Sewage treatment device and treatment method for paper pulp papermaking

Abstract

The invention discloses a sewage treatment device for paper pulp papermaking and a treatment method, the sewage treatment device comprises a pretreatment pool, a first conveyor belt is arranged in the pretreatment pool, and the first conveyor belt is of a triangular structure; a plurality of uniformly distributed permeation holes are formed in the first conveying belt; the pretreatment pool is provided with a compression roller corresponding to the upper part of the first conveyor belt; a second conveyor belt is arranged in the pretreatment pool corresponding to the first conveyor belt; convex blocks in one-to-one correspondence are arranged at the positions, corresponding to the permeation holes, of the second conveying belt; suspended matters in sewage are quickly fished by utilizing the first conveying belt, and then the suspended matters are uniformly smeared, extruded, dehydrated and intensively collected on the first conveying belt, so that not only is the suspended matters in the paper pulp papermaking sewage quickly fished by operators facilitated, but also the sewage in the suspended matters can be treated, manpower and material resources are saved, and the working efficiency is improved. The sewage treatment efficiency is improved, the defects in the prior art are overcome, and the fiber recycling rate is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of papermaking wastewater treatment, in particular to a paper pulp papermaking wastewater treatment device and method. BACKGROUND

[0002] Paper pulp papermaking is a process of converting wood, waste paper or other fiber raw materials into paper through a series of chemical and mechanical treatments; by soaking and crushing the raw materials, paper pulp is obtained, then the cleanliness and brightness of the paper pulp are improved through deinking, bleaching and other processes, and then the treated paper pulp is finally made into various types of paper through forming, pressing and drying steps.

[0003] The paper pulp papermaking wastewater treatment device is a system designed to treat industrial wastewater generated during the paper pulp papermaking process; the device usually includes multiple treatment units such as primary sedimentation tanks, anaerobic reactors and aerobic reactors, etc., aiming to remove organic matter, suspended solids and chemical pollutants in wastewater; through the combination of physical, chemical and biological treatment, the wastewater is effectively purified and finally meets the environmental emission standards.

[0004] Patent CN112174391A discloses a paper pulp papermaking wastewater treatment device, which includes a filter box and a treatment tank, a sieve plate is arranged at the upper part of the filter box, a primary filter screen is arranged at the bottom of the sieve plate, a secondary filter screen is arranged below the primary filter screen, a soft brush is used to remove impurities on the surface of the primary and secondary filter screens, a pressure pump is arranged to deliver wastewater treatment chemicals in a chemical tank to the treatment tank through a pipeline, harmful substances in the wastewater are removed, the treatment effect is improved, and the normal operation of the equipment is effectively avoided.

[0005] However, during the paper pulp wastewater treatment process, there are some suspended solids in the water body, which are mostly composed of fibers and fiber fines and can be recycled and reused. The wastewater treatment equipment in the above-mentioned patent technical solution cannot quickly filter out the suspended solids, and the sieve plate or filter screen structure cannot effectively treat and recycle the filtered suspended solids, which can only be removed after the filtration work is completed to ensure the subsequent filtration work, which has certain limitations. SUMMARY

[0006] The present application relates to the technical field of papermaking wastewater treatment, in particular to a paper pulp papermaking wastewater treatment device and method.

[0007] The technical problems of the present application can be solved by the following technical solutions: The utility model provides a paper pulp papermaking sewage treatment device, including the pretreatment pool, the inside of pretreatment pool is provided with first conveyer, and the first conveyer presents the triangular structure, a plurality of evenly distributed permeation holes are seted up on the first conveyer, the position corresponding to the upper portion of first conveyer of pretreatment pool is provided with the compression roller, the position corresponding to the inside of first conveyer of pretreatment pool is provided with second conveyer, and the lower surface of first conveyer upper portion is bonded with the upper surface of second conveyer, and the position corresponding to permeation hole of second conveyer is provided with the corresponding protruding block.

[0008] Preferably, when the second conveyer rotates following the first conveyer, the protruding block arranged on the second conveyer gradually fills into the corresponding permeation hole, so that the part of the first conveyer receiving the suspended matter constitutes a non-porous structure.

[0009] Preferably, the pretreatment pool is provided with a baffle corresponding to the upper portion of the first conveyer, the baffle presents a straight-angled trapezoidal structure with the tapered portion downward, and a gap exists between the lower portion of the baffle and the first conveyer.

[0010] Preferably, a connecting block is slidably arranged in the baffle along the width direction of the pretreatment pool, the connecting block is composed of a ring block and a rectangular block, a reciprocating screw rod is further rotationally connected to the position corresponding to the ring block in the baffle, the reciprocating screw rod is rotationally connected to the baffle and threadedly connected to the ring block, and a horizontally movable scraper is further arranged at the position corresponding to the upper portion of the first conveyer in the pretreatment pool.

[0011] Preferably, the gap between the compression roller and the first conveyer is smaller than the gap between the baffle and the first conveyer.

[0012] Preferably, a third conveyer is horizontally arranged at the position corresponding to the output end of the first conveyer in the pretreatment pool, and a collection pool is arranged below the output end of the third conveyer.

[0013] Preferably, hollow flow guides are connected to the positions corresponding to the two sides of the compression roller in the pretreatment pool, and the liquid generated after the suspended matter is compressed flows to the pretreatment pool through the flow guides.

[0014] Preferably, a first partition and a second partition are arranged in the pretreatment pool at positions below the liquid level line, and a gap is left between the first partition and the second partition, and a filter screen parallel to the liquid level line is arranged in the gap between the first partition and the second partition.

[0015] Preferably, a sliding groove is arranged in the first partition and the second partition at positions corresponding to the filter screen, and one end of the sliding groove penetrates the pretreatment pool, and a drainage pipe is arranged in the pretreatment pool at the position corresponding to the gap between the first partition and the second partition.

[0016] A paper pulp papermaking sewage treatment method, comprising the following processing steps: Step 1: The wastewater generated by papermaking is passed into the pretreatment tank and pumped to the side close to the collection tank; Step 2: Start the first conveyor belt. When the sewage containing suspended matter flows through the input end of the first conveyor belt, the suspended matter is intercepted by the first conveyor belt and moved to the output end of the first conveyor belt under the drive of the first conveyor belt. Step 3: Under the action of the first conveyor belt, the suspended matter is separated from the sewage and moved to the scraper by the first conveyor belt. The reciprocating screw is driven by the motor to rotate, and the connecting block drives the scraper to move back and forth along the width direction of the first conveyor belt, so that the suspended matter is evenly laid on the upper part of the first conveyor belt; Step 4: The evenly spread suspended matter is driven by the first conveyor belt and is forced to pass through the gap between the baffle and the first conveyor belt for the first extrusion and dehydration; Step 5: After the first extrusion dehydration, the suspended matter continues to move to the pressing roller under the action of the first conveyor belt, and is forced into the gap between the pressing roller and the first conveyor belt for the second extrusion dehydration; Step 6: The suspended matter after being squeezed and dehydrated is moved to the output end by the first conveyor belt, and the processed suspended matter is transported to the collection pool at the output end of the third conveyor belt by the third conveyor belt below the output end of the first conveyor belt; At the same time, the sewage after primary treatment continues to flow to the side close to the collection pool, and under the action of the first partition and the second partition, it flows concentratedly to the gap between the first partition and the second partition. Since a filter is inserted in the gap between the first partition and the second partition, the sewage after primary treatment will undergo secondary filtration treatment under the action of the filter. Then the sewage after secondary treatment flows to the drain pipe and then enters the next treatment pool for subsequent treatment.

[0017] Beneficial effects of the present invention: 1. The pulp and papermaking wastewater treatment device provided by the present invention utilizes a first conveyor belt to quickly salvage suspended matter in the wastewater, and then evenly spreads, squeezes and dehydrates the suspended matter on the first conveyor belt and centrally collects and processes the suspended matter. This not only facilitates the rapid salvage of suspended matter in pulp and papermaking wastewater by operators, but also allows the wastewater in the suspended matter to be processed, thus saving manpower and material resources, improving wastewater treatment efficiency, making up for the defects in the existing technology, and increasing the recovery rate of fibers.

[0018] 2. The first conveyor belt and the second conveyor belt in the present invention cooperate with each other. When the second conveyor belt rotates following the first conveyor belt, the protrusions provided on the second conveyor belt will gradually fill the corresponding penetration holes, so that the part of the first conveyor belt that receives the suspended matter constitutes a non-porous structure. This not only prevents the suspended matter from entering the first conveyor belt through the penetration holes when the scraper spreads the suspended matter, but also provides greater support force for the squeezed suspended matter through the first conveyor belt and the second conveyor belt.

[0019] 3. The filter screen in the present invention is inserted between the first partition plate and the second partition plate. When the filter screen is blocked or damaged, the operator can remove the filter screen by the handle to replace, clean or repair the filter screen, which is convenient and quick, and improves practicality.

[0020] 4. The present invention provides graded treatment for the pretreatment of pulp and papermaking wastewater, which facilitates the subsequent further treatment of wastewater, improves the efficiency of wastewater treatment, and further improves the pulp and papermaking wastewater treatment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a structural schematic diagram of the first conveyor belt in the present invention; Figure 3 is a schematic diagram of the connecting plate in the present invention; Figure 4 It is a cross-sectional schematic diagram of the overall structure of the present invention; Figure 5 It is a structural schematic diagram of the guide plate in the present invention; Figure 6 It is a schematic cross-sectional view of the scraper of the present invention.

[0023] In the figure: 1. Pretreatment tank; 2. First conveyor belt; 3. Infiltration hole; 4. Baffle; 5. Motor; 6. Reciprocating screw; 7. Connecting block; 8. Scraper; 9. Pressure roller; 10. Guide plate; 11. Connecting plate; 12. Third conveyor belt; 14. Second transmission shaft; 15. First transmission shaft; 16. Bump; 17. Second conveyor belt; 18. Collection tank; 19. First partition; 20. Second partition; 21. Filter; 22. Drain pipe; 23. Handle; 24. Chute. DETAILED DESCRIPTION

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 2 、 Figure 4 and Figure 6As shown, a pulp and papermaking wastewater treatment device and treatment method include a pretreatment tank 1; a first conveyor belt 2 is provided inside the pretreatment tank 1, the first conveyor belt 2 has a triangular structure, and the upper part of the first conveyor belt 2 is parallel to the liquid level line, the first conveyor belt 2 is used to separate suspended matter in the wastewater and carry the suspended matter for movement; the first conveyor belt 2 is rotatably connected to the pretreatment tank 1 via three first transmission shafts 15; a plurality of evenly distributed infiltration holes 3 are opened on the first conveyor belt 2, and the infiltration holes 3 are used to separate the wastewater from the suspended matter.

[0026] A baffle 4 is provided in the pretreatment tank 1 at a position corresponding to the upper part of the first conveyor belt 2. The baffle 4 is a right-angled trapezoidal structure with the tapered part facing downward, and the length of the baffle 4 is consistent with the width of the first conveyor belt 2; there is a gap between the lower part of the baffle 4 and the first conveyor belt 2, so that the suspended matter is spread flat on the first conveyor belt 2 with the thickness of the gap; a connecting block 7 is provided inside the baffle 4 for sliding along the width direction of the pretreatment tank 1, and the connecting block 7 is composed of a ring block and a rectangular block; a reciprocating screw 6 is also rotatably connected to the position corresponding to the ring block inside the baffle 4, and the reciprocating screw 6 is rotatably connected to the baffle 4 and threadedly connected to the ring block; a motor 5 is fixedly provided at the end of the reciprocating screw 6, and the output end of the motor 5 is fixedly connected to the end of the reciprocating screw 6; a horizontally movable scraper 8 is also provided at the position corresponding to the upper part of the first conveyor belt 2 of the pretreatment tank 1, and the scraper 8 moves horizontally along the width direction of the first conveyor belt 2 with the cooperation of the reciprocating screw 6 and the connecting block 7, so as to evenly spread the suspended matter on the first conveyor belt 2, thereby facilitating the subsequent dehydration of the suspended matter.

[0027] A pressure roller 9 is also provided in the pretreatment tank 1 at a position corresponding to the upper part of the first conveyor belt 2. The pressure roller 9 is located next to the baffle 4 and has the same length as the baffle 4. It is used to cooperate with the first conveyor belt 2 and the second conveyor belt 17 to fully squeeze out the moisture of the suspended matter; there is a certain gap between the pressure roller 9 and the first conveyor belt 2, and the gap between the pressure roller 9 and the first conveyor belt 2 is smaller than the gap between the baffle 4 and the first conveyor belt 2, which facilitates further squeezing and dehydration of the suspended matter.

[0028] A second conveyor belt 17 is provided at a position inside the pretreatment tank 1 corresponding to the first conveyor belt 2, and the lower surface of the upper part of the first conveyor belt 2 is in contact with the upper surface of the upper part of the second conveyor belt 17; the second conveyor belt 17 is connected to the pretreatment tank 1 via two second transmission shafts 14; corresponding protrusions 16 are provided on the second conveyor belt 17 at positions corresponding to the penetration holes 3; the penetration holes 3 on the upper part of the first conveyor belt 2 and the protrusions 16 on the upper part of the second conveyor belt 17 cooperate with each other to form a planar structure without penetration holes 3.

[0029] A horizontally arranged third conveyor belt 12 is provided at the position of the pretreatment tank 1 corresponding to the output end of the first conveyor belt 2. The third conveyor belt 12 is connected to the pretreatment tank 1 via third transmission shafts at both ends; the third transmission shaft at one end is connected to the pretreatment tank 1 via connecting plates 11 at both ends; a collection tank 18 is provided below the output end of the third conveyor belt 12, and the collection tank 18 is used to collect dehydrated suspended matter, so as to facilitate the operators to uniformly recycle and utilize the treated suspended matter.

[0030] A first baffle 19 and a second baffle 20 are provided in the pretreatment tank 1 at a position corresponding to the position below the liquid level line, and a gap is left between the first baffle 19 and the second baffle 20; the first baffle 19 is a right-angled trapezoidal structure, guiding the sewage to flow into the gap between the first baffle 19 and the second baffle 20; a filter screen 21 parallel to the liquid level line is provided in the gap between the first baffle 19 and the second baffle 20, and the length of the filter screen 21 is consistent with the width of the pretreatment tank 1, and the filter screen 21 is used for secondary coarse filtration of the sewage.

[0031] The first partition 19 and the second partition 20 are respectively provided with a chute 24 at the position corresponding to the filter 21, and one end of the chute 24 passes through the pretreatment tank 1; when the filter 21 is inserted into the chute 24, the end of the filter 21 seals the chute 24; the end of the filter 21 is fixedly connected to a handle 23, which is used to facilitate the operator to disassemble and repair the filter 21.

[0032] A connecting drain pipe 22 is provided in the gap between the first partition 19 and the second partition 20 of the pretreatment tank 1. The drain pipe 22 is used to introduce the sewage after preliminary treatment into the treatment tank for the next step of sewage treatment, so as to facilitate further treatment and purification of the sewage.

[0033] See also Figure 3 and Figure 5 As shown, the pretreatment tank 1 is connected to the positions on both sides of the pressure roller 9 with hollow guide plates 10. The liquid produced after the suspended matter is squeezed flows into the pretreatment tank 1 through the guide plates 10 and undergoes secondary treatment together with the sewage in the tank after the suspended matter is removed.

[0034] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation mode of the present invention in actual process is described in detail below: Step 1: The wastewater generated by papermaking is passed into the pretreatment tank 1, and the wastewater is pumped to flow to the side close to the collection tank 18.

[0035] Step 2: Start the first conveyor belt 2. When the sewage containing suspended matter flows through the input end of the first conveyor belt 2, the suspended matter is intercepted by the first conveyor belt 2 and moves to the output end of the first conveyor belt 2 under the drive of the first conveyor belt 2.

[0036] Step 3: Under the action of the first conveyor belt 2, the suspended matter is separated from the sewage, and the first conveyor belt 2 is used to move the suspended matter to the scraper 8. The reciprocating screw 6 is driven by the motor 5 to rotate, and the connecting block 7 drives the scraper 8 to reciprocate along the width direction of the first conveyor belt 2, so that the suspended matter is evenly laid on the upper part of the first conveyor belt 2; Among them, since the lower surface of the upper part of the first conveyor belt 2 is in contact with the upper surface of the upper part of the second conveyor belt 17, when the second conveyor belt 17 rotates following the first conveyor belt 2, the protrusions 16 provided on the second conveyor belt 17 will gradually fill the corresponding penetration holes 3, so that the part of the first conveyor belt 2 that receives the suspended matter constitutes a non-porous structure, thereby preventing the suspended matter from entering the interior of the first conveyor belt 2 through the penetration holes 3 when the scraper 8 spreads the suspended matter.

[0037] Step 4: The evenly spread suspended matter is driven by the first conveyor belt 2 and forced to pass through the gap between the baffle 4 and the first conveyor belt 2 for the first extrusion and dehydration.

[0038] Step 5: After the first extrusion dehydration, the suspended matter continues to move to the pressing roller 9 under the action of the first conveyor belt 2, and is forced into the gap between the pressing roller 9 and the first conveyor belt 2 for the second extrusion dehydration; Since the two sides of the pretreatment tank 1 are provided with communicating hollow guide plates 10 corresponding to the suspended matter extrusion and dehydration areas, the sewage squeezed out by the suspended matter will flow back into the pretreatment tank 1 again through the guide plates 10 .

[0039] Step 6: The suspended matter after squeezing and dehydration is moved to the output end by the first conveyor belt 2, and the third conveyor belt 12 below the output end of the first conveyor belt 2 is used to transport the processed suspended matter to the collection tank 18 at the output end of the third conveyor belt 12; At the same time, the sewage after the primary treatment continues to flow to the side close to the collection tank 18, and under the action of the first partition 19 and the second partition 20, it flows concentratedly to the gap between the first partition 19 and the second partition 20. Since a filter screen 21 is inserted in the gap between the first partition 19 and the second partition 20, the sewage after the primary treatment will undergo a secondary filtration treatment under the action of the filter screen 21, and then the sewage after the secondary treatment flows to the drain pipe 22, and then enters the next treatment tank for subsequent treatment.

[0040] The pulp and papermaking wastewater treatment device provided by the present invention utilizes the first conveyor belt 2 to quickly salvage suspended matter in the wastewater, and then evenly spreads, squeezes and dehydrates the suspended matter and centrally collects and processes the suspended matter on the first conveyor belt 2. This not only facilitates the rapid salvage of suspended matter in pulp and papermaking wastewater by operators, but also can process the wastewater in the suspended matter, saving manpower and material resources, improving the wastewater treatment efficiency, making up for the defects in the existing technology, and increasing the recovery rate of fibers.

[0041] Among them, the first conveyor belt 2 and the second conveyor belt 17 cooperate with each other. When the second conveyor belt 17 rotates following the first conveyor belt 2, the protrusions 16 set on the second conveyor belt 17 will gradually fill the corresponding penetration holes 3, so that the part of the first conveyor belt 2 that receives the suspended matter constitutes a non-porous structure, which not only prevents the suspended matter from entering the first conveyor belt 2 from the penetration holes 3 when the scraper 8 spreads the suspended matter, but also provides greater support force for the squeezed suspended matter through the first conveyor belt 2 and the second conveyor belt 17.

[0042] Furthermore, the filter 21 in the present invention is inserted between the first partition 19 and the second partition 20. When the filter 21 is blocked or damaged, the operator can remove the filter 21 through the handle 23 to replace, clean or repair the filter 21, which is convenient and quick, and improves practicality.

[0043] Furthermore, the present invention provides a graded treatment for the pretreatment of pulp and papermaking wastewater, which facilitates the subsequent further treatment of the wastewater, improves the efficiency of wastewater treatment, and further improves the pulp and papermaking wastewater treatment system.

[0044] It should be noted that, in this document, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0045] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A wastewater treatment device for pulp and paper making, comprising a pretreatment tank (1), characterized in that: A first conveyor belt (2) is provided inside the pretreatment tank (1), and the first conveyor belt (2) is in a triangular structure; a plurality of evenly distributed permeation holes (3) are provided on the first conveyor belt (2); A pressure roller (9) is provided at a position of the pretreatment tank (1) corresponding to the upper portion of the first conveyor belt (2); a second conveyor belt (17) is provided at a position of the pretreatment tank (1) corresponding to the interior of the first conveyor belt (2), and the lower surface of the upper portion of the first conveyor belt (2) is in contact with the upper surface of the second conveyor belt (17); and corresponding protrusions (16) are provided at positions of the second conveyor belt (17) corresponding to the penetration holes (3).

2. A pulp and papermaking wastewater treatment device according to claim 1, characterized in that: When the second conveyor belt (17) rotates following the first conveyor belt (2), the protrusions (16) provided on the second conveyor belt (17) will gradually fill in the corresponding penetration holes (3), so that the part of the first conveyor belt (2) that receives the suspended matter forms a non-porous structure.

3. The pulp and papermaking wastewater treatment device according to claim 1, characterized in that: The pretreatment tank (1) is provided with a baffle (4) at a position corresponding to the upper portion of the first conveyor belt (2). The baffle (4) is in a right-angled trapezoidal structure with a tapered portion facing downwards. A gap exists between the lower portion of the baffle (4) and the first conveyor belt (2).

4. A pulp and papermaking wastewater treatment device according to claim 3, characterized in that: A connecting block (7) is provided in the baffle (4) so ​​as to slide along the width direction of the pretreatment tank (1), and the connecting block (7) is composed of a ring block and a rectangular block; a reciprocating screw rod (6) is also rotatably connected to the position of the baffle (4) corresponding to the ring block, and the reciprocating screw rod (6) is rotatably connected to the baffle (4) and is threadedly connected to the ring block; a horizontally movable scraper (8) is also provided in the pretreatment tank (1) at a position corresponding to the upper part of the first conveyor belt (2).

5. The pulp and papermaking wastewater treatment device according to claim 3, characterized in that: The gap between the pressure roller (9) and the first conveyor belt (2) is smaller than the gap between the baffle (4) and the first conveyor belt (2).

6. The pulp and papermaking wastewater treatment device according to claim 1, characterized in that: The pretreatment tank (1) is provided with a horizontally arranged third conveyor belt (12) at a position corresponding to the output end of the first conveyor belt (2); and a collection tank (18) is provided below the output end of the third conveyor belt (12).

7. The pulp and papermaking wastewater treatment device according to claim 6, characterized in that: The pretreatment tank (1) is connected to hollow guide plates (10) at positions corresponding to both sides of the pressing roller (9), and liquid generated after the suspended matter is squeezed flows into the pretreatment tank (1) through the guide plates (10).

8. The pulp and papermaking wastewater treatment device according to claim 1, characterized in that: A first baffle (19) and a second baffle (20) are provided at positions corresponding to below a liquid level line in the pretreatment tank (1), with a gap left between the first baffle (19) and the second baffle (20); and a filter screen (21) parallel to the liquid level line is provided in the gap between the first baffle (19) and the second baffle (20).

9. The pulp and papermaking wastewater treatment device according to claim 8, characterized in that: The first partition (19) and the second partition (20) are respectively provided with a chute (24) at a position corresponding to the filter screen (21), and one end of the chute (24) passes through the pretreatment tank (1); a connected drain pipe (22) is provided at the gap between the first partition (19) and the second partition (20) in the pretreatment tank (1).

10. A method for treating wastewater used in pulp and papermaking, applicable to a wastewater treatment device used in pulp and papermaking according to any one of claims 1 to 9, characterized in that: The following processing steps are included: Step 1: The wastewater generated by papermaking is passed into the pretreatment tank (1), and the wastewater is pumped to flow toward the side close to the collection tank (18); Step 2: starting the first conveyor belt (2); when the sewage containing suspended matter flows through the input end of the first conveyor belt (2), the suspended matter is intercepted by the first conveyor belt (2) and moves to the output end of the first conveyor belt (2) under the drive of the first conveyor belt (2); Step 3: Under the action of the first conveyor belt (2), the suspended matter is separated from the sewage, and the first conveyor belt (2) is used to move the suspended matter to the scraper (8), and the reciprocating screw (6) is driven to rotate by the motor (5), and the scraper (8) is driven to move back and forth along the width direction of the first conveyor belt (2) in conjunction with the connecting block (7), so that the suspended matter is evenly laid on the upper part of the first conveyor belt (2); Step 4: The evenly spread suspended matter is forced to pass through the gap between the baffle (4) and the first conveyor belt (2) under the drive of the first conveyor belt (2) to undergo the first extrusion and dehydration; Step 5: After the first extrusion dehydration, the suspended matter continues to move to the pressing roller (9) under the action of the first conveyor belt (2), and is forced into the gap between the pressing roller (9) and the first conveyor belt (2) for the second extrusion dehydration; Step 6: The suspended matter after being squeezed and dehydrated is moved to the output end by the first conveyor belt (2), and the treated suspended matter is transported to the collection pool (18) at the output end of the third conveyor belt (12) by the third conveyor belt (12) below the output end of the first conveyor belt (2); At the same time, the sewage after primary treatment continues to flow toward the side close to the collection tank (18), and under the action of the first partition (19) and the second partition (20), it flows to the gap between the first partition (19) and the second partition (20). Since a filter (21) is inserted in the gap between the first partition (19) and the second partition (20), the sewage after primary treatment will be subjected to secondary filtration treatment under the action of the filter (21), and then the sewage after secondary treatment will flow to the drain pipe (22) and then enter the next treatment tank for subsequent treatment.

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