Dehydration system for wastewater treatment

Abstract

The invention discloses a dehydration system for wastewater treatment, belongs to the technical field of wastewater treatment, and is used for solving the problems that in the prior art, the action time of wastewater and a flocculating agent is short, and the effect of sufficient flocculation cannot be achieved. The dehydration system comprises a concentration tank, a steady flow outer barrel, a flocculation inner barrel, a dispersion grid and a wedge-shaped circular ring, a material distribution opening and an underflow opening which are formed in the flow stabilization outer barrel are both located below the liquid level of the concentration tank, the flocculation inner barrel is located in the flow stabilization outer barrel and located above the liquid level of the concentration tank, and the dispersion grid and the wedge-shaped circular ring are arranged on the inner wall of the flocculation inner barrel; in the wastewater treatment process, the flocculation inner barrel is in a rotating state. The method can be used for wastewater treatment.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and particularly relates to a dewatering system for wastewater treatment. Background Technology

[0002] For wastewater treatment, the wastewater is usually mixed with flocculants and then dehydrated.

[0003] In existing technologies, dewatering systems typically involve first adding flocculant to a mixing tank to mix with wastewater before introducing it into a thickening tank for further treatment.

[0004] However, when wastewater and flocculant are directly mixed in the mixing tank, the interaction time between the wastewater and flocculant is too short to achieve sufficient flocculation, which affects the dewatering treatment of wastewater. Summary of the Invention

[0005] Based on the above analysis, the present invention aims to provide a dewatering system for wastewater treatment, which solves the problem in the prior art that the interaction time between wastewater and flocculant is short and the effect of sufficient flocculation cannot be achieved.

[0006] The objective of this invention is mainly achieved through the following technical solutions.

[0007] This invention provides a dewatering system for wastewater treatment, comprising a thickening tank, a flow-stabilizing outer tank, a flocculation inner tank, a dispersing grid, and a wedge-shaped ring;

[0008] The material distribution port and the bottom flow port on the steady flow outer tank are both located below the liquid surface of the thickener. The flocculation inner tank is located inside the steady flow outer tank and above the liquid surface of the thickener. The dispersing grid and the wedge-shaped ring are located on the inner wall of the flocculation inner tank.

[0009] During the wastewater treatment process, the flocculation inner tank is in a rotating state.

[0010] Furthermore, the dispersive grid includes an annular grid and a radial grid. One end of the radial grid is fixedly connected to the flocculation inner tank, and the other end of the radial grid is suspended. The annular grid is placed on the radial grid.

[0011] Furthermore, the annular grille and the radial grille are detachably and fixedly connected.

[0012] Furthermore, the distance between the annular grid on the side closest to the inner wall of the flocculation tank and the inner wall of the flocculation tank is greater than 30mm.

[0013] Furthermore, the dispersing grid is set vertically relative to the inner wall of the flocculation tank.

[0014] Furthermore, the material outlet is located on the side wall of the flow-stabilizing outer barrel, and the bottom outlet is located at the bottom of the flow-stabilizing outer barrel.

[0015] Furthermore, the multi-layered distributed grid is uniformly arranged in the vertical direction, and multiple wedge-shaped rings are arranged in the vertical direction.

[0016] Furthermore, the wedge-shaped ring is located below the dispersed grid.

[0017] Furthermore, the flocculation inner tank includes multiple flocculation sections connected in sequence.

[0018] Furthermore, from bottom to top, the angle between the inner wall of multiple flocculation sections and the horizontal direction gradually increases.

[0019] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0020] A) The dewatering system for wastewater treatment provided by this invention includes a flocculation inner tank inside a flow-stabilizing outer tank, and a dispersion grid and a wedge-shaped ring on the inner wall of the flocculation inner tank. On the one hand, during the high-speed rotation of the flocculation inner tank, the dispersion grid induces a Karman vortex street on the rising film on the wall of the flocculation inner tank, and the particles are further enhanced to collide in the Karman vortex street, causing floc growth. On the other hand, through the setting of the wedge-shaped ring, during the high-speed rotation of the flocculation inner tank, the wedge-shaped ring induces turbulent micro-vortices in the mixed wastewater and flocculant rising along the wall. The wastewater and flocculant are fully stirred under the action of the turbulent micro-vortices, increasing the collision frequency between particles and between particles and flocculant molecules in the wastewater.

[0021] B) The dewatering system for wastewater treatment provided by the present invention, through the setting of the feeding port, enables wastewater to be evenly discharged into the thickening tank, preventing the sediment layer from being too thick and clogging the bottom outlet of the stabilizing outer tank. The circular baffle on the outside of the feeding port prevents the radial feeding flow from causing excessive interference to the wastewater in the settling process during the feeding process.

[0022] C) The dewatering system for wastewater treatment provided by this invention, on the one hand, enables staged mixing of wastewater and flocculant. The dispersing grid prioritizes the initial mixing of wastewater and flocculant, while the wedge-shaped ring further refines the mixing, protecting floc growth and reducing the occurrence of floc breakage caused by strong turbulence in a single flow. On the other hand, the initial dispersion of wastewater and flocculant using the dispersing grid reduces the stirring intensity required by the subsequent wedge-shaped ring. Furthermore, the stabilizing outer tank serves both as the stabilizing outer tank of a traditional thickener and rapidly slows down the discharge rate of the inner flocculation tank, preventing excessively high flow rates from damaging existing flocs and eroding the sediment layer.

[0023] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained through the embodiments described and the accompanying drawings, which are particularly pointed out. Attached Figure Description

[0024] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0025] Figure 1 This is a schematic diagram of the structure of the wastewater treatment dewatering system provided in Embodiment 1 of the present invention;

[0026] Figure 2 This is a schematic diagram of the structure of the dispersion grid in the wastewater treatment dewatering system provided in Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the wastewater inlet pipe in the wastewater treatment dewatering system provided in Embodiment 1 of the present invention;

[0028] Figure 4 This is a schematic diagram of the structure of the atomizing feeder, atomizing dosing device, and drive motor in the wastewater treatment dewatering system provided in Embodiment 1 of the present invention;

[0029] Figure 5 This is a schematic diagram of the structure of the fixed feeding sleeve in the wastewater treatment dewatering system provided in Embodiment 1 of the present invention.

[0030] Figure label:

[0031] 1-Inner flocculation tank; 2-Atomizing feeder; 21-Fixed feed sleeve; 22-Rotating feed sleeve; 23-Support plate; 24-External inlet for flocculant; 3-Atomizing dosing device; 31-Rotating dosing sleeve; 32-Inner inlet for flocculant; 4-Flocculant dosing arm; 5-Flocculant atomizing nozzle; 6-Wastewater feed arm; 7-Wastewater feed port; 8-Drive motor; 81-Motor shaft; 82-Transmission center shaft; 9-Dispersion grid; 91-Annular grid; 92-Radial grid; 10-Wedge-shaped ring; 11-Concentrator; 12-Stabilizing outer tank; 13-Distribution port; 14-Bottom flow port; 15-Wastewater inlet pipe; 16-Flocculant storage tank; 17-Flocculant delivery pump; 18-Storage tank control valve; 19-Flocculant guide pipe. Detailed Implementation

[0032] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0033] Example 1

[0034] This embodiment provides a dewatering system for wastewater treatment; see [link / reference]. Figure 1 The system includes a thickening tank 11, a stabilizing outer tank 12, a flocculation inner tank 1, a multi-layer dispersing grid 9, and multiple wedge-shaped rings 10. The side wall of the stabilizing outer tank 12 has a material distribution port 13, and the bottom of the stabilizing outer tank 12 has a bottom flow port 14. Both the material distribution port 13 and the bottom flow port 14 are located below the liquid surface of the thickening tank 11. The flocculation inner tank 1 is located inside the stabilizing outer tank 12 and above the liquid surface of the thickening tank 11. The dispersing grid 9 and the wedge-shaped rings 10 are located on the inner wall of the flocculation inner tank 1. The dispersing grid 9 is set vertically relative to the inner wall of the flocculation inner tank 1. During the wastewater treatment process, the flocculation inner tank 1 is in a rotating state.

[0035] For the structure of the distributed grid 9, see, for example, [reference needed]. Figure 2 It adopts a detachable structure, including an annular grid 91 and a radial grid 92. One end of the radial grid 92 is fixedly connected to the flocculation inner tank 1, and the other end of the radial grid 92 is suspended. The annular grid 91 is set on the radial grid 92 and is detachably fixedly connected to the radial grid 92. The annular grid 91 is coaxially arranged with the flocculation inner tank 1.

[0036] Compared with the prior art, the wastewater treatment dewatering system provided in this embodiment has a flocculation inner tank set inside the stabilizing outer tank 12, and a dispersing grid 9 and a wedge-shaped ring 10 set on the inner wall of the flocculation inner tank. On the one hand, during the high-speed rotation of the flocculation inner tank 1, the dispersing grid 9 (radial grid 92) will induce the Karman vortex street to appear on the flow film rising on the wall surface of the flocculation inner tank 1. The particles are further enhanced to collide in the Karman vortex street, which promotes floc growth. On the other hand, through the setting of the wedge-shaped ring 10, during the high-speed rotation of the flocculation inner tank 1, the wedge-shaped ring 10 will induce turbulent micro-vortices in the mixed wastewater and flocculant rising along the wall surface. The wastewater and flocculant will be fully stirred under the action of the turbulent micro-vortices, increasing the collision frequency between particles and particles and between particles and flocculant molecules in the wastewater.

[0037] In addition, the setting of the material distribution port 13 ensures that the wastewater is evenly discharged into the thickening tank 11, preventing the sediment layer from being too thick and clogging the bottom outlet 14 of the flow stabilizing outer tank 12. The circular baffle on the outside of the material distribution port 13 prevents the radial material flow from causing excessive interference to the wastewater in the settling process during the material distribution process.

[0038] The multi-layered dispersing grid 9 is evenly arranged in the vertical direction, and multiple wedge-shaped rings 10 are arranged in the vertical direction. The dispersing grid 9, wedge-shaped rings 10 and flocculation inner tank 1 are coaxially arranged.

[0039] The design of the multi-layer dispersion grid 9 further disperses the wastewater as it falls to the bottom, allowing the atomized flocculant to fully mix with the wastewater passing through the multi-layer dispersion grid 9. The wastewater that passes through the dispersion grid 9 later will wash the wastewater that has been mixed with the flocculant down, preventing flocs from sticking to the walls of the dispersion grid 9.

[0040] For example, the wedge-shaped ring 10 is located below the dispersing grid 9. This positional relationship, with its top-to-bottom flow sequence (dispersing grid 9 → wedge-shaped ring 10 → climbing the barrel wall), conforms to the natural laws of particle settling and swirling motion in a hypergravity field. The wastewater flow path is smoother, preventing wastewater from accumulating below the grid and improving equipment operating efficiency.

[0041] On the one hand, it enables staged mixing of wastewater and flocculant. The dispersing grid 9 prioritizes the initial mixing of wastewater and flocculant, while the wedge-shaped ring 10 further refines the mixing, protecting floc growth and reducing the occurrence of floc breakage caused by strong turbulence in a single flow. On the other hand, the initial dispersion of wastewater and flocculant by the dispersing grid 9 reduces the stirring intensity required by the subsequent wedge-shaped ring 10. Furthermore, the stabilizing outer tank 12 serves both as the stabilizing outer tank 12 of the traditional thickening tank 11 and rapidly slows down the discharge speed of the flocculation inner tank, preventing excessively high flow rates from damaging the formed flocs and eroding the sediment layer.

[0042] It should be noted that if the dispersing grid 9 is below the wedge-shaped ring 10, the high-speed rotating wedge-shaped ring 10 will first generate violent eddies, causing the fluid to collide disorderly with the dispersing grid 9, affecting the uniform dispersion effect of the dispersing grid 9, causing the already formed flocs to be torn apart, destroying the bond between the flocculant and the particles, resulting in loose flocs. In addition, if the dispersing grid 9 is below the wedge-shaped ring 10, the eddies generated by the wedge-shaped ring 10 may push the flocs to the dispersing grid 9, causing blockage, requiring frequent cleaning, and affecting continuous operation.

[0043] Based on the above structure, the flow process of wastewater and flocculant is a three-stage enhanced mixing process (atomization dispersion → dispersing grid 9 cutting → wedge-shaped ring 10 micro-vortex), the specific process is as follows:

[0044] Initial dispersion stage: Wastewater is dispersed and sprayed through wastewater feed port 7, and flocculant is atomized into small droplets through flocculant atomizing nozzle 5. Both fall synchronously from top to bottom in the flocculation inner tank 1.

[0045] The dispersing grid 9 operates in the following stages: wastewater and flocculant first pass through the dispersing grid 9, the annular grid 91 and the radial grid 92 cut the fluid into multiple fine streams, forming turbulence and vortices, promoting the initial collision and mixing of particles and flocculant. Part of the mixture slides along the dispersing grid 9 toward the inner wall of the flocculation tank 1, while the rest continues to fall through the gaps in the dispersing grid 9.

[0046] Wedge-shaped ring 10 reinforcement stage: When the fluid reaches the bottom of the wedge-shaped ring 10, the high-speed rotating wedge-shaped ring 10 induces micro-eddies (i.e. turbulence) in the fluid, which agitates the insufficiently mixed wastewater and flocculant a second time. The mixed fluid rises along the inner wall of the flocculation inner tank 1. When the wastewater rises to the position of the wedge-shaped ring 10, the wedge-shaped ring 10 induces turbulent micro-eddies, which make the wastewater and flocculant fully mixed under the action of the micro-eddies, increasing the collision frequency and further improving the flocculation effect. The fully mixed wastewater and flocculant finally overflow from the top opening of the flocculation inner tank 1 to the stable flow outer tank 12, and finally enter the thickening tank 11 for subsequent treatment.

[0047] To further prevent the dispersing grid 9 from clogging the flocs in the rising film on the inner wall of the flocculation tank 1, the distance between the annular grid 91 on the side closest to the inner wall of the flocculation tank 1 and the inner wall of the flocculation tank 1 is greater than 30 mm (e.g., 30-50 mm), which is greater than the thickness of the maximum film in the flocculation tank 1.

[0048] For the structure of the flocculation inner tank 1, exemplarily, it includes multiple flocculation sections connected in sequence, with the angle between the inner wall of the multiple flocculation sections and the horizontal direction gradually increasing from bottom to top. In this way, on the one hand, the inner wall of the flocculation inner tank 1 can buffer the wastewater, and on the other hand, the inner wall of the flocculation inner tank 1 can promote the rise of wastewater along the flocculation inner tank 1, while ensuring that the wastewater has sufficient flocculation time in the flocculation inner tank 1.

[0049] The aforementioned wastewater treatment dewatering system also includes an atomizing feeder 2 and an atomizing dosing device 3 within the flocculation inner tank 1, see [link / reference]. Figure 1 During the wastewater treatment process, the flocculation inner tank 1, the atomizing dosing device 3, and the atomizing feeder 2 are always in a state of synchronous rotation relative to the flow stabilizing outer tank 12, and the atomizing feeder 2 and the atomizing dosing device 3 are located above the dispersing grid 9.

[0050] In this way, on the one hand, utilizing the jet cavitation effect, the flocculant is dispersed and atomized into small droplets by the atomizing dosing device 3. The wastewater is then dispersed by the atomizing feeder 2 and fed into the flocculation inner tank 1. In the flocculation inner tank 1, the distribution of flocculant in the wastewater is expanded, increasing the contact area between the wastewater and the flocculant. The flocculant droplets and the dispersed wastewater can fully contact and mix, thereby effectively improving the flocculation effect. On the other hand, the high-speed rotation of the flocculation inner tank 1 can promote the swirling flow of the wastewater, greatly prolonging the residence time of the wastewater at the bottom of the flocculation inner tank 1. The increased collision frequency and collision time between the flocculant and the particles in the wastewater can effectively increase the probability of particle flocculation, thereby improving the flocculation effect.

[0051] Understandably, in order to supply flocculant and wastewater, the aforementioned wastewater treatment dewatering system also includes a flocculant dosing unit and a wastewater feeding unit. The atomizing feeder 8 is connected to the wastewater feeding unit, and the atomizing dosing device 3 is connected to the flocculant dosing unit. It should be noted that the flocculant includes a composite agent of polyacrylamide (PAM) and inorganic salts.

[0052] Regarding the structure of the wastewater feeding unit, specifically, the wastewater feeding unit includes a wastewater inlet pipe 15, and an atomizing feeder 8 passes through the wastewater inlet pipe 15 (see...). Figure 3 The wastewater inlet pipe 15 is connected to the wastewater discharge port of the wastewater discharge equipment. One end of the wastewater inlet pipe 15 is connected to the wastewater discharge port of the wastewater discharge equipment, and the other end of the wastewater inlet pipe 15 passes through the side wall of the flow stabilizing outer tank 12 and is connected to the bottom of the atomizing feeder 8. The wastewater inlet pipe 15 and the flow stabilizing outer tank 12 are sealed and fixedly connected.

[0053] Specifically, the structure of the flocculant dosing unit includes a flocculant storage tank 16 and a flocculant delivery pump 17. The flocculant storage tank 16, the flocculant delivery pump 17 and the atomizing dosing device 3 are connected in sequence. A storage tank control valve 18 is provided on the connecting pipeline between the flocculant storage tank 16 and the flocculant delivery pump 17. The flocculant delivery pump 17 is connected to the atomizing dosing device 3 through a flocculant guide pipe 19.

[0054] In order to facilitate the high dispersion of flocculant in the inner flocculation tank 1 and improve the uniformity of flocculant distribution, the above-mentioned wastewater treatment dewatering system also includes a flocculant dosing arm 4 and a flocculant atomizing nozzle 5. The flocculant dosing arm 4 is located on the outer wall of the atomizing dosing device 3, and the flocculant atomizing nozzle 5 is located at the suspended end of the flocculant dosing arm 4 and is connected to the inner cavity of the atomizing dosing device 3 through the flocculant dosing arm 4.

[0055] Accordingly, in order to facilitate the high dispersion of wastewater in the flocculation inner tank 1 and improve the uniformity of wastewater distribution, the above-mentioned wastewater treatment dewatering system also includes a wastewater feeding arm 6 and a wastewater feeding port 7. The wastewater feeding arm 6 is located on the outer wall of the atomizing feeder 2, and the wastewater feeding port 7 is located at the suspended end of the wastewater feeding arm 6 and is connected to the inner cavity of the atomizing feeder 2 through the wastewater feeding arm 6.

[0056] In order to ensure that the falling wastewater passes through the dispersion grid 9 fully, the length of the flocculant dosing arm 4 in the same vertical plane is less than the length of the wastewater feeding arm 6, so that the falling wastewater flow is scattered again with the flocculant to the dispersion grid 9 under the influence of the cavitation effect at the flocculant atomizing nozzle 5.

[0057] Understandably, in order to drive the flocculation inner tank 1, the atomizing dosing device 3 and the atomizing feeder 2 to rotate synchronously, the above-mentioned gravity flow stabilizing device also includes a drive motor 8 for driving the flocculation inner tank 1, the atomizing dosing device 3 and the atomizing feeder 2 to rotate.

[0058] For example, the specific structure and positional relationship of the drive motor 8, the flocculation inner tank 1, the atomizing dosing device 3, and the atomizing feeder 2 can be found in [reference needed]. Figures 4 to 5 The details are as follows:

[0059] The atomizing feeder 2 includes a fixed feeding sleeve 21, a rotating feeding sleeve 22, and a support plate 23 arranged sequentially from top to bottom. The top end of the rotating feeding sleeve 22 is sealed and rotatably connected to the bottom end of the fixed feeding sleeve 21. The inner cavity of the fixed feeding sleeve 21 and the inner cavity of the rotating feeding sleeve 22 are not connected. The bottom end of the rotating feeding sleeve 22 passes through the bottom of the flocculation inner tank 1 and is sealed and fixedly connected to the bottom of the flocculation inner tank 1. The support plate 23 is located at the bottom end of the rotating feeding sleeve 22 and has a plate hole. The wastewater feeding arm 6 is located on the side wall of the rotating feeding sleeve 22 and communicates with the inner cavity of the rotating feeding sleeve 22. The side wall of the fixed feeding sleeve 21 has a flocculant inlet 24, which is connected to the flocculant guide pipe 19 to facilitate the supply of flocculant into the inner cavity of the fixed feeding sleeve 21.

[0060] The atomizing dosing device 3 includes a rotating dosing sleeve 31, which passes through the fixed feeding sleeve 21 and is then inserted into the rotating feeding sleeve 22. The rotating dosing sleeve 31 has a flocculant inlet 32 ​​on its side wall inside the fixed sleeve, and a flocculant outlet on its side wall inside the rotating feeding sleeve 22. The flocculant outlet is connected to the flocculant inlet of the flocculant dosing arm 4.

[0061] Accordingly, the drive motor 8 includes a motor shaft 81 and a transmission center shaft 82 fixedly connected to the bottom end of the motor shaft 81. The transmission center shaft 82 passes through the rotary dosing sleeve 31 and the rotary feeding sleeve 22 in sequence and is fixedly connected to the support plate 23. The top end of the rotary dosing sleeve 31, the bottom end of the rotary dosing sleeve 31 and the support plate 23 are all sealed and fixedly connected to the outer wall of the transmission center shaft 82.

[0062] During implementation, the drive motor 8 is turned on, and the motor shaft 81 drives the transmission center shaft 82 to rotate. Correspondingly, the transmission center shaft 82 drives the flocculation inner tank 1, the atomizing dosing device 3, and the atomizing feeder 2 to rotate simultaneously. Wastewater is supplied from the bottom end of the rotary feeding sleeve 22 through the disc hole of the support plate 23 into the inner cavity of the rotary feeding sleeve 22. The wastewater flows upward to the top end of the rotary feeding sleeve 22, and then passes through the wastewater feeding arm 6 and is sprayed into the flocculation inner tank 1 from the wastewater feeding port 7. Flocculant is supplied from the flocculant outer inlet into the inner cavity of the fixed feeding sleeve 21, and then from the flocculant inner inlet 32. The flocculant is fed into the inner cavity of the rotary dosing sleeve 31. It flows downward to the bottom of the rotary dosing sleeve 31 and is then sprayed from the flocculant atomizing nozzle 5 into the flocculation inner tank 1 through the flocculant outlet and the flocculant dosing arm 4. In the flocculation inner tank 1, the flocculant and wastewater are subjected to centrifugal force, mix thoroughly, and undergo flocculation reaction to generate sediment. The fully mixed and flocculated material is discharged from the top of the flocculation inner tank 1 into the interlayer between the stabilizing outer tank 12 and the flocculation inner tank 1, and slides down the interlayer to the bottom of the stabilizing outer tank 12. Then, it enters the thickening tank 11 through the distribution port 13 and the bottom flow port 14.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes 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. A dewatering system for wastewater treatment, characterized in that, Includes a thickening tank, a flow-stabilizing outer tank, a flocculation inner tank, a dispersion grid, and a wedge-shaped ring; The material inlet and the bottom outlet on the stabilizing outer tank are both located below the liquid surface of the thickening tank. The flocculation inner tank is located inside the stabilizing outer tank and above the liquid surface of the thickening tank. The dispersing grid and the wedge-shaped ring are located on the inner wall of the flocculation inner tank. During the wastewater treatment process, the flocculation inner tank is in a rotating state.

2. The wastewater treatment dewatering system according to claim 1, characterized in that, The dispersing grid includes an annular grid and a radial grid. One end of the radial grid is fixedly connected to the flocculation inner tank, and the other end of the radial grid is suspended. The annular grid is disposed on the radial grid.

3. The wastewater treatment dewatering system according to claim 2, characterized in that, The annular grille and the radial grille are detachably and fixedly connected.

4. The wastewater treatment dewatering system according to claim 2, characterized in that, The distance between the annular grid on the side closest to the inner wall of the flocculation tank and the inner wall of the flocculation tank is greater than 30mm.

5. The wastewater treatment dewatering system according to claim 1, characterized in that, The dispersing grid is arranged vertically relative to the inner wall of the flocculation tank.

6. The wastewater treatment dewatering system according to claim 1, characterized in that, The fabric inlet is located on the side wall of the flow-stabilizing outer barrel, and the bottom outlet is located at the bottom of the flow-stabilizing outer barrel.

7. The wastewater treatment dewatering system according to claim 1, characterized in that, The multi-layered distributed grid is uniformly arranged in the vertical direction, and multiple wedge-shaped rings are arranged in the vertical direction.

8. The wastewater treatment dewatering system according to any one of claims 1 to 7, characterized in that, The wedge-shaped ring is located below the dispersion grid.

9. The wastewater treatment dewatering system according to any one of claims 1 to 7, characterized in that, The flocculation inner tank includes multiple flocculation sections connected in sequence.

10. The wastewater treatment dewatering system according to claim 9, characterized in that, From bottom to top, the angle between the inner wall of multiple flocculation sections and the horizontal direction gradually increases.

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