Front coagulation device for sludge dewatering

Abstract

The invention discloses a front coagulation device for sludge dewatering, and relates to the technical field of sludge treatment. The device comprises a sewage container and a filtering device, the sewage container is used for providing a reaction place for the coagulation process before sludge dewatering, a sewage inlet is formed in the bottom of the sewage container, a supernatant outlet and a coagulative precipitation outlet are formed in the top of the sewage container, and the coagulative precipitation outlet is lower than the supernatant outlet so that coagulative precipitation can be discharged to sludge dewatering equipment; the supernate outlet is used for discharging the coagulated supernate; the filtering device is arranged at the supernatant outlet and is used for filtering and intercepting coagulative precipitation in the supernatant before the supernatant is discharged. Compared with a pure coagulation pipeline or coagulation tank, the sludge dewatering device has the advantages that the sludge filtering and cement shunting functions are added, so that the treatment capacity of sludge dewatering equipment is improved. On the premise of the same sewage treatment capacity, the operation energy consumption of sludge dewatering equipment can be reduced, the investment cost and the operation cost of a sludge treatment process section are reduced, and the purposes of reducing cost and improving efficiency are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment, in particular to a pre-coagulation device for sludge dewatering. BACKGROUND

[0002] The existing sludge dewatering equipment needs a coagulation pipeline or coagulation tank at the front end to ensure that the sewage is fully coagulated before entering the equipment, so as to achieve the purpose of sludge removal. However, the existing coagulation pipeline or coagulation tank has the following problems:

[0003] (1) Only coagulation effect, sewage still needs to be treated in full amount in the sludge dewatering equipment, which reduces the sludge treatment effect and sludge treatment efficiency;

[0004] (2) The selection of the sludge dewatering equipment leaves a certain margin, if the sewage is fully flowed into the sludge dewatering equipment for treatment after pre-coagulation, the maximum potential of the sludge dewatering equipment cannot be played, the sewage treatment capacity is reduced under the same operation cost, and there is a certain economic loss. SUMMARY

[0005] The purpose of the present application is to provide a pre-coagulation device for sludge dewatering, which not only has coagulation effect, but also has filtering function, compared with the existing coagulation pipeline and coagulation tank, the sewage treatment capacity, sludge treatment effect and sludge treatment efficiency are improved, and the operation cost of the sludge dewatering equipment is reduced, which solves the problems of the above-mentioned prior art.

[0006] To achieve the above-mentioned purpose, the present application provides the following solutions:

[0007] The present application provides a pre-coagulation device for sludge dewatering, comprising:

[0008] A sewage container is used to provide a reaction place for the coagulation process before sludge dewatering, the bottom of the sewage container is provided with a sewage inlet, the top of the sewage container is provided with a supernatant outlet and a coagulation sediment outlet, the coagulation sediment outlet is lower than the supernatant outlet, so as to discharge the coagulation sediment to the sludge dewatering equipment; the supernatant outlet is used to discharge the supernatant after coagulation;

[0009] A filtering device is arranged at the supernatant outlet, which is used to filter and intercept the coagulation sediment in the supernatant before the supernatant is discharged.

[0010] In some embodiments, the sewage container comprises:

[0011] A vertically arranged tank body, the bottom of the tank body is provided with the sewage inlet, the top sidewall of the tank body is provided with the filtering device, the top end of the tank body is closed or can allow the sewage to overflow, the top sidewall of the tank body is provided with the coagulation sediment outlet, and the coagulation sediment outlet is lower than the filtering device;

[0012] A transition container is sleeved outside the top of the tank body to enclose the filter device inside, the transition container is higher than the coagulation sediment outlet, a closed water storage cavity is formed between the transition container and the top of the tank body, the closed water storage cavity is used for temporarily storing the supernatant filtered by the filter device, and the supernatant outlet is arranged on the transition container and communicates with the closed water storage cavity.

[0013] In some embodiments, the filter device is a ring-shaped filter screen capable of intercepting the coagulation sediment, the ring-shaped filter screen is embedded in the top side wall of the tank body, or the ring-shaped filter screen is integrally formed in the top side wall of the tank body, or the top side wall of the tank body is provided with a water outlet hole, and the ring-shaped filter screen is sleeved on the outer wall or the inner wall of the water outlet hole area of the tank body.

[0014] In some embodiments, the pre-coagulation device for sludge dewatering further comprises a filter screen flushing mechanism, the filter screen flushing mechanism comprises:

[0015] A flushing pipe is arranged inside the transition container and located outside the ring-shaped filter screen, a water inlet end of the flushing pipe is used for connecting a flushing water source, and a water outlet end of the flushing pipe is provided with a water outlet opening facing the ring-shaped filter screen;

[0016] A flushing nozzle is arranged on the water outlet opening and used for spraying flushing water flow to the ring-shaped filter screen.

[0017] In some embodiments, the filter screen flushing mechanism further comprises a rotary driving mechanism, the rotary driving mechanism is arranged on the transition container;

[0018] The flushing pipe is a Z-shaped flushing pipe, the Z-shaped flushing pipe comprises a water inlet pipe section, a connecting pipe section and a water outlet pipe section which are sequentially communicated, the water outlet pipe section is located outside the ring-shaped filter screen, the flushing nozzle is arranged on one side of the water outlet pipe section facing the ring-shaped filter screen, the water inlet pipe section penetrates through the top of the transition container and is rotationally matched with the transition container, and the water inlet pipe section is used for being connected with the flushing water source through a rotary joint;

[0019] The rotary driving mechanism is connected with the outer wall of the water inlet pipe section and is used for driving the Z-shaped flushing pipe to rotate around the water inlet pipe section to rotate and flush the ring-shaped filter screen by using the water outlet pipe section.

[0020] In some embodiments, an exhaust hole is further arranged on the transition container.

[0021] In some embodiments, a cover plate which can be opened and closed is further arranged on the transition container.

[0022] In some embodiments, the coagulation sedimentation outlet is further connected with an inclined downward coagulation sedimentation discharge pipe, which is used to be connected with a sludge inlet of the sludge dewatering device.

[0023] In some embodiments, the sewage inlet is connected with a plurality of sewage inlets at the same time, and the inlet of any one of the sewage inlets is provided with a connecting flange, which is used to connect a sewage supply pipeline.

[0024] In some embodiments, the sewage inlet is connected with two coaxially arranged sewage inlets at the same time.

[0025] In some embodiments, the bottom of the tank body is further provided with a supporting leg to support the tank body above the ground.

[0026] In another aspect, the application provides an application of the aforementioned sludge dewatering pre-coagulation device in sludge dewatering treatment.

[0027] The application has the following technical effects compared with the prior art:

[0028] Compared with a simple coagulation pipeline or coagulation tank, the sludge dewatering pre-coagulation device of the application increases the functions of filtering sludge and diverting water, thereby improving the processing capacity of the sludge dewatering device. Under the premise of the same sewage processing capacity, the operation energy consumption of the sludge dewatering device can be reduced, the investment cost and operation cost of the sludge treatment process section can be reduced, and the purpose of reducing cost and increasing benefit can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] Figure 1 The overall structure schematic diagram of the sludge dewatering pre-coagulation device disclosed in the embodiments of the application;

[0031] Figure 2 The top view of Figure 1 ;

[0032] Figure 3 The flowchart of the sludge dewatering line of the application.

[0033] In the drawings: 100-sludge dewatering pre-coagulation device; 200-sludge dewatering device; 300-regulating tank;

[0034] 1-waste water container; 11-waste water inlet; 12-supernatant outlet; 13-coagulation and sedimentation outlet; 14-tank body; 15-transition container; 151-cover plate; 152-hinge; 153-vent hole; 16-closed water storage cavity; 17-supporting leg; 18-coagulation and sedimentation discharge pipe; 19-connection flange;

[0035] 2-filtering device;

[0036] 3-flushing pipe; 31-water inlet pipe section; 32-connection pipe section; 33-water outlet pipe section;

[0037] 4-flushing nozzle;

[0038] 5-rotary drive mechanism. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0040] One of the objectives of the present application is to provide a sludge dewatering pre-coagulation device, which not only has a coagulation effect, but also has a filtering function, thereby improving the sewage treatment capacity, sludge treatment effect and sludge treatment efficiency, reducing the operation cost of the sludge dewatering equipment, and solving the problems existing in the prior art.

[0041] In order to make the above objectives, features and advantages of the present application more apparent and easy to understand, the present application will be further described in detail below with reference to the drawings and specific embodiments.

[0042] Embodiment 1

[0043] As Figure 1 and Figure 2As shown, the embodiment provides a pre-coagulation device 100 for sludge dewatering, which is installed at the front end of the sludge dewatering equipment 200 to pre-treat the sewage by coagulation before the sewage enters the sludge dewatering equipment 200. The pre-coagulation device 100 for sludge dewatering includes a sewage container 1 and a filtering device 2, wherein the sewage container 1 is used to provide a reaction site for the coagulation process of the sewage before sludge dewatering, the bottom of the sewage container 1 is provided with a sewage inlet 11, the top is provided with a supernatant outlet 12 and a coagulation sediment outlet 13, and the coagulation sediment outlet 13 is lower than the supernatant outlet 12 to discharge the coagulation sediment (i.e. sludge) to the sludge dewatering equipment 200; the supernatant outlet 12 is used to discharge the supernatant generated after coagulation; the filtering device 2 is arranged at the supernatant outlet 12 to filter and intercept the coagulation sediment in the supernatant before the supernatant is discharged, so as to effectively separate the water and sludge and avoid the coagulation sediment from being discharged with the supernatant, thereby improving the sludge treatment efficiency.

[0044] As shown in some feasible embodiments, Figure 1 and Figure 2 As shown, the sewage container 1 includes a vertically arranged tank body 14 and a transition container 15, the bottom of the tank body 14 is provided with the sewage inlet 11, the top side wall of the tank body 14 is provided with the filtering device 2, and the top end of the tank body 14 can be closed or can be provided to allow the sewage to overflow. The specific structure form allowing the sewage to overflow is that the top end of the tank body 14 is directly arranged as an open mouth, or a filter screen capable of intercepting the coagulation sediment is arranged at the top end of the tank body 14, which allows only the supernatant to pass through. When the filter screen is arranged at the top end of the tank body 14, the supernatant filtering device is arranged at the top side wall and the top end of the tank body 14, which improves the discharge flow of the supernatant and ensures the separation effect of the supernatant and the coagulation sediment (sludge). The coagulation sediment outlet 13 is arranged at the top side wall of the tank body 14, and the coagulation sediment outlet 13 is lower than the aforementioned filtering device 2. The transition container 15 is sleeved on the top outer side of the tank body 14 to completely enclose the entire filtering device 2 inside, the transition container 15 is higher than the coagulation sediment outlet 13, and a closed water storage cavity 16 is formed between the transition container 15 and the top outer wall of the tank body 14, which is used to temporarily store the supernatant filtered by the filtering device 2. The supernatant outlet 12 is arranged on the transition container 15 and communicates with the closed water storage cavity 16 to timely discharge the filtered supernatant.

[0045] In some possible implementation manners, the tank body 14 is preferably a columnar shape, including but not limited to an existing reaction tank container. The transition container 15 includes but is not limited to a cylindrical container or a prismatic container, which is preferably coaxially arranged with the tank body 14, and can ensure the constancy of the fluid pressure in the closed storage water cavity 16. When the transition container 15 and the tank body 14 are both cylindrical containers, the closed storage water cavity 16 between the two is an annular cavity. The transition container 15 can be provided with one or more supernatant outlets 12 according to the supernatant discharge requirement, and any supernatant outlet 12 can be provided with a valve to control the opening and closing of the supernatant outlet 12.

[0046] In some possible implementation manners, the filter device 2 is preferably an annular filter screen capable of intercepting coagulation sedimentation, including but not limited to a wedge-shaped screen, which is a kind of existing filter screen structure, and the specific structure and functional principle are not described here. In actual production and use, the annular filter screen can be embedded and fixed on the top side wall of the tank body 14 by clamping, bonding or the like, so as to be integrated with the tank body 14. In addition, the annular filter screen can also be integrally formed on the top side wall of the tank body 14, that is, the annular filter screen is formed by uniformly opening filter holes along the top side wall of the tank body 14; the water outlet hole can also be opened on the top side wall of the tank body 14, and the annular filter screen is sleeved on the outer wall or the inner wall of the water outlet hole area of the tank body 14, and the annular filter screen is integrated with the tank body 14 by bolt fixing or bonding. As shown in Figure 1 and Figure 2 , which are structural schematic diagrams of the embedded and fixed annular filter screen on the top side wall of the tank body 14.

[0047] In some possible implementation manners, in order to avoid the filter screen being blocked after long-term filtration, thereby affecting the cement separation efficiency, a filter screen flushing mechanism is further arranged in the pre-coagulation device 100 for sludge dewatering, the filter screen flushing mechanism includes a flushing pipe 3 and a flushing nozzle 4, the flushing pipe 3 is arranged inside the transition container 15 and located outside the annular filter screen; the water inlet end of the flushing pipe 3 is used for connecting a flushing water source, and the water outlet end of the flushing pipe 3 is provided with a water outlet opening towards the annular filter screen; the flushing nozzle 4 is arranged at the water outlet opening and used for spraying flushing water flow to the annular filter screen, so as to flush the annular filter screen from outside to inside and flush the blocked sludge back to the tank body 14. The flushing pipe 3 is preferably a plastic or metal pipe, and the flushing nozzle 4 can be a common high-pressure nozzle.

[0048] In some possible implementation manners, the flushing pipe 3 can be directly fixed in the transition container 15 or movably installed in the transition container 15 for dynamic flushing. As shown in Figure 1 and Figure 2As shown, the filter screen flushing mechanism further comprises a rotary driving mechanism 5 arranged on the transition container 15; the flushing pipe 3 is a Z-shaped flushing pipe comprising a water inlet pipe section 31, a connecting pipe section 32 and a water outlet pipe section 33 connected in sequence, the water inlet pipe section 31 and the water outlet pipe section 33 are parallel and both are parallel to the axial direction of the tank body 14. The water outlet pipe section 33 is located outside the annular filter screen, and the flushing nozzle 4 is arranged on the side of the water outlet pipe section 33 facing the annular filter screen; the water inlet pipe section 31 penetrates through the top of the transition container 15 and is rotationally connected with the transition container 15, and the water inlet pipe section 31 is used to be connected with a flushing water source through a rotary joint, so as to ensure that the water outlet pipe of the flushing water source can still be connected with the water inlet pipe section 31 of the Z-shaped flushing pipe when the Z-shaped flushing pipe rotates, and at the same time, the Z-shaped flushing pipe will not be twisted due to rotation. The rotary driving mechanism 5 is connected with the outer wall of the water inlet pipe section 31 and is used to drive the Z-shaped flushing pipe to rotate around the water inlet pipe section 31, so as to rotate the annular filter screen by the water outlet pipe section 33. The rotary joint can adopt a common rotary joint, and the rotary driving mechanism 5 preferably adopts a motor assembly which comprises a motor and a speed reducer connected with the motor, the speed reducer is located outside the top of the transition container 15, the output end of the speed reducer is connected with a driving gear, the water inlet pipe section 31 is rotationally connected with the top wall of the transition container 15 through a bearing, and the part of the water inlet pipe section 31 extending out of the transition container 15 is sleeved with a driven gear meshing with the driving gear, and the motor is started, so as to drive the Z-shaped flushing pipe to rotate around the annular filter screen by the meshing of the driving gear and the driven gear. In order to improve the flushing efficiency, a plurality of flushing nozzles 4 can be arranged on the water outlet pipe section 33 at intervals along the length direction of the pipe section.

[0049] In some possible implementation manners, the transition container 15 is further provided with an exhaust hole 153 and a cover plate 151 which can be opened and closed. The cover plate 151 is a part of the top cover of the transition container 15 and is hinged to the fixed part of the top cover of the transition container 15 through a hinge 152, so that the cover plate 151 can be opened and closed. When the cover plate 151 is opened, an observation window is formed on the top of the transition container 15, so that the staff can view the water outlet condition in the transition container 15 and the clogging and flushing unblocking condition of the filter screen in real time. In addition, the cover plate 151 can be opened to replace or maintain the flushing pipe, the flushing nozzle and the like, thereby increasing the use flexibility and convenience of the equipment.

[0050] In some possible implementation manners, the coagulation and sedimentation outlet 13 is further connected with a coagulation and sedimentation discharge pipe 18 which is inclined downward and is used to be connected with the sludge inlet of the sludge dewatering equipment. The coagulation and sedimentation discharge pipe 18 is inclined downward, which is beneficial to the smooth discharge of the coagulation and sedimentation by gravity and can avoid the sludge clogging of the coagulation and sedimentation outlet 13.

[0051] In some feasible implementations, the sewage inlet 11 can be connected to multiple sewage inlet pipes simultaneously, and each sewage inlet pipe is equipped with a connecting flange 19. The connecting flange 19 is used to connect to a sewage supply pipeline (the sewage to be treated is transported to the sewage inlet 11 through this sewage supply pipeline). Figure 1 As shown, the sewage inlet 11 is connected to two coaxially arranged sewage inlet pipes, forming a two-way structure. Sewage can be simultaneously transported into the container through the two sewage inlet pipes, which can increase the sewage treatment capacity.

[0052] In some feasible embodiments, the bottom of the tank 14 is also provided with support legs 17 to support the tank 14 above the ground. Two support legs 17 may be symmetrically arranged, or three to five may be evenly arranged around the circumference of the tank 14.

[0053] The aforementioned pre-coagulation device 100 for sludge dewatering is mainly used in sludge dewatering treatment. During operation, wastewater enters the device through a wastewater supply pipeline, and coagulant is injected through a dosing port on the pipeline, achieving pre-mixing of the coagulant and wastewater before they enter the tank 14. After entering the tank 14, the coagulant and wastewater flow from bottom to top. During this flow, the wastewater and coagulant react fully to form flocs (i.e., coagulation sedimentation). Wastewater containing flocs overflows from the top of the tank 14. The heavier flocs flow from the coagulation sedimentation outlet 13 into the sludge dewatering equipment 200. The supernatant is filtered by an annular filter and discharged from the supernatant outlet 12 to the equalization tank 300. A timed, intermittently activated rotary drive mechanism can flush the sludge and other suspended solids accumulated during the annular filter filtration process from the outside in.

[0054] Compared to simple coagulation pipelines or coagulation tanks, the aforementioned pre-coagulation device 100 for sludge dewatering adds sludge filtration and cement diversion functions, thereby increasing the processing capacity of the sludge dewatering equipment. Under the same wastewater treatment capacity, it can reduce the operating energy consumption of the sludge dewatering equipment 200, reduce the investment and operating costs of the sludge treatment process, and achieve the goal of cost reduction and efficiency improvement.

[0055] Example 2

[0056] like Figure 3 As shown, this embodiment proposes a sludge dewatering line, including a sludge dewatering device 200 and a pre-coagulation device 100 for sludge dewatering in Embodiment 1. The pre-coagulation device 100 for sludge dewatering is connected to the sludge inlet of the sludge dewatering device 200 through a coagulation sedimentation outlet 13.

[0057] The sludge dewatering line also includes an equalization tank 300, with the supernatant outlet 12 connected to the equalization tank 300. The equalization tank 300 is a common structure in the field and will not be described in detail here.

[0058] The sewage enters the device through the sewage supply pipeline, the coagulant is injected through the dosing port arranged on the sewage supply pipeline, the pre-mixing of the coagulant and the sewage before entering the tank body 14 is realized, the coagulant and the sewage flow from bottom to top after entering the tank body 14, in the flowing process, the sewage and the coagulant fully react to form alum flowers (i.e. coagulation and precipitation), the sewage with the alum flowers flows over from the top of the tank body 14, the alum flowers with a higher specific gravity flow into the sludge dewatering equipment 200 from the coagulation and precipitation outlet 13, and the supernatant is discharged to the adjusting tank 300 from the supernatant outlet 12 after being filtered by the annular filter screen. The rotating driving mechanism is started at regular time intervals, and the accumulated sludge and other suspended matters in the filtering process of the annular filter screen are flushed from outside to inside.

[0059] Compared with a simple coagulation pipeline or coagulation tank, the pre-coagulation device 100 for sludge dewatering has the functions of filtering sludge and diverting water and cement, so that the processing capacity of the sludge dewatering equipment is improved. Under the premise of the same sewage processing capacity, the operation energy consumption of the sludge dewatering equipment 200 can be reduced, the investment cost and operation cost of the sludge treatment process section are reduced, and the purpose of reducing cost and increasing benefit is achieved.

[0060] It should be understood that the structures, proportions, sizes and the like shown in the drawings of the specification are only used to cooperate with the disclosed content, to enable those skilled in the art to understand and read, and are not used to limit the implementation conditions of the present application, so they do not have technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the present application, should still fall within the scope covered by the disclosed technical content. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the specification are only used for clear description, and are not used to limit the implementation range of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the implementation scope of the present application.

[0061] The principles and implementation modes of the present application are described by using specific examples in the present application, and the above examples are only used to help understand the method and core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range can be changed. In conclusion, the content of the specification should not be understood as a limitation of the present application.

Claims

1. A pre-coagulation device for sludge dewatering, characterized in that, include: A wastewater container is used to provide a reaction site for the coagulation process before sludge dewatering. The wastewater container has a wastewater inlet at the bottom and a supernatant outlet and a coagulation sedimentation outlet at the top. The coagulation sedimentation outlet is lower than the supernatant outlet so that the coagulation sediment can be discharged to the sludge dewatering equipment. The supernatant outlet is used to discharge the supernatant after coagulation. A filtration device is installed at the outlet of the supernatant to filter and intercept the coagulation and sedimentation in the supernatant before the supernatant is discharged.

2. The pre-coagulation device for sludge dewatering according to claim 1, characterized in that, The wastewater container includes: A vertically arranged tank, wherein the wastewater inlet is provided at the bottom of the tank, the filter device is provided on the top side wall of the tank, the top of the tank is closed or allows wastewater to overflow, and the coagulation and sedimentation outlet is provided on the top side wall of the tank, and the coagulation and sedimentation outlet is lower than the filter device. A transition container is fitted onto the top outside of the tank to enclose the filtration device. The transition container is higher than the coagulation and sedimentation outlet. A closed water storage cavity is formed between the transition container and the top of the tank. The closed water storage cavity is used to temporarily store the supernatant after filtration by the filtration device. The supernatant outlet is located on the transition container and communicates with the closed water storage cavity.

3. The pre-coagulation device for sludge dewatering according to claim 2, characterized in that, The filtration device is an annular filter capable of intercepting the coagulation and sedimentation. The annular filter is embedded in the top side wall of the tank, or the annular filter is integrally formed on the top side wall of the tank, or the top side wall of the tank has a water outlet hole, and the annular filter is wrapped around the outer or inner wall of the water outlet hole area of ​​the tank.

4. The pre-coagulation device for sludge dewatering according to claim 3, characterized in that, It also includes a filter washing mechanism, which comprises: A flushing pipe is disposed inside the transition container and located outside the annular filter screen; the inlet end of the flushing pipe is used to connect to the flushing water source, and the outlet end of the flushing pipe is provided with an outlet facing the annular filter screen. A rinsing nozzle is located at the water outlet and is used to spray rinsing water onto the annular filter screen.

5. The pre-coagulation device for sludge dewatering according to claim 4, characterized in that, The filter washing mechanism further includes a rotary drive mechanism, which is disposed on the transition container; The flushing pipe is a Z-shaped flushing pipe, which includes an inlet pipe section, a connecting pipe section, and an outlet pipe section connected in sequence. The outlet pipe section is located outside the annular filter screen, and the flushing nozzle is located on the side of the outlet pipe section facing the annular filter screen. The inlet pipe section passes through the top of the transition container and is rotatably engaged with the transition container. The inlet pipe section is used to connect to the flushing water source through a rotary joint. The rotary drive mechanism is connected to the outer wall of the inlet pipe section and is used to drive the Z-shaped flushing pipe to rotate around the inlet pipe section so as to use the outlet pipe section to rotate and flush the annular filter screen.

6. The pre-coagulation device for sludge dewatering according to any one of claims 2 to 5, characterized in that, The transition container is also provided with an exhaust port.

7. The pre-coagulation device for sludge dewatering according to any one of claims 2 to 5, characterized in that, The transition container is also equipped with an openable and closable cover.

8. The pre-coagulation device for sludge dewatering according to any one of claims 1 to 5, characterized in that, The coagulation sedimentation outlet is also connected to a downward-sloping coagulation sedimentation discharge pipe, which is used to connect to the sludge inlet of the sludge dewatering equipment.

9. The pre-coagulation device for sludge dewatering according to any one of claims 1 to 5, characterized in that, The sewage inlet is connected to multiple sewage inlet pipes, and each sewage inlet pipe is equipped with a connecting flange for connecting to the sewage supply pipeline.

10. The pre-coagulation device for sludge dewatering according to any one of claims 2 to 5, characterized in that, The bottom of the tank is also provided with support legs to support the tank above the ground.

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