An integrated wastewater treatment method for enhancing flocculation process

Abstract

The application provides an integrated sewage treatment method for strengthening flocculation process. A impeller assembly rotates in a flocculation tank. First dosing holes at different axial positions of a distribution pipe and second dosing holes on all blades of an outer blade assembly and an inner blade assembly spray flocculants outward during rotation, and the flocculants are mixed with peripheral water to form a mixed liquid. Each blade of the impeller assembly rotates to generate unstable rotating fluids in a sine shape formed by convex annular fluids and concave annular fluids from top to bottom in turn. The unstable rotating fluids improve flow performance in the depth direction, effectively strengthen the spatial agglomeration effect of flocs, and the rotating fluids and the mixed liquid formed by the distribution pipe and the second dosing holes spraying flocculants are mixed and collided with each other, accelerate the growth of flocs, and improve the radial agglomeration effect of flocs in the whole circumference. The application provides an integrated sewage treatment method for strengthening flocculation process, effectively improves the flocculation effect in the whole space, and creates conditions for efficient sedimentation.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to an integrated wastewater treatment method with enhanced flocculation process. Background Technology

[0002] Integrated wastewater treatment devices are widely used for treating rural domestic sewage. Among these, the flocculation process significantly impacts the formation and growth of flocs and the subsequent sedimentation. Existing frame-type agitator impellers generate fluid rotating around a drive shaft for flocculation, but they have the following drawbacks: 1. Poor collision effect of flocs in the vertical direction, affecting the mixing and flocculation effect; 2. Uneven flocculation effect in different radial directions; 3. Poor vertical and radial fluid flow in the flocculation tank, resulting in uneven flocculation effect throughout the space. Summary of the Invention

[0003] This invention provides an integrated wastewater treatment method that enhances flocculation, effectively improving the flocculation effect throughout the entire space and creating conditions for efficient sedimentation.

[0004] To address the aforementioned technical problems, embodiments of the present invention provide an integrated wastewater treatment method with enhanced flocculation process, comprising the following steps: Step 10: Start the drive unit. The impeller assembly rotates in the flocculation tank to stir and mix the water. Step 20: The first outlet holes at different axial positions of the distribution pipe spray flocculant downwards and at an angle downwards. Under the action of centrifugal force, the flocculant moves in a parabolic motion in the direction of rotation and downwards, continuously mixing with the water below, in front, and behind. It mixes with water bodies of different radii and heights, causing the flocs to grow continuously in the curved motion, realizing a three-dimensional floc growth process. The second outlet holes on all blades of the outer blade assembly and the inner blade assembly spray flocculant outwards at an angle during rotation, mixing with the surrounding water to form a mixed liquid. Step 30: In each blade, the convex blade forms a convex annular fluid with the drive shaft as its axis, and the concave blade forms a concave annular fluid with the drive shaft as its axis. The convex and concave annular fluids are connected end to end from top to bottom, forming a sinusoidal rotating fluid with the drive shaft as its axis. The convex and concave annular fluids have different diffusion effects at different heights, which enhances the turbulence effect and thus accelerates the three-dimensional mixing and aggregation of flocs. The unstable rotating fluid improves the flow performance in the depth direction and effectively enhances the spatial aggregation effect of flocs inside and outside the rotation range of the blade shaft. Step 40: In a certain circumferential direction, the most unstable convex or concave annular fluid at the uppermost end of the inner blades, under the action of the mixture formed by the downward and obliquely downward spraying of flocculant from the first outlet, moves downward and mixes with the water below; the most unstable convex or concave annular fluid at the uppermost end of the outer blades, under the action of the mixture formed by the downward and obliquely downward spraying of flocculant from the first outlet, moves downward and mixes with the water below; simultaneously, due to the outward spraying of the mixture formed by flocculant from the second outlet on the inner blades, the mixture impacts and breaks down the outer blades. The convex or concave annular fluid accelerates its downward movement and mixes with the water below, causing the flocs to grow larger. The enlarged flocs then mix again with the unstable concave or convex annular fluid below and the downward-moving fluid above, effectively enhancing the growth of the flocs in the height direction. This process continuously strengthens the growth of the flocs in the height direction. Some flocs with higher density and volume move downward and continuously collide, mix, and grow with the lower-density flocs below, thus effectively balancing the flocs in the height direction in the flocculation tank.

[0005] Step 50: The inner rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe and the mixture formed by the inclined downwards from the pressure plate. The three streams of flocs in different motion states collide and agglomerate with each other, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe and the mixture formed by the inclined downwards from the pressure plate. They also mix and collide with the mixture formed by the flocculant sprayed outwards from the second outlet hole, causing the flocs in different motion states to collide and agglomerate with each other, accelerating the growth of the flocs and improving the radial agglomeration effect of the flocs throughout the entire circumference. The convex and concave annular fluids formed by the outer blades mix and collide with the mixtures formed by the flocculant injected downwards through the distribution pipe, the mixture formed by the inclined downwards through the pressure plate, and the mixture formed by the inner blades. Multiple streams of flocs in different motion states collide and agglomerate, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the outer blades mix and collide with the mixtures formed by the flocculant injected downwards through the distribution pipe, the mixture formed by the inclined downwards through the pressure plate, and the mixture formed by the flocculant injected outwards through the second outlet. This causes the flocs in different motion states to collide and agglomerate, accelerating floc growth and improving the radial agglomeration effect of the flocs throughout the entire circumference.

[0006] As a further improvement to the embodiments of the present invention, it also includes: Step 60: The blades of the three sets of outer blades are set with different initial phase angles, so that the flocs at different radii on the same horizontal plane of the outer ring mixture alternately mix and collide, thereby making the flocs continuously increase in size; The blades of the three inner blade groups are set with different initial phase angles, so that the flocs at different radii on the same horizontal plane of the inner ring mixture alternately mix and collide, thereby making the flocs continuously increase in size.

[0007] As a further improvement to the embodiments of the present invention, it also includes: Step 70: The fluid width formed by the three sets of outer blades changes alternately, and the stirring and mixing range also changes alternately, which enhances the mixing and flocculation effect inside and outside the outer ring; the fluids of different widths are mixed alternately in the circumferential and radial directions, so that the flocs collide and increase in size continuously in the circumferential and radial directions, further improving the growth of the flocs. The alternating widths of the fluids formed by the three sets of inner blades, along with the alternating ranges of stirring and mixing, enhance the mixing and flocculation effect between the inner and outer rings. The alternating mixing of fluids of different widths in the circumferential and radial directions causes the flocs to continuously collide and increase in size in both directions, further improving floc growth.

[0008] As a further improvement to this embodiment of the invention, step 70 further includes: The inner and outer blade groups form fluid widths that change in opposite directions. The sinusoidal fluids with different heights, radii, and widths effectively enhance and balance the mixing and flocculation effects in the space.

[0009] As a further improvement to the embodiments of the present invention, it also includes: Step 80: In each cycle along the height direction, the rotating fluids formed by the convex and concave sub-blades of the inner blades in the same circumferential direction are 2π / 3 ahead or behind the rotating fluids formed by the convex and concave sub-blades of the outer blades. The flow patterns are different in both the radial and height directions. Therefore, the fluids formed by the inner and outer blades interact with each other in space, causing the flocs to collide and aggregate continuously in the radial and circumferential directions at different heights, thus accelerating the growth of the flocs. The mixture formed by the rotating injection of flocculant from the first outlet hole forms fluids with different floc contents at different heights, in different radial directions, and in different circumferential directions, which strengthens the continuous collision and aggregation of the flocs, further accelerating the growth of the flocs. Since there is a phase difference between the first outer blade and the adjacent second and third outer blades, and a phase difference between the first inner blade and the adjacent second and third inner blades, and a phase difference between the inner and outer blades in the same circumferential direction, the fluids formed by the inner and outer blades with different phase differences also collide and aggregate continuously in the radial and circumferential directions at different heights, causing the flocs to increase in size further.

[0010] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: This invention provides an integrated wastewater treatment method for enhancing flocculation. Three sets of outer impeller assemblies are uniformly arranged along the circumference of the drive shaft. Each outer impeller assembly includes two outer blades symmetrically arranged around an axis of symmetry. The outer blades are sinusoidal hollow blades with discharge holes. Each blade's rotation generates a sinusoidally unstable fluid formed by alternating convex and concave annular fluids from top to bottom, significantly improving the flow performance in the depth direction. This effectively enhances the spatial aggregation effect of flocs within and outside the blade shaft's rotation range, intensifying the spatial mixing and collision of the fluid, thereby effectively strengthening floc growth. Furthermore, three sets of inner impeller assemblies are uniformly arranged between the outer impeller assemblies and the drive shaft along the circumference of the drive shaft. Each inner impeller assembly includes two inner blades symmetrically arranged around an axis of symmetry. The inner blades are sinusoidal hollow blades with discharge holes. Each blade's rotation generates a sinusoidally unstable fluid formed by alternating convex and concave annular fluids from top to bottom, further intensifying the spatial mixing and collision of the fluid, and further enhancing floc growth.

[0011] The phase angles and amplitudes of the inner and outer blade groups at the same height are different. The inner and outer blades of each group generate three-dimensional annular fluids at different heights and radii, realizing the spatial mixing of multiple sinusoidal annular fluids. This enables the flocs to continuously collide and grow at different heights, radii, and circumferences, continuously accelerating the aggregation of flocs and improving the rapid and efficient sedimentation of sludge. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the flocculation device used in the integrated wastewater treatment method provided in this embodiment of the invention; Figure 2 yes Figure 1 A schematic diagram of the structure of the middle impeller assembly when it rotates 60 degrees; Figure 3 yes Figure 1 A schematic diagram of the structure of the middle impeller assembly when it rotates 120 degrees; Figure 4 This is a schematic diagram of the structure of the first outer blade and the first inner blade in this embodiment; Figure 5 This is a schematic diagram of the structure of the second outer blade and the second inner blade in this embodiment; Figure 6 This is a schematic diagram of the structure of the third outer blade and the third inner blade in this embodiment; Figure 7 This is a schematic diagram of the water pressure plate in this embodiment; Figure 8 This is a schematic diagram of the fit between the bearing and the drive shaft in this embodiment; Figure 9 This is a schematic diagram of the upper ring tube in this embodiment; Figure 10 This is a schematic diagram of the cross-section of the blade in this embodiment.

[0013] The diagram shows: drive component 1, transmission shaft 2, shaft hole 21, connecting shaft 22, outer impeller assembly 3, first outer blade 31, first concave blade 311, first convex blade 312, second drug outlet hole 313, inner side surface 314, outer side surface 315, second outer blade 32, second concave blade 321, second convex blade 322, third outer blade 33, third concave blade 331, third convex blade 332, inner impeller assembly 4, first inner blade 41, second inner blade 42, third inner blade 43, bearing 5, connecting hole 51, drug dosing pipe 6, fixing ring 7, upper ring pipe 71, upper outer ring pipe 711, upper inner ring pipe 712, distribution pipe 713, pressure plate 714, first drug outlet hole 715, and lower ring pipe 72. Detailed Implementation

[0014] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings.

[0015] This invention provides an integrated wastewater treatment method that enhances flocculation, by installing a flocculation device in a flocculation tank. For example... Figure 1 As shown, the flocculation device includes a drive component 1, a transmission shaft 2, an impeller assembly, and a dosing pipe 6. The drive component 1 is fixed to the top of the flocculation tank. The top end of the transmission shaft 2 is connected to the drive component 1, and the bottom end is mounted on the bottom of the flocculation tank via a bearing 5. Preferably, the transmission shaft 2 is a hollow shaft. Figure 8 As shown, the bottom end of the drive shaft 2 is provided with a connecting shaft 22. The outer diameter of the upper end of the connecting shaft 22 is adapted to the inner hole of the drive shaft 2, and the outer diameter of the lower end of the connecting shaft 22 is adapted to the inner hole of the bearing 5. The center of the connecting shaft 22 is provided with a shaft hole 21, which communicates with the inner cavity of the drive shaft 2. The side wall of the bearing 5 is provided with a connecting hole 51, which is located below the connecting shaft 22. The lower end of the dosing pipe 6 is connected to the connecting hole 51, and the upper end extends out of the top of the flocculation tank.

[0016] The retaining ring 7 is fixed to the drive shaft 2. Preferably, as follows: Figures 1-3 As shown, the retaining ring 7 includes an upper ring tube 71 and a lower ring tube 72 arranged vertically along the drive shaft axial direction. Figure 9 As shown, the upper ring pipe 71 includes an upper inner ring pipe 712 and an upper outer ring pipe 711 arranged coaxially. The upper inner ring pipe 712 is fixed on the drive shaft 2 and is connected to the drive shaft 2. Six horizontally arranged distribution pipes 713 are evenly connected circumferentially between the upper outer ring pipe 711 and the upper inner ring pipe. The distribution pipes 713 are connected to the upper inner ring pipe 712, and the end of the distribution pipe 713 connected to the upper outer ring pipe 711 is closed. The dosing pipe 6 is connected sequentially through the bearing 5, the drive shaft 2, the upper inner ring pipe 712, and the six distribution pipes 713.

[0017] Preferably, the distribution pipe 713 is provided with a plurality of first discharge holes 715, which are densely distributed on the pipe wall below the horizontal plane of its axis. The diameter of the first discharge holes 715 is 0.5-3 mm. When the distribution pipe 713 rotates synchronously with the drive shaft 2, the flocculant is sprayed downward and obliquely downward from the first discharge holes 715 located at different axial positions of the distribution pipe (located at different radial positions of the impeller assembly). At the same time, under the action of centrifugal force, it moves in a parabolic motion in the direction of rotation and downward and obliquely downward, continuously mixing with the water below and in front and behind. It mixes with water of different radii and heights in the flocculation tank, causing the flocs to grow continuously in the curved motion, realizing a three-dimensional floc growth process. Subsequently, under the action of the impeller assembly, it further mixes and collides with the surrounding water, continuously strengthening the growth of the flocs.

[0018] The impeller assembly includes an outer impeller assembly 3, which is installed between the upper annular pipe 71 and the lower annular pipe 72. The outer impeller assembly 3 includes a first outer blade group, a second outer blade group, and a third outer blade group, which are evenly installed circumferentially between the upper annular pipe 71 and the lower annular pipe 72 along the drive shaft 2. Figure 1 As shown, the first outer blade group includes two first outer blades 31. The top ends of the two first outer blades are respectively mounted on two distribution pipes 713 located on the same straight line. The first outer blades are vertically arranged, and their bottom ends are mounted on the lower ring pipe 72. The two first outer blades are symmetrically arranged about the axis of the drive shaft. Figure 2 As shown, the second outer blade assembly includes two second outer blades 32, which are respectively mounted on two distribution pipes 713 located on the same straight line. The second outer blades are vertically arranged, with their bottom ends mounted on the lower ring pipe 72. The two second outer blades are symmetrically arranged about the axis of the drive shaft. Figure 3 As shown, the third outer blade group includes two third outer blades 33, which are respectively mounted on two distribution pipes 713 located on the same straight line. The third outer blades are vertically arranged, with their bottom ends mounted on the lower ring pipe 72. The two third outer blades are symmetrically arranged about the axis of the drive shaft. Thus, along the drive shaft, the sequence is: first outer blade 31, second outer blade 32, third outer blade 33, first outer blade 31, second outer blade 32, third outer blade 33, with a circumferential spacing of 60° between adjacent outer blades.

[0019] like Figure 1 and Figure 4 As shown, the vertical cross-section of the first outer blade 31 is a surface composed of two parallel sine curves. (As indicated...) Figure 2 and Figure 5 As shown, the vertical cross-section of the second outer blade 32 is a surface composed of two parallel sine curves. (As...) Figure 3 and Figure 6As shown, the vertical cross-section of the third outer blade 33 is a surface composed of two parallel sine curves. Taking the top of the outer blade (i.e., the end connected to the distribution pipe) as the origin, the vertical direction is the x-axis, and the horizontal direction is the y-axis. The curve function of the sine curve in the vertical cross-section of the first outer blade 31 is y=A1sinx, with an initial phase angle of 0. The curve function of the sine curve in the vertical cross-section of the second outer blade 32 is y=A2sin(x+2π / 3), with an initial phase angle of 2π / 3. The curve function of the sine curve in the vertical cross-section of the third outer blade 33 is y=A3sin(x+4π / 3), with an initial phase angle of 4π / 3. The first, second, and third outer blades all have cavities, and each of the first, second, and third outer blades has a second discharge port 313. All outer blades are connected to the distribution pipe.

[0020] During operation, the pressurized coagulant enters the cavity at the bottom of the bearing 5 through the dosing pipe 6, then flows upwards into the inner cavity of the drive shaft 2, then through the drive shaft 2 into the upper inner ring pipe, then into the six distribution pipes, and finally into all the blade cavities. A portion of the flocculant is sprayed downwards and obliquely downwards into the flocculation tank through the first outlet hole, and a portion of the flocculant is sprayed into the flocculation tank through the second outlet hole 313.

[0021] like Figure 4 As shown, the first outer blade 31 includes a plurality of first convex blades 312 and first concave blades 311 connected alternately. The protruding direction of the first convex blades 312 faces away from the drive shaft, and the protruding direction of the first concave blades 311 faces the drive shaft. The first outer blade 31 rotates around the drive shaft. The initial phase angle of the first outer blade is 0. In the range of (0 to π / 2), the radius of rotation of the first convex blade 312 gradually increases from top to bottom, and the radius of rotation is the maximum when it reaches π / 2. In the range of (π / 2 to π), the radius of rotation of the first convex blade 312 gradually decreases from top to bottom, and the radius of rotation is equal to the radius of rotation of the axis of the first outer blade when it reaches π. Within the range of (π to 3π / 2), the radius of gyration of the first concave blade 311 gradually decreases from top to bottom, reaching its minimum at 3π / 2. Within the range of (3π / 2 to 2π), the radius of gyration of the first concave blade gradually increases from top to bottom, reaching its minimum at 2π, equal to the radius of gyration of the blade axis. Similarly, the second convex blade, ..., and the last convex blade are identical to the first convex blade, and the second concave blade, ..., and the last concave blade are identical to the first concave blade. The first convex blade 312 forms a convex annular fluid, and the first concave blade 311 forms a concave annular fluid; the convex and concave annular fluids alternate sequentially from top to bottom.

[0022] like Figure 5As shown, the second outer blade 32 includes several second convex blades 322 and second concave blades 321 connected alternately in sequence. The protruding direction of the second convex blades 322 faces away from the drive shaft, and the protruding direction of the second concave blades 321 faces the drive shaft. The second outer blade 32 rotates around the drive shaft, and the initial phase angle of the second outer blade is 2π / 3, with the second outer blade leading the first outer blade by 2π / 3. Within the range of (2π / 3 to π), the radius of gyration of the first second convex blade 322 gradually decreases from top to bottom. When it reaches π, the radius of gyration is equal to the radius of gyration of the axis of the second outer blade 32. Within the range of (π to 3π / 2), the radius of gyration of the first second concave blade 321 gradually decreases from top to bottom. When it reaches 3π / 2, the radius of gyration of the first second concave blade 321 reaches its minimum. Within the range of (3π / 2 to 2π), the radius of gyration of the first second concave blade 321 gradually increases from top to bottom. When it reaches 2π, the radius of gyration is equal to the radius of gyration of the axis of the second outer blade. Within the range of (2π to 5π / 2), the radius of gyration of the second convex blade 322 gradually increases from top to bottom, reaching its maximum at 5π / 2. Within the range of (5π / 2 to 3π), the radius of gyration of the second convex blade 322 gradually decreases from top to bottom, reaching its maximum at 3π, which is the same as the radius of gyration of the axis of the second outer blade 32. Similarly, the second concave blade, ..., and the last concave blade are identical to the first concave blade, and the third convex blade, ..., and the last convex blade are identical to the second convex blade. The second convex blade 322 forms a convex annular fluid, and the second concave blade 321 forms a concave annular fluid; the convex and concave annular fluids alternate sequentially from top to bottom.

[0023] like Figure 6As shown, the third outer blade 33 includes several third convex sub-blades 332 and third concave sub-blades 331 connected alternately. The protruding direction of the third convex sub-blades 332 faces away from the drive shaft, and the protruding direction of the third concave sub-blades 331 faces the drive shaft. The third outer blade 33 rotates around the drive shaft. The initial phase angle of the third outer blade is 4π / 3, leading the second outer blade by 2π / 3 and leading the first outer blade by 4π / 3. Within the range of (4π / 3 to 2π), the radius of gyration of the first third concave blade 331 gradually increases from top to bottom. When it reaches 2π, the radius of gyration of the first third concave blade 331 is the same as the radius of gyration of the axis of the third outer blade. Within the range of (2π to 5π / 2), the radius of gyration of the first third convex blade 332 gradually increases from top to bottom. When it reaches 5π / 2, the radius of gyration of the first third convex blade 332 reaches its maximum. Within the range of (5π / 2 to 3π), the radius of gyration of the first third convex blade 332 gradually decreases from top to bottom. When it reaches 3π, the radius of gyration of the first third convex blade 332 is the same as the radius of gyration of the axis of the third outer blade. Within the range of (3π to 10π / 3), the gyration radius of the second third concave blade 331 gradually decreases from top to bottom, reaching its minimum at 10π / 3. Within the range of (10π / 3 to 4π), the gyration radius of the second third concave blade 331 gradually increases from top to bottom, reaching its minimum at 4π, where it equals the gyration radius of the third outer blade axis. Similarly, the second third convex blade, ..., and the last third convex blade are identical to the first third convex blade, and the third third concave blade, ..., and the last third concave blade are identical to the second third concave blade. The third convex blade 332 forms a convex annular fluid, and the third concave blade 331 forms a concave annular fluid; the convex and concave annular fluids alternate sequentially from top to bottom.

[0024] exist Figures 4-6In each outer blade, the concave blade rotates around the drive shaft 2 to form a concave annular fluid. The radius of gyration of the concave annular fluid varies at different heights, exhibiting a sinusoidal unstable state and being spaced out. The convex blade rotates around the drive shaft 2 to form a convex annular fluid. The radius of gyration of the convex annular fluid also varies at different heights, exhibiting a sinusoidal unstable state and being spaced out. Because several convex and concave annular fluids are spaced out along the height direction, the flow performance in the depth direction is greatly improved, effectively enhancing the floc aggregation effect within and outside the blade shaft's rotation range. The periodically distributed, sinusoidal convex and concave annular fluids along the height direction, in a spatially unstable state, intensify the spatial mixing and collision effects of the fluids, thereby effectively enhancing floc growth. In a certain circumferential direction, the most unstable (phase angle not equal to 0) convex or concave annular fluid at the top moves downward and mixes with the water below, causing the flocs to increase in size. The increased flocs then mix again with the unstable concave or convex annular fluid below and the fluid after the convex or concave annular fluid above has moved downward, effectively enhancing the increase of the flocs in the height direction... and so on, continuously enhancing the increase of the flocs in the height direction.

[0025] like Figures 4-6 As shown, the radii of rotation of the sub-blades at different heights are different, resulting in different tangential velocities of the fluid. Consequently, the tangential velocities of the flocculant ejected from the second outlet 313 at the corresponding radii of rotation are also different. At different heights within the flocculation tank, the fluid states (velocity magnitude, direction, and mixing radius) differ, thus enhancing the collision and mixing effects of fluids in different states and effectively improving the floc growth process. To create conditions for enhanced and balanced floc growth at the lower levels, some flocs with higher density and volume move downwards, continuously colliding and mixing with lower-density flocs, thereby further promoting floc growth and ensuring effective height-level balance of flocs within the flocculation tank.

[0026] Because the tangential velocity of the fluid varies at different heights, and both convex and concave annular fluids are sinusoidal and in an unstable state, their outward and inward diffusion effects differ at different heights. This enhances the turbulence effect of the convex and concave annular fluids, thereby accelerating the three-dimensional mixing and aggregation of flocs. The different tangential velocities of the sinusoidal fluids in the height direction and their varying coverage in the radial direction improve the flow performance in the depth direction, enabling the convex and concave annular fluids to achieve spatial aggregation of flocs within and outside the blade's symmetry rotation range.

[0027] The initial phase angles of the first outer blade 31, the second outer blade 32, and the third outer blade 33 are 0, 2π / 3, and 4π / 3, respectively. By setting different initial phase angles, flocs of different radii in the mixture at any horizontal height alternately mix and collide, thereby continuously increasing the size of the flocs and effectively enhancing the floc growth process, creating conditions for subsequent efficient sedimentation.

[0028] Preferably, A1 < A2 < A3, meaning that the amplitude of the first outer blade protruding towards and away from the drive shaft is smaller than that of the second outer blade, the amplitude of the second outer blade is smaller than that of the third outer blade, the radial width of the fluid generated by the first outer blade 31 is smaller than that of the fluid generated by the second outer blade 32, and the width of the fluid generated by the second outer blade 32 is smaller than that of the fluid generated by the third outer blade 33. In other words, the width of the fluid generated by the three sets of outer blades changes alternately in the direction of rotation, and thus their stirring and mixing range also changes alternately. Fluids of different widths are mixed alternately in the circumferential and radial directions, causing the flocs to collide and increase continuously in the circumferential and radial directions, further improving the growth of the flocs and creating favorable conditions for subsequent sedimentation.

[0029] Preferably, the outer end rotation diameter of the distribution pipe 713 is 50-200 mm larger than the rotation diameter of the protruding blade in the outer impeller assembly 3, so as to ensure that the flocculant sprayed downward from the first discharge hole 715 below the distribution pipe interacts with the fluid formed by the protruding blade in the outer impeller assembly.

[0030] Preferably, the impeller assembly further includes an inner impeller assembly 4, which is installed between the upper ring pipe 71 and the lower ring pipe 72, and located between the drive shaft 2 and the outer impeller assembly 3. The inner impeller assembly 4 includes a first inner blade group, a second inner blade group, and a third inner blade group, which are uniformly installed circumferentially between the upper ring pipe 71 and the lower ring pipe 72 along the drive shaft 2. The first inner blade group and the first outer blade group are located on the same circumferential direction of the drive shaft, as are the second inner blade group and the second outer blade group, and the third inner blade group and the third outer blade group. The first inner blade group includes two first inner blades 41, the top end of which is mounted on a distribution pipe on which the first outer blade is installed. The first inner blades are vertically arranged, and their bottom ends are mounted on the lower ring pipe 72. The two first inner blades are symmetrically arranged about the axis of the drive shaft. The second inner blade group includes two second inner blades 42. The top end of each second inner blade is mounted on a distribution tube on which the second outer blade is installed. The second inner blades are vertically arranged, and their bottom ends are mounted on the lower ring tube 72. The two second inner blades are symmetrically arranged about the axis of the drive shaft. The third inner blade group includes two third inner blades 43. The top end of each third inner blade is mounted on a distribution tube on which the third outer blade is installed. The third inner blades are vertically arranged, and their bottom ends are mounted on the lower ring tube 72. The two third inner blades are symmetrically arranged about the axis of the drive shaft. Thus, along the inner circle of the drive shaft, the blades are arranged in sequence as follows: first inner blade 41, second inner blade 42, third inner blade 43, first inner blade 41, second inner blade 42, and third inner blade 43. The circumferential spacing between two adjacent inner blades is 60°.

[0031] like Figure 1 and Figure 4 As shown, the vertical cross-section of the first inner blade 41 is a surface composed of two parallel sine curves. Figure 2 and Figure 5 As shown, the vertical cross-section of the second inner blade 42 is a surface composed of two parallel sine curves. (As...) Figure 3 and Figure 6 As shown, the vertical section of the third inner blade 43 is a surface composed of two parallel sine curves. Taking the top of the inner blade (i.e., the end connected to the distribution pipe) as the origin, the vertical direction is the x-axis, and the horizontal direction is the y-axis. The curve function of the sine curve in the vertical section of the first inner blade 41 is y=B1sin(x+2π / 3), with an initial phase angle of 2π / 3. The curve function of the sine curve in the vertical section of the second inner blade 42 is y=B2sin(x+4π / 3), with an initial phase angle of 4π / 3. The curve function of the sine curve in the vertical section of the third inner blade 43 is y=B3sinx, with an initial phase angle of 0. The first, second, and third inner blades all have cavities, and each of the first, second, and third inner blades has a second discharge port 313. All inner blades are connected to the distribution pipe.

[0032] like Figure 4 As shown, the first inner blade 41 includes several first convex blades and first concave blades connected alternately. The protruding direction of the first convex blades faces away from the drive shaft, and the protruding direction of the first concave blades faces the drive shaft. The first inner blade 41 rotates around the drive shaft, with an initial phase angle of 2π / 3, leading the first outer blade by 2π / 3. Within the range of (2π / 3 to π), the radius of rotation of the first first convex blade gradually decreases from top to bottom. When it reaches π, the radius of rotation is the same as the radius of rotation of the axis of the first inner blade 41. Within the range of (π to 3π / 2), the radius of rotation of the first first concave blade gradually decreases from top to bottom. When it reaches 3π / 2, the radius of rotation of the first first concave blade reaches its minimum. Within the range of (3π / 2 to 2π), the radius of rotation of the first first concave blade 321 gradually increases from top to bottom. When it reaches 2π, the radius of rotation is equal to the radius of rotation of the axis of the first inner blade. Within the range of (2π to 5π / 2), the radius of gyration of the second first convex blade gradually increases from top to bottom, reaching its maximum at 5π / 2. Within the range of (5π / 2 to 3π), the radius of gyration of the second first convex blade gradually decreases from top to bottom, reaching its maximum at 3π, which is the same as the radius of gyration of the axis of the first inner blade. Similarly, the second first concave blade, ..., and the last first concave blade are identical to the first first concave blade, and the third first convex blade, ..., and the last first convex blade are identical to the second first convex blade. The first convex blades form a convex annular fluid, and the first concave blades form a concave annular fluid; the convex and concave annular fluids alternate sequentially from top to bottom.

[0033] like Figure 5As shown, the second inner blade 42 includes several second convex blades and second concave blades connected alternately in sequence. The protruding direction of the second convex blades faces away from the drive shaft, and the protruding direction of the second concave blades faces the drive shaft. The second inner blade 42 rotates around the drive shaft. The initial phase angle of the second inner blade is 4π / 3, leading the second outer blade by 2π / 3, and simultaneously leading the first inner blade by 2π / 3. Within the range of (4π / 3 to 2π), the radius of gyration of the first second concave blade gradually increases from top to bottom. When it reaches 2π, the radius of gyration of the first second concave blade is the radius of gyration of the axis of the second inner blade. Within the range of (2π to 5π / 2), the radius of gyration of the first second convex blade gradually increases from top to bottom. When it reaches 5π / 2, the radius of gyration of the first second convex blade reaches its maximum. Within the range of (5π / 2 to 3π), the radius of gyration of the first second convex blade gradually decreases from top to bottom. When it reaches 3π, the radius of gyration of the first second convex blade is the radius of gyration of the axis of the second inner blade. Within the range of (3π to 7π / 2), the radius of gyration of the second concave blade gradually decreases from top to bottom, reaching its minimum at 7π / 2. Within the range of (7π / 2 to 4π), the radius of gyration of the second concave blade gradually increases from top to bottom, reaching its minimum at 4π, where it equals the radius of gyration of the second inner blade axis. Similarly, the second convex blade, ..., and the last convex blade are identical to the first convex blade, and the third concave blade, ..., and the last concave blade are identical to the second concave blade. The second convex blade forms a convex annular fluid, and the second concave blade forms a concave annular fluid; the convex and concave annular fluids alternate sequentially from top to bottom.

[0034] like Figure 6As shown, the third inner blade 43 includes several third convex sub-blades and third concave sub-blades connected alternately. The protruding direction of the third convex sub-blades faces away from the drive shaft, and the protruding direction of the third concave sub-blades faces the drive shaft. The third inner blade 43 rotates around the drive shaft. The initial phase angle of the third inner blade is 0, leading the third outer blade by 2π / 3, and simultaneously leading the second inner blade by 2π / 3. In the interval (0 to π / 2), the radius of rotation of the first third convex sub-blade gradually increases from top to bottom, reaching its maximum when it reaches π / 2. In the interval (π / 2 to π), the radius of rotation of the first third convex sub-blade gradually decreases from top to bottom, reaching its maximum when it reaches π, equal to the radius of rotation of the axis of the third inner blade. Within the range of (π to 3π / 2), the radius of gyration of the first third concave blade gradually decreases from top to bottom, reaching its minimum at 3π / 2. Within the range of (3π / 2 to 2π), the radius of gyration of the first third concave blade gradually increases from top to bottom, reaching its minimum at 2π, equal to the radius of gyration of the axis of the third inner blade. Similarly, the second third convex blade, ..., and the last third convex blade are identical to the first third convex blade, and the second third concave blade, ..., and the last third concave blade are identical to the first third concave blade. The third convex blade forms a convex annular fluid, and the third concave blade forms a concave annular fluid; the convex and concave annular fluids alternate sequentially from top to bottom.

[0035] The initial phase angles of the first inner blade 41, the second inner blade 42, and the third inner blade 43 are 2π / 3, 4π / 3, and 0, respectively. By setting different initial phase angles, flocs of different radii in the inner ring mixture at any horizontal height alternately mix and collide, thereby continuously increasing the size of the flocs and effectively enhancing the floc growth process, creating conditions for subsequent efficient sedimentation.

[0036] exist Figures 4-6 In the inner impeller assembly 4, several convex blades (first convex blade, second convex blade, and third convex blade) and several concave blades (first concave blade, second concave blade, and third concave blade) in the first inner blade 41, second inner blade 42, and third inner blade 43 form periodic convex annular fluids (first convex annular fluid, second convex annular fluid, and third convex annular fluid) and concave annular fluids (first concave annular fluid, second concave annular fluid, and third concave annular fluid) in the height direction with different initial phase angles. In a certain circumferential direction, the most unstable convex annular fluid (phase angle not equal to 0) at the top moves downward and mixes with the water below. After the flocs further increase in size, they mix again with the unstable concave annular fluid or convex annular fluid below and the fluid after the convex annular fluid or concave annular fluid above moves downward, effectively strengthening the increase of flocs in the height direction... and so on, continuously strengthening the increase of flocs in the height direction.

[0037] Preferably, B1 > B2 > B3, meaning that the first inner blade protrudes more towards and away from the drive shaft than the second inner blade, the second inner blade protrudes more than the third inner blade, the width of the fluid generated by the first inner blade 41 in the radial direction is greater than the width of the fluid generated by the second inner blade, and the width of the fluid generated by the second inner blade is greater than the width of the fluid generated by the third inner blade. In other words, the width of the fluid generated by the three sets of inner blades changes alternately in the direction of rotation, and thus their stirring and mixing range also changes alternately. Fluids of different widths are mixed alternately in the circumferential and radial directions, causing the flocs to collide and increase continuously in the circumferential and radial directions, further improving the growth of the flocs and creating favorable conditions for subsequent sedimentation.

[0038] The first outer blade 31 (with the smallest amplitude in the outer impeller group) and the first inner blade (with the largest amplitude in the inner impeller group), the second outer blade 32 (with an amplitude between the amplitudes of the first and third outer blades) and the second inner blade (with an amplitude between the amplitudes of the first and third inner blades), the third outer blade 33 (with the largest amplitude in the outer impeller group) and the third inner blade (with the smallest amplitude in the inner impeller group) are arranged in the same circumferential direction, which enhances the radial mixing and collision effect of the flocs, and effectively balances the flocculation effect of radial mixing in different circumferential directions.

[0039] Preferably, the average amplitude of the inner impeller assembly 4 is 0.5 to 0.8 times that of the average amplitude of the outer impeller assembly 3. The inner blades are selected with a smaller amplitude, which can effectively balance the mixing, collision and enlargement of the flocs inside and outside the blade assembly.

[0040] The fluid widths formed by the first outer blade 31, the second outer blade 32, and the third outer blade 33 alternate in the outer ring, enhancing the flocculation effect both inside and outside the outer ring. Similarly, the fluid widths formed by the first inner blade, the second inner blade, and the third inner blade also alternate in the inner ring. Since the inner and outer blades are at the same circumferential angle (the same angle), the directions of the alternating fluid widths generated by the inner and outer blades are opposite. Therefore, the sinusoidal fluids with different heights, radii, and widths effectively enhance spatial mixing and flocculation, effectively improving floc growth.

[0041] exist Figure 4 In the middle, the initial phase angle of the first inner blade is 2π / 3, leading the first outer blade by 2π / 3; in Figure 5 In the middle, the initial phase angle of the second inner blade is 4π / 3, leading the second outer blade by 2π / 3; in Figure 6In the middle, the initial phase angle of the third inner blade is equal to 0, leading the third outer blade by 2π / 3. The phase angle of the inner blade leading (or lagging) the phase angle of the outer blade in the same circumferential direction has the following advantages: 1. In each cycle in the height direction, the rotating fluid formed by the convex / concave blades in the inner blades leads (or lags) the rotating fluid formed by the convex / concave blades in the outer blades by 2π / 3, and the flow states are different in the radial and height directions. Therefore, the fluids formed by the inner and outer blades have a certain interaction in space, which causes the flocs to continuously collide and aggregate in the radial and circumferential directions at different heights, thus accelerating the growth of the flocs; 2. The mixture formed by the rotating injection of flocculant from the first outlet 715 forms fluids with different floc contents at different heights, in different radial directions, and in different circumferential directions, which strengthens the continuous collision and aggregation of the flocs, further accelerating the growth of the flocs; 3. Since there is also a phase difference between the first outer blade and the adjacent second and third outer blades, as well as between the first inner blade and the adjacent second and third inner blades, the fluids formed by the inner and outer blades with different phase differences also continuously collide and aggregate in the radial and circumferential directions at different heights, further increasing the size of the flocs.

[0042] Inner and outer blades at the same height but with different phase angles generate different radial and circumferential fluids. At the same radius, the fluids generated by blades with different phase angles interact and collide, causing the flocs to continuously change their paths and mix and collide. At different heights and in a certain circumferential direction, the properties of the upper and lower layers and the radial fluids, such as velocity, direction, and floc concentration, also differ, causing the flocs to continuously change their paths and mix and collide, thus achieving a three-dimensional flocculation and growth process.

[0043] Preferably, any cross-section of all blades in the outer impeller assembly 3 and the inner impeller assembly 4 is as follows: Figure 10 As shown, the two surfaces of the blade parallel to the distribution pipe axis are planes, and the other two sides are arc surfaces. The distance between the two parallel planes is small, while their length is large. The two planes serve as working surfaces in a certain rotation direction. The rotating fluid mixes the sewage in the flocculation tank, causing the flocs to continuously increase in size during movement. The two sides are an inner surface 314 protruding towards the drive shaft and an outer surface 315 protruding away from the drive shaft. A second discharge port 313 is provided on the outer surface 315 away from the drive shaft. The second discharge port 313 is located on the outer side of the blades of the outer impeller assembly 3 and the inner impeller assembly 4, and is evenly distributed along the height direction. When the inner and outer blades rotate, flocculant with a certain pressure is sprayed outward and moves tangentially under the action of centrifugal force. Its synthesis velocity is the vector sum of the outward and tangential velocities, and the direction is tilted outward, effectively enhancing the mixing of the water outside the blades and the growth of the flocs.

[0044] The distribution density of the second outlet 313 gradually decreases from top to bottom, meaning the number of the first outlets on the horizontal plane gradually decreases. Setting different numbers of outlets along the height direction is beneficial for balancing floc size in that direction. Since the number of outlets at the top is greater than at the bottom, under the same head (pressure), the flocculant dosage injected at the top is greater than that at the bottom, thus enhancing the mixing and growth process of the flocs in the upper part of the flocculation tank. Some of the denser and larger flocs move downwards, continuously colliding and mixing with the less dense flocs at the bottom, further promoting floc growth and effectively balancing the floc size in the height direction within the flocculation tank.

[0045] The second outlet 313 sprays flocculant outward from the outer blade assembly 3 and the inner blade assembly 4, while simultaneously moving tangentially around the drive shaft 2 to generate a tangential velocity. The resultant velocity is the vector sum of the two velocities. The velocity of the mixture formed by the second outlet 313 of the inner impeller assembly 4 is lower than that of the mixture formed by the second outlet 313 of the outer impeller assembly 3 (due to different tangential velocities), and the spray direction is tilted outward. It first mixes with the surrounding water to form a mixture of smaller flocs. This mixture moves in a tilted outward direction, effectively increasing the movement path of the flocs. During the movement, it continuously strengthens the re-mixing and growth effect with the surrounding water, causing the flocs to continuously increase in size. Meanwhile, the first outlet 715 on the distribution pipe 713 sprays flocculant downward and at an angle downward. It first forms a mixture of smaller flocs with the water below and at an angle downward. This mixture moves tangentially on the horizontal plane inside and outside the rotation axis of the inner impeller assembly 4. The flocculant continuously mixes with the water below, at an angle downward, and in front and behind, causing the flocs to continuously grow. The direction of movement of the mixture at different radii is downward and forward. During the movement of the mixture, it continuously collides and aggregates with concave and convex annular fluids in different states of motion below, breaking the first convex or concave annular fluid, thereby causing the second, third, ... convex or concave annular fluids to be broken in succession, realizing spatial floc collision and aggregation, and effectively accelerating the three-dimensional growth of flocs.

[0046] like Figure 7 As shown, the pressure plate 714 is positioned above each inner and outer blade. The pressure plate 714 gradually rises upward along the rotation direction and is a convex arc shape with its center at the top. The width of the pressure plate is greater than the width of the inner and outer blades. When the pressure plate 714 rotates with the drive shaft 2, it causes the wastewater containing flocs to move forward and downward, increasing the movement path and changing the direction of the flocs. This allows for continuous mixing and collision with the water below, further increasing the size of the flocs.

[0047] The inner rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe and the mixture formed by the inclined downwards from the pressure plate 714, causing multiple flocs in different motion states to collide and aggregate, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the first outlet 715 on the distribution pipe and the mixture formed by the inclined downwards from the pressure plate 714, and the mixture formed by the flocculant sprayed outwards from the second outlet 313, causing flocs in different motion states to collide and aggregate, accelerating the growth of the flocs and improving the radial aggregation effect of the flocs throughout the circumference.

[0048] The inner rings of the convex and concave annular fluids formed by the outer blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe, the mixture formed by the downwardly tilted water pressure plate 714, and the mixture formed by the inner blades (including the outward spray from the second outlet 313 on the inner blades). This causes multiple flocs in different motion states to collide and agglomerate, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the outer blades mix and collide with the mixture formed by the flocculant sprayed downwards from the first outlet 715 on the distribution pipe, the mixture formed by the downwardly tilted water pressure plate 714, and the mixture formed by the flocculant sprayed outwards from the second outlet 313. This causes flocs in different motion states to collide and agglomerate, accelerating the growth of the flocs and improving the radial agglomeration effect of the flocs throughout the entire circumference.

[0049] The integrated wastewater treatment method provided in this preferred embodiment specifically includes: Start drive unit 1, and the impeller assembly rotates in the flocculation tank to stir and mix the water.

[0050] When the metering pump in the dosing device is started, flocculant under certain pressure enters the inner cavity of the lower part of the bearing 5 through the dosing pipe 6, then flows into the inner cavity of the drive shaft 2, and then enters the distribution pipe 713 through the drive shaft 2. Most of the flocculant enters the cavity of each blade of the outer impeller assembly 3 and the inner impeller assembly 4, and a small portion of the flocculant flows out downwards and obliquely downwards through the first outlet hole 715.

[0051] As the flocculant is sprayed downwards and at an angle from the first outlet 715 at different axial positions in the distribution pipe, it moves in a parabolic motion in the direction of rotation and downwards under the action of centrifugal force, continuously mixing with the water below, in front, and behind. It mixes with water bodies of different radii and heights, causing the flocs to grow continuously in the curved motion, thus achieving a three-dimensional floc growth process.

[0052] During rotation, the second discharge holes 313 on all the blades of the outer blade assembly 3 and the inner blade assembly 4 tilt outward to spray flocculant, which mixes with the surrounding water to form a mixture with smaller flocs, effectively increasing the movement path of the flocs and causing the flocs to continuously increase in size during movement.

[0053] The convex and concave sub-blades on each blade form convex and concave annular fluids with the drive shaft as the axis, and are connected end to end to form a sinusoidal rotating fluid from top to bottom with the drive shaft 2 as the axis.

[0054] The blades in the outer impeller assembly 3 and the inner impeller assembly 4 are set with different initial phase angles, so that the flocs in the mixture alternately mix and collide at a certain height at different radii, thereby making the flocs continuously increase in size.

[0055] The three sets of outer blades create alternating fluid widths, resulting in alternating stirring and mixing ranges, which enhances the mixing and flocculation effect between the outer and inner rings. The fluids of different widths mix alternately in the circumferential and radial directions, causing the flocs to continuously collide and grow in both directions, further improving floc growth.

[0056] The fluid width formed by the three sets of blades changes alternately, and the stirring and mixing range also changes alternately. Fluids of different widths mix alternately in the circumferential and radial directions, causing the flocs to collide and grow continuously in the circumferential and radial directions, further improving the growth of the flocs.

[0057] The fluid widths formed by the inner and outer blades change in opposite directions, and the sinusoidal fluids with different heights, radii, and widths effectively enhance and balance the mixing and flocculation effects in the space.

[0058] The combination of blades with different widths and phase angles on the inner and outer sides of the same circumference enhances the radial mixing and collision effect of flocs, effectively balancing the flocculation effect of radial mixing in different circumferential directions.

[0059] Several convex and concave annular fluids are sinusoidally unstable and spaced apart in the height direction, which greatly improves the flow performance in the depth direction and effectively enhances the agglomeration effect of flocs in the space outside the blade shaft rotation range.

[0060] In a certain circumferential direction, the most unstable convex or concave annular fluid at the uppermost end of the inner blades moves downward and mixes with the water below due to the downward and inclined spraying of flocculant from the first outlet. Similarly, the most unstable convex or concave annular fluid at the uppermost end of the outer blades moves downward and mixes with the water below due to the downward and inclined spraying of flocculant from the first outlet. Simultaneously, the flocculant mixture sprayed outward from the second outlet on the inner blades impacts and breaks down the convex or concave annular fluid formed by the outer blades, accelerating its downward movement and mixing with the water below, further increasing the floc size. This increased floc size then mixes again with the unstable concave or convex annular fluid below and the downward-moving fluid above, effectively enhancing the increase in floc size in the height direction… and so on, continuously enhancing the increase in floc size in the height direction.

[0061] Some of the denser and larger flocs move downwards, constantly colliding, mixing, and growing with the less dense flocs below, so as to effectively balance the flocs in the height direction in the flocculation tank.

[0062] The outward and inward diffusion effects of convex and concave annular fluids differ at different heights, which enhances the turbulence effect of the convex and concave annular fluids, thereby accelerating the three-dimensional mixing and aggregation of flocs.

[0063] The inner rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe and the mixture formed by the inclined downwards from the pressure plate 714. Multiple flocs in different motion states collide and agglomerate, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the first outlet 715 on the distribution pipe and the mixture formed by the inclined downwards from the pressure plate 714. At the same time, they mix and collide with the mixture formed by the flocculant sprayed outwards from the second outlet 313. This causes the flocs in different motion states to collide and agglomerate, accelerating the growth of the flocs and improving the radial agglomeration effect of the flocs throughout the entire circumference.

[0064] The inner rings of the convex and concave annular fluids formed by the outer blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe, the mixture formed by the downwardly tilted water pressure plate 714, and the mixture formed by the inner blades (including the outward spray from the second outlet hole 313 on the inner blades). Multiple streams of flocs in different motion states collide and agglomerate, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the outer blades mix and collide with the mixture formed by the flocculant sprayed downwards from the first outlet hole 715 on the distribution pipe, the downwardly tilted water pressure plate 714, and the outward spray from the second outlet hole 313. This causes the flocs in different motion states to collide and agglomerate, accelerating floc growth and improving the radial agglomeration effect of the flocs throughout the entire circumference.

[0065] Within each cycle in the height direction, the rotating fluids formed by the convex and concave sub-blades on the inner blades in the same circumferential direction are either 2π / 3 ahead or lag behind the rotating fluids formed by the convex and concave blades on the outer blades. Their flow patterns differ in both the radial and height directions, resulting in a certain interaction between the fluids formed by the inner and outer blades in space. This causes the flocs to continuously collide and aggregate in the radial and circumferential directions at different heights, accelerating floc growth. The mixture formed with the flocculant from the first outlet 715, which is rotated and sprayed, produces fluids with different floc contents at different heights, radial directions, and circumferential directions. This further intensifies the continuous collision and aggregation of the flocs, accelerating their growth again. Due to the phase difference between the first outer blade and the adjacent second and third outer blades, and the phase difference between the first inner blade and the adjacent second and third inner blades, as well as the phase difference between the inner and outer blades in the same circumferential direction, the fluids formed by the inner and outer blades with different phase differences also continuously collide and aggregate in the radial and circumferential directions at different heights, further increasing the floc size.

[0066] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An integrated wastewater treatment method with enhanced flocculation process, characterized in that, A flocculation device is used, which includes a drive shaft (2) and an impeller assembly. The impeller assembly includes an outer impeller assembly (3) and an inner impeller assembly (4). The outer impeller assembly (3) includes three sets of outer blades evenly arranged around the drive shaft (2). Each set of outer blades includes two outer blades symmetrically arranged around the drive shaft axis. The vertical cross section of the outer blades is a surface composed of two parallel sine curves. The inner impeller assembly (4) includes three sets of inner blades evenly arranged around the drive shaft (2). Each set of inner blades includes two inner blades symmetrically arranged around the drive shaft axis. The vertical cross section of the inner blades is a surface composed of two parallel sine curves. The integrated wastewater treatment method includes the following steps: Step 10: Start the drive unit (1), and the impeller assembly rotates in the flocculation tank to stir and mix the water; Step 20: The first outlet holes (715) at different axial positions of the distribution pipe (713) spray flocculant downward and at an angle downward. Under the action of centrifugal force, the flocculant moves in a parabolic motion in the direction of rotation and downward, continuously mixing with the water below, in front, and behind. It mixes with water bodies of different radii and heights, causing the flocs to grow continuously in the curved motion, realizing a three-dimensional floc enlargement process. The second outlet holes (313) on all blades of the outer impeller assembly (3) and the inner impeller assembly (4) spray flocculant at an angle outward during rotation, mixing with the surrounding water to form a mixed liquid. Step 30: In each blade, the convex blade forms a convex annular fluid with the drive shaft as the axis, and the concave blade forms a concave annular fluid with the drive shaft as the axis. The convex and concave annular fluids are connected end to end from top to bottom, forming a sinusoidal rotating fluid with the drive shaft (2) as the axis. The convex and concave annular fluids have different diffusion effects at different heights, which enhances the turbulence effect and thus accelerates the three-dimensional mixing and aggregation of flocs. The unstable rotating fluid improves the flow performance in the depth direction and effectively enhances the spatial aggregation effect of flocs inside and outside the rotation range of the blade shaft. Step 40: In a certain circumferential direction, the most unstable convex or concave annular fluid at the uppermost end of the inner blades, under the action of the mixture formed by the downward and obliquely downward spraying of flocculant from the first outlet, moves downward and mixes with the water below; the most unstable convex or concave annular fluid at the uppermost end of the outer blades, under the action of the mixture formed by the downward and obliquely downward spraying of flocculant from the first outlet, moves downward and mixes with the water below; simultaneously, due to the outward spraying of the mixture formed by flocculant from the second outlet on the inner blades, the mixture impacts and breaks down the outer blades. The convex or concave annular fluid accelerates its downward movement and mixes with the water below, causing the flocs to grow larger. The enlarged flocs then mix again with the unstable concave or convex annular fluid below and the downward-moving convex or concave annular fluid above, effectively enhancing the growth of the flocs in the height direction. This process continuously enhances the growth of the flocs in the height direction. Some flocs with higher density and volume move downward and continuously collide, mix, and grow with the lower-density flocs below, thus effectively balancing the flocs in the height direction in the flocculation tank. Step 50: The inner rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe and the mixture formed by the water pressure plate (714) tilted downwards. The three flocs in different motion states collide and agglomerate with each other, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the inner blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe and the mixture formed by the water pressure plate (714) tilted downwards. They also mix and collide with the mixture formed by the flocculant sprayed outwards from the second outlet hole (313), causing the flocs in different motion states to collide and agglomerate with each other, accelerating the growth of the flocs and improving the radial agglomeration effect of the flocs throughout the circumference. The inner rings of the convex and concave annular fluids formed by the outer blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe, the mixture formed by the water pressure plate (714) tilted downwards, and the mixture formed by the inner blades. Multiple flocs in different motion states collide and agglomerate with each other, accelerating the three-dimensional growth of the flocs. The outer rings of the convex and concave annular fluids formed by the outer blades mix and collide with the mixture formed by the flocculant sprayed downwards from the distribution pipe, the mixture formed by the water pressure plate (714) tilted downwards, and the mixture formed by the flocculant sprayed outwards from the second outlet hole (313). This causes the flocs in different motion states to collide and agglomerate with each other, accelerating the growth of the flocs and improving the radial agglomeration effect of the flocs throughout the entire circumference.

2. The integrated wastewater treatment method according to claim 1, characterized in that, Also includes: Step 60: The outer blades of the three sets of outer blades are set with different initial phase angles, so that the flocs at different radii on the same horizontal plane of the outer ring mixture alternately mix and collide, thereby making the flocs continuously increase in size; The inner blades of the three sets of inner blades are set with different initial phase angles, so that the flocs at different radii on the same horizontal plane of the inner ring mixture alternately mix and collide, thereby making the flocs continuously increase in size.

3. The integrated wastewater treatment method according to claim 1, characterized in that, Also includes: Step 70: The fluid width formed by the three sets of outer blades changes alternately, and the stirring and mixing range also changes alternately, which enhances the mixing and flocculation effect inside and outside the outer ring. Fluids of different widths are mixed alternately in the circumferential and radial directions, causing the flocs to collide and grow continuously in the circumferential and radial directions, further improving the growth of the flocs; The alternating widths of the fluids formed by the three sets of inner blades, along with the alternating ranges of stirring and mixing, enhance the mixing and flocculation effect between the inner and outer rings. The alternating mixing of fluids of different widths in the circumferential and radial directions causes the flocs to continuously collide and increase in size in both directions, further improving floc growth.

4. The integrated wastewater treatment method according to claim 3, characterized in that, Step 70 further includes: The inner and outer blade groups form fluid widths that change in opposite directions. The sinusoidal fluids with different heights, radii, and widths effectively enhance and balance the mixing and flocculation effects in the space.

5. The integrated wastewater treatment method according to claim 2, characterized in that, Also includes: In step 80, within each cycle in the height direction, the rotating fluid formed by the convex and concave sub-blades of the inner blade in the same circumferential direction is 2π / 3 ahead or behind the rotating fluid formed by the convex and concave sub-blades of the outer blade. The flow states are different in the radial and height directions. Therefore, the fluids formed by the inner and outer blades have a certain interaction in space, causing the flocs to continuously collide and aggregate in the radial and circumferential directions at different heights, thus accelerating the growth of the flocs. The mixture formed by the rotating injection of flocculant from the first outlet (715) forms fluids with different floc contents at different heights, in different radial directions, and in different circumferential directions, which strengthens the continuous collision and aggregation of the flocs and further accelerates the growth of the flocs. Since there is a phase difference between the first outer blade and the adjacent second and third outer blades, and a phase difference between the first inner blade and the adjacent second and third inner blades, and a phase difference between the inner and outer blades in the same circumferential direction, the fluids formed by the inner and outer blades with different phase differences also continuously collide and aggregate in the radial and circumferential directions at different heights, thus further increasing the size of the flocs.

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