Micro-flocculation sedimentation treatment device

Abstract

The invention discloses a micro-flocculation sedimentation treatment device which comprises a flocculation reaction section, a water inlet section, a water outlet section and a water outlet section, wherein the water inlet end of the flocculation reaction section is provided with a flow state adjusting mechanism; the transition channel is communicated with an outlet of the flocculation reaction section, and the tail end of the transition channel is connected with a precipitation separation section; the collecting structure is arranged at the bottom of the precipitation separation section; and the return pipeline is communicated with the collecting structure and the water inlet end of the flocculation reaction section. The flocculation flow state is optimized through the waveform surface of the spiral guide structure and the gradual change groove design, efficient floc polymerization is achieved in combination with an annular protrusion of a transition channel, and flow state self-adjustment and efficient substance separation are achieved under the condition that no external power exists.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a micro-flocculation sedimentation treatment device. Background Art

[0002] The micro-flocculation sedimentation process improves the efficiency of sedimentation and filtration by adding flocculants to aggregate fine particles in water into larger flocs. This process can adapt to different water quality conditions, including low-temperature and low-turbidity water, which often faces problems such as slow hydrolysis of coagulants and high viscous shear force during the coagulation process, while the micro-flocculation sedimentation process can effectively treat such water quality. At the same time, the micro-flocculation direct filtration process omits the coagulation sedimentation step, and the coagulation process is completely carried out in the filter bed, which can save the floor area of the water purification plant, reduce the project investment and water production cost. Conducting research on the micro-flocculation sedimentation treatment process is of great significance for improving water treatment efficiency, reducing costs, saving space, and enhancing water quality.

[0003] Therefore, in response to the above problems, some solutions have been proposed in the industry. For example, "a micro-sand flocculation sedimentation tank" disclosed in the Chinese patent literature, with the publication number "CN219185924U", includes a tank body, and also includes a first high-speed stirrer, a second high-speed stirrer, a slow stirrer, a sludge scraper, inclined tubes, a hydrocyclone, a micro-sand return pipe, and a centrifugal pump; diversion grooves are fixed on both the first high-speed stirrer and the slow stirrer, and a plurality of diversion holes are arranged at equal intervals along the circumferential direction on the outer wall of the diversion groove.

[0004] In the above solution, through the provided diversion grooves, the chemicals can be thrown in different directions under centrifugal force, improving the sufficiency and efficiency of the mixing of the chemicals and the raw water, reducing the waiting time, and improving the efficiency of sewage treatment; the equipment introduces an anti-flushing system, pumping part of the discharged water into the inclined tube sedimentation tank to wash the inclined tubes and the sludge scraper blades to a certain extent, ensuring the reliability of the equipment operation, and additionally reducing the later maintenance difficulty and cost; however, this solution still fails to solve the problems of high fragmentation degree of flocs during the transmission process and low flocculation efficiency. Summary of the Invention

[0005] In view of the problems of high fragmentation degree of flocs during the transmission process and low flocculation efficiency mentioned above, the present invention provides a micro-flocculation sedimentation treatment device, which optimizes the flocculation flow pattern through the waveform surface and gradient grooves of the spiral guiding structure, combines the annular protrusions of the transition channel to achieve efficient aggregation of flocs, and realizes self-regulation of the flow pattern and efficient separation of substances without external power.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A micro - flocculation precipitation treatment device, comprising: a flocculation reaction section, at the water inlet end of which there is a flow state regulating mechanism; a transition channel communicated with the outlet of the flocculation reaction section, and the end of this transition channel is connected with a precipitation separation section; a collection structure arranged at the bottom of the precipitation separation section; and a reflux pipeline connecting the collection structure and the water inlet end of the flocculation reaction section.

[0007] The device conducts primary flow state reforming on the incoming water through the flow state regulating mechanism at the water inlet end of the flocculation reaction section. The corrugated inner wall of the spiral guiding structure induces the water flow to generate a three - dimensional spiral motion, promoting full contact between the flocculant and pollutants. The annular protruding structure of the transition channel forms a flow velocity stratification in the middle section of the channel. The high - speed water flow on the outside and the vortex area on the inside cooperate to extend the floc collision and aggregation time. The alternately arranged guide vane groups in the precipitation separation section force the water flow to continuously turn, and flocs of different particle sizes achieve gradient sedimentation during the lateral velocity oscillation, with the coarse particles preferentially settling to the bottom collection structure.

[0008] Preferably, the flow state regulating mechanism includes a spiral guiding structure extending along the water flow direction, and the inner wall of this spiral guiding structure forms a continuously undulating corrugated surface.

[0009] Preferably, the cross - sectional shape of the transition channel changes continuously along the water flow direction, and forms an annular structure protruding towards the center of the channel in the middle section of the transition channel.

[0010] Preferably, a first guide vane group and a second guide vane group are arranged in the precipitation separation section. The inclination direction of the first guide vane group is opposite to that of the second guide vane group, and the two groups of guide vanes are alternately arranged.

[0011] Preferably, the corrugated surface is provided with grooves extending along the spiral direction, and the groove depth gradually decreases from the water inlet end to the water outlet end.

[0012] Preferably, a coarse sieve layer and a fine sieve layer arranged in a stacked manner are provided in the collection structure. The sieve hole sizes of the coarse sieve layer and the fine sieve layer are different and the inclination directions are opposite, and the inclination angle of the coarse sieve layer is greater than that of the fine sieve layer.

[0013] Preferably, a horizontally rotatable composite filter layer is provided at the top of the precipitation separation section. This filter layer is composed of a lower - layer metal wire mesh and an upper - layer ultra - filtration membrane in combination. A gap is formed between the metal wire mesh and the ultra - filtration membrane, and the ultra - filtration membrane surface is provided with continuous protruding structures extending along the rotation direction.

[0014] Preferably, the rotation axis of the composite filter layer deviates from the center line of the precipitation separation section, and the gap thickness between the metal wire mesh and the ultra - filtration membrane gradually changes along the rotation direction.

[0015] Preferably, the inner wall of the reflux pipeline is provided with alternately arranged guide vane groups. The guide vanes extend in a wavy shape along the water flow direction, and the wave crests and wave troughs of adjacent guide vanes are staggeredly distributed.

[0016] Preferably, the corrugated surface is covered with a microporous ceramic layer, the micropore diameter gradually decreases along the water flow direction, and the outer surface of the ceramic layer is consistent with the corrugated profile of the spiral guiding structure.

[0017] Therefore, the present invention has the following beneficial effects: The waveform design on the inner wall of the spiral guiding structure, combined with the gradually shallower grooves, forms water flow disturbances in multiple directions, enabling the flocculant to fully contact the pollutants, reducing the damage to the flocs caused by mechanical agitation, and improving the flocculation efficiency.

[0018] The alternately inclined deflector plate group and the variable cross-section channel cooperate with each other to extend the sedimentation path of the flocs by changing the water flow direction, and at the same time optimize the flow velocity distribution, enhance the sedimentation effect without additional energy consumption.

[0019] The eccentric design of the rotating filter layer, combined with the gradually changing gap structure, generates a dynamic shearing effect during filtration. Combined with the double-layer reverse screen layout, it realizes the efficient recovery of fine sand and self-cleaning of membrane fouling, reducing the maintenance cost.

[0020] The pipeline deflector plate matches the floc characteristics with the gradient characteristics of the ceramic layer, reduces the chemical agent consumption and prevents sediment attachment through structural self-regulation, and ensures the stability of the long-term operation of the system. Description of the Drawings

[0021] Figure 1 It is a top view of the present invention.

[0022] Figure 2 is Figure 1 the sectional view taken along A-A in

[0023] Figure 3 It is a schematic structural view of the transition channel in Embodiment 1.

[0024] Figure 4 It is a schematic structural view of the composite filter layer in Embodiment 2.

[0025] In the figure: 1 - flocculation reaction section, 2 - spiral guiding structure, 3 - corrugated surface, 31 - groove, 4 - transition channel, 5 - sedimentation separation section, 51 - first deflector plate group, 52 - second deflector plate group, 6 - collection structure, 61 - coarse sieve layer, 62 - fine sieve layer, 7 - composite filter layer, 71 - metal wire mesh, 72 - ultrafiltration membrane, 73 - convex structure, 74 - rotation axis, 75 - drive motor, 8 - return pipeline, 81 - deflector plate. Detailed Embodiments

[0026] The following further describes the present invention in conjunction with the drawings and specific embodiments. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end.

[0027] Example 1 As Figure 1 and 3 shown, a micro - flocculation precipitation treatment device includes: a flocculation reaction section 1, with a flow state adjustment mechanism provided at its water inlet end; a transition channel 4 connected to the outlet of the flocculation reaction section 1, and the end of this transition channel 4 is connected to a sedimentation separation section 5; a collection structure 6 provided at the bottom of the sedimentation separation section 5; and a reflux pipeline 8 connecting the collection structure 6 and the water inlet end of the flocculation reaction section 1. The flow state adjustment mechanism includes a spiral guiding structure 2 extending along the water flow direction, and the inner wall of this spiral guiding structure 2 forms a continuously undulating waveform surface 3. The waveform surface 3 is provided with grooves 31 extending along the spiral direction, and the depth of the grooves 31 gradually decreases from the water inlet end to the water outlet end.

[0028] As Figure 2 shown, the cross - sectional shape of the transition channel 4 changes continuously along the water flow direction, and a ring - shaped structure protruding towards the center of the channel is formed in the middle section of the transition channel 4. The sedimentation separation section 5 is provided with a first deflector plate group 51 and a second deflector plate group 52, and the inclination directions of the first deflector plate group 51 and the second deflector plate group 52 are opposite, and the two groups of deflector plates are arranged alternately.

[0029] The collection structure 6 is provided with a coarse sieve layer 61 and a fine sieve layer 62 arranged in a stacked manner. The sieve hole sizes of the coarse sieve layer 61 and the fine sieve layer 62 are different and the inclination directions are opposite, and the inclination angle of the coarse sieve layer 61 is greater than that of the fine sieve layer 62. The inner wall of the reflux pipeline 8 is provided with a staggered deflector plate group, and the deflector plates extend in a wavy shape along the water flow direction, and the wave crests and wave troughs of adjacent deflector plates are distributed in a staggered manner. The waveform surface 3 is covered with a microporous ceramic layer, the micropore diameter gradually decreases along the water flow direction, and the outer surface of the ceramic layer is consistent with the waveform contour of the spiral guiding structure 2.

[0030] The device realizes the flow state control and material separation of the micro-flocculation precipitation process through the cooperation of specific structures. In the flow state regulating mechanism arranged at the water inlet end, the spiral guiding structure 2 extends along the water flow direction, and its inner wall presents a continuously undulating waveform surface 3, which is covered with a microporous ceramic layer, and the outer contour of the ceramic layer fits exactly with the waveform of the spiral guiding structure 2. The grooves 31 formed on the waveform surface 3 extend along the spiral direction, and the depth of the grooves 31 gradually decreases from the water inlet end to the water outlet end, forming a gradually changing channel from deep to shallow. The transition channel 4 connects the flocculation reaction section 1 and the precipitation separation section 5. A ring-shaped structure protruding towards the center is arranged in the middle section of the channel. The ring-shaped object is continuously distributed along the circumferential direction of the channel, and its radial protruding height is adapted to the cross-sectional size of the channel, forming a local contraction area in the channel. Two groups of guide plates are arranged inside the precipitation separation section 5. The first guide plate group 51 and the second guide plate group 52 have opposite inclination directions. The two groups of guide plates are fixed to the side wall of the precipitation section in an alternating arrangement, and a zigzag flow channel is formed between adjacent guide plates. The collection structure 6 is located at the bottom of the precipitation section, and a coarse sieve layer 61 and a fine sieve layer 62 are arranged in layers inside. The sieve holes of the coarse sieve layer 61 are larger and are installed at a larger inclination angle. The fine sieve layer 62 is located downstream of the coarse sieve layer 61 and is inclined in the opposite direction at a smaller inclination angle, and the two sieve surfaces form a V-shaped material channel. The inner wall of the return pipeline 8 is fixedly installed with a guide plate group. The guide plates extend in a wavy shape along the water flow direction, and the wave crests and wave troughs of adjacent guide plates are misaligned, forming a flow channel disturbance structure arranged in a staggered manner.

[0031] The waveform surface 3 of the spiral guiding structure 2 forms periodic undulations in the axial direction. When water flows through, it is restricted by the waveform wall surface to generate a radial velocity component, which together with the spiral direction induces a three-dimensional spiral flow field. The pores on the surface of the microporous ceramic layer gradually shrink along the water flow direction. The larger pores at the water inlet end promote the rapid diffusion of the flocculant, and the smaller pores at the water outlet end reduce the fluid shear force to protect the floc structure. The gradual change in the depth of the grooves 31 forms an axial pressure gradient. The deeper grooves 31 at the water inlet end enhance the initial mixing intensity, and the shallow grooves 31 at the water outlet end maintain the stability of the flocs. The ring-shaped protrusion in the transition channel 4 forms a local acceleration area in the middle section of the channel. When the water flow passes through the ring-shaped structure, the outer flow velocity increases, and a low-speed vortex area is generated inside, promoting the collision and aggregation of flocs with different particle sizes. The zigzag flow channels formed by the alternating guide plate groups force the water flow to continuously change direction. The opposite inclination directions of adjacent guide plates generate transverse velocity oscillations, extending the sedimentation path of the flocs while destroying the laminar boundary layer. The large inclination angle design of the coarse sieve layer 61 enables large-particle micro-sand to quickly slide to the collection area. The reverse inclination of the fine sieve layer 62 prolongs the screening time of small particles. The difference in the inclination directions of the two sieve surfaces forms a self-cleaning effect. During the screening process, the material rolls under the action of gravity and the drag force of the water flow, reducing the blockage of the sieve holes. The wavy extension path and the misaligned distribution characteristics of the guide plates in the return pipeline 8 form alternating lift and resistance areas near the pipe wall, prompting the micro-sand particles to maintain a suspended transportation state and avoiding the accumulation of sediments at the bottom of the pipe.

[0032] The structural system disclosed in this embodiment achieves functional synergy through the inherent association of several geometric features. The spiral-guided corrugated surface 3 and the annular structure of the transition channel 4 jointly optimize the flow field distribution in the flocculation stage, the alternating guide plates and the double-layer screen mesh synergistically improve the sedimentation separation efficiency, and the layout of the guide plates in the return pipe 8 ensures the circulation stability of the system. The pore gradient change of the microporous ceramic layer on the corrugated surface 3 and the gradual change of the depth of the groove 31 form a dual control mechanism, which not only strengthens the dispersion of the flocculant but also avoids excessive shearing. Possible alternative implementation schemes include: the waveform period of the spiral guide structure 2 can be adjusted to a non-equidistant distribution to adapt to different water quality conditions; the amplitude and wavelength ratio of the wave extension of the guide plate can be adjusted according to the pipe diameter size; the difference in the inclination angle of the screen surface can be varied within a specific range. The overall structure of the device is compact, and each component realizes unpowered self-regulation through the precise matching of the geometric features of the flow channel. Compared with the traditional process, it reduces mechanical stirring and backwashing equipment, and significantly reduces energy consumption and maintenance costs while maintaining treatment efficiency.

[0033] When the device in this embodiment is in operation, the water to be treated enters from the water inlet end of the flocculation reaction section 1, and is guided by the corrugated surface 3 and the groove 31 to form a spiral propulsion motion when flowing through the spiral guide structure 2. The water flow generates a composite flow of radial diffusion and axial propulsion in the spiral flow channel, and the pores on the surface of the microporous ceramic layer are reduced along the way, which makes the flocculant release rate match the floc growth stage. The annular protrusions of the transition channel 4 accelerate the outer side of the water flow and form a vortex zone on the inner side during operation. The shearing effect between layers with different flow rates promotes the collision and aggregation of fine flocs. After entering the sedimentation and separation section 5, the alternating guide plates force the water flow to be continuously turned, and the flocs migrate to the bottom of the sedimentation area under the action of lateral velocity oscillation. The coarse particles are preferentially settled and captured by the collection structure 6. When the double-layer screen is in operation, the coarse screen layer 61 intercepts large-particle micro-sand and achieves rapid sliding with the help of the inclination angle. The fine screen layer 62 extends the screening time by reverse inclination. The V-shaped channel formed between the screen surfaces produces a material tumbling effect, and the screening residues are washed off with the reverse water flow. The wave-shaped extension structure of the guide plate in the return pipe 8 induces alternating vortices when the fluid passes through, and the micro-sand particles are kept in suspension by the periodic lift force, forming a stable gas-liquid-solid three-phase flow along the pipe.

[0034] Furthermore, the waveform period of the spiral guide structure 2 can be adjusted according to the turbidity of the inlet water, and a longer waveform period is used for high turbidity water bodies to reduce flow resistance. The wave extension path of the guide plate can be changed to a progressive amplitude change, with a larger amplitude on the inlet side to enhance the initial disturbance, and a gradually decreasing amplitude on the outlet side to maintain flow stability. The screen material can be replaced with a polyurethane elastic screen plate, which can adapt to the blockage of the screen holes by using its deformation characteristics, but the strength of the screen layer support structure needs to be adjusted accordingly. The pore gradient design of the microporous ceramic layer can be changed to an axial segmented type, and a high porosity section is set in the area corresponding to the flocculant addition point to enhance initial mixing.

[0035] In practical applications, the water plant needs to adjust the installation position of the annular protrusions in the transition channel 4 according to the suspended solid concentration of the raw water. For high-concentration water bodies, the protrusions are shifted towards the water inlet side of the channel to enhance the collision of flocs in the early stage. The spacing of the baffle plates in the sedimentation section is dynamically adjusted according to the treatment volume. The spacing is enlarged under large flow conditions to reduce the pressure loss, and the spacing is reduced under small flow conditions to improve the separation accuracy. The cleaning cycle of the sieve layer needs to be determined in combination with the monitoring data of the micro-sand recovery rate. When the screening efficiency of the fine sieve layer 62 decreases by 10%, the backwashing procedure is started. The baffle plates in the reflux pipeline 8 need to be regularly inspected for surface attachments, and high-pressure water guns can be used to wash axially along the wavy contour to effectively remove scale. For the treatment of oily wastewater, a pre-oxidation unit needs to be added in front of the spiral guiding structure 2 to prevent oil films from adhering to the pores of the ceramic layer. This structural system realizes rapid assembly through modular design. When the water plant is renovated, the main structure of the original sedimentation tank is retained, and the baffle plate group and the sieve mesh assembly are embedded in the existing tank body in a sliding rail manner, significantly reducing the renovation cost and construction period.

[0036] Example 2 As Figure 4 shown, in this embodiment, a micro-flocculation sedimentation treatment device is disclosed, including: a flocculation reaction section 1, with a flow state adjustment mechanism provided at its water inlet end; a transition channel 4 connected to the outlet of the flocculation reaction section 1, and the end of the transition channel 4 is connected to a sedimentation and separation section 5; a collection structure 6 provided at the bottom of the sedimentation and separation section 5; a reflux pipeline 8 connecting the collection structure 6 and the water inlet end of the flocculation reaction section 1. A horizontally rotatable composite filter layer 7 is provided at the top of the sedimentation and separation section 5. The filter layer is composed of a lower metal wire mesh 71 and an upper ultrafiltration membrane 72 laminated together. A gap is formed between the metal wire mesh 71 and the ultrafiltration membrane 72, and a continuous protrusion structure 73 extending along the rotation direction is provided on the surface of the ultrafiltration membrane 72. The rotation axis 74 of the composite filter layer 7 deviates from the center line of the sedimentation and separation section 5, and the gap thickness between the metal wire mesh 71 and the ultrafiltration membrane 72 gradually changes along the rotation direction.

[0037] This device is also provided with a composite filter layer 7, which realizes efficient filtration and self-cleaning functions through the dynamic structure of the composite filter layer 7. A horizontally rotatable composite filter layer 7 driven by a driving motor 75 is installed at the top of the sedimentation and separation section 5. It is composed of a lower metal wire mesh 71 and an upper ultrafiltration membrane 72 laminated together. The mesh size of the metal wire mesh 71 is significantly larger than the pore size of the ultrafiltration membrane 72, and a wedge-shaped gap is formed between the two filter media. A continuous protrusion structure 73 extending along the rotation direction is processed on the surface of the ultrafiltration membrane 72. The cross-section of the protrusion is trapezoidal, the width of the top surface is smaller than the bottom surface, and the side surface forms an inclined transition with the membrane plane. The rotation axis 74 of the composite filter layer 7 deviates from the center line of the sedimentation and separation section 5, and the offset distance is in a proportional relationship with the radius of the filter layer. The gap thickness between the metal wire mesh 71 and the ultrafiltration membrane 72 gradually decreases along the rotation direction, forming a progressive compression area at the edge of the filter layer.

[0038] The wire mesh 71 serves as the primary filtration medium, and its mesh size is designed to intercept large particle flocs and fine sand. The ultrafiltration membrane 72 is responsible for retaining fine suspended solids. The wedge-shaped gap between the two layers of media forms a dynamic pressure gradient during rotation. The thicker gap on the inlet side allows large particle substances to settle, and the gradually narrowing gap on the outlet side enhances the fluid shear effect. The trapezoidal protrusions on the surface of the ultrafiltration membrane 72 generate relative movement with the water flow during rotation. The inclination angle of the protrusion side matches the hydrodynamic characteristics, promoting the migration of intercepted pollutants towards the edge of the filter layer. The eccentric rotation of the filter layer results in differences in linear velocity in different regions. A higher flow velocity region is generated on the side offset from the center, enhancing the self-cleaning effect on the surface of the filter layer, and a low-velocity deposition region is formed on the opposite side to promote floc enrichment.

[0039] When installing the composite filter layer 7, it is necessary to ensure the uniformity of the interlayer gap between the wire mesh 71 and the ultrafiltration membrane 72. The change gradient of the gap thickness corresponds strictly to the rotation direction. The extension direction of the protrusion structure 73 forms a specific angle with the tangent direction of the filter layer rotation trajectory. The design of this angle needs to balance the shear force intensity and the flow resistance. The filter layer support frame adopts a radial rib structure, and the rib direction is consistent with the direction of the rotational centrifugal force to avoid structural deformation during high-speed rotation. A diversion channel is set at the end with the minimum thickness of the wedge-shaped gap to collect the peeled-off pollutants and discharge them from the system through centrifugal force.

[0040] During the operation of the device, the water body to be treated rises to the area of the composite filter layer 7 after being guided by the sedimentation separation section 5. The composite filter layer 7 rotates horizontally driven by the drive mechanism. The wire mesh 71 serves as the primary filtration medium to intercept larger particles, and the ultrafiltration membrane 72 further separates fine suspended solids. When the filter layer rotates, the gap thickness between the wire mesh 71 and the ultrafiltration membrane 72 gradually decreases along the rotation direction. The thicker gap on the inlet side allows some flocs to settle on the surface of the wire mesh 71, and the gradually thinner gap on the outlet side enhances the fluid shear effect to peel off the attached pollutants. The continuous protrusion structure 73 on the surface of the ultrafiltration membrane 72 generates relative movement with the water flow during rotation. The inclination angle of the protrusion side induces the intercepted substances to migrate towards the edge of the filter layer and finally be thrown away from the filtration area by centrifugal force.

[0041] The eccentric rotation of the filter layer results in differences in linear velocity in different regions. The region closer to the side offset from the rotation center has a higher linear velocity, forming a strong shear flow field to promote self-cleaning of the membrane surface; the linear velocity on the opposite side is lower, which is conducive to floc enrichment and subsequent discharge. The gradual change distribution of the gap thickness is dynamically matched with the rotation speed. When rotating at a high speed, the reduced gap enhances the filtration accuracy, and when rotating at a low speed, the enlarged gap reduces the pressure loss. The coarse particles intercepted by the wire mesh 71 slide along the mesh surface towards the collection tank under the action of rotational inertia, and the fine particles intercepted by the ultrafiltration membrane 72 move towards the edge under the guiding action of the protrusion structure 73 and are finally discharged from the system through the sewage discharge channel.

[0042] In actual operation, the user controls the filter layer rotation speed to match the inlet flow rate. Too high a rotation speed can easily lead to excessive shear force of the interstitial fluid and destroy the floc structure, while too low a rotation speed can reduce the self-cleaning efficiency. During installation, calibrate the angle between the offset direction of the filter layer rotation axis 74 and the water flow direction to ensure that the direction of centrifugal force is consistent with the migration path of pollutants. The gap thickness gradient is adjusted according to the treated water quality. A larger gradient difference is used in high turbidity water bodies to enhance the sewage discharge capacity, and a reduced gradient difference is used in low turbidity water bodies to reduce energy consumption. The extension direction of the raised structure 73 maintains a fixed angle with the rotation tangent direction. An installation error exceeding 5° will significantly weaken the guiding effect.

[0043] In actual application, sewage treatment plants need to adjust the filter layer offset according to seasonal water quality changes. In rainy season, high suspended solids conditions increase the offset distance to strengthen centrifugal sewage discharge, and in dry season, adjust the offset to save energy. The filter layer rotation speed is adjusted according to the proportion of the inlet flow rate. For every 20% increase in flow rate, the corresponding rotation speed increases by 15%-18%. The support frame needs to be checked for structural deformation every month, and a laser centering instrument is used to detect the horizontal deviation of the rotating plane. When it exceeds the permitted range, the drive shaft needs to be recalibrated. The ultrafiltration membrane 72 raised structure 73 is checked for wear every quarter, and the membrane assembly needs to be replaced when the wear depth of the edge area reaches 1 / 3 of the initial height. For wastewater containing more fiber impurities, a cyclone separator needs to be added upstream of the filter layer to prevent fibers from entangled in the metal wire mesh 71. This structure achieves continuous filtration through the synergistic effect of mechanical movement and fluid power, reducing the backwash water volume by more than 60% compared with traditional fixed filter tanks, and is suitable for upgrading and transformation of urban sewage treatment plants with limited land.

[0044] Example 3 Compared with Example 2, the device in this embodiment adopts an adjustable composite filter layer 7 structure to adapt to different water quality conditions. The composite filter layer 7 is connected by a metal mesh 71 and an ultrafiltration membrane 72 through discrete bonding points. The bonding points are regularly distributed, and a through channel is formed between adjacent points. A semicircular protrusion is provided on the surface of the ultrafiltration membrane 72. The height of the protrusion gradually increases from the center of the filter layer to the edge, and the direction of the protrusion is consistent with the rotation direction of the filter layer. The drive shaft is installed on a movable base, and the base is connected to the side wall of the sedimentation section through a slide rail. The extension direction of the slide rail forms an inclination angle with the radial direction of the sedimentation section. The offset of the filter layer rotation center is changed by adjusting the position of the base.

[0045] The discrete bonding of the wire mesh 71 and the ultrafiltration membrane 72 forms a support network, and the unbonded area forms a continuous gap, and the gap thickness is controlled by the distribution density of the bonding points. The arc surface of the semicircular protrusion forms a specific angle with the water flow direction, and uniform fluid disturbance is generated during rotation. When the drive shaft base moves along the inclined slide rail, the filter layer rotation plane changes angle synchronously, so that the linear speed difference in different areas can be adjusted. The support frame adopts a cross rib structure, the rib direction matches the force direction of the filter layer, and the intersection position corresponds to the distribution of bonding points.

[0046] During operation, the offset of the filter layer is adjusted by sliding the base. For high-turbidity water bodies, the rotation center is moved towards the edge of the sedimentation section to increase the linear velocity gradient and strengthen the surface shear effect. For low-turbidity conditions, it is adjusted back to a near-center position to reduce energy consumption. The channels formed by discrete bonding allow large flocculent particles to pass through the surface layer of the wire mesh 71, reducing the risk of blockage between layers. The gradually changing distribution of the protrusion height enhances the stripping of pollutants in the edge area, while maintaining a low flow resistance in the central area. The inclined design of the slide rail synchronously changes the inclination angle of the rotation plane when adjusting the offset of the filter layer, promoting the enrichment of intercepted substances in specific areas.

[0047] In this embodiment, dynamic adaptation is achieved through mechanical adjustment. Discrete bonding replaces traditional full-width bonding, improving the permeability of the gap, and significantly reducing the sediment accumulation on the surface layer of the wire mesh 71. The adjustable offset mechanism optimizes the working state of the filter layer according to water quality changes, maintaining stable water production during flow fluctuations. The cross rib support structure enhances the rigidity of the filter layer and prevents deformation during high-speed rotation. During actual application, it is necessary to regularly check the integrity of the bonding points, observe the change in the uniformity of the gap, and perform local repairs if necessary. This solution is applicable to scenarios with frequent water quality fluctuations. By replacing a complex control system with structural adjustment, it simplifies the operation process while ensuring the filtration accuracy.

Claims

1. A micro-flocculation precipitation treatment device, characterized in that Comprising: A flocculation reaction section, at the water inlet end of which there is a flow regime regulating mechanism; A transition channel communicating with the outlet of the flocculation reaction section, and a sedimentation separation section is connected to the end of the transition channel; A collection structure provided at the bottom of the sedimentation separation section; A reflux pipeline connecting the collection structure and the water inlet end of the flocculation reaction section.

2. The micro-flocculation sedimentation treatment device according to claim 1, wherein The flow regime regulating mechanism includes a spiral guiding structure extending along the water flow direction, and the inner wall of the spiral guiding structure forms a continuously undulating waveform surface.

3. The micro-flocculation sedimentation treatment device according to claim 1, characterized in that, The cross-sectional shape of the transition channel changes continuously along the water flow direction, and a ring-shaped structure protruding towards the center of the channel is formed in the middle section of the transition channel.

4. The micro-flocculation sedimentation treatment device according to claim 1, wherein A first guide vane group and a second guide vane group are provided in the sedimentation separation section. The inclination direction of the first guide vane group is opposite to that of the second guide vane group, and the two groups of guide vanes are arranged alternately.

5. The microflocculation sedimentation treatment device according to claim 2, characterized in that, The waveform surface is provided with grooves extending along the spiral direction, and the groove depth gradually decreases from the water inlet end to the water outlet end.

6. The micro-flocculation precipitation treatment device according to any one of claims 1-5, characterized in that, The collection structure is provided with a coarsening screen layer and a fine screening layer arranged in a stacked manner. The screen hole sizes of the coarsening screen layer and the fine screening layer are different and the inclination directions are opposite, and the inclination angle of the coarsening screen layer is greater than that of the fine screening layer.

7. The microflocculation sedimentation treatment device according to any one of claims 1-5, characterized in that A horizontally rotatable composite filter layer is provided at the top of the sedimentation separation section. The filter layer is composed of a lower metal wire mesh and an upper ultrafiltration membrane in combination. A gap is formed between the metal wire mesh and the ultrafiltration membrane, and a continuous convex structure extending along the rotation direction is provided on the surface of the ultrafiltration membrane.

8. The micro-flocculation sedimentation treatment device according to claim 7, characterized in that, The rotation axis of the composite filter layer deviates from the center line of the sedimentation separation section, and the gap thickness between the metal wire mesh and the ultrafiltration membrane changes gradually along the rotation direction.

9. The micro-flocculation precipitation treatment device according to any one of claims 1-5, characterized in that, The inner wall of the reflux pipeline is provided with a group of guide vanes arranged in a staggered manner. The guide vanes extend in a wavy shape along the water flow direction, and the wave crests and wave troughs of adjacent guide vanes are distributed in a staggered manner.

10. The micro-flocculation precipitation treatment device according to claim 2, wherein, The waveform surface is covered with a microporous ceramic layer, the micropore diameter gradually decreases along the water flow direction, and the outer surface of the ceramic layer is consistent with the waveform profile of the spiral guiding structure.

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