A multi-stage sedimentation device for sewage treatment

Abstract

The present invention relates to the field of sewage treatment, and in particular to a multi-stage sedimentation device for sewage treatment. The equipment includes a collecting box, a feeding piece, a conveyor belt unit, a sedimentation channel, a sedimentation interception component and a sewage purification box. The collecting box is divided into a treatment chamber one, a treatment chamber two and a sedimentation chamber. The conveyor belt unit is located below the feeding piece, and its end extends into the treatment chamber one. The sedimentation channel is located in the sedimentation chamber. Multiple groups of sedimentation interception components are arranged along the water flow direction of the sedimentation channel. The present invention utilizes sedimentation interception sheets of different grades to filter and precipitate sewage layer by layer, and at the same time, the sedimentation interception sheets are moved to realize automatic replacement, cleaning and maintenance of the sedimentation interception sheets. Ultimately, efficient and coherent classification and recovery of waste resources in the sewage of tire and rubber workshops and sewage sedimentation treatment are realized, which is energy-saving and environmentally friendly, and is conducive to the green development of tires and rubber.

Description

Technical Field

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

[0002] During the tire rubber processing, wastewater is generated mainly from multiple processes, especially in key stages such as rubber mixing, molding and vulcanization, where a large amount of water and chemicals are used. These water and chemicals interact with rubber raw materials and other additives during the processing, thus generating wastewater. The wastewater composition of tire rubber workshops is relatively complex, mainly including the following categories:

[0003] Rubber whey: This is one of the main components in wastewater and comes from emulsion polymerization and other processes in the rubber production process.

[0004] Organic matter: The sewage contains a large amount of rubber dissolves and organic additives that are difficult to biodegrade, such as rubber particles, additives, dispersants, rubber dissolves, grease, etc. These organic matters make the sewage have high COD (chemical oxygen demand) and BOD (biological oxygen demand) values.

[0005] Sulfide: Sulfur, accelerators and other chemicals used in the vulcanization process, as well as steam condensate produced by heating, may contain sulfide in these wastewaters.

[0006] Inorganic salts: Sewage also contains a certain amount of inorganic salts, such as calcium chloride, iron sulfate, etc.

[0007] Suspended matter: Due to the cutting, grinding and other processes in the tire production process, there are a large number of particles and suspended matter in the wastewater.

[0008] Hazardous substances: Wastewater may also contain heavy metals, petroleum, surfactants and other harmful components.

[0009] The Chinese patent document with authorization announcement number CN208990307U relates to the technical field of sewage treatment devices, and discloses a mobile sewage treatment multi-stage sedimentation device, including a sedimentation body having a primary sedimentation tank, a secondary sedimentation tank and a tertiary sedimentation tank, and a plurality of lifting ears arranged on the top of the sedimentation body, the sedimentation body is formed with a water inlet, a first overflow port, a second overflow port and a water outlet; a water pump pumps untreated sewage into the primary sedimentation tank through the water inlet, and allows the sewage after sedimentation treatment in the primary sedimentation tank to enter the secondary sedimentation tank through the first overflow port, and allows the sewage after sedimentation treatment in the secondary sedimentation tank to enter the tertiary sedimentation tank through the second overflow port, and the sewage after sedimentation treatment in the tertiary sedimentation tank is discharged into the municipal pipe network through the water outlet; the first overflow port, the second overflow port and the water outlet are respectively located at the upper part of the sedimentation body.

[0010] The Chinese patent document with authorization announcement number CN219804332U provides a multi-stage sewage sedimentation purification device, including a multi-stage sedimentation box, a filter tank, and a guide tank; the multi-stage sedimentation box includes a primary sedimentation box, a secondary sedimentation box, a tertiary sedimentation box, and a disinfection box, and the disinfection box is connected to the water outlet of the tertiary sedimentation box. The filter tank includes filter tank one and filter tank two, and the filter tank one is arranged at the secondary sedimentation box and the tertiary sedimentation box close to the upper side wall, and the filter tank two is arranged at the side wall of the primary sedimentation box close to the secondary sedimentation box; the guide tank is arranged between filter tank one and filter tank two, connecting the adjacent side walls between filter tank one and filter tank two.

[0011] The existing multi-stage sedimentation technology mainly relies on physical separation to precipitate impurities in sewage. Therefore, the precipitation method is single, and the objects of precipitation are mainly some large-volume, sedimentable dirt. However, for the wastewater from the tire rubber processing process, its wastewater has the characteristics of high organic matter content, many harmful substances, many suspended solids, and large changes in water quality, which brings certain difficulties to sewage treatment. Therefore, it is necessary to adopt appropriate sewage treatment methods and technologies to ensure that sewage can be effectively treated and waste resources can be recycled. Summary of the invention

[0012] In view of the problems existing in the background technology, a multi-stage sedimentation device for sewage treatment is proposed, which uses sedimentation interception pieces of different levels to filter and precipitate sewage layer by layer, and at the same time, the sedimentation interception pieces are moved to realize automatic replacement, cleaning and maintenance of the sedimentation interception pieces. Finally, efficient and coherent classification and recycling of waste resources in the sewage of tire and rubber workshops and sewage sedimentation treatment are realized, which is energy-saving and environmentally friendly, and is conducive to the green development of tires and rubber.

[0013] The present invention provides a multi-stage sedimentation device for sewage treatment, comprising:

[0014] The collecting box is divided into a processing chamber 1 on the left, a processing chamber 2 on the upper right, and a sedimentation chamber on the lower right;

[0015] The feeding piece is located at the top of the treatment chamber 2 and intercepts large-volume debris in the wastewater of the tire rubber workshop;

[0016] A conveyor belt unit is located below the feed member, and the end of the discharge end extends into the treatment chamber 1 to separate and collect the rubber particles remaining in the wastewater of the tire rubber workshop;

[0017] The sedimentation channel is located in the sedimentation chamber, one end of which is connected to the water inlet tank for water intake, and the other end of which is connected to the water outlet tank for water discharge;

[0018] Sedimentation interception components, multiple groups are arranged along the water flow direction of the sedimentation channel, and the sedimentation interception end intercepts and precipitates pollutants in the wastewater of the tire rubber workshop in a graded manner;

[0019] And the sewage purification box is connected with the water outlet tank to collect, purify and process the remaining sewage.

[0020] Preferably, the feed member comprises a feed hopper extending into the processing chamber and located above the conveyor belt unit; a movable slag blocking frame is arranged at the feed end of the feed hopper; a slag blocking plate with a liquid leakage hole is arranged at the bottom of the slag blocking frame, and a handle is arranged on the side.

[0021] Preferably, a cleaning element for acting on the conveyor belt unit and a heating element for acting on the collected rubber particles are arranged in the second processing chamber.

[0022] Preferably, the sedimentation channel is hollow with two open ends, and the side walls are provided with opposite through grooves for the sedimentation interception end of the sedimentation interception assembly to pass through, and the internal space is divided into a plurality of sedimentation chambers.

[0023] Preferably, the sedimentation interception assembly includes sedimentation interception members arranged in pairs and located on both sides of the sedimentation channel; a sedimentation interception plate is arranged between the paired sedimentation interception members and passes through the sedimentation chamber through a through groove; the sedimentation interception member includes a mounting frame located in the sedimentation chamber; a winding shaft and two groups of cleaning rollers in a triangular position are arranged on the mounting frame; a cleaning frame is arranged on one side of each group of cleaning rollers; the cleaning frame is an arc-shaped structure with the concave surface facing the cleaning roller, and cleaning bristles are arranged between the cleaning roller and the corresponding cleaning frame; the sedimentation interception plate is located between the cleaning roller and the cleaning frame to form an S-shaped trend, and the end is wound around the winding shaft that rotates when powered.

[0024] Preferably, the sediment interception plate comprises a filtration zone at the upper end and an interception zone at the lower end; the filtration zone intercepts impurities whose size is larger than the filter holes; and the interception zone is used to store sediment.

[0025] Preferably, a corresponding discharge port is arranged at the bottom of the sedimentation chamber, and a vent is arranged at the top; a collecting pipe corresponding to the discharge port one by one is arranged on the collection box, and a vent pipe corresponding to the vent is also arranged one by one.

[0026] Preferably, it also includes a spray assembly acting on the sediment intercepting piece; the spray assembly includes a spray pipe located outside the sediment intercepting piece; the spray pipe sprays water toward between the winding shaft and the cleaning roller, and is connected to an external water tank through a pipeline.

[0027] Preferably, the top of the water inlet tank is connected to the second processing chamber, one side is connected to the sedimentation channel, and the other side is provided with a pressurizing device.

[0028] Preferably, one end of the water outlet box is connected to the sedimentation channel, and the other end is connected to the sewage purification box through the water outlet pipe, and an adsorbent is arranged inside.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects: the processing chamber 1, the processing chamber 2 and the sedimentation chamber are set to divide the internal space of the collection box, wherein the residual rubber and the sewage are separated in the processing chamber 1 through the feeding process of the conveyor belt unit, and the sewage enters the sedimentation chamber and is pressurized to pass through the sedimentation channel. By winding the sedimentation interception sheets of different grades on the corresponding winding shafts, covering the corresponding sedimentation chambers, the sewage passing through is filtered and intercepted layer by layer, and then the impurities in the sewage of the tire rubber workshop are collected respectively. In addition, by rotating the two sets of winding shafts one positive and one negative, the sedimentation interception sheet is moved, on the one hand, the sedimentation interception sheet is replaced to ensure its filtering effect, and on the other hand, the sedimentation interception sheet moving in and out moves between the cleaning roller and the cleaning frame, and is acted on by the cleaning bristles, and the spray pipe sprays water on the sedimentation interception sheet, further removing the dirt on the sedimentation interception sheet, realizing the automatic replacement, cleaning and maintenance of the sedimentation interception sheet, and ensuring the effect of separating different sediments. Finally, the remaining sewage is treated by adsorption and oxidation, and the purpose of deep purification has been achieved. By combining the above technical solutions, efficient and continuous classification and recovery of waste resources in the wastewater of tire and rubber workshops and wastewater sedimentation treatment can be achieved, which is energy-saving and environmentally friendly and is conducive to the green development of tire and rubber. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the multi-stage sedimentation device for sewage treatment in the present invention (viewing angle 1);

[0031] Figure 2 It is a structural schematic diagram of the multi-stage sedimentation device for sewage treatment in the present invention (viewing angle 2);

[0032] Figure 3 It is a schematic diagram of the structure of the multi-stage sedimentation device for sewage treatment in the present invention (viewing angle 3);

[0033] Figure 4 is a cross-sectional view of the collection box in the present invention;

[0034] Figure 5 It is a structural schematic diagram of the feeding member in the present invention;

[0035] Figure 6 It is a structural diagram of the cleaning member in the present invention;

[0036] Figure 7 It is a schematic diagram of the connection relationship between the sedimentation channel, the water inlet tank and the water outlet tank in the present invention;

[0037] Figure 8 It is a schematic diagram of the structure of the sedimentation channel and the sedimentation interception component in the present invention;

[0038] Fig. 9 It is a schematic diagram of the partial structure of the sedimentation interception component in the present invention;

[0039] Fig.10 for Figure 8 The enlarged schematic diagram at A in the middle;

[0040] Fig.11 for Figure 4 Enlarged diagram of point B in the middle

[0041] Fig.12 It is a structural schematic diagram of the water inlet tank in the present invention;

[0042] Fig.13 It is a structural schematic diagram of the water outlet tank in the present invention.

[0043] Figure numerals: 1, treatment chamber 1; 101, partition 1; 102, partition 2; 2, treatment chamber 2; 3, sewage purification box; 4, water tank; 5, feed piece; 501, feed hopper; 502, slag blocking frame; 503, slag blocking plate; 504, handle; 6, conveyor belt unit; 7, water inlet box; 701, pressurizing device; 8, sedimentation channel; 801, through slot; 802, discharge port; 803, vent; 9, water outlet box; 901, adsorbent; 10, water outlet pipe; 11, water pipe; 12, spray Shower assembly; 1201, spray pipe; 13, sedimentation interception assembly; 1301, sedimentation interception plate; 1301a, filtration area; 1301b, interception area; 1302, mounting frame; 1303, cleaning roller; 1304, cleaning frame; 1305, cleaning bristles; 1306, winding shaft; 14, cleaning piece; 1401, drive box; 1402, cleaning frame; 1403, cleaning strip; 15, sedimentation chamber; 16, discharge pipe; 17, collecting pipe; 18, heating element; 19, ventilation pipe. DETAILED DESCRIPTION

[0044] Embodiment 1, as Figure 1-Figure 4 As shown, a multi-stage sedimentation device for sewage treatment proposed by the present invention includes a collection box, a feed piece 5, a conveyor belt unit 6, a sedimentation channel 8, a sedimentation interception assembly 13 and a sewage purification box 3. The collection box is divided into a treatment chamber 1 on the left, a treatment chamber 2 on the upper right and a sedimentation chamber 15 on the lower right by a partition 101 and a partition 2 102; the treatment chamber 1 is connected to the treatment chamber 2 2; and the sedimentation chamber 15 is connected to the treatment chamber 2 2. The feed piece 5 is located at the top of the treatment chamber 2 2 to intercept large-volume debris in the sewage of the tire rubber workshop. The conveyor belt unit 6 is located below the feed piece 5, and the end of the discharge end extends into the treatment chamber 1 to separate and collect the rubber particles remaining in the sewage of the tire rubber workshop. The sedimentation channel 8 is located in the sedimentation chamber 15, one end of which is connected to the water inlet box 7 for water inlet, and the other end of which is connected to the water outlet box 9 for water outlet. Multiple groups of sedimentation interception assemblies 13 are arranged along the water flow direction of the sedimentation channel 8, and the sedimentation interception end intercepts and precipitates pollutants in the sewage of the tire rubber workshop in a graded manner. The sewage purification tank 3 is connected with the water outlet tank 9 to collect and purify the remaining sewage.

[0045] like Figure 5 As shown, the feed member 5 includes a feed hopper 501 extending into the processing chamber 1 and located above the conveyor belt unit 6; a movable slag blocking frame 502 is provided at the feed end of the feed hopper 501; a slag blocking plate 503 with a liquid leakage hole is provided at the bottom of the slag blocking frame 502, and a handle 504 is provided on the side.

[0046] The wastewater generated by the tire and rubber workshop is directly poured into the slag intercepting rack 502, and the wastewater is initially filtered by intercepting large-volume garbage.

[0047] like Figure 4 , Figure 6 As shown, a cleaning member 14 for acting on the conveyor belt unit 6 is provided in the processing chamber 2, and a heating member 18 for acting on the collected rubber particles is also provided. The cleaning member 14 includes a driving box 1401 (which may be a cylinder, a linear module, etc.) located on the inner wall of the processing chamber 2; a cleaning frame 1402 for horizontal movement along the bottom of the conveyor belt is provided on the driving end of the driving box 1401; a cleaning strip 1403 in contact with the conveyor belt is provided on the cleaning frame 1402; during the rotation of the conveyor belt, the cleaning frame 1402 moves horizontally, and the cleaning strip 1403 cleans the surface of the conveyor belt to prevent the rubber particles from returning to the processing chamber 1; the heating member 18 is a heating table located at the bottom of the processing chamber 2; the heating table is heated after being powered on, and an inclined surface is provided on the top, and the collected rubber particles are heated, softened, and bonded, and then guided to the discharge pipe 16 at the bottom of the inclined surface to collect the residual rubber.

[0048] like Figure 7-Figure 8 As shown, the sedimentation channel 8 is hollow with two open ends, and the side walls are provided with opposite through grooves 801 for the sedimentation interception end of the sedimentation interception assembly 13 to pass through, and the internal space is divided into a plurality of sedimentation chambers.

[0049] like Fig. 9 As shown, the sedimentation interception assembly 13 includes sedimentation interception members arranged in pairs and located on both sides of the sedimentation channel 8; a sedimentation interception sheet 1301 is arranged between the paired sedimentation interception members and penetrates the sedimentation cavity through the through groove 801.

[0050] The sedimentation intercepting member comprises a mounting frame 1302 located in the sedimentation chamber 15 ; a winding shaft 1306 and two groups of cleaning rollers 1303 are arranged in a triangular position on the mounting frame 1302 ; a cleaning frame 1304 is arranged on one side of each group of cleaning rollers 1303 .

[0051] It should be further explained that the cleaning frame 1304 is an arc-shaped structure, with the concave surface facing the cleaning roller 1303 , and cleaning bristles 1305 are arranged between the cleaning roller 1303 and the corresponding cleaning frame 1304 .

[0052] like Fig.10As shown, the sediment intercepting sheet 1301 is located between the cleaning roller 1303 and the cleaning frame 1304 to form an S-shaped trend, and the end portion is wound around the winding shaft 1306 which is powered and rotated.

[0053] It should be further explained that the sediment interception plate 1301 includes a filtration area 1301a at the upper end and an interception area 1301b at the lower end; the filtration area 1301a intercepts impurities whose size is larger than the filter hole; and the interception area 1301b is used to store sediment.

[0054] like Figure 8 , Fig.11 As shown, a corresponding discharge port 802 is provided at the bottom of the sedimentation chamber, and a vent 803 is provided at the top; a collecting pipe 17 corresponding to the discharge port 802 is provided on the collection box to classify and collect the waste in different sedimentation chambers for subsequent reuse. A vent pipe 19 corresponding to the vent 803 and connected to an external air pump is also provided on the collection box to accelerate the sedimentation to the bottom by ventilating downward.

[0055] The sediment interception sheet 1301 is moved by rotating the two sets of winding shafts 1306 in a positive and negative direction. During the movement, on the one hand, the sediment interception sheet 1301 is replaced to ensure its filtering effect, and on the other hand, the sediment interception sheet 1301 moves between the cleaning roller 1303 and the cleaning frame 1304 and is acted on by the cleaning bristles 1305 to achieve the purpose of cleaning.

[0056] like Figure 9-10 As shown, it also includes a spray component 12 that acts on the sedimentation intercepting piece 1301; the spray component 12 includes a spray pipe 1201 located outside the sedimentation intercepting piece; the spray pipe 1201 sprays water toward between the winding shaft 1306 and the cleaning roller 1303, and is connected to the external water tank 4 through a pipeline.

[0057] It should be further explained that a water pipe 11 for conducting the wastewater after spraying is arranged on the collection box; the water pipe 11 is connected to the wastewater purification box 3 .

[0058] It should be further explained that the in-and-out sediment intercepting piece 1301 moves between the cleaning roller 1303 and the cleaning frame 1304 , and is acted upon by the cleaning bristles 1305 , while the spray pipe 1201 sprays water thereon, so as to further remove dirt on the sediment intercepting piece 1301 .

[0059] like Fig.12 As shown, the top of the water inlet tank 7 is connected to the treatment chamber 2 2 through a valve, one side is connected to the sedimentation channel 8, and the other side is provided with a pressurizing device 701; the sewage in the treatment chamber 2 2 first enters the water inlet tank 7 and passes through the sedimentation channel 8 under a pressurized environment.

[0060] like Fig.13As shown, one end of the water outlet box 9 is connected to the sedimentation channel 8, and the other end is connected to the sewage purification box 3 through the water outlet pipe 10, and an adsorbent 901 is arranged inside; the adsorbent 901 (such as activated carbon) can adsorb residual organic matter and colored substances in the water to further purify the water quality.

[0061] Example 2: Based on the multi-stage sedimentation device for sewage treatment in the embodiment, this embodiment proposes a sewage treatment method for a tire rubber workshop, and the steps are as follows:

[0062] S1, the wastewater from the tire rubber workshop enters the processing chamber 1 from the feed part 5, and the slag blocking rack 502 intercepts the large volume of garbage to initially filter the wastewater;

[0063] S2, the sewage falls on the conveyor belt of the conveyor belt unit 6, and the remaining rubber particles are intercepted and move along the conveyor belt into the processing chamber 2;

[0064] S3, the sewage in the treatment chamber 1 passes through the water inlet tank 7 and the pressure port into the sedimentation channel 8;

[0065] S4. According to the molecular weight of rubber whey and grease and the characteristics of other pollutants in the sewage, a suitable sedimentation interception sheet 1301 is selected, and the sedimentation interception sheets 1301 of different grades are wound on the corresponding winding shaft 1306 in descending order of molecular weight cutoff, covering the corresponding sedimentation chamber, and the sedimentation is accelerated by downward ventilation, and the flowing sewage is filtered and intercepted through the filtering area 1301a, and the impurities in the sewage of the tire rubber workshop are collected through the interception area 1301b;

[0066] S5. The sediment interception sheet 1301 is moved regularly by rotating the two sets of winding shafts 1306 one forward and one reverse. During the movement, on the one hand, the sediment interception sheet 1301 is replaced to ensure its filtering effect. On the other hand, the sediment interception sheet 1301 that enters and exits moves between the cleaning roller 1303 and the cleaning frame 1304 and is acted upon by the cleaning bristles 1305. The spray pipe 1201 sprays water on the sediment interception sheet 1301 to further remove dirt on the sediment interception sheet 1301.

[0067] S6, the remaining sewage is passed through the adsorbent 901 to absorb the residual organic matter and colored substances in the water, and then enters the sewage purification tank 3, and the remaining difficult-to-degrade organic matter is deeply treated by adding Fenton's reagent oxidation or ozone oxidation;

[0068] S7. Classify and recycle the collected precipitates.

[0069] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A multi-stage sedimentation device for sewage treatment, characterized in that: include: A collection box, which is divided into a processing chamber 1 (1) on the left side, a processing chamber 2 (2) on the upper right side, and a sedimentation chamber (15) on the lower right side; A feed member (5) is located at the top of the second processing chamber (2) and is used to intercept large-volume debris in the wastewater of the tire rubber workshop; A conveyor belt unit (6) is located below the feed member (5), and the end of the discharge end extends into the treatment chamber 1 (1) to separate and collect rubber particles remaining in the wastewater of the tire rubber workshop; The sedimentation channel (8) is located in the sedimentation chamber (15). The sedimentation channel (8) is hollow and open at both ends. One end is connected to the water inlet tank (7) for water inlet, and the other end is connected to the water outlet tank (9) for water outlet. The side wall is provided with opposite through grooves (801) for the sedimentation interception end of the sedimentation interception assembly (13) to pass through, and the internal space is divided into a plurality of sedimentation chambers. A plurality of sedimentation interception components (13) are arranged along the water flow direction of the sedimentation channel (8), and the sedimentation interception end intercepts and precipitates pollutants in the wastewater of the tire rubber workshop in a graded manner; the sedimentation interception components (13) include sedimentation interception pieces arranged in pairs and located on both sides of the sedimentation channel (8); a sedimentation interception sheet (1301) is arranged between the paired sedimentation interception pieces and passes through the sedimentation cavity through the through slot (801); and a sewage purification tank (3) which is connected to the water outlet tank (9) to collect, purify and process the remaining sewage; A cleaning element (14) for acting on the conveyor belt unit (6) is provided in the second processing chamber (2), and a heating element (18) for acting on the collected rubber particles is also provided; The sedimentation interception member comprises a mounting frame (1302) located in a sedimentation chamber (15); a winding shaft (1306) and two groups of cleaning rollers (1303) are arranged on the mounting frame (1302) in a triangular position; a cleaning frame (1304) is arranged on one side of each group of cleaning rollers (1303); the cleaning frame (1304) is an arc-shaped structure, with a concave surface facing the cleaning roller (1303), and cleaning bristles (1305) are arranged between the cleaning roller (1303) and the corresponding cleaning frame (1304); the sedimentation interception sheet (1301) is located between the cleaning roller (1303) and the cleaning frame (1304) to form an S-shaped trend, and the end portion is wound around the winding shaft (1306) that rotates when powered; The sediment interception plate (1301) comprises a filtration area (1301a) at the upper end and an interception area (1301b) at the lower end; the filtration area (1301a) intercepts impurities with a size larger than the filter holes; and the interception area (1301b) is used to store sediment.

2. The multi-stage sedimentation device for sewage treatment according to claim 1, characterized in that: The feed member (5) comprises a feed hopper (501) extending into the processing chamber (1) and located above the conveyor belt unit (6); a movable slag retaining frame (502) is provided at the feed end of the feed hopper (501); A slag blocking plate (503) with a liquid leakage hole is arranged at the bottom of the slag blocking frame (502), and a handle (504) is arranged at the side.

3. The multi-stage sedimentation device for sewage treatment according to claim 1, characterized in that: A corresponding discharge port (802) is arranged at the bottom of the sedimentation chamber, and a vent (803) is arranged at the top; a collecting pipe (17) corresponding to the discharge port (802) is arranged on the collection box, and a vent pipe (19) corresponding to the vent (803) is also arranged on the collection box.

4. The multi-stage sedimentation device for sewage treatment according to claim 1, characterized in that: It also includes a spray assembly (12) that acts on the sediment interception piece (1301); the spray assembly (12) includes a spray pipe (1201) located outside the sediment interception piece; the spray pipe (1201) sprays water toward between the winding shaft (1306) and the cleaning roller (1303), and is connected to an external water tank (4) through a pipeline.

5. The multi-stage sedimentation device for sewage treatment according to claim 1, characterized in that: The top of the water inlet box (7) is connected to the second processing chamber (2), one side is connected to the sedimentation channel (8), and the other side is provided with a pressurizing device (701).

6. The multi-stage sedimentation device for sewage treatment according to claim 1, characterized in that: One end of the water outlet box (9) is connected to the sedimentation channel (8), and the other end is connected to the sewage purification box (3) through the water outlet pipe (10), and an adsorbent (901) is arranged inside.

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