles or flocs above, increasing the chances of collision and aggregation between them. On the other hand, when it moves downward, it can bring the flocs above to the bottom, preventing the flocs from excessively gathering at the top and forming a loose structure, which helps to form a more compact and stable floc.

[0042] The length direction of the second stirring blade 314 is perpendicular to the length direction of the first stirring blade 313. A three-dimensional stirring effect is achieved on the mixed liquid, the local flow field is changed, and it is ensured that the mixed liquid can be fully mixed at all positions.

[0043] Among them, the lifting member 38 includes a turntable 381, a rocker arm 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 edge of the outer wall of the turntable 381 is hinged with the rocker arm 382, ​​the bottom end of the rocker arm 382 is hinged with the lifting rod 383, the second connecting frame 384 is symmetrically fixed on 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 body 1, the second connecting frame 384 is fixed with the first guide sleeve 385, the lifting rod 383 passes through the first guide sleeve 385, and extends to the coagulation zone 8 where the second stirring blade 314 is fixed.

[0044] The first rotating shaft 34 rotates while driving the first connecting frame 39 to rotate, causing the second bearing seat 310 to rotate. Through the cooperation of the first gear 312 and the first tooth 37, the second rotating shaft 311 rotates, driving the turntable 381 to rotate, causing the swing rod to swing up and down, driving the lifting rod 383 to reciprocate up and down, thereby achieving the up and down reciprocating movement of the second stirring blade 314 while rotating. The first guide sleeve 385 is provided to ensure the smooth lifting of the lifting rod 383. In this way, no additional driving source is required to drive the lifting, and only one motor 33 is required, which not only realizes the stirring operation of the first stirring blade 313, but also realizes the lifting operation of the second stirring blade 314 while stirring.

[0045] Among them, the first stirring component 3 also includes a sealing box 315, a third bearing seat 316, a third rotating shaft 317, a second gear 318, a second tooth 319, and a third stirring blade 320. The sealing box 315 is fixed to the middle part of the first rotating shaft 34, and 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, and 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, and the lifting rod 383 has a plurality of second teeth 319 arranged at equal intervals along its length direction. The second teeth 319 are meshed 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] When the lifting rod 383 is lifted and lowered, the second tooth 319 is driven to move up and down, and then the second gear 318 is driven to rotate forward and reversely, so that the third rotating shaft 317 rotates forward and reversely, and the third stirring blade 320 is driven to rotate forward and reversely to perform stirring operation. The third stirring blade 320 rotates around the third rotating shaft 317, and the third stirring blade 320 revolves around the first rotating shaft 34. Since the third stirring blade 320 rotates and revolves at the same time, it can stir the mixed liquid under two different levels of circular motion. Rotation can produce a strong local stirring effect within a smaller circumference, so that the mixed liquid close to the stirring blade is fully stirred. The revolution expands this stirring effect to a larger range, ensuring that the mixed liquid can be stirred in a wider area, thereby improving the mixing uniformity of the mixed liquid. This composite motion mode will create a complex flow field in the mixed liquid, and this complex flow field can effectively mix the coagulant and acidic wastewater better. Similarly, the rotation of the third stirring blade 320 does not require an additional driving source, and only requires a motor 33 as a driving source to realize the stirring operation of the first stirring blade 313, the stirring and lifting operation of the second stirring blade 314, and the rotation + revolution stirring operation of the third stirring blade 320.

[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 fixed to the top of the box body 1. The fifth bearing seat 45 is fixed to the top of the cylinder 41. The bottom end of the hollow shaft 44 passes through the fourth bearing seat 42 and the top wall of the box body 1, and extends to the neutralization zone 9 and is hinged with a stirring plate. 49, the second guide sleeve 46 is sleeved on the hollow shaft 44, the side wall of the second guide sleeve 46 is hinged with a connecting rod 48, 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 the hollow shaft 44 to be fixedly connected with the bottom wall of the stirring frame 47, and the stirring plate 49 is located in the stirring frame 47.

[0048] The first stirring shaft rotates, and the hollow shaft 44 is driven to rotate through the transmission assembly 5, so that the stirring plate 49 and the stirring frame 47 rotate. The stirring frame 47 cooperates with the setting of the stirring plate 49 therein, which can break the laminar state of the liquid, so that the two reactants of acid and alkali are rapidly diffused and evenly distributed in the solution. The cylinder 41 is extended and retracted to change the upper and lower positions of the fifth bearing seat 45, so that the fourth rotating shaft 43 is lifted and lowered, and the stirring frame 47 is driven to lift and lower, and its height is adjusted. The adjustable height position of the stirring frame 47 optimizes the mixing effect. When the height of the stirring frame 47 is reduced, the stirring action is relatively concentrated in the lower layer of the liquid, so that the mixing of the lower layer of liquid is more intense. Raising the height of the stirring frame 47 can make the stirring action cover a wider range of liquid depths, promote the upper and lower mixing of the entire liquid, and avoid stratification. When the stirring frame 47 rises, it drives the second guide sleeve to move upward, so that the connecting rod 48 moves upward, drives the stirring plate 49 to swing upward, and makes the stirring plate 49 tilt upward. When the stirring frame 47 descends, it drives the second guide sleeve to move downward, so that the connecting rod 48 moves downward, and drives the stirring plate 49 to swing downward, so that the stirring plate 49 is in a downward tilted state. When the stirring frame 47 is in the initial position, the stirring plate 49 is in a horizontal state. When the stirring plate 49 is in an upward tilted state, an upward lifting force will be generated on the mixed liquid, and this lifting force can effectively flip the mixed liquid at the bottom upward, and promote the exchange of the bottom liquid and the upper liquid. When the stirring plate 49 is in a horizontal state, the mixed liquid is mainly stirred in the horizontal direction. This stirring method can effectively mix the mixed liquid evenly at the same height level. When the stirring plate 49 is in a downward tilted state, a downward force will be generated on the mixed liquid, prompting the upper mixed liquid to flow downward.

[0049] The two opposite outer side walls of the hollow shaft 44 are provided with a slide groove 410, and the two opposite side walls inside the second guide sleeve 46 are provided with a slider 411, which is located in the slide groove 410 and slides with the slide groove 410. By setting the slide groove 410 and the slider 411 arranged relatively, it is ensured that the second guide sleeve 46 moves along the axial direction of the hollow shaft 44, but does not move along the circumferential direction of the hollow shaft 44, so as to ensure the height position 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 to each other through the transmission belt 53. The first stirring shaft rotates, driving the driving wheel 51 to rotate, and the driven wheel 52 is driven to rotate through the transmission belt 53, so that the hollow shaft 44 rotates. In this way, the second stirring assembly 4 is also driven by the motor 33, without the need for an extra driving source, saving manufacturing costs.

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it should be understood by those skilled in the art that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wastewater resource treatment system, characterized in that: It includes a reaction device, a reverse osmosis device, and a bipolar membrane electrodialysis device which are sequentially arranged along the treatment direction; The supernatant liquid outlet of the reaction device is connected to the reverse osmosis device through a pipeline; The concentrated water outlet of the reverse osmosis device is connected to the bipolar membrane electrodialysis device through a pipeline; The reaction equipment comprises a box body, a partition, a first stirring component, a second stirring component, a transmission component, a coagulant doser, and an alkali solution doser; The box body has a partition inside, the partition divides the internal space of the box body into a coagulation zone and a neutralization zone, and a water passage is provided between the partition and the top wall of the box body; A first stirring assembly and a second stirring assembly are fixed on the top of the box, and the first stirring assembly and the second stirring assembly are connected by a transmission assembly; 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 doser is in communication with the coagulation zone, and the alkali solution doser is in communication with the neutralization zone; The alkali solution outlet of the bipolar membrane electrodialysis device is connected to the alkali solution doser through a pipeline.

2. The wastewater resource treatment system according to claim 1, characterized in that: The water output outlet of the reverse osmosis device is connected to the recovery chamber of the bipolar membrane electrodialysis device through a pipeline; The salt solution outlet of the bipolar membrane electrodialysis device is connected to the reverse osmosis device through a pipeline.

3. The wastewater resource treatment system according to claim 1 is characterized in that: 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 tooth, a first connecting frame, a second bearing seat, a second rotating shaft, a first gear, a lifting member, a first stirring blade, and a second stirring blade; The top wall of the box body has an opening, the first mounting frame is fixed to the top of the box body, and 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, 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 frame, the annular seat, and the opening, and extends to the inner bottom of the coagulation zone where a first stirring blade is fixed; 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 on the top of the first connecting frame, 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 along its circumference, and the first teeth are meshed with the first gear; The lifting member is fixed to the first rotating shaft and connected to the outer end of the second rotating shaft, and a second stirring blade is fixed to the lifting end of the lifting member; The second stirring blade is located above the first stirring blade.

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

5. The wastewater resource treatment system according to claim 3 is characterized in that: The lifting member includes a turntable, a swing rod, a lifting rod, a second connecting frame, and a first guide sleeve; A rotating disk is fixed to the outer end of the second rotating shaft, a swing rod is hingedly connected to the edge of the outer side wall of the rotating disk, and a lifting rod is hingedly connected to the bottom end of the swing rod; A second connecting frame is symmetrically fixed to the left and right sides of the upper portion of the first rotating shaft, and the second connecting frame is located between the first connecting frame and the top wall of the box body; The second connecting frame is fixed with a first guide sleeve, the lifting rod passes through the first guide sleeve and extends to the coagulation zone where a second stirring blade is fixed.

6. The wastewater resource treatment system according to claim 5 is characterized in that: 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; A sealing box is fixed in the middle of the first rotating shaft; A third bearing seat is symmetrically fixed on the left and right sides of the inner top wall of the sealed box, the inner end of the third rotating shaft is inserted into the third bearing seat, and 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 to be fixed with a third stirring blade; The second gear is fixed to the third rotating shaft, the lifting rod has a plurality of second teeth arranged at equal intervals along the length direction thereof, and the second teeth are meshed 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.

7. The wastewater resource treatment system according to claim 3 is characterized in that: 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 box body; A fifth bearing seat is fixed to the top end of the cylinder; The bottom end of the hollow shaft passes through the fourth bearing seat and the top wall of the box body, and extends to the neutralization zone and is hingedly connected with a stirring plate; The second guide sleeve is sleeved on the hollow shaft, a connecting rod is hingedly connected to the side wall of the second guide sleeve, and the bottom end of the connecting rod is hingedly connected to the outer end of the stirring plate; The top wall of the stirring frame is fixed to the outer side 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 the hollow shaft is extended to be fixedly connected to the bottom wall of the stirring frame; The stirring plate is located in the stirring frame.

8. The wastewater resource treatment system according to claim 7 is characterized in that: The two opposite outer side walls of the hollow shaft are provided with sliding grooves, and the two opposite side walls inside the second guide sleeve are provided with sliding blocks, and the sliding blocks are located in the sliding grooves and slidably matched with the sliding grooves.

9. The wastewater resource treatment system according to claim 7, 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 via a transmission belt.

10. A method for recycling wastewater, characterized in that: The wastewater resource treatment system according to any one of claims 1 to 9 is used for treatment, comprising the following steps: The acidic wastewater is sent to the coagulation zone, and coagulant is added to the coagulation zone through the coagulant doser. After stirring and mixing by the first stirring component, flocculation precipitation is formed. The upper clear liquid after coagulation treatment enters the neutralization zone through the water passage, and alkali solution is added to the neutralization zone through the alkali solution doser. After stirring and mixing by the second stirring component, hydroxide precipitation is formed. The hydroxide precipitation is collected, and the upper clear liquid is sent to the reverse osmosis equipment for concentration treatment. The concentrated water obtained by the concentration treatment is sent to the bipolar membrane electrodialysis equipment for treatment to obtain salt solution, alkali solution, and acid solution. The acid solution is reused to other sections, the alkali solution is reused to the alkali solution doser, and the salt solution is reused to the reverse osmosis equipment. The produced water obtained by the concentration treatment is sent to the recovery room of the bipolar membrane electrodialysis equipment.

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