A wastewater treatment system integrating seed agitation and hard water contact

Abstract

This invention relates to the field of wastewater treatment technology, specifically to a wastewater treatment system integrating seed crystal stirring and hard water contact. The system includes a tank and a seed crystal distribution hood installed inside the tank, as well as a dispersion mechanism. The dispersion mechanism includes an upper rotating shaft rotatably mounted on the seed crystal distribution hood. Side rods are fixedly connected to both sides of the upper rotating shaft. Several dispersion blades are equidistantly mounted on the front and rear sides of each side rod. A moving component is mounted on each side rod, driving the dispersion blades to reciprocate along the length of the side rod as the upper rotating shaft rotates. This invention uses the upper rotating shaft to drive the side rods to rotate, causing the side rods to stir the seed crystals and promote their diffusion in the water. Simultaneously, the moving component drives the dispersion blades to reciprocate along the length of the side rods, causing the dispersion blades to push the seed crystals in and out of the seed crystal distribution hood in a circular motion, further promoting seed crystal dispersion and preventing seed crystal aggregation.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a wastewater treatment system that integrates seed crystal stirring with contact with hard water. Background Technology

[0002] In industrial production processes, hard wastewater is often generated. For example, industries such as chemical, electroplating, and papermaking use calcium and magnesium salts as additives, resulting in excessive levels of calcium and magnesium ions in the wastewater. Directly recycling this hard wastewater would cause the calcium and magnesium ions in the water to combine with carbonate and sulfate ions to form insoluble scaling substances such as calcium carbonate and calcium sulfate, which could clog pipes, boilers, and other structures, affecting the service life of equipment. Therefore, it is necessary to soften the hard wastewater.

[0003] Crystallization granulation fluidized bed softening technology is a novel softening method. This method mainly involves precisely adding NaOH or simultaneously adding NaOH and Na2CO3 into the equipment based on the hardness and alkalinity composition of the water. This causes calcium carbonate crystals to form in the water, and the generated calcium carbonate crystals directly adhere to the surface of the seed crystals and grow, ultimately forming recyclable calcium carbonate particles with a diameter of 1-3 mm. The discharged particles contain more than 90% calcium carbonate and can be reused in the desulfurization system. No wastewater is discharged, thus reducing the hardness of the water.

[0004] Existing fluidized bed systems typically deliver seed crystals into the tank via pipes. However, the seed crystals tend to accumulate at the outlet of the delivery pipe, leading to agglomeration. Agglomerated seed crystals reduce the contact area with hard water, affecting the wastewater treatment effect. Furthermore, agglomerated seed crystals will settle downwards under gravity, shortening the contact time between the seed crystals and hard water, which is detrimental to the softening treatment of hard water. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a wastewater treatment system integrating seed crystal stirring and hard water contact, comprising a tank and a seed crystal distribution cover installed inside the tank, and a dispersion mechanism. The dispersion mechanism includes an upper rotating shaft rotatably mounted on the seed crystal distribution cover, with side rods fixedly connected to both the left and right sides of the upper rotating shaft. Several dispersion blades are equidistantly installed on both the front and rear sides of the side rods. The side rods are equipped with a moving component that drives the dispersion blades to reciprocate along the length direction of the side rod as the upper rotating shaft rotates, and a rotating component that drives the dispersion blades to flip.

[0006] The stirring mechanism includes a lower rotating shaft coaxially fixedly connected to the bottom of the upper rotating shaft, and a spiral blade is slidably mounted on the lower rotating shaft. A lifting assembly that drives the spiral blade to move up and down as the lower rotating shaft rotates is installed on the inner wall of the tank.

[0007] A drive motor is fixedly mounted on the top of the tank and is used to drive the upper shaft to rotate.

[0008] When the moving component drives the dispersing blades to change their direction of movement, the rotating component drives the dispersing blades to rotate 90 degrees.

[0009] In one possible implementation, the seed distribution cover is funnel-shaped with its larger opening facing downwards. A dosing pipe is fixedly installed on the outer ring wall of the tank. One end of the dosing pipe near the central axis of the tank is fixedly connected to and communicates with the smaller opening of the seed distribution cover. A grid plate is fixedly installed on the larger opening of the seed distribution cover. The bottom end of the upper rotating shaft rotates through to the bottom of the grid plate.

[0010] In one possible implementation, a distributing wheel located inside the seed distribution hood is fixedly mounted on the upper rotating shaft. The distributing wheel is funnel-shaped with its larger end facing downwards. Several circumferentially evenly distributed paddles are fixedly connected to the outer ring wall of the distributing wheel. The vertical section of the distributing wheel is at the same height as the feeding tube.

[0011] In one possible implementation, a mixing blade is fixedly mounted on the upper rotating shaft between the distributing wheel and the side rod, and the mixing blade is distributed in a cross shape with the side rod perpendicularly projected.

[0012] In one possible implementation, the moving assembly includes a sleeve slidably mounted on a side rod along its length, a plurality of the dispersing blades being rotatably connected to the sleeve, a compression spring fixedly connected between the end of the sleeve near the central axis of the tank and the outer ring wall of the upper rotating shaft, and a swashplate rotatably mounted on the end of the side rod away from the central axis of the tank for driving the sleeve to perform piston motion.

[0013] In one possible implementation, a ball-head connecting rod is fixedly connected to one end of the sleeve away from the central axis of the tank. The end of the ball-head connecting rod away from the central axis of the tank is slidably connected to the inclined surface of the swashplate. A bevel gear is fixedly installed at the end of the swashplate away from the central axis of the tank. A bevel gear ring is installed on the inner wall of the seed distribution cover. Both the left and right bevel gears mesh with the bevel gear ring.

[0014] In one possible implementation, the side rod has a groove inside, and the rotating assembly includes a slide block slidably installed inside the groove along its length. A central shaft is rotatably installed on the slide block, and the front and rear ends of the central shaft are respectively fixedly connected to corresponding dispersion blades. Partitions distributed on the left and right sides of the central shaft are fixedly installed inside the slide block. Rotating plates are fixedly connected to the upper and lower sides of the central shaft. Return springs are fixedly connected between the left and right sides of the lower partition and the corresponding partition. A trapezoidal platform corresponding to the slide block is installed on the top wall of the groove. The trapezoidal platform is isosceles trapezoidal with the length of the base side being less than the length of the top side. The upper rotating plate slides in cooperation with the corresponding trapezoidal platform.

[0015] In one possible implementation, the lifting assembly includes a sleeve two that is slidably mounted on a lower rotating shaft. The spiral blade is fixedly mounted on the outer ring wall of the sleeve two by a support rod. A retaining ring located below the sleeve two is fixedly mounted on the lower rotating shaft. A compression spring two, fitted outside the lower rotating shaft, is fixedly connected between the top of the retaining ring and the bottom of the sleeve two. A wavy guide strip located above the spiral blade is fixedly mounted on the inner wall of the tank. Guide rods are symmetrically mounted on the outer ring wall of the sleeve two. The end of the guide rod away from the central axis of the tank slides against the bottom of the guide strip.

[0016] In one possible implementation, a stirring turbine is fixedly installed at the bottom end of the lower rotating shaft, and a baffle plate located between the stirring turbine and the baffle ring is fixedly installed on the inner wall of the tank. The baffle plate is cross-shaped and rotatably connected to the lower rotating shaft.

[0017] The beneficial effects of this invention are as follows: 1. This invention uses an upper rotating shaft to drive a side rod to rotate, causing the side rod to stir the seed crystals and promote their diffusion in the water. Simultaneously, the moving component drives the dispersing blades to reciprocate along the length of the side rod, causing the dispersing blades to push the seed crystals in and out of the seed distribution hood, further promoting seed dispersion and preventing seed crystal aggregation. When the dispersing blades move away from the central axis of the tank, the bottom of the dispersing blades tilts away from the central axis. When the dispersing blades move closer to the central axis of the tank, the bottom of the dispersing blades tilts closer to the central axis. By changing the tilt angle of the dispersing blades during movement, the dispersing blades provide an upward force to the crystals, partially offsetting the gravity acting on the seed crystals, slowing their descent, allowing sufficient time for diffusion, ensuring adequate contact between the seed crystals and hard water, and improving the treatment effect of the seed crystals.

[0018] 2. This invention uses an upper rotating shaft to drive a lower rotating shaft to rotate, which in turn drives a spiral blade to rotate. While the spiral blade rotates, a lifting component moves the spiral blade up and down reciprocally. The spiral blade generates an axial flow, which drives the water to flow upward, thereby slowing down the falling speed of the seed crystals and allowing them sufficient time to react with the hard water. Meanwhile, the stirring turbine generates a radial flow in the water, promoting the rotation and mixing of the water and the seed crystals. Because the flow directions generated by the spiral blade and the stirring turbine are different, turbulence is generated, reducing the occurrence of vortices, preventing seed crystal aggregation, and improving the treatment effect of the seed crystals on wastewater. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] Figure 2 This is a front cross-sectional view of the present invention.

[0021] Figure 3 This is a three-dimensional structural schematic diagram of the seed distribution cover of the present invention.

[0022] Figure 4 This is a three-dimensional structural diagram of the dispersing mechanism of the present invention.

[0023] Figure 5 This is a three-dimensional structural diagram of the moving component of the present invention.

[0024] Figure 6 This is a partial cross-sectional view of the first sleeve of the present invention.

[0025] Figure 7 This is a schematic diagram of the planar structure of the rotating component of the present invention.

[0026] Figure 8 This is a three-dimensional structural diagram of the stirring mechanism of the present invention.

[0027] In the diagram: 1. Tank body; 2. Seed distribution hood; 21. Dosing pipe; 22. Grating plate; 3. Dispersion mechanism; 31. Upper rotating shaft; 32. Distributing wheel; 33. Mixing blades; 34. Side rod; 341. Slide groove; 35. Dispersion blades; 36. Moving assembly; 361. Sleeve 1; 362. Compression spring 1; 363. Swashplate; 364. Ball joint connecting rod; 365. Bevel gear; 366. Bevel gear ring; 37. 371. Rotating assembly; 372. Slide; 373. Central shaft; 374. Partition plate; 375. Rotating plate; 376. Return spring; 3777. Platform; 4. Stirring mechanism; 41. Lower rotating shaft; 42. Spiral blade; 43. Lifting assembly; 431. Sleeve II; 432. Retaining ring; 433. Compression spring II; 434. Guide bar; 435. Guide rod; 44. Stirring turbine; 45. Baffle plate; 5. Drive motor. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Please see Figure 1 - Figure 8 A wastewater treatment system integrating seed crystal stirring and hard water contact includes a tank 1 and a seed crystal distribution cover 2 installed inside the tank 1. It also includes a dispersion mechanism 3, which includes an upper rotating shaft 31 rotatably mounted on the seed crystal distribution cover 2. Side rods 34 are fixedly connected to both the left and right sides of the upper rotating shaft 31. Several dispersion blades 35 are equidistantly installed on both the front and rear sides of the side rods 34. A moving component 36 is installed on the side rods 34 to drive the dispersion blades 35 to reciprocate along the length direction of the side rods 34 as the upper rotating shaft 31 rotates, and a rotating component 37 is installed on the side rods 34 to drive the dispersion blades 35 to rotate.

[0030] The stirring mechanism 4 includes a lower rotating shaft 41 coaxially fixedly connected to the bottom of the upper rotating shaft 31. A spiral blade 42 is slidably mounted on the lower rotating shaft 41. A lifting assembly 43 is installed on the inner wall of the tank body 1, which drives the spiral blade 42 to move up and down as the lower rotating shaft 41 rotates.

[0031] Drive motor 5 is fixedly installed on the top of tank 1 and is used to drive the upper rotating shaft 31 to rotate.

[0032] In practical use, the seed crystals are dispersed downwards in the seed distribution hood 2. The drive motor 5 drives the upper rotating shaft 31 to rotate, which in turn drives the side rod 34 to rotate, causing the side rod 34 to stir the seed crystals and promote their diffusion in the water. Simultaneously with the rotation of the side rod 34, the moving component 36 drives the dispersing blades 35 to reciprocate along the length of the side rod 34. When the dispersing blades 35 move away from the central axis of the tank 1, their bottom ends tilt away from the central axis of the tank 1. When the dispersing blades 35 move closer to the central axis of the tank 1... When in motion, the bottom end of the dispersing blade 35 tilts towards the central axis of the tank 1. By changing the tilt direction of the dispersing blade 35, the dispersing blade 35 provides an upward force to the crystals, which can partially offset the gravity of the crystals, slow down the falling speed of the crystals, and allow the crystals enough time to diffuse. The dispersing blade 35 moves the crystals in and out of the crystal distribution hood 2, further promoting the diffusion of the crystals in the water, so that the crystals can fully contact the water, avoid the crystals from agglomerating, and improve the treatment effect of the crystals on wastewater.

[0033] When the upper rotating shaft 31 rotates, it drives the lower rotating shaft 41 to rotate together. The lower rotating shaft 41 drives the spiral blade 42 to rotate. While the spiral blade 42 rotates, the lifting component 43 drives the spiral blade 42 to move up and down periodically, so that the spiral blade 42 mixes the seed crystals and water. The spiral blade 42 pushes the water to surge upward, slowing down the speed of the seed crystals falling, so that the seed crystals and water have enough time to contact and react, thereby improving the effect of seed crystals in treating wastewater.

[0034] Please see Figure 1 , Figure 2 and Figure 3 The seed distribution cover 2 is funnel-shaped with the larger end facing down. A dosing pipe 21 is fixedly installed on the outer ring wall of the tank body 1. The end of the dosing pipe 21 near the central axis of the tank body 1 is fixedly connected to and communicates with the smaller end of the seed distribution cover 2. A grid plate 22 is fixedly installed on the larger end of the seed distribution cover 2. The bottom end of the upper rotating shaft 31 rotates through to the bottom of the grid plate 22.

[0035] In practical use, the seeds are delivered to the seed distribution hood 2 through the dosing pipe 21, so that the seeds are dispersed downward in the seed distribution hood 2. The seed distribution hood 2 is funnel-shaped, which is conducive to the gradual outward diffusion of the seeds as they fall. When the seeds fall from the bottom of the seed distribution hood 2, the grid plate 22 is used to separate the seeds to prevent them from agglomerating and to ensure that the seeds can fully contact the water.

[0036] Please see Figure 2 and Figure 4 A material distribution wheel 32 located inside the seed distribution cover 2 is fixedly mounted on the upper rotating shaft 31. The material distribution wheel 32 is funnel-shaped with the larger end facing down. Several circumferentially evenly distributed paddles are fixedly connected to the outer ring wall of the material distribution wheel 32. The vertical section of the material distribution wheel 32 is at the same height as the feeding tube 21.

[0037] In practical use, when the dosing pipe 21 delivers the seed crystals to the top of the seed crystal distribution cover 2, the upper rotating shaft 31 drives the distribution wheel 32 to rotate. The paddles on the distribution wheel 32 push the seed crystals to rotate, so that the seed crystals can diffuse outward under the action of centrifugal force, which is conducive to the full contact between the seed crystals and the water.

[0038] Please see Figure 4 A mixing blade 33 is fixedly installed on the upper rotating shaft 31 between the material distribution wheel 32 and the side rod 34. The mixing blade 33 and the side rod 34 are distributed in a cross shape when projected perpendicularly.

[0039] In practical use, the upper rotating shaft 31 drives the mixing blades 33 to rotate, so that the mixing blades 33 stir the seed crystals and further promote the mixing of the seed crystals with the water. Since the mixing blades 33 and the side rods 34 are arranged in a cross shape, they can play a role in turbulence, reduce the possibility of vortices being generated when the mixing blades 33 and the side rods 34 rotate, and prevent the vortices from causing the seed crystals to agglomerate.

[0040] Please see Figure 4 , Figure 5 and Figure 6 The moving component 36 includes a sleeve 361 slidably mounted on the side rod 34 along its length direction. Several dispersing blades 35 are rotatably connected to the sleeve 361. A compression spring 362, which is fitted outside the side rod 34, is fixedly connected between the end of the sleeve 361 near the central axis of the tank body 1 and the outer ring wall of the upper rotating shaft 31. A swashplate 363 for driving the sleeve 361 to make piston movements is rotatably mounted on the end of the side rod 34 away from the central axis of the tank body 1.

[0041] Please see Figure 4 , Figure 5 and Figure 6 A ball joint rod 364 is fixedly connected to one end of the sleeve 361 away from the central axis of the tank 1. The end of the ball joint rod 364 away from the central axis of the tank 1 is slidably connected to the inclined surface of the swashplate 363. A bevel gear 365 is fixedly installed at one end of the swashplate 363 away from the central axis of the tank 1. A bevel gear ring 366 is installed on the inner wall of the seed distribution cover 2. Both the left and right bevel gears 365 mesh with the bevel gear ring 366.

[0042] In practical use, when the upper rotating shaft 31 drives the side rod 34 to rotate, the side rod 34 drives the bevel gear 365 at its end to rotate along the bevel gear ring 366. The bevel gear ring 366 drives the bevel gear 365 and the swashplate 363 to rotate. When the swashplate 363 rotates, it pulls the sleeve 361 along the length of the side rod 34 through the ball joint connecting rod 364 to move back and forth. The sleeve 361 drives the dispersing blade 35 to move back and forth, which can make the dispersing blade 35 move the seed crystals back and forth, further promoting the generation of turbulence in the water and preventing the generation of vortices when the side rod 34 rotates, causing the seed crystals to gather towards the center. When the sleeve 361 moves back and forth along the side rod 34, the compression spring 362 can give the sleeve 361 a spring force to move away from the central axis of the tank 1, which facilitates the sleeve 361 to move and reset away from the central axis of the tank 1.

[0043] Please see Figure 6 and Figure 7The side rod 34 has a sliding groove 341 inside. The rotating assembly 37 includes a slide block 371 that is slidably installed inside the sliding groove 341 along its length. A central shaft 372 is rotatably installed on the slide block 371. The front and rear ends of the central shaft 372 are fixedly connected to the corresponding dispersion blades 35. Partition plates 373 distributed on the left and right sides of the central shaft 372 are fixedly installed inside the slide block 371. Rotating plates 374 are fixedly connected to the upper and lower sides of the central shaft 372. Return springs 375 are fixedly connected between the left and right sides of the lower partition plate 373 and the corresponding partition plate 373. A ladder 376 corresponding to the slide block 371 is installed on the top wall of the sliding groove 341. The ladder 376 is an isosceles trapezoid with the length of the base side being less than the length of the top side. The upper rotating plate 374 slides in cooperation with the corresponding ladder 376.

[0044] In practical use, when the sleeve 361 drives the dispersing blade 35 to reciprocate along the length of the side rod 34, the dispersing blade 35 drives the slide 371 to reciprocate in the slide groove 341 via the central shaft 372. When the central shaft 372 is located on the side of the corresponding ladder 376 away from the central axis of the tank 1, the return springs 375 on both sides simultaneously push the lower rotating plate 374, making the rotating plate 374 vertical. At this time, the dispersing blade 35 is vertical. When the slide 371 moves towards the central axis of the tank 1, the central shaft 372 moves to the bottom of the corresponding ladder 376. At this time, the ladder 376 will push the upper rotating plate 374 to deflect away from the central axis of the tank 1. The upper rotating plate 374 drives the central shaft 372 and the dispersing blade 35 to deflect away from the central axis of the tank 1. When the dispersing blade 35 moves towards the central axis of the tank 1, it can provide a component force for the seed crystal to move upward, slowing down the falling speed of the seed crystal.

[0045] When the central shaft 372 moves to the side of the corresponding platform 376 that is close to the central axis of the tank 1, the platform 376 no longer pushes the upper rotating plate 374. At this time, the rotating plate 374 returns to the vertical state under the action of the return spring 375. Then, the sleeve 361 drives the dispersing blade 35 to move away from the central axis of the tank 1. When the central shaft 372 moves to the bottom of the corresponding platform 376, the platform 376 pushes the upper rotating plate 374 to deflect towards the central axis of the tank 1, so that the dispersing blade 35 can provide the seed crystal with an upward force when moving in different directions, thus slowing down the falling speed of the seed crystal.

[0046] Please see Figure 2 and Figure 8The lifting assembly 43 includes a sleeve 431 that is slidably mounted on the lower rotating shaft 41. The spiral blade 42 is fixedly mounted on the outer ring wall of the sleeve 431 by a support rod. A retaining ring 432 located below the sleeve 431 is fixedly mounted on the lower rotating shaft 41. A compression spring 433 fitted outside the lower rotating shaft 41 is fixedly connected between the top of the retaining ring 432 and the bottom of the sleeve 431. The compression spring 433 is in a compressed state. A wave-shaped guide bar 434 located above the spiral blade 42 is fixedly mounted on the inner wall of the tank 1. Guide rods 435 are symmetrically mounted on the outer ring wall of the sleeve 431. The end of the guide rod 435 away from the central axis of the tank 1 slides against the bottom of the guide bar 434.

[0047] In practical use, the compression spring 433 provides an upward force to the spiral blade 42, giving it an upward tendency. The lower rotating shaft 41 drives the sleeve 431 to rotate, which in turn drives the spiral blade 42 and the guide rod 435 to rotate. When the guide rod 435 rotates, the wave-shaped guide bar 434 pushes the guide rod 435 to move up and down periodically. The rotation of the spiral blade 42 provides an upward thrust to the water, slowing down the falling speed of the seed crystals and allowing them to fully contact the water, thus improving the seed crystals' treatment effect on hard water.

[0048] Please see Figure 2 and Figure 8 A stirring turbine 44 is fixedly installed at the bottom end of the lower rotating shaft 41, and a baffle 45 located between the stirring turbine 44 and the retaining ring 432 is fixedly installed on the inner wall of the tank body 1. The baffle 45 is cross-shaped and rotatably connected to the lower rotating shaft 41.

[0049] In practical use, the stirring turbine 44 stirs the water and the seed crystals, allowing the seed crystals to mix continuously with the water, promoting contact between the seed crystals and the water, which is beneficial for the treatment of hard water by the seed crystals. The baffle 45 can act as a barrier to prevent vortices from forming in the water during stirring and to prevent the seed crystals from agglomerating.

[0050] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, an integral connection, or a sliding connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A wastewater treatment system integrating seed crystal stirring and hard water contact, characterized in that: The device includes a tank (1) and a seed distribution cover (2) installed inside the tank (1), and also includes a dispersion mechanism (3). The dispersion mechanism (3) includes an upper rotating shaft (31) rotatably mounted on the seed distribution cover (2). Side rods (34) are fixedly connected to both the left and right sides of the upper rotating shaft (31). Several dispersion blades (35) are installed at equal intervals on both the front and rear sides of the side rods (34). A moving component (36) is installed on the side rods (34) to drive the dispersion blades (35) to reciprocate along the length direction of the side rods (34) as the upper rotating shaft (31) rotates, and a rotating component (37) is used to drive the dispersion blades (35) to flip. The stirring mechanism (4) includes a lower rotating shaft (41) coaxially fixedly connected to the bottom of the upper rotating shaft (31). A spiral blade (42) is slidably mounted on the lower rotating shaft (41). A lifting assembly (43) is installed on the inner wall of the tank (1) to drive the spiral blade (42) to move up and down as the lower rotating shaft (41) rotates. A drive motor (5) is fixedly mounted on the top of the tank (1) and is used to drive the upper rotating shaft (31) to rotate. When the moving component (36) drives the dispersing blade (35) to change its direction of movement, the rotating component (37) drives the dispersing blade (35) to rotate 90 degrees.

2. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 1, characterized in that: The seed distribution cover (2) is funnel-shaped with the large end facing down. A dosing pipe (21) is fixedly installed on the outer ring wall of the tank (1). One end of the dosing pipe (21) near the central axis of the tank (1) is fixedly connected to and communicates with the small end of the seed distribution cover (2). A grid plate (22) is fixedly installed on the large end of the seed distribution cover (2). The bottom end of the upper rotating shaft (31) rotates through to the bottom of the grid plate (22).

3. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 1, characterized in that: The upper rotating shaft (31) is fixedly fitted with a material distribution wheel (32) located inside the seed distribution cover (2). The material distribution wheel (32) is funnel-shaped with the large end facing down. Several circumferentially evenly distributed paddles are fixedly connected to the outer ring wall of the material distribution wheel (32). The vertical section of the material distribution wheel (32) is at the same height as the feeding tube (21).

4. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 1, characterized in that: The upper rotating shaft (31) is fixedly installed with a mixing blade (33) located between the material distribution wheel (32) and the side rod (34). The mixing blade (33) and the side rod (34) are distributed in a cross shape when projected vertically.

5. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 1, characterized in that: The moving component (36) includes a sleeve (361) that is slidably mounted on the side rod (34) along its length direction. Several of the dispersing blades (35) are rotatably connected to the sleeve (361). A compression spring (362) fitted outside the side rod (34) is fixedly connected between the end of the sleeve (361) near the central axis of the tank (1) and the outer ring wall of the upper rotating shaft (31). A swash plate (363) for driving the sleeve (361) to make piston movements is rotatably mounted on the end of the side rod (34) away from the central axis of the tank (1).

6. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 5, characterized in that: The end of the sleeve (361) away from the central axis of the tank (1) is fixedly connected to a ball joint rod (364). The end of the ball joint rod (364) away from the central axis of the tank (1) is slidably connected to the inclined surface of the swashplate (363). A bevel gear (365) is fixedly installed at the end of the swashplate (363) away from the central axis of the tank (1). A bevel gear ring (366) is installed on the inner wall of the seed distribution cover (2). Both the left and right bevel gears (365) mesh with the bevel gear ring (366).

7. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 6, characterized in that: The side rod (34) has a groove (341) inside. The rotating assembly (37) includes a slide block (371) that is slidably installed inside the groove (341) along its length. A central shaft (372) is rotatably installed on the slide block (371). The front and rear ends of the central shaft (372) are respectively fixedly connected to the corresponding dispersion blades (35). The slide block (371) has partitions (373) fixedly installed inside the slide block (371) on the left and right sides of the central shaft (372). Rotating plates (374) are fixedly connected to both the upper and lower sides of the central shaft (372). Reset springs (375) are fixedly connected between the left and right sides of the lower partition (373) and the corresponding partition (373). A ladder (376) corresponding to the slide block (371) is installed on the top wall of the slide groove (341). The ladder (376) is an isosceles trapezoid with the length of the base side being less than the length of the top side. The rotating plate (374) above slides in cooperation with the corresponding ladder (376).

8. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 1, characterized in that: The lifting assembly (43) includes a sleeve two (431) that is slidably mounted on the lower rotating shaft (41). The spiral blade (42) is fixedly mounted on the outer ring wall of the sleeve two (431) by a support rod. A retaining ring (432) located below the sleeve two (431) is fixedly mounted on the lower rotating shaft (41). A compression spring two (433) fitted outside the lower rotating shaft (41) is fixedly connected between the top of the retaining ring (432) and the bottom of the sleeve two (431). A wave-shaped guide strip (434) located above the spiral blade (42) is fixedly mounted on the inner wall of the tank (1). Guide rods (435) are symmetrically mounted on the outer ring wall of the sleeve two (431). One end of the guide rod (435) away from the central axis of the tank (1) slides against the bottom of the guide strip (434).

9. The wastewater treatment system integrating seed crystal stirring and hard water contact according to claim 8, characterized in that: A stirring turbine (44) is fixedly installed at the bottom end of the lower rotating shaft (41), and a baffle (45) is fixedly installed on the inner wall of the tank (1) between the stirring turbine (44) and the retaining ring (432). The baffle (45) is cross-shaped and rotatably connected to the lower rotating shaft (41).

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