Raw water pretreatment system and pretreatment method

Abstract

The invention provides a raw water pretreatment system which comprises a flocculation zone, a plug flow zone, a settling zone and a filtering zone which are communicated in sequence, the settling zone comprises a settling pond, a sediment discharging device and a sediment discharging auxiliary device, the sediment discharging device is located at the bottom of the settling pond, the sediment discharging auxiliary device is located in the settling pond, and the bottom of the inner side of the settling pond is of a hopper-shaped structure; the sediment discharge auxiliary device comprises a placing cavity, a connecting cavity, a rotating motor, a rotating roller, a plurality of sliding rods, a moving block, a plurality of springs, a plurality of connecting rods, a connecting block and a separator, and the placing cavity is located at the top of the inner side of the sedimentation tank and connected with the sedimentation tank. According to the invention, the bottom and the upper part of the sedimentation tank are effectively separated in the sediment discharge process by arranging the display board of the separator, so that sediment resuspension and disturbance caused by water flow or discharge operation are avoided, and sediment discharge is more sufficient.

Description

Technical Field

[0001] The present invention relates to the technical field of raw water pretreatment, and in particular to a raw water pretreatment system and a pretreatment method. Background Art

[0002] Raw water pretreatment is a key link in the water treatment process, which mainly includes flocculation, sedimentation and filtration. In the sedimentation stage, the suspended matter and solid particles in the water are removed by sedimentation tanks. However, the existing raw water pretreatment methods usually rely on static sedimentation tanks, manual or mechanical cleaning methods to discharge sediments. When discharging sediments, the sediments at the bottom of the pool are often easily disturbed, causing the sediments to re-float or be incompletely discharged. This phenomenon not only affects the removal effect of sediments, but may also cause secondary pollution, further reducing the efficiency of water treatment. Summary of the invention

[0003] Based on the above background, the purpose of the present invention is to provide a raw water pretreatment system and pretreatment method that prevents the disturbance of sediment at the bottom of the sedimentation tank and avoids the sediment from refloating or incompletely discharged, so as to solve the problems described in the background technology.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] A raw water pretreatment system comprises a flocculation zone, a flow-pushing zone, a sedimentation zone and a filtration zone, wherein the flocculation zone, the flow-pushing zone, the sedimentation zone and the filtration zone are sequentially connected;

[0006] The sedimentation area includes a sedimentation tank, a sediment discharge device and a sediment discharge auxiliary device, wherein the sediment discharge device is located at the bottom of the sedimentation tank, the sediment discharge auxiliary device is located inside the sedimentation tank, and the bottom inside the sedimentation tank is a bucket-shaped structure;

[0007] The sediment discharge auxiliary device comprises a placement chamber, a connection chamber, a rotating motor, a rotating roller, a plurality of sliding rods, a moving block, a plurality of springs, a plurality of connecting rods, a connecting block and an isolating member, wherein the placement chamber is located at the top of the inner side of the sedimentation tank, the placement chamber is connected to the sedimentation tank, the connecting chamber is located at the bottom of the placement chamber, and the connecting chamber is communicated with the placement chamber;

[0008] The rotating motor is located inside the placement cavity, the rotating motor is connected to the placement cavity, and the rotating roller, the plurality of sliding rods, the moving block and the plurality of springs are all located inside the connection cavity;

[0009] One end of the roller is connected to the rotating end of the rotating motor; a spiral groove is provided on the surface of the roller, a slider is provided on the moving block, the slider corresponds to the groove, the slider is connected to the moving block, and the moving block and the roller are slidably matched through the slider and the groove;

[0010] A plurality of sliding rods are distributed circumferentially on the outer side of the rotating roller, two ends of the sliding rods are connected to the connecting cavity, a plurality of openings are provided on the outer edge of the moving block, the openings correspond to the sliding rods one by one, and the moving block slides with the sliding rods through the openings;

[0011] A plurality of springs are arranged on the upper part of the moving block, the springs correspond to the sliding rods one by one, the springs are sleeved outside the sliding rods, and the two ends of the springs are connected to the moving block and the connecting cavity respectively;

[0012] A plurality of connecting rods are arranged at the lower part of the moving block, the top of the connecting rod is connected to the moving block, the bottom of the connecting rod is connected to the connecting block, a connecting isolator is arranged on the side of the connecting block away from the connecting rod, and the isolator has two states: unfolded and folded.

[0013] Preferably, the isolation member includes a plurality of frames, elastic components and a plurality of display boards, the plurality of frames are circumferentially distributed at equal distances at the bottom of the connecting block, the frames are hinged to the connecting block, an elastic component is arranged between the frames and the connecting block, the elastic component is located on the side of the frame away from the middle of the connecting block, the two ends of the elastic component are respectively connected to the frames and the connecting block, display boards are arranged between adjacent frames, and the display boards are connected to the frames.

[0014] Preferably, the flocculation zone comprises a flocculation tank and a stirring device, wherein the stirring device is located inside the flocculation tank and is connected to the flocculation tank;

[0015] The plug flow area includes a plug flow box and a plug flow channel arranged in a serpentine shape, wherein the plug flow channel is located inside the plug flow box and is connected to the plug flow box;

[0016] The filter area includes a filter pool and a plurality of filter plates. The filter plates are located inside the filter pool and are connected to the filter pool.

[0017] Preferably, the sediment discharge device comprises a pump body and a discharge channel, the inlet end of the pump body is connected to the bottom of the sedimentation tank, and the outlet end of the pump body is connected to the discharge pipe.

[0018] Preferably, a sealing plate is provided between the placement cavity and the connection cavity.

[0019] Preferably, the plurality of slide grooves are circumferentially distributed at equal distances on the surface of the roller.

[0020] Preferably, the number of the sliding rods is at least two.

[0021] A raw water pretreatment method, comprising:

[0022] S1. Introduce raw water into the flocculation tank in the flocculation area, and use flocculants to flocculate the suspended matter in the water under the action of the stirring device;

[0023] S2. The raw water after flocculation treatment flows into the plug flow area. The plug flow channels arranged in a serpentine pattern in the plug flow box evenly push the raw water flow to ensure that the raw water does not disturb the sediment in the sedimentation tank when entering the sedimentation area.

[0024] S3, the raw water enters the sedimentation tank, and the sediment gradually settles to the bottom of the sedimentation tank under the action of gravity;

[0025] S4. When the sediment settles to a set amount, the rotating motor in the sediment discharge auxiliary device drives the roller, and the spiral chute on the surface of the roller guides the moving block to move downward, indirectly pushing the connecting rod and the connecting block to move downward. During the movement of the connecting block, the frame of the isolation piece slowly leaves the connecting cavity from bottom to top, and the frame stretches outward under the action of the elastic component, and the display panels between the frames are unfolded, and the display panels separate the bottom of the sedimentation tank from the upper part;

[0026] S5. Start the sediment discharge device at the bottom of the sedimentation tank to discharge the sediment out of the system through the pump body and the discharge channel;

[0027] S6. While the sediment is being discharged, the display board continues to move downward until it approaches the bottom surface of the sedimentation tank, waiting for the sediment to be completely discharged;

[0028] S7. After the sediment is discharged, the rotating motor drives the roller in the reverse direction. The spiral groove on the surface of the roller guides the moving block to move upward, indirectly pulling the connecting rod and the connecting block to move upward. During the movement of the connecting block, the frame of the isolation piece slowly enters the connecting cavity from top to bottom, and the display panels between the frames are retracted;

[0029] S8. The water after sedimentation treatment enters the filtration area, and the filter plates in the filter tank filter out the remaining suspended matter in the water.

[0030] Compared with the prior art, the present invention has the following advantages:

[0031] The present invention effectively separates the bottom of the sedimentation tank from the upper part during sediment discharge through the display board design of the isolation piece, thereby avoiding sediment resuspension and disturbance caused by water flow or discharge operation, and making sediment discharge more sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the structure of the sediment discharge auxiliary device of the present invention.

[0035] In the figure: 1, flocculation zone; 101, flocculation tank; 102, stirring device; 2, push flow zone; 201, push flow box; 202, push flow channel; 3, sedimentation zone; 301, sedimentation tank; 302, sediment discharge device; 302-1, pump body; 302-2, discharge channel; 303, sediment discharge auxiliary device; 303-1, placement chamber; 303-2, connecting chamber; 303-3, rotating motor; 303-4, roller; 303-5, sliding rod; 303-6, moving block; 303-7, spring; 303-8, connecting rod; 303-9, connecting block; 303-10, isolation piece; 303-10-1, frame; 303-10-2, elastic component; 303-10-3, display board; 4, filtration zone; 401, filtration tank; 402, filtration plate. DETAILED DESCRIPTION

[0036] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings. It should be understood that the implementation of the present invention is not limited to the following embodiments, and any form of modification and / or change made to the present invention will fall within the protection scope of the present invention.

[0037] In the present invention, unless otherwise specified, all parts and percentages are weight units, and the equipment and raw materials used can be purchased from the market or are commonly used in the art. The methods in the following embodiments, unless otherwise specified, are conventional methods in the art. The components or equipment in the following embodiments, unless otherwise specified, are universal standard parts or components known to those skilled in the art, and their structures and principles are known to those skilled in the art through technical manuals or conventional experimental methods.

[0038] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present invention. However, one or more embodiments may also be implemented by those skilled in the art without these specific details.

[0039] like Figure 1 As shown, a raw water pretreatment system includes a flocculation zone 1, a plug flow zone 2, a sedimentation zone 3 and a filtration zone 4, and the flocculation zone 1, the plug flow zone 2, the sedimentation zone 3 and the filtration zone 4 are connected in sequence.

[0040] During the pretreatment process, the raw water passes through the flocculation zone 1, the plug flow zone 2, the sedimentation zone 3 and the filtration zone 4 respectively.

[0041] The flocculation zone 1 includes a flocculation tank 101 and a stirring device 102 . The stirring device 102 is located inside the flocculation tank 101 , and the stirring device 102 is connected to the flocculation tank 101 .

[0042] In the flocculation zone 1, the stirring device 102 disperses the flocculant evenly into the water by continuously stirring the water in the flocculation tank 101, ensuring that the flocculant is in full contact with the suspended particles and colloidal substances in the water, and under the action of stirring, the fine particles in the water gradually gather into larger flocs with faster settling speed. Among them, the rotation speed and stirring time of the stirring device 102 are set to be adjustable, so as to achieve precise control of the flocculation process, ensure that the reaction between the particles and the flocculant achieves the best effect, prevent insufficient stirring, incomplete reaction between the flocculant and the particles, resulting in insufficient floc formation, affecting the water purification effect, or excessive stirring causes the flocs that have been formed to be broken up, resulting in secondary suspension.

[0043] The plug flow area 2 includes a plug flow box 201 and a plug flow channel 202 arranged in a serpentine shape. The plug flow channel 202 is located inside the plug flow box 201 , and the plug flow channel 202 is connected to the plug flow box 201 .

[0044] The push flow channel 202 in the push flow box 201 is arranged in a serpentine manner, so that the raw water flow can experience a certain degree of bending and speed change before entering the sedimentation area 3 from the flocculation area 1, thereby helping to maintain the uniformity of the raw water flow, reduce the impact force of the raw water entering the sedimentation tank 301, reduce the interference of the water flow on the sediment in the sedimentation tank 301, and prevent the sediment from being disturbed or re-suspended.

[0045] The sedimentation area 3 includes a sedimentation tank 301, a sediment discharge device 302 and a sediment discharge auxiliary device 303. The sediment discharge device 302 is located at the bottom of the sedimentation tank 301, and the sediment discharge auxiliary device 303 is located inside the sedimentation tank 301. The bottom of the inner side of the sedimentation tank 301 is a bucket-shaped structure.

[0046] The sediment discharge device 302 includes a pump body 302-1 and a discharge channel 302-2. The inlet end of the pump body 302-1 is connected to the bottom of the sedimentation tank 301, and the outlet end of the pump body 302-1 is connected to the discharge pipe.

[0047] When the water flows into the sedimentation tank 301, the solid particles in the water gradually settle to the bottom of the tank under the action of gravity. The bucket-shaped structure at the bottom of the sedimentation tank 301 helps to collect the sediment and guide it to the entrance of the sediment discharge device 302. The sediment discharge device 302 is composed of a pump body 302-1 and a discharge channel 302-2. The inlet end of the pump body 302-1 is connected to the bottom of the sedimentation tank 301, and the outlet end of the pump body 302-1 is connected to the outside of the system through a discharge pipe. Under the action of the pump body 302-1, the sediment accumulated at the bottom of the sedimentation tank 301 can be timely extracted and discharged from the system.

[0048] like Figure 2 As shown, the sediment discharge auxiliary device 303 includes a placement chamber 303-1, a connecting chamber 303-2, a rotating motor 303-3, a roller 303-4, several sliding rods 303-5, a moving block 303-6, several springs 303-7, several connecting rods 303-8, a connecting block 303-9 and an isolation member 303-10. The placement chamber 303-1 is located at the top of the inner side of the sedimentation tank 301, and the placement chamber 303-1 is connected to the sedimentation tank 301. The connecting chamber 303-2 is located at the bottom of the placement chamber 303-1, and the connecting chamber 303-2 is connected to the placement chamber 303-1.

[0049] The rotating motor 303-3 is located inside the placement chamber 303-1, and the rotating motor 303-3 is connected to the placement chamber 303-1. The roller 303-4, several sliding rods 303-5, the moving block 303-6 and several springs 303-7 are all located inside the connecting chamber 303-2. A sealing plate is set between the placement chamber 303-1 and the connecting chamber 303-2.

[0050] While discharging the sediment, the sediment discharge auxiliary device 303 will separate the bottom of the sedimentation tank 301 from the upper part of the sedimentation tank 301, avoiding the re-suspension and disturbance of the sediment caused by the water flow or the discharge operation, so that the sediment discharge is more sufficient. Among them, the placement chamber 303-1 of the sediment discharge auxiliary device 303 is located at the top of the inner side of the sedimentation tank 301 and is connected to the sedimentation tank 301, and can be used to place the rotating motor 303-3. The connecting chamber 303-2 is located at the bottom of the placement chamber 303-1 and is connected to the placement chamber 303-1, and can be used to place the roller 303-4, the sliding rod 303-5 and the moving block 303-6 and other components. A sealing plate is set between the placement chamber 303-1 and the connecting chamber 303-2, which can prevent the raw water in the sedimentation tank 301 from entering the placement chamber 303-1 and protect the rotating motor 303-3 inside it.

[0051] One end of the roller 303-4 is connected to the rotating end of the rotating motor 303-3. A spiral groove is provided on the surface of the roller 303-4, and several grooves are equidistantly distributed circumferentially on the surface of the roller 303-4. The moving block 303-6 is provided with a slider, the slider corresponds to the groove, the slider is connected to the moving block 303-6, and the moving block 303-6 and the roller 303-4 are slidably matched through the slider and the groove.

[0052] Several sliding rods 303-5 are distributed circumferentially on the outer side of the roller 303-4, and the number of sliding rods 303-5 is at least two. Both ends of the sliding rods 303-5 are connected to the connecting cavity 303-2. Several openings are provided on the outer edge of the moving block 303-6, and the openings correspond to the sliding rods 303-5 one by one. The moving block 303-6 slides and cooperates with the sliding rods 303-5 through the openings.

[0053] A plurality of springs 303-7 are arranged on the upper part of the moving block 303-6. The springs 303-7 correspond to the sliding rods 303-5 one by one. The springs 303-7 are sleeved on the outside of the sliding rods 303-5. The two ends of the springs 303-7 are respectively connected to the moving block 303-6 and the connecting cavity 303-2.

[0054] Several connecting rods 303-8 are set at the lower part of the moving block 303-6. The top of the connecting rod 303-8 is connected to the moving block 303-6, and the bottom of the connecting rod 303-8 is connected to the connecting block 303-9. A connecting isolation piece 303-10 is set on the side of the connecting block 303-9 away from the connecting rod 303-8. The isolation piece 303-10 has two states: unfolded and folded.

[0055] When the sediment discharge auxiliary device 303 is working, the power of the rotating motor 303-3 drives the roller 303-4 connected to it to rotate, so that the slider is pushed in the spiral groove on the surface of the roller 303-4. Since the slider is connected to the moving block 303-6, and several sliding rods 303-5 are evenly distributed on the outside of the roller 303-4, the moving block 303-6 on the sliding rod 303-5 slides with the sliding rod 303-5 through the opening, so that the moving block 303-6 can move in the up and down directions.

[0056] When the moving block 303-6 slowly pushes the connecting rod 303-8 downward, thereby indirectly pushing the connecting block 303-9 to move downward, until the connecting block 303-9 leaves the connecting cavity 303-2, the isolation piece 303-10 at the bottom of the connecting block 303-9 will slowly expand to separate the bottom of the sedimentation tank 301 from the upper part of the sedimentation tank 301. When the moving block 303-6 slowly pulls the connecting rod 303-8 upward, thereby indirectly pulling the connecting block 303-9 to move upward, until the connecting block 303-9 enters the connecting cavity 303-2, the isolation piece 303-10 at the bottom of the connecting block 303-9 will slowly retract to prevent blocking the bottom of the sedimentation tank 301 and preventing sediment from settling.

[0057] The isolation member 303-10 includes several frames 303-10-1, elastic components 303-10-2 and several display panels 303-10-3. The several frames 303-10-1 are circumferentially distributed at equal distances at the bottom of the connecting block 303-9. The frames 303-10-1 are hinged to the connecting block 303-9. The elastic components 303-10-2 are arranged between the frames 303-10-1 and the connecting block 303-9. The elastic components 303-10-2 are located on the side of the frames 303-10-1 away from the middle of the connecting block 303-9. The two ends of the elastic components 303-10-2 are respectively connected to the frames 303-10-1 and the connecting block 303-9. Display panels 303-10-3 are arranged between adjacent frames 303-10-1, and the display panels 303-10-3 are connected to the frames 303-10-1.

[0058] The connecting block 303-9 is connected to the frame 303-10-1 through the elastic component 303-10-2. When the connecting block 303-9 leaves the connecting cavity 303-2, the elastic component 303-10-2 provides a tensile force for the frame 303-10-1, prompting the frame 303-10-1 to expand outward. As the frame 303-10-1 expands, the display panels 303-10-3 between the frames 303-10-1 are also stretched open, thereby forming an isolation barrier. When the connecting block 303-9 returns to the connecting cavity 303-2, part of the frame 303-10-1 will also enter the connecting cavity 303-2, and the connecting cavity 303-2 will push the outside of the frame 303-10-1 to retract the frame 303-10-1. The display panels 303-10-3 between the frames 303-10-1 will also fold as the frames 303-10-1 are retracted, thereby returning to their original state.

[0059] The filter area 4 includes a filter pool 401 and a plurality of filter plates 402 . The filter plates 402 are located inside the filter pool 401 , and the filter plates 402 are connected to the filter pool 401 .

[0060] The raw water passing through the sedimentation area 3 has had its large particles of impurities removed, but may still contain relatively fine suspended matter and particles, which enter the filtration area 4 along the channel. The filter pool 401 of the filtration area 4 guides the water flow to be evenly distributed on a plurality of filter plates 402, and the filter plates 402 intercept small particles and suspended matter in the water through their pores. In addition, the filter plates 402 are multi-layered, and each layer of the filter plates 402 has a structure with different pore sizes, which can grade and filter the water flow according to the size of the particles, thereby increasing the contact area between the water flow and the filter material, and effectively retaining the particles.

[0061] A raw water pretreatment method, comprising:

[0062] S1, introducing raw water into the flocculation tank 101 of the flocculation zone 1, and using a flocculant to flocculate the suspended matter in the water under the action of the stirring device 102;

[0063] S2, the raw water after flocculation treatment flows into the plug flow area 2, and the plug flow channels 202 arranged in a serpentine shape in the plug flow box 201 evenly push the raw water flow to ensure that the raw water does not interfere with the sediment in the sedimentation tank 301 when entering the sedimentation area 3;

[0064] S3, the raw water enters the sedimentation tank 301, and the sediment gradually settles to the bottom of the sedimentation tank 301 under the action of gravity;

[0065] S4. When the sediment is settled to a set amount, the rotating motor 303-3 in the sediment discharge auxiliary device 303 drives the roller 303-4. The spiral groove on the surface of the roller 303-4 guides the moving block 303-6 to move downward, indirectly pushing the connecting rod 303-8 and the connecting block 303-9 to move downward. During the movement of the connecting block 303-9, the frame 303-10-1 of the isolation member 303-10 slowly leaves the connecting cavity 303-2 from bottom to top. Under the action of the elastic component 303-10-2, the frame 303-10-1 stretches outward, and the display panels 303-10-3 between the frames 303-10-1 are unfolded, and the display panels 303-10-3 separate the bottom and the upper part of the sedimentation tank 301;

[0066] S5, start the sediment discharge device 302 at the bottom of the sedimentation tank 301, and discharge the sediment out of the system through the pump body 302-1 and the discharge channel 302-2;

[0067] S6, while the sediment is discharged, the display board 303-10-3 continues to move downward until the display board 303-10-3 is close to the bottom surface of the sedimentation tank 301, waiting for the sediment to be completely discharged;

[0068] S7. After the sediment is discharged, the rotating motor 303-3 drives the roller 303-4 in the reverse direction. The spiral groove on the surface of the roller 303-4 guides the moving block 303-6 to move upward, indirectly pulling the connecting rod 303-8 and the connecting block 303-9 to move upward. During the movement of the connecting block 303-9, the frame 303-10-1 of the isolation member 303-10 slowly enters the connecting cavity 303-2 from top to bottom, and the display board 303-10-3 between the frames 303-10-1 is retracted;

[0069] S8. The water after sedimentation treatment enters the filtration area 4, and the filter plate 402 in the filter pool 401 filters out the remaining suspended matter in the water.

[0070] The implementation principle of a raw water pretreatment system and pretreatment method of the present invention is:

[0071] First, the raw water passes through the flocculation zone 1. With the help of the stirring device 102, the flocculant fully contacts the suspended particles in the water, so that the particles are aggregated into larger particles. Then, the raw water passes through the flow-pushing zone 2. The serpentine flow-pushing channel 202 in the flow-pushing zone 2 pushes the raw water evenly, so that the raw water flow remains stable before entering the sedimentation zone 3. When the raw water reaches the sedimentation tank 301, the particles are settled to the bottom of the tank by gravity, and the sediment discharge device 302 discharges these sediments from the system in time. Before discharging the sediment, the sediment discharge auxiliary device 303 isolates the bottom and upper part of the sedimentation tank 301 through the unfolded isolation piece 303-10 to prevent the sediment from being re-suspended when discharged. Then, the sediment discharge device 302 is opened to discharge the sediment at the bottom of the sedimentation tank 301. After the sediment is discharged from the system, the sediment discharge auxiliary device 303 returns to its original state. Finally, the water treated by sedimentation in the sedimentation tank 301 reaches the filtration area 4, and the filter plate 402 filters the remaining fine particles in the raw water through a multi-layer design and a structure with different pore sizes, thereby completing the pretreatment of the raw water.

[0072] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A raw water pretreatment system, characterized in that: The raw water pretreatment system comprises a flocculation zone (1), a plug flow zone (2), a sedimentation zone (3) and a filtration zone (4), wherein the flocculation zone (1), the plug flow zone (2), the sedimentation zone (3) and the filtration zone (4) are sequentially connected; The sedimentation area (3) comprises a sedimentation tank (301), a sediment discharge device (302) and a sediment discharge auxiliary device (303), wherein the sediment discharge device (302) is located at the bottom of the sedimentation tank (301), and the sediment discharge auxiliary device (303) is located inside the sedimentation tank (301), and the bottom of the inner side of the sedimentation tank (301) is a bucket-shaped structure; The sediment discharge auxiliary device (303) comprises a placement chamber (303-1), a connection chamber (303-2), a rotating motor (303-3), a roller (303-4), a plurality of sliding rods (303-5), a moving block (303-6), a plurality of springs (303-7), a plurality of connecting rods (303-8), a connecting block (303-9) and an isolating member (303-10); the placement chamber (303-1) is located at the top of the inner side of the sedimentation tank (301); the placement chamber (303-1) is connected to the sedimentation tank (301); the connecting chamber (303-2) is located at the bottom of the placement chamber (303-1); and the connecting chamber (303-2) is in communication with the placement chamber (303-1); The rotating motor (303-3) is located inside the placement cavity (303-1), the rotating motor (303-3) is connected to the placement cavity (303-1), and the rotating roller (303-4), a plurality of sliding rods (303-5), a moving block (303-6) and a plurality of springs (303-7) are all located inside the connection cavity (303-2); One end of the rotating roller (303-4) is connected to the rotating end of the rotating motor (303-3); a spiral groove is provided on the surface of the rotating roller (303-4); a slider is provided on the moving block (303-6); the slider corresponds to the groove; the slider is connected to the moving block (303-6); the moving block (303-6) and the rotating roller (303-4) are slidably matched via the slider and the groove; A plurality of sliding rods (303-5) are distributed circumferentially on the outer side of the rotating roller (303-4), two ends of the sliding rods (303-5) are connected to the connecting cavity (303-2), a plurality of openings are provided on the outer edge of the moving block (303-6), the openings correspond to the sliding rods (303-5) one by one, and the moving block (303-6) is slidably matched with the sliding rods (303-5) through the openings; A plurality of springs (303-7) are arranged on the upper part of the moving block (303-6), the springs (303-7) correspond to the sliding rods (303-5) one by one, the springs (303-7) are sleeved outside the sliding rod (303-5), and the two ends of the springs (303-7) are respectively connected to the moving block (303-6) and the connecting cavity (303-2); A plurality of connecting rods (303-8) are arranged at the lower part of the moving block (303-6); the top of the connecting rod (303-8) is connected to the moving block (303-6); the bottom of the connecting rod (303-8) is connected to the connecting block (303-9); a connecting isolating piece (303-10) is arranged on a side of the connecting block (303-9) away from the connecting rod (303-8); and the isolating piece (303-10) has two states: unfolded and folded.

2. The raw water pretreatment system according to claim 1, characterized in that: The isolating member (303-10) comprises a plurality of frames (303-10-1), elastic components (303-10-2) and a plurality of display panels (303-10-3), wherein the plurality of frames (303-10-1) are equidistantly distributed circumferentially at the bottom of the connecting block (303-9), the frame (303-10-1) is hinged to the connecting block (303-9), and the elastic components (303-1) are arranged between the frame (303-10-1) and the connecting block (303-9). 0-2), the elastic component (303-10-2) is located on one side of the frame (303-10-1) away from the middle of the connecting block (303-9), the two ends of the elastic component (303-10-2) are respectively connected to the frame (303-10-1) and the connecting block (303-9), and an exhibition board (303-10-3) is arranged between adjacent frames (303-10-1), and the exhibition board (303-10-3) is connected to the frame (303-10-1).

3. The raw water pretreatment system according to claim 1, characterized in that: The flocculation zone (1) comprises a flocculation tank (101) and a stirring device (102), wherein the stirring device (102) is located inside the flocculation tank (101), and the stirring device (102) is connected to the flocculation tank (101); The flow-pushing area (2) comprises a flow-pushing box (201) and a flow-pushing channel (202) arranged in a serpentine shape, wherein the flow-pushing channel (202) is located inside the flow-pushing box (201), and the flow-pushing channel (202) is connected to the flow-pushing box (201); The filtering area (4) comprises a filtering pool (401) and a plurality of filtering plates (402), wherein the filtering plates (402) are located inside the filtering pool (401), and the filtering plates (402) are connected to the filtering pool (401).

4. The raw water pretreatment system according to claim 1, characterized in that: The sediment discharge device (302) comprises a pump body (302-1) and a discharge channel (302-2), wherein the inlet end of the pump body (302-1) is connected to the bottom of the sedimentation tank (301), and the outlet end of the pump body (302-1) is connected to a discharge pipe.

5. The raw water pretreatment system according to claim 1, characterized in that: A sealing plate is provided between the placement cavity (303-1) and the connection cavity (303-2).

6. The raw water pretreatment system according to claim 1, characterized in that: The plurality of slide grooves are circumferentially distributed at equal distances on the surface of the roller (303-4).

7. The raw water pretreatment system according to claim 1, characterized in that: The number of the sliding rods (303-5) is at least two.

8. A method for pretreatment of raw water, characterized in that: include: S1, introducing raw water into the flocculation tank (101) of the flocculation zone (1), and using a flocculant to flocculate the suspended matter in the water under the action of a stirring device (102); S2, the raw water after flocculation treatment flows into the flow-pushing area (2), and the flow-pushing channels (202) arranged in a serpentine pattern in the flow-pushing box (201) push the raw water flow evenly, ensuring that the raw water does not interfere with the sediment in the sedimentation tank (301) when entering the sedimentation area (3); S3, the raw water enters the sedimentation tank (301), and the sediment gradually settles to the bottom of the sedimentation tank (301) under the action of gravity; S4. When the sediment is precipitated to a set amount, the rotating motor (303-3) in the sediment discharge auxiliary device (303) drives the roller (303-4), and the spiral groove on the surface of the roller (303-4) guides the moving block (303-6) to move downward, indirectly pushing the connecting rod (303-8) and the connecting block (303-9) to move downward. During the movement of the connecting block (303-9), the frame (303-10-1) of the isolation member (303-10) slowly leaves the connecting cavity (303-2) from bottom to top, and under the action of the elastic component (303-10-2), the frame (303-10-1) extends outward, and the display panels (303-10-3) between the frames (303-10-1) are unfolded, and the display panels (303-10-3) separate the bottom of the sedimentation tank (301) from the upper part; S5, starting the sediment discharge device (302) at the bottom of the sedimentation tank (301) to discharge the sediment out of the system through the pump body (302-1) and the discharge channel (302-2); S6. While the sediment is being discharged, the display board (303-10-3) continues to move downward until the display board (303-10-3) is close to the bottom surface of the sedimentation tank (301), waiting for the sediment to be completely discharged; S7, after the sediment is discharged, the rotating motor (303-3) drives the roller (303-4) in the reverse direction, and the spiral-shaped slide groove on the surface of the roller (303-4) guides the moving block (303-6) to move upward, indirectly pulling the connecting rod (303-8) and the connecting block (303-9) to move upward, and during the movement of the connecting block (303-9), the frame (303-10-1) of the isolation member (303-10) slowly enters the connecting cavity (303-2) from top to bottom, and the display board (303-10-3) between the frames (303-10-1) is retracted; S8. The water after the sedimentation treatment enters the filtration area (4), and the filter plate (402) in the filter pool (401) filters out the remaining suspended matter in the water.

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