Annular grid flocculation precipitation device

Abstract

The utility model discloses an annular grid flocculation precipitation device, and relates to the technical field of drinking water treatment, an annular water distribution tank is arranged at the upper end of an outer cylinder and is communicated with the inside of the outer cylinder, a plurality of annular reaction tanks are positioned in the outer cylinder, a sludge treatment module is positioned at the lower ends of the annular reaction tanks, and the annular reaction tanks are sequentially sleeved; an inner ring of the annular separation area is mounted in the middle of the outer wall of the outermost annular reaction tank, an outer ring of the annular separation area is mounted in the middle of the inner wall of the outer cylinder, two ends of the annular separation area can be communicated with the inside of the outer cylinder, and a plurality of grid plates which are sequentially arranged in the vertical direction are mounted in each annular reaction tank; one end of the annular reaction tank located at the innermost layer is a raw water inlet, one end of the annular reaction tank located at the outermost layer is a mixed water outlet, and in the adjacent annular reaction tanks, water enters the annular reaction tank located at the outer layer from the annular reaction tank located at the inner layer. According to the utility model, the water treatment coagulation reaction is sufficient, and the precipitation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of drinking water treatment, in particular to an annular grid flocculation sedimentation device. Background Art

[0002] The existing coagulation sedimentation method can reduce the turbidity and chromaticity of wastewater, remove various macromolecular substances, organic substances and certain heavy metal poisons, etc., and is generally widely used in the field of wastewater treatment.

[0003] However, the current coagulation sedimentation method still has the disadvantages of large floor area and high energy consumption of mechanical stirring. Especially in the pretreatment of low-turbidity drinking water, there are still problems such as insufficient coagulation reaction, fine and light flocs generated, and difficult precipitation, which further leads to poor sedimentation effect and affects the subsequent advanced treatment. On the other hand, the current coagulation sedimentation method may have the problem of insufficient mixing of the added medicament and the raw water, resulting in waste of the medicament and affecting the treatment effect of the whole process. Summary of the Utility Model

[0004] The purpose of the utility model is to provide an annular grid flocculation sedimentation device to solve the problems existing in the above-mentioned prior art, make the coagulation reaction of water treatment sufficient, and improve the sedimentation effect.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides an annular grid flocculation sedimentation device, which includes an annular water distribution tank, an outer cylinder, an annular separation area, a sludge treatment module and a plurality of annular reaction tanks. The annular water distribution tank is installed at the upper end of the outer cylinder and is communicated with the inside of the outer cylinder. The plurality of annular reaction tanks are located inside the outer cylinder. The sludge treatment module is located at the lower end of the annular reaction tanks. The plurality of annular reaction tanks are sleeved in sequence. The inner ring of the annular separation area is installed in the middle of the outer wall of the outermost annular reaction tank. The outer ring of the annular separation area is installed in the middle of the inner wall of the outer cylinder, and both ends of the annular separation area can communicate with the inside of the outer cylinder. A plurality of grid plates arranged in sequence in the vertical direction are installed in each annular reaction tank. One end of the innermost annular reaction tank is the raw water inlet, and one end of the outermost annular reaction tank is the mixed water outlet. In adjacent annular reaction tanks, water enters the annular reaction tank located in the outer layer from the annular reaction tank located in the inner layer.

[0007] Preferably, the annular reaction tank is divided into a primary annular reaction tank and a secondary annular reaction tank. The primary annular reaction tank includes a number of primary grid shafts. One end of one of the primary grid shafts is the raw water inlet. Water sequentially enters each of the primary grid shafts, and the water flow directions in adjacent primary grid shafts are opposite. The secondary annular reaction tank includes a number of secondary grid shafts. The multiple secondary grid shafts are arranged in a ring and are disposed around the primary annular reaction tank. One end of one of the secondary grid shafts is the water inlet end of the secondary annular reaction tank. The water inlet end of the secondary annular reaction tank is communicated with the water outlet end of the primary annular reaction tank. Water sequentially enters each of the secondary grid shafts, and the water flow directions in adjacent secondary grid shafts are opposite. One end of another secondary grid shaft is the mixed water outlet.

[0008] Preferably, there are two primary grid shafts. The primary grid shaft where the raw water inlet is located is the primary grid water inlet shaft, and the other primary grid shaft is the primary grid water outlet shaft. The lower end of the primary grid water inlet shaft is communicated with one end of the water inlet pipe. The other end of the water inlet pipe is communicated with the raw water source, and a coagulant can be introduced into the water inlet pipe. The upper end of the primary grid water inlet shaft is communicated with the upper end of the primary grid water outlet shaft. The lower end of the primary grid water outlet shaft is communicated with the water inlet end of the secondary annular reaction tank. There are multiple secondary grid shafts. The secondary grid shaft where the water inlet end of the secondary annular reaction tank is located is the secondary grid water inlet shaft. The water inlet end of the secondary annular reaction tank is located at the upper end of the secondary grid water inlet shaft. The lower end of the secondary grid water inlet shaft is communicated with the lower end of an adjacent secondary grid shaft.

[0009] Preferably, the volumes of all the primary grid shafts are the same, and in the water flow direction, the diameters of the water passing openings of all the primary grid shafts gradually increase. The volumes of all the secondary grid shafts are the same, and in the water flow direction, the diameters of the water passing openings of all the secondary grid shafts gradually increase.

[0010] Preferably, all the primary grid shafts and all the secondary grid shafts can be detachably installed in the outer cylinder body, and all the grid plates can be detachably installed in the primary grid shaft or the secondary grid shaft.

[0011] Preferably, the annular separation zone includes a number of inclined plate packings. The multiple inclined plate packings are disposed around the outer periphery of the outermost annular reaction tank, and there are water passing gaps between adjacent inclined plate packings. Each inclined plate packing forms an angle with the horizontal plane.

[0012] Preferably, a ring-shaped sludge chamber is provided at a position corresponding to the lower end of the outermost ring-shaped reaction tank inside the outer cylinder body, and the mixed water outlet can communicate with the ring-shaped sludge chamber; a ring-shaped separation chamber is provided at a position corresponding to the lower end of the ring-shaped separation zone inside the outer cylinder body, the ring-shaped separation chamber is communicated with the ring-shaped sludge chamber, and the mixed water in the ring-shaped separation chamber can pass through the ring-shaped separation zone from bottom to top for sediment-water separation. The separated supernatant enters above the ring-shaped separation zone and reaches the water distribution tank, and the separated floc sludge falls to the bottom of the ring-shaped separation chamber.

[0013] Preferably, an outlet overflow weir is installed on the inner ring of the water distribution tank. The separated supernatant enters the water distribution tank through the outlet overflow weir, and a plurality of water separation plates are provided in the water distribution tank. The plurality of water separation plates are arranged circumferentially, and water outlet openings are provided between adjacent water separation plates. Each water outlet opening is respectively used to connect each reaction tank.

[0014] Preferably, the sludge treatment module includes a reflux element, a cleaning port, a first sludge discharge pipe, a main sludge discharge pipe, and a plurality of second sludge discharge pipes. A multi-hopper sludge discharge area is provided at the bottom of the ring-shaped separation chamber. A plurality of downwardly protruding sludge discharge grooves are provided on the inner bottom surface of the multi-hopper sludge discharge area. One end of each second sludge discharge pipe is respectively connected to the bottom of each sludge discharge groove. The other ends of the second sludge discharge pipes are all communicated with the main sludge discharge pipe. One end of the main sludge discharge pipe is communicated with the reflux element. The cleaning port is opened on the main sludge discharge pipe and is arranged close to the reflux element, and the cleaning port is used to externally connect an anti-washing device. Valves are provided at the cleaning port and each second sludge discharge pipe. A tee joint is provided on the first sludge discharge pipe. The first end of the tee joint is communicated with the reflux element. The second end of the tee joint is communicated with the lower end of the innermost ring-shaped reaction tank. A sludge discharge port is formed outside the third end of the tee joint. The reflux element can be adjusted by frequency conversion, and the reflux element can pass the floc sludge collected in the main sludge discharge pipe into the lower part of the innermost ring-shaped reaction tank through the first sludge discharge pipe, and make the floc sludge form a fixed suspension mud layer under the innermost ring-shaped reaction tank.

[0015] Preferably, the reflux element is a pump.

[0016] The utility model has achieved the following technical effects compared with the prior art:

[0017] 1. The ring-shaped grid flocculation and sedimentation device provided by the utility model realizes collecting the separated supernatant in the ring-shaped water distribution tank by installing the ring-shaped water distribution tank at the upper end of the outer cylinder body and communicating it with the inside of the outer cylinder body, and diverting the supernatant to the reaction tank through the ring-shaped water distribution tank for subsequent operations.

[0018] 2. The annular grid flocculation and sedimentation device provided by the present utility model arranges a plurality of annular reaction tanks inside the outer cylinder body, and makes the plurality of annular reaction tanks sleeved in sequence, so that water passes through each annular reaction tank from inside to outside in sequence. At the same time, a plurality of grid plates arranged in sequence along the vertical direction are installed in each annular reaction tank, so that the coagulant continuously collides when passing through each grid plate in each annular reaction tank, making the flocculation reaction achieve the best effect. Compared with the traditional mechanical stirring method, it can save energy consumption. And compared with the traditional pipeline mixer, the multi-stage annular reaction tank lengthens the flocculation reaction time and makes the reaction more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is the front view of the annular grid flocculation and sedimentation device in the present utility model;

[0021] Figure 2 It is the top view of the annular grid flocculation and sedimentation device in the present utility model;

[0022] Figure 3 It is the cross-sectional view of the annular grid flocculation and sedimentation device in the present utility model;

[0023] In the figure: 1 - outer cylinder body, 2 - annular separation area, 3 - secondary grid shaft, 4 - primary grid shaft, 5 - primary grid plate, 6 - secondary grid plate, 7 - effluent overflow weir, 8 - annular water distribution tank, 9 - multi-hopper sludge discharge area, 10 - second sludge discharge pipe, 11 - reflux element, 12 - cleaning port, 13 - water inlet pipe, 14 - first sludge discharge pipe, 15 - sludge discharge main pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0025] The purpose of the present utility model is to provide an annular grid flocculation and sedimentation device to solve the problems existing in the prior art, make the water treatment coagulation reaction sufficient, and improve the sedimentation effect.

[0026] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] As Figures 1 - 3 shown, this embodiment provides an annular grid flocculation sedimentation device, which includes an annular water distribution tank 8, an outer cylinder 1, an annular separation zone 2, a sludge treatment module, and a plurality of annular reaction tanks. The annular water distribution tank 8 is installed at the upper end of the outer cylinder 1 and is in communication with the inside of the outer cylinder 1, so as to collect the supernatant separated by the annular separation zone 2 into the annular water distribution tank 8, and divert the supernatant through the annular water distribution tank 8 into the reaction tank for subsequent operations. A plurality of annular reaction tanks are located inside the outer cylinder 1, and the sludge treatment module is located at the lower end of the annular reaction tank, so as to centrally collect and treat the precipitates such as floc sludge separated, effectively removing sediment, colloidal suspended matter, etc. in the water. The plurality of annular reaction tanks are sequentially sleeved. The inner ring of the annular separation zone 2 is installed in the middle of the outer wall of the outermost annular reaction tank, and the outer ring of the annular separation zone 2 is installed in the middle of the inner wall of the outer cylinder 1, and both ends of the annular separation zone 2 can communicate with the inside of the outer cylinder 1. A plurality of grid plates arranged in sequence in the vertical direction are installed in each annular reaction tank, and the number and aperture of the grid plates in each annular reaction tank are different. One end of the innermost annular reaction tank is the raw water inlet, and one end of the outermost annular reaction tank is the mixed water outlet. In adjacent annular reaction tanks, water enters the outer annular reaction tank from the inner annular reaction tank, so that when the coagulant passes through each grid plate in each annular reaction tank, collisions continuously occur, making the flocculation reaction reach the best effect, which can save energy compared with the traditional mechanical stirring method, and compared with the traditional pipe mixer, the multi-stage annular reaction tank lengthens the flocculation reaction time and makes the reaction more sufficient.

[0028] Specifically, the annular reaction tank is divided into a primary annular reaction tank and a secondary annular reaction tank, with two-stage reactions set up to lengthen the flocculation reaction time and make the reaction more complete. The primary annular reaction tank includes several primary grid shafts 4. One end of one of the primary grid shafts 4 is the raw water inlet. Water enters each of the primary grid shafts 4 in sequence, and the water flow directions in adjacent primary grid shafts 4 are opposite. The secondary annular reaction tank includes several secondary grid shafts 3. The multiple secondary grid shafts 3 are arranged in a ring and are set around the primary annular reaction tank. One end of one of the secondary grid shafts 3 is the water inlet end of the secondary annular reaction tank. The water inlet end of the secondary annular reaction tank is connected to the water outlet end of the primary annular reaction tank. Water enters each of the secondary grid shafts 3 in sequence, and the water flow directions in adjacent secondary grid shafts 3 are opposite. One end of another secondary grid shaft 3 is the mixed water outlet. Furthermore, the positions of the water passing openings (i.e., the water flow inlet openings) of each of the primary grid shafts 4 are staggered, and the positions of the water passing openings (i.e., the water flow inlet openings) of each of the secondary grid shafts 3 are staggered, so that the coagulant continuously collides within each of the primary grid shafts 4 and each of the secondary grid shafts 3, making the flocculation reaction achieve the best effect.

[0029] There are two primary grid shafts 4. The primary grid shaft 4 where the raw water inlet is located is the primary grid water inlet shaft, and the other primary grid shaft 4 is the primary grid water outlet shaft. The lower end of the primary grid water inlet shaft is connected to one end of the water inlet pipe 13. The other end of the water inlet pipe 13 is connected to the raw water source. A coagulant inlet is provided on the side wall of the water inlet pipe 13. Coagulant is introduced into the water inlet pipe 13 through the coagulant inlet. The upper end of the primary grid water inlet shaft is connected to the upper end of the primary grid water outlet shaft. The lower end of the primary grid water outlet shaft is connected to the water inlet end of the secondary annular reaction tank. After the mixed liquid of water and coagulant enters the primary grid water inlet shaft from the raw water inlet, it flows upward in the primary grid water inlet shaft and flows into the upper end of the primary grid water outlet shaft through the upper end of the primary grid water inlet shaft, and then flows downward in the primary grid water outlet shaft. During this process, the water, coagulant, and grid plate continuously collide and react fully, gradually forming alum flocs that are conducive to precipitation. There are multiple secondary grid shafts 3. The secondary grid shaft 3 where the water inlet end of the secondary annular reaction tank is located is the secondary grid water inlet shaft. The water inlet end of the secondary annular reaction tank is located at the upper end of the secondary grid water inlet shaft. The lower end of the secondary grid water inlet shaft is connected to the lower end of an adjacent secondary grid shaft 3. The mixed liquid of water and coagulant enters the lower end of the secondary grid water inlet shaft from the lower end of the primary grid water outlet shaft, then flows upward in the secondary grid water inlet shaft, and then enters an adjacent secondary grid shaft 3 from top to bottom, and so on, making the water flow directions in each of the secondary grid shafts 3 opposite. During this process, the water, coagulant, and grid plate continuously collide and react fully, gradually forming alum flocs that are conducive to precipitation. Among them, the grid plate in the primary grid shaft 4 is the primary grid plate 5, and the grid plate in the secondary grid shaft 3 is the secondary grid plate 6.

[0030] The volumes of all the first - level grid shafts 4 are the same, and in the water flow direction, the diameters of the water inlets of the first - level grid shafts 4 gradually increase; the volumes of all the second - level grid shafts 3 are the same, and in the water flow direction, the diameters of the water inlets of the second - level grid shafts 3 gradually increase. By adopting the setting method that the sizes of the water inlets gradually increase in the water flow direction, the water flow speeds in the first - level grid shafts 4 and the second - level grid shafts 3 can be controlled to gradually decrease, avoiding the influence of turbulent flow on the sedimentation effect of the subsequent flocs.

[0031] All the first - level grid shafts 4 and the second - level grid shafts 3 can be lifted and detachably installed in the outer cylinder 1. Each grid plate can be lifted and detachably installed in the first - level grid shaft 4 or the second - level grid shaft 3, and the grid plate can be flushed online at any time, avoiding the influence of grid plate fouling on water passing and further causing sewage overflow. Compared with the design of traditional grid flocculation tanks that need to be emptied for flushing, this embodiment is more convenient and time - saving.

[0032] The annular separation zone 2 includes a plurality of inclined plate packings. The plurality of inclined plate packings are arranged around the outer periphery of the outermost annular reaction tank, and there are water - passing gaps between adjacent inclined plate packings. Each inclined plate packing has an angle with the horizontal plane, so that the supernatant can enter the space above the inclined plate packing through the water - passing gap and enter the annular water distribution tank 8, while the floc sludge and the like fall below the inclined plate packing and are centrally treated. As a preferred solution, the inclined plate packings are placed at an inclination angle of 60° clockwise from the center.

[0033] An annular sludge chamber is provided inside the outer cylinder 1 at a position corresponding to the lower end of the outermost annular reaction tank. The mixed - water outlet can communicate with the annular sludge chamber; an annular separation chamber is provided inside the outer cylinder 1 at a position corresponding to the lower end of the annular separation zone 2. The annular separation chamber is communicated with the annular sludge chamber through a plurality of through - holes. The mixed water in the annular separation chamber can pass through the annular separation zone 2 from bottom to top for sediment - water separation. The separated supernatant enters the upper part of the annular separation zone 2 and reaches the water distribution tank, and the separated floc sludge falls to the bottom of the annular separation chamber.

[0034] An outlet overflow weir 7 is installed on the inner ring of the water distribution tank. The separated supernatant enters the water distribution tank through the outlet overflow weir 7, and a plurality of water - separating plates are provided in the water distribution tank. The plurality of water - separating plates are arranged circumferentially, and there are water outlets between adjacent water - separating plates. Each water outlet is respectively used to connect each reaction water tank to ensure that the outlet water can be evenly distributed to each subsequent reaction water tank.

[0035] The sludge treatment module includes a reflux element 11, a cleaning port 12, a first sludge discharge pipe 14, a main sludge discharge pipe 15 and a plurality of second sludge discharge pipes 10. A multi-hopper sludge discharge area 9 is provided at the bottom of the annular separation chamber. The inner bottom surface of the multi-hopper sludge discharge area 9 is provided with a plurality of downwardly protruding sludge discharge grooves. The bottom of each sludge discharge groove is respectively connected to one end of a second sludge discharge pipe 10. The other ends of the second sludge discharge pipes 10 are all communicated with the main sludge discharge pipe 15. One end of the main sludge discharge pipe 15 is communicated with the reflux element 11. The cleaning port 12 is opened on the main sludge discharge pipe 15 and is arranged close to the reflux element 11. And the cleaning port 12 is used for externally connecting an anti-washing device. The first sludge discharge pipe 14, the main sludge discharge pipe 15 and each second sludge discharge pipe 10 are periodically flushed at the cleaning port 12 by the impact force of the reflux element 11 to prevent fouling. Valves are provided at the cleaning port 12 and at each second sludge discharge pipe 10. Furthermore, the opening and closing of the valves control the sludge discharge action and the cleaning action. A tee is provided on the first sludge discharge pipe 14. The first end of the tee is communicated with the reflux element 11. The second end of the tee is communicated with the lower end of the innermost annular reaction tank. The third end of the tee forms a sludge discharge port externally. The reflux element 11 can be adjusted in frequency conversion. The reflux element 11 can pass the alum flower sludge collected in the main sludge discharge pipe 15 into the lower part of the innermost annular reaction tank through the first sludge discharge pipe 14, and make the alum flower sludge form a fixed suspension mud layer under the innermost annular reaction tank, thereby effectively intercepting fine and light flocs and avoiding the problem of poor precipitation effect in the precipitation area caused by the floating of fine and light flocs.

[0036] The reflux element 11 is a pump.

[0037] In the present utility model, specific examples are used to elaborate the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A ring-shaped grid flocculation and sedimentation device, characterized in that: It includes an annular water distribution tank, an outer cylinder, an annular separation zone, a sludge treatment module and a plurality of annular reaction tanks. The annular water distribution tank is installed at the upper end of the outer cylinder and is in communication with the interior of the outer cylinder. The plurality of annular reaction tanks are located inside the outer cylinder. The sludge treatment module is located at the lower end of the annular reaction tanks. The plurality of annular reaction tanks are sleeved in sequence. The inner ring of the annular separation zone is installed in the middle of the outer wall of the outermost annular reaction tank. The outer ring of the annular separation zone is installed in the middle of the inner wall of the outer cylinder, and both ends of the annular separation zone can communicate with the interior of the outer cylinder. A plurality of grid plates arranged in sequence in the vertical direction are installed in each annular reaction tank. One end of the innermost annular reaction tank is the raw water inlet, and one end of the outermost annular reaction tank is the mixed water outlet. In adjacent annular reaction tanks, water enters the annular reaction tank located in the outer layer from the annular reaction tank located in the inner layer.

2. The annular grid flocculation and sedimentation device according to claim 1, wherein: The annular reaction tank is divided into a primary annular reaction tank and a secondary annular reaction tank. The primary annular reaction tank includes a number of primary grid shafts. One end of one of the primary grid shafts is the raw water inlet, and water sequentially enters each of the primary grid shafts, and the water flow directions in adjacent primary grid shafts are opposite; the secondary annular reaction tank includes a number of secondary grid shafts, and the plurality of secondary grid shafts are arranged in a ring and are arranged around the primary annular reaction tank. One end of one of the secondary grid shafts is the water inlet end of the secondary annular reaction tank, and the water inlet end of the secondary annular reaction tank communicates with the water outlet end of the primary annular reaction tank. Water sequentially enters each of the secondary grid shafts, and the water flow directions in adjacent secondary grid shafts are opposite. One end of another secondary grid shaft is the mixed water outlet.

3. The annular grid flocculation and sedimentation device according to claim 2, characterized in that: There are two primary grid shafts. The primary grid shaft where the raw water inlet is located is the primary grid inlet shaft, and the other primary grid shaft is the primary grid outlet shaft. The lower end of the primary grid inlet shaft communicates with one end of the inlet pipe. The other end of the inlet pipe communicates with the raw water source, and a coagulant can be introduced into the inlet pipe. The upper end of the primary grid inlet shaft communicates with the upper end of the primary grid outlet shaft. The lower end of the primary grid outlet shaft communicates with the water inlet end of the secondary annular reaction tank; there are a plurality of secondary grid shafts. The secondary grid shaft where the water inlet end of the secondary annular reaction tank is located is the secondary grid inlet shaft. The water inlet end of the secondary annular reaction tank is located at the upper end of the secondary grid inlet shaft. The lower end of the secondary grid inlet shaft communicates with the lower end of an adjacent secondary grid shaft.

4. The annular grid flocculation and sedimentation device according to claim 2, characterized in that: The volumes of all the primary grid shafts are the same, and in the water flow direction, the diameters of the water passing openings of all the primary grid shafts gradually increase; the volumes of all the secondary grid shafts are the same, and in the water flow direction, the diameters of the water passing openings of all the secondary grid shafts gradually increase.

5. The annular grid flocculation and sedimentation device according to claim 2, characterized in that: Each of the first - level grid shafts and each of the second - level grid shafts can be detachably installed in the outer cylinder body, and each of the grid plates can be detachably installed in the first - level grid shaft or the second - level grid shaft.

6. The annular grid flocculation and sedimentation device according to claim 1, wherein: The annular separation zone includes a plurality of inclined - plate packings. The plurality of inclined - plate packings are arranged around the outer periphery of the outermost annular reaction tank, and there is a water - passing gap between adjacent inclined - plate packings. Each of the inclined - plate packings forms an angle with the horizontal plane.

7. The annular grid flocculation and sedimentation device according to claim 1, characterized in that: An annular sludge chamber is provided in the outer cylinder body at a position corresponding to the lower end of the outermost annular reaction tank. The mixed - water outlet can communicate with the annular sludge chamber. An annular separation chamber is provided in the outer cylinder body at a position corresponding to the lower end of the annular separation zone. The annular separation chamber is communicated with the annular sludge chamber. The mixed water in the annular separation chamber can pass through the annular separation zone from bottom to top for sediment - water separation. The separated supernatant enters above the annular separation zone and reaches the water distribution tank, and the separated floc sludge falls to the bottom of the annular separation chamber.

8. The annular grid flocculation and sedimentation device according to claim 7, characterized in that: An outlet overflow weir is installed on the inner ring of the water distribution tank. The separated supernatant enters the water distribution tank through the outlet overflow weir. A plurality of water - separating plates are provided in the water distribution tank. The plurality of water - separating plates are arranged circumferentially, and there is an outlet between adjacent water - separating plates. Each of the outlets is respectively used to connect each reaction tank.

9. The annular grid flocculation and sedimentation device according to claim 7, wherein: The sludge treatment module includes a reflux element, a cleaning port, a first sludge discharge pipe, a sludge discharge main pipe, and a plurality of second sludge discharge pipes. A multi - hopper sludge discharge area is provided at the bottom of the annular separation chamber. The inner bottom surface of the multi - hopper sludge discharge area is provided with a plurality of downward - protruding sludge discharge grooves. The bottom of each sludge discharge groove is respectively connected to one end of a second sludge discharge pipe. The other ends of the second sludge discharge pipes are all communicated with the sludge discharge main pipe. One end of the sludge discharge main pipe is communicated with the reflux element. The cleaning port is opened on the sludge discharge main pipe and is arranged close to the reflux element. The cleaning port is used to connect an external back - washing device. Valves are provided at the cleaning port and each of the second sludge discharge pipes. A three - way pipe is provided on the first sludge discharge pipe. The first end of the three - way pipe is communicated with the reflux element. The second end of the three - way pipe is communicated with the lower end of the innermost annular reaction tank. The third end of the three - way pipe forms a sludge discharge port outside. The reflux element can be adjusted in frequency, and the reflux element can pass the floc sludge collected in the sludge discharge main pipe into the lower part of the innermost annular reaction tank through the first sludge discharge pipe, and make the floc sludge form a fixed suspension sludge layer under the innermost annular reaction tank.

10. The annular grid flocculation and sedimentation device according to claim 9, characterized in that: The reflux element is a pump.

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