A multi-stage AO treatment device and phosphorus removal method for domestic sewage

Abstract

This application relates to the field of wastewater treatment technology, and in particular to a multi-stage AO treatment device and phosphorus removal method for domestic wastewater. It includes an outer shell for overall protection, a sedimentation device for sludge settling, and a sludge conveying device. Vertically placed partitions are fixedly connected to both sides of the inner shell for separation. Two partitions are installed on each side of the sedimentation device. The front partition and the rear partition are respectively installed at the front and rear ends of the conveying device. In this application, through the outer shell, anaerobic tank, aerobic tank, sedimentation device, conveying device, liquid delivery pipe, first extraction pipe, extraction circulation pump, first feeding pipe, sludge extraction pipe, sludge pump, sludge conveying pipe, second extraction pipe, feeding circulation pump, second feeding pipe, and drain valve, phosphorus and nitrogen can be directly removed through the anaerobic tank, the reaction continues in the aerobic tank, and the sludge is settled through the sedimentation device, achieving multi-stage treatment.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, specifically to a multi-stage AO treatment device and phosphorus removal method for domestic wastewater. Background Technology

[0002] Domestic sewage is wastewater discharged from residents' daily lives, mainly originating from residential and public buildings, such as residences, government offices, schools, hospitals, shops, public places, and industrial enterprise toilets. In order to allow domestic sewage to be discharged quickly, it is usually treated directly through the AO water treatment process. The AO water treatment process is also called the anaerobic-aerobic water treatment process. A is the anaerobic stage, which is used for nitrogen and phosphorus removal; O is the aerobic stage, which is used for removing organic matter from the water.

[0003] Traditional AO (anaerobic-aerobic) wastewater treatment equipment typically sends wastewater directly into an anaerobic tank for phosphorus and nitrogen removal, followed by an aerobic tank for further purification of organic matter. After sludge sedimentation, the wastewater is returned to the anaerobic tank for continued purification, and this cycle repeats. However, the sludge is directly collected and settled in the aerobic tank, which means that when wastewater is returned from the aerobic tank, the sludge easily flows back into the anaerobic tank. Furthermore, collecting the treated sludge is inconvenient. Therefore, to address these issues, a multi-stage AO treatment device and phosphorus removal method for domestic wastewater are proposed. Summary of the Invention

[0004] The purpose of this application is to provide a multi-stage AO treatment device and phosphorus removal method for domestic sewage, so as to solve the problem that some of the sludge in the aerobic tank will return to the anaerobic tank, while the sludge remaining in the aerobic tank is difficult to treat.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A multi-stage AO treatment device and phosphorus removal method for domestic sewage includes an integrated protective shell, a sedimentation device for sludge settling, and a sludge conveying device. Vertically placed partitions are fixedly connected to both sides of the inner shell for separation. Two partitions are installed on each side of the sedimentation device. The front partition and the rear partition are respectively installed at the front and rear ends of the conveying device. An anaerobic tank is fixedly connected to the rear of the inner shell, and an aerobic tank is fixedly connected to the front of the inner shell. A delivery pipe is fixedly connected to the rear top of the inner shell, with its front end positioned at the top of the anaerobic tank. A first extraction pipe is fixedly connected to the left side of the bottom of the anaerobic tank, and a extraction circulation pump is fixedly connected to the other end of the first extraction pipe. The bottom of the extraction circulation pump is fixedly connected to the outer shell, and its front end is fixedly connected to... A first feeding pipe is fixedly connected at one end to the left side of the bottom of the aerobic tank. A sludge suction pipe is fixedly connected at the right side of the bottom of the aerobic tank. A sludge pump is fixedly connected at the other end of the sludge suction pipe. The sludge pump is fixedly connected to a baffle plate at the rear. A sludge conveying pipe is fixedly connected at the top of the sludge pump. The other end of the sludge conveying pipe is installed at the bottom of a flow guiding device. The flow guiding device is located above the right side of the sedimentation device. A second feeding pipe is fixedly connected at the bottom of the sedimentation device. A feeding circulation pump is fixedly connected at the other end of the second feeding pipe. A second feeding pipe is fixedly connected at the other end of the feeding circulation pump. The other end of the second feeding pipe is fixedly connected at the top front end of the anaerobic tank. A drain valve is fixedly connected at the left side of the front front end of the aerobic tank. The outside of the drain valve is fixedly connected to the outer shell. A top cover is installed on the top of the outer shell. Evenly distributed inspection doors are installed at the front of the outer shell.

[0007] Preferably, the sedimentation device includes a fixed box, an installation body for limiting the installation of the filter body, a clamping plate, a rubber block, a filter body for filtering sludge, and a handle for installing and disassembling the filter body. Partitions are fixedly connected to both sides of the fixed box, a second extraction pipe is fixedly connected to the bottom of the fixed box, and a horizontally arranged installation body is fixedly connected to the top of the fixed box. A clamping plate is fixedly connected to the top right side of the installation body, and the clamping plate has evenly distributed slots at its bottom. The top right side of the filter body is positioned within the slots on the clamping plate, and the top left side of the filter body is positioned within the installation body. Several filter bodies penetrate the installation body. The handle is installed on the front and rear sides of the top of the filter body.

[0008] Preferably, the mounting body includes a support frame, a locking block, a insert plate, a sliding plate limiting plate, a sliding rod, and a first spring. The outer side of the support frame is fixedly connected to the fixed box, and the top right side of the support frame is fixedly connected to the locking plate. The top left side of the support frame has an installation groove that corresponds one-to-one with the locking groove on the locking plate. The support frame is fixedly connected to two horizontally arranged sliding rods arranged front-to-back through the inner wall of the installation groove. The support frame is fixedly connected to two horizontally arranged limiting plates arranged front-to-back through the inner wall of the installation groove. The two sliding rods are respectively arranged on the front and back sides of the two limiting plates. The top of the support frame has a locking block that corresponds one-to-one with the installation groove. The locking block has a limiting groove. The bottom of the locking block is fixedly connected to a sliding plate. The sliding plate is arranged in the installation groove of the support frame, and the limiting plate and the sliding rod are arranged through the sliding plate. The sliding rod has a first spring on its outer side. The filter body is evenly arranged in the support frame.

[0009] Preferably, the filter body includes an installation frame, a limiting frame, a filter screen sleeve disposed below the flow guiding device, a support frame, a rubber frame for limiting the filter screen sleeve, an insert rod, and an insert block for positioning the insert rod. The limiting frame is fixedly connected to the bottom of the installation frame, and the support frame is fixedly connected to the bottom of the limiting frame. The filter screen sleeve is disposed through the installation frame and the limiting frame. The top outer side of the filter screen sleeve is disposed through evenly distributed insert rods. One end of the insert rod is fixedly connected to the installation frame, and the other end of the insert rod is hemispherical. An arc groove is opened on the outer side of the hemispherical end of the insert rod. Insert blocks are provided on both sides of the arc groove of the insert rod. The rubber frame has evenly distributed insertion holes. The insert rod is disposed in the insertion holes. Two insert blocks are fixedly connected to the insertion holes of the rubber frame. The rubber frame is disposed in the installation frame, and the insert rod is disposed in the rubber frame. The outer side of the rubber frame is tightly fitted with the filter screen sleeve.

[0010] Preferably, the mounting frame is positioned above the support frame, with its bottom fitting snugly against the support frame. The right side of the mounting frame is positioned within a slot in the card plate, and a rubber block is provided within the slot. The mounting frame and the rubber block fit snugly against each other. The left side of the mounting frame is positioned within a limiting groove in the card block, and two horizontally arranged insert plates are fixedly connected within the limiting groove in the card block. The mounting frame has two horizontally arranged slots on one side within the card block, and the insert plates are positioned within the slots in the mounting frame. The limiting frame is positioned within the support frame, and the support frame fits snugly against the filter screen sleeve. Handles are fixedly connected to both the front and rear sides of the top of the mounting frame.

[0011] Preferably, the flow guiding device includes a connecting box, a connecting pipe, a connecting body, a flow guiding pipe, a sealing body, and a limiting body. A partition is fixedly connected to both the front and rear ends of the connecting box. A mud conveying pipe is fixedly connected to the bottom of the connecting box at one end of the partition. A uniformly distributed connecting pipe is fixedly connected to the upper inner part of the connecting box at the end furthest from the mud conveying pipe. The other end of the connecting pipe is connected to the main body. A flow guiding pipe is fixedly connected to the end of the connecting body furthest from the connecting pipe. A limiting body is installed on the outer side of the end of the flow guiding pipe inside the connecting body. A sealing body is provided on the outer side of the limiting body. The sealing body is located on the outer side of the flow guiding pipe and is installed on one side of the connecting body.

[0012] Preferably, the connecting body includes a connecting shell, an arc-shaped plate, screws, a sliding shell, a rubber pad, a positioning block, an anti-detachment plate, a guide rod, and a second spring. Arc-shaped plates are provided on both the upper and lower sides of the connecting shell. A sliding shell is fixedly connected to the side of the arc-shaped plate closest to the connecting shell. Two sliding shells are arranged in a group on the upper and lower sides inside the connecting shell. A rubber pad is fixedly connected to the side of the sliding shell away from the arc-shaped plate. Screws are provided on both the front and rear sides of the arc-shaped plate, and the screws are threadedly connected to the connecting shell. An anti-detachment plate is provided on the side of the sliding shell away from the arc-shaped plate. A positioning block is fixedly connected to the anti-detachment plate away from the arc-shaped plate. A guide rod is slidably arranged inside the positioning block, and the guide rod passes through the anti-detachment plate. A uniformly distributed placement groove is opened on the side of the sliding shell away from the anti-detachment plate. The end of the guide rod away from the positioning block is fixedly connected to the placement groove opened in the sliding shell. The second spring is located outside the guide rod. The positioning block passes through the rubber pad, and the bottom of the rubber pad is tightly fitted to the connecting shell. The limiting body is located inside the connecting shell, and the sealing body is located behind the limiting body.

[0013] Preferably, the sealing body includes a fixing plate, a rubber disc, a bolt, a rubber ring, and a limiting ring. The rubber disc is fixedly connected to the side of the fixing plate near the connecting shell, and the rubber disc is tightly fitted to the connecting shell. A bolt penetrating the rubber disc is provided inside the fixing plate, and the end of the bolt away from the fixing plate is threadedly connected to the connecting shell. A rubber ring is fixedly connected to the side of the rubber disc near the connecting shell, and a limiting ring is provided inside the rubber ring. The limiting body includes a fixing ring, a insert ring, a tensioning ring, and a sealing ring. The inner side of the fixing ring is fixedly connected to the guide pipe, and the side of the fixing ring away from the connecting pipe is fixedly connected to the insert ring. A tensioning ring is fixedly connected to the outer side of the insert ring. Both the insert ring and the tensioning ring are disposed inside the rubber ring, and the side of the fixing ring away from the connecting pipe is tightly fitted to the rubber ring.

[0014] Preferably, the fixing ring has positioning grooves on both the upper and lower sides, and positioning blocks are provided in the positioning grooves of the fixing ring. The outer ring of the fixing ring near the rubber ring is arc-shaped. The limiting ring is located on the outside of the guide tube. Two limiting rings are set in a group on the inside of the insertion ring. The outer side of the rubber ring is tightly fitted with the connecting shell. The guide tube is located above the filter screen sleeve.

[0015] Preferably, it includes the following steps:

[0016] Step 1: First, connect the power supply and send the domestic sewage filtered by the screen into the anaerobic tank through the infusion tube. At this time, start the multi-stage AO treatment equipment through the controller. Add the chemical solution into the anaerobic tank and start the stirring device in the anaerobic tank. The stirring device drives the domestic sewage and microorganisms to mix thoroughly. The domestic sewage undergoes phosphorus and nitrogen removal in the anaerobic tank through microorganisms.

[0017] Step 2: After phosphorus and nitrogen removal, the domestic sewage is fed into the aerobic tank through the first pumping pipe and the first feeding pipe by the pumping circulation pump. Then, chemical solution is added to the aerobic tank, and the domestic sewage and chemical solution are fully mixed and reacted by the stirring device. The organic matter in the sewage is further removed through the aerobic tank.

[0018] Step 3: After the reaction is completed in the aerobic tank, the sludge pump controlled by the controller sends the sludge into the connecting box through the sludge suction pipe and the sludge conveying pipe. As the amount of sludge in the connecting box gradually increases, the sludge gradually enters the connecting pipe. As the sludge enters the connecting box, it gradually enters the connecting shell under the action of water pressure. The sludge enters the guide pipe through the connecting shell, and the guide pipe sends the sludge into the filter screen below. The filter screen filters the solid sediment in the sludge, and then the wastewater enters the fixed box.

[0019] Step 4: After the wastewater in the aerobic tank is transferred, the wastewater reacted in the anaerobic tank is sent into the aerobic tank through the first extraction pipe and the first feeding pipe by the pumping circulation pump for further treatment. At this time, the wastewater filtered in the fixed tank is sent into the anaerobic tank through the second extraction pipe and the second feeding pipe by the feeding circulation pump. The wastewater is further reacted by adding chemical solution to the anaerobic tank, realizing multi-stage treatment of wastewater circulation. After the wastewater treatment is completed, the drain valve is opened to discharge the treated wastewater.

[0020] Compared with the prior art, the beneficial effects of this application are:

[0021] 1. In this application, phosphorus and nitrogen can be directly removed through the anaerobic tank by means of the shell, anaerobic tank, aerobic tank, sedimentation device, diversion device, liquid conveying pipe, first pumping pipe, pumping circulation pump, first feeding pipe, sludge pump, sludge conveying pipe, second pumping pipe, feeding circulation pump, second feeding pipe and drain valve. Then, under the action of the pumping circulation pump, the first pumping pipe and the first feeding pipe, the sewage in the anaerobic tank enters the aerobic tank to continue the reaction. After the reaction is completed, under the action of the sludge pump, the sludge pump and the sludge conveying pipe, it is sent to the sedimentation device to settle the sludge. Then, under the action of the feeding circulation pump, the second pumping pipe and the second feeding pipe, the filtered sewage is sent back to the anaerobic tank for further treatment, realizing multi-stage treatment. Finally, the treated sewage is discharged through the drain valve.

[0022] 2. In this application, by setting an installation frame, a limiting frame, a filter screen sleeve, a support frame, a rubber frame, an insert rod, an insert block, and an insertion hole, the filter screen sleeve can filter sludge after sewage enters it, achieving rapid separation of sludge and sewage. While the filter screen sleeve is filtering sludge, the limiting frame and the support frame can limit and lift the filter screen sleeve to prevent excessive sludge accumulation inside the filter screen sleeve, which could lead to damage. At the same time, after the rubber frame is installed on the installation frame, the insert rod directly penetrates the filter screen sleeve and is inserted into the rubber frame. At this time, the insert block clamps the insert rod under the elasticity of the rubber frame itself, preventing the rubber frame from falling off the insert rod, thereby fixing the top of the filter screen sleeve.

[0023] 3. In this application, the supporting frame, mounting groove, locking block, insert plate, sliding plate, limiting plate, sliding rod, first spring, limiting groove, locking plate, locking slot, rubber block and handle are provided. The supporting frame can support the mounting frame. Then, after one side of the mounting frame is inserted into the locking slot of the locking plate, the sliding plate is pushed by the first spring to move. The sliding plate drives the locking block to move until the locking block is installed on the outside of the mounting frame under the action of the limiting groove. At the same time, under the action of the first spring, the mounting frame and the rubber block are tightly fitted together to achieve the positioning of the mounting frame. Meanwhile, the insert plate of the locking block is inserted into the slot of the mounting frame to further limit the mounting frame and make the mounting frame installation more stable. At the same time, when the sliding plate moves, the limiting plate can make the sliding plate move more stably.

[0024] 4. In this application, by setting up a connection box, a connection pipe, a connection body, a guide pipe, and a sealing body, the connection box can be gradually filled after sewage enters it. As sewage continues to enter the connection box, the water pressure inside the connection box increases. At this time, the sewage enters the connection pipe under the action of water pressure. Then, the sewage enters the guide pipe through the connection body. At the same time, the connection body is sealed by the sealing body. Then, the sewage in the guide pipe flows downward into the filter screen sleeve and is filtered through the filter screen sleeve.

[0025] 5. In this application, by using a connecting shell, arc plate, screws, sliding shell, rubber pad, positioning block, anti-detachment plate, guide rod, second spring, fixing plate, and bolts, one end of the guide pipe with the fixing ring can be directly placed inside the connecting shell. Then, the fixing plate is installed on one side of the connecting shell with bolts to realize the installation of the guide pipe. At this time, sewage can enter the filter screen sleeve for filtration through the connecting pipe, connecting shell, and guide pipe. At this time, the end of the guide pipe with the fixing ring can move inside the connecting shell, so that the guide pipe can be moved away from the top of the mounting frame. This allows the installation and removal of the filter screen sleeve to be unaffected by the guide pipe. At the same time, when the guide pipe moves, the second spring pushes the positioning block into the positioning groove opened in the fixing ring, thereby positioning the fixing ring and preventing the guide pipe from rotating. This ensures that the outlet of the guide pipe is always positioned above the filter screen sleeve, preventing sewage from entering the fixed box directly without passing through the filter screen sleeve, thus improving the filtration effect.

[0026] 6. In this application, by setting a fixed plate, rubber disc, bolts, rubber ring, limiting ring, fixing ring, insert ring, tensioning ring, sealing ring, and positioning groove, when the fixed plate is installed on one side of the connecting shell by bolts, the rubber disc seals between the fixed plate and the connecting shell. Then, when the fixing ring moves, the fixing ring drives the tensioning ring into the rubber ring through the insert ring, so that the outer side of the rubber ring is tightly fitted with the connecting shell, achieving a seal. At the same time, under the action of the second spring and the positioning block, one side of the fixing ring can always be in contact with the rubber ring, achieving a further seal. At this time, under the action of the limiting ring, the inner ring of the rubber ring can be supported, reducing the deformation of the inner ring of the rubber ring, so that the inner ring of the rubber ring is not tightly fitted with the guide pipe, thereby making the movement of the guide pipe more convenient. At the same time, the outer side of the sealing ring is in contact with the connecting shell, which can prevent sewage from contacting the positioning block, preventing sewage leakage, and preventing sewage from entering between the positioning block and the sliding shell, preventing blockage between the positioning block and the sliding shell, and making the movement of the positioning block within the sliding shell smoother. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this application;

[0028] Figure 2 This is a schematic diagram of the installation structure of the partition in this application;

[0029] Figure 3 This is a schematic diagram of the installation structure of the sedimentation device in this application;

[0030] Figure 4 This is a schematic diagram of the overall side sectional structure of this application;

[0031] Figure 5 This is a schematic diagram of the precipitation device structure of this application;

[0032] Figure 6This is a schematic diagram of the installation structure of the filter body in this application;

[0033] Figure 7 This is a schematic diagram of the main installation structure for this application;

[0034] Figure 8 This is a schematic diagram of the assembly structure of the filter body in this application;

[0035] Figure 9 This is a schematic diagram of the installation structure of the rubber frame in this application;

[0036] Figure 10 This is a schematic diagram of the installation structure of the insertion rod in this application;

[0037] Figure 11 For this application Figure 10 A schematic diagram of the structure at point A;

[0038] Figure 12 This is a schematic diagram of the installation structure of the mounting frame in this application;

[0039] Figure 13 For this application Figure 12 A schematic diagram of the structure at point B;

[0040] Figure 14 This is a schematic diagram of the flow guiding device of this application;

[0041] Figure 15 This is a schematic diagram of the installation structure of the connecting pipe in this application;

[0042] Figure 16 This is a schematic diagram of the installation structure of the limiting body in this application;

[0043] Figure 17 This is a schematic diagram of the mounting structure of the sliding shell in this application;

[0044] Figure 18 This is a schematic diagram of the installation structure of the tensioning ring in this application;

[0045] Figure 19 This is a schematic diagram of the installation structure of the anti-detachment plate in this application;

[0046] Figure 20 This is a schematic diagram of the assembly structure of the fixing ring in this application.

[0047] In the diagram: 1. Outer shell; 2. Top cover; 3. Inspection door; 4. Anaerobic tank; 5. Aerobic tank; 6. Sedimentation device; 61. Fixing box; 62. Mounting body; 621. Support frame; 622. Mounting groove; 623. Locking block; 624. Insert plate; 625. Slide plate; 626. Limiting plate; 627. Slide rod; 628. First spring; 629. Limiting groove; 63. Locking plate; 64. Locking groove; 65. Rubber block; 66. Filter body; 661. Mounting frame; 662. Limiting frame; 663. Filter screen sleeve; 664. Support frame; 665. Rubber frame; 666. Inserting rod; 667. Inserting block; 668. Insertion hole; 669. Slot; 67. Handle; 7. Partition plate; 8. Flow guiding device; 81. Connecting box; 82. Connecting pipe; 83. Connecting body; 8 31. Connecting shell; 832. Arc plate; 833. Screw; 834. Sliding shell; 835. Rubber pad; 836. Positioning block; 837. Anti-detachment plate; 838. Guide rod; 839. Second spring; 84. Guide pipe; 85. Sealing body; 851. Fixing plate; 852. Rubber disc; 853. Bolt; 854. Rubber ring; 855. Limiting ring; 86. Limiting body; 861. Fixing ring; 862. Insert ring; 863. Tensioning ring; 864. Sealing ring; 865. Positioning groove; 9. Infusion pipe; 10. First extraction pipe; 11. Extraction circulation pump; 12. First feeding pipe; 13. Sludge extraction pipe; 14. Sludge pump; 15. Sludge conveying pipe; 16. Second extraction pipe; 17. Feeding circulation pump; 18. Second feeding pipe; 19. Drain valve. Detailed Implementation

[0048] Please see Figure 1-20 This application provides a technical solution:

[0049] An anaerobic tank 1 for domestic sewage treatment and phosphorus removal method is disclosed. The tank includes an outer shell 1 for overall protection, a sedimentation device 6 for sludge settling, and a sludge conveying device 8. Vertically placed partitions 7 are fixedly connected to both sides of the inner shell 1, with two partitions 7 installed on each side of the sedimentation device 6. The front and rear partitions 7 are respectively installed at the front and rear ends of the conveying device 8. An anaerobic tank 4 is fixedly connected to the rear of the inner shell 1, and an aerobic tank 5 is fixedly connected to the front of the inner shell 1. A liquid delivery pipe 9 is fixedly connected to the top rear end of the inner shell 1. The infusion pipe 9 is positioned at the top of the anaerobic tank 4. A first extraction pipe 10 is fixedly connected to the bottom left side of the anaerobic tank 4. A material circulation pump 11 is fixedly connected to the other end of the first extraction pipe 10. The bottom of the material circulation pump 11 is fixedly connected to the outer casing 1. A first feeding pipe 12 is fixedly connected to the front end of the material circulation pump 11. The other end of the first feeding pipe 12 is fixedly connected to the bottom left side of the aerobic tank 5. A sludge extraction pipe 13 is fixedly connected to the bottom right side of the aerobic tank 5. A sludge pump 14 is fixedly connected to the other end of the sludge extraction pipe 13. The rear of the sludge pump 14 is fixedly connected to the partition plate 7. A sludge conveying pipe 15 is fixedly connected to the top of the sludge pump 14 for conveying sludge. The other end of pipe 15 is installed at the bottom of the flow guiding device 8, which is located above the right side of the sedimentation device 6. A second extraction pipe 16 is fixedly connected to the bottom of the sedimentation device 6. A feeding circulation pump 17 is fixedly connected to the other end of the second extraction pipe 16. A second feeding pipe 18 is fixedly connected to the other end of the feeding circulation pump 17. The other end of the second feeding pipe 18 is fixedly connected to the top front end of the anaerobic tank 4. A drain valve 19 is fixedly connected to the left side of the bottom front end of the aerobic tank 5. The outside of the drain valve 19 is fixedly connected to the outer shell 1. A top cover 2 is installed on the top of the outer shell 1. Inspection doors 3 are evenly distributed in front of the outer shell 1. Through this setting... Phosphorus and nitrogen can be removed directly through anaerobic tank 4. Then, under the action of pump 11, first pump pipe 10 and first feed pipe 12, the wastewater in anaerobic tank 4 enters aerobic tank 5 to continue the reaction. After the reaction is completed, under the action of sludge pump 14, sludge pumping pipe 13 and sludge conveying pipe 15, the sludge is sent to sedimentation device 6 to settle. Then, under the action of pump 17, second pump pipe 16 and second feed pipe 18, the filtered wastewater is sent back to anaerobic tank 4 for further treatment, realizing multi-stage treatment. Finally, the treated wastewater is discharged through drain valve 19.

[0050] like Figure 1-13As shown, the sedimentation device 6 includes a fixed box 61, an installation body 62 for limiting the installation of the filter body 66, a clamping plate 63, a rubber block 65, a filter body 66 for filtering sludge, and a handle 67 for installing and removing the filter body 66. Partitions 7 are fixedly connected to both sides of the fixed box 61. A second extraction pipe 16 is fixedly connected to the bottom of the fixed box 61. The installation body 62 is horizontally arranged and fixedly connected to the top of the fixed box 61. A clamping plate 63 is fixedly connected to the top right side of the installation body 62. The bottom of the clamping plate 63 has evenly distributed slots 64. The top right side of the filter body 66 is positioned within the slots 64 of the clamping plate 63. The top left side of the filter body 66... The filter body 66 is installed inside the mounting body 62, and several filter bodies 66 penetrate through the mounting body 62. Handles 67 are installed on the front and rear sides of the top of the filter body 66. The filter body 66 includes a mounting frame 661, a limiting frame 662, a filter screen sleeve 663 located below the flow guide device 8, a support frame 664, a rubber frame 665 for limiting the filter screen sleeve 663, an insertion rod 666, and an insertion block 667 for positioning the insertion rod 666. The bottom of the mounting frame 661 is fixedly connected to the limiting frame 662, and the bottom of the limiting frame 662 is fixedly connected to the support frame 664. The filter screen sleeve 663 is installed through the mounting frame 661 and the limiting frame 662. The top outer side of the filter screen sleeve 663 is provided with evenly distributed... The insert rod 666 has one end fixedly connected to the mounting frame 661, and the other end is hemispherical. An arc groove is formed on the outer side of the hemispherical end of the insert rod 666. Insert blocks 667 are provided on both sides of the arc groove. Evenly distributed insertion holes 668 are formed within the rubber frame 665. The insert rod 666 is placed within the insertion holes 668. Two insertion blocks 667 are fixedly connected to the insertion holes 668 within the rubber frame 665. The rubber frame 665 is located within the mounting frame 661, and the insert rod 666 is placed within the rubber frame 665. The outer side of the rubber frame 665 is tightly fitted to the filter screen sleeve 663. This arrangement allows wastewater to enter the filter screen sleeve 663. After step 63, the sludge is filtered through the filter screen sleeve 663, achieving rapid separation of sludge and wastewater. While the filter screen sleeve 663 is filtering the sludge, the limiting frame 662 and the support frame 664 can limit and support the filter screen sleeve 663 to prevent excessive sludge accumulation inside the filter screen sleeve 663 from causing damage. At the same time, after the rubber frame 665 is installed onto the mounting frame 661, the insertion rod 666 directly penetrates the filter screen sleeve 663 and is inserted into the rubber frame 665. At this time, the insertion block 667 clamps the insertion rod 666 under the elasticity of the rubber frame 665, preventing the rubber frame 665 from falling off the insertion rod 666, thereby fixing the top of the filter screen sleeve 663.

[0051] like Figure 5-13As shown, the mounting body 62 includes a support frame 621, a locking block 623, an insert plate 624, a sliding plate 625, a limiting plate 626, sliding rods 627, and a first spring 628. The outer side of the support frame 621 is fixedly connected to the fixed box 61, and the top right side of the support frame 621 is fixedly connected to the locking plate 63. The top left side of the support frame 621 has an installation groove 622 that corresponds one-to-one with the locking grooves 64 opened on the locking plate 63. Two horizontally arranged sliding rods 627 are fixedly connected to the inner wall of the installation groove 622, and two horizontally arranged limiting plates 626 are fixedly connected to the inner wall of the installation groove 622. The two sliding rods 627 are respectively set on two... On the front and rear sides of the limiting plate 626, the top of the support frame 621 is provided with a locking block 623 corresponding to the mounting groove 622. A limiting groove 629 is opened in the locking block 623. A sliding plate 625 is fixedly connected to the bottom of the locking block 623. The sliding plate 625 is set in the mounting groove 622 opened in the support frame 621, and the limiting plate 626 and the sliding rod 627 are arranged through the sliding plate 625. A first spring 628 is provided on the outside of the sliding rod 627. The filter body 66 is evenly arranged in the support frame 621. The mounting frame 661 is set above the support frame 621, and the bottom of the mounting frame 661 is in close contact with the support frame 621. The right side of the mounting frame 661 is set in the locking groove 64 opened in the locking plate 63. The mounting frame 661 is fitted with a rubber block 65. The left side of the mounting frame 661 is positioned within a limiting groove 629 provided by the locking block 623. Two horizontally arranged insert plates 624 are fixedly connected within the limiting groove 629 of the locking block 623. Two horizontally arranged slots 669 are provided on one side of the mounting frame 661 within the locking block 623. The insert plates 624 are positioned within the slots 669 of the mounting frame 661. A limiting frame 662 is positioned within a support frame 621. A support frame 664 is fitted with a filter screen sleeve 663. Handles 67 are fixedly connected to the front and rear sides of the top of the mounting frame 661. This configuration allows the mounting frame 661 to be supported by the support frame 621. Then, one side of the mounting frame 661 is inserted into the slot 64 of the card plate 63. The first spring 628 pushes the slide plate 625 to move, and the slide plate 625 drives the card block 623 to move until the card block 623 is installed on the outside of the mounting frame 661 under the action of the limiting groove 629. At the same time, under the action of the first spring 628, the mounting frame 661 and the rubber block 65 are tightly fitted together to achieve the positioning of the mounting frame 661. Meanwhile, the insert plate 624 of the card block 623 is inserted into the slot 669 of the mounting frame 661 to further limit the mounting frame 661 and make the installation of the mounting frame 661 more stable. At the same time, when the slide plate 625 moves, the limiting plate 626 can make the movement of the slide plate 625 more stable.

[0052] like Figure 3 , 4As shown in Figures 14, 15, and 16, the flow guiding device 8 includes a connecting box 81, a connecting pipe 82, a connecting body 83, a flow guiding pipe 84, a sealing body 85, and a limiting body 86. A partition plate 7 is fixedly connected to both the front and rear ends of the connecting box 81. A mud conveying pipe 15 is fixedly connected to the bottom of the connecting box 81 at one end in front of the partition plate 7. A uniformly distributed connecting pipe 82 is fixedly connected to the upper part of the connecting box 81 at the end away from the mud conveying pipe 15. The other end of the connecting pipe 82 is connected to the body 83. A flow guiding pipe 84 is fixedly connected to the end of the connecting body 83 away from the connecting pipe 82. A limiting body 86 is installed on the outer side of the end of the flow guiding pipe 84 located inside the connecting body 83. A sealing body 85 is provided on the outside of the limiting body 86. The sealing body 85 is located on the outside of the guide pipe 84 and is installed on one side of the connecting body 83. With this setting, after the sewage enters the connecting box 81, it gradually fills the connecting box 81. As the sewage continues to enter the connecting box 81, the water pressure in the connecting box 81 increases. At this time, the sewage enters the connecting pipe 82 under the action of water pressure. Then the sewage enters the guide pipe 84 through the connecting body 83. At the same time, the sealing body 85 seals the connecting body 83. Then the sewage in the guide pipe 84 flows downward into the filter screen sleeve 663 and is filtered by the filter screen sleeve 663.

[0053] like Figure 14-17As shown, the connecting body 83 includes a connecting shell 831, an arc-shaped plate 832, screws 833, a sliding shell 834, a rubber pad 835, a positioning block 836, an anti-detachment plate 837, a guide rod 838, and a second spring 839. Arc-shaped plates 832 are provided on both the upper and lower sides of the connecting shell 831. A sliding shell 834 is fixedly connected to the side of the arc-shaped plate 832 closest to the connecting shell 831. Two sliding shells 834 are arranged in a group on the upper and lower sides inside the connecting shell 831. A rubber pad 835 is fixedly connected to the side of the sliding shell 834 away from the arc-shaped plate 832. Screws 833 are provided on both the front and rear sides inside the arc-shaped plate 832. The thread 833 is threadedly connected to the connecting shell 831. An anti-detachment plate 837 is provided on the side of the sliding shell 834 away from the arc plate 832. A positioning block 836 is fixedly connected to the anti-detachment plate 837 away from the arc plate 832. A guide rod 838 is slidably arranged inside the positioning block 836, passing through the anti-detachment plate 837. Evenly distributed placement grooves are opened on the side of the sliding shell 834 away from the anti-detachment plate 837. The end of the guide rod 838 away from the positioning block 836 is fixedly connected to the placement groove opened in the sliding shell 834. A second spring 839 is located on the outside of the guide rod 838. The positioning block 836 passes through a rubber pad. 835, the bottom of the rubber pad 835 is tightly fitted to the connecting shell 831, the limiting body 86 is set inside the connecting shell 831, and the sealing body 85 is set behind the limiting body 86. With this setting, one end of the guide pipe 84 with the fixing ring can be directly placed inside the connecting shell 831. Then, the fixing plate 851 is installed on one side of the connecting shell 831 by bolts 853, realizing the installation of the guide pipe 84. At this time, sewage can enter the filter screen sleeve 663 for filtration through the connecting pipe 82, the connecting shell 831 and the guide pipe 84. At this time, the end of the guide pipe 84 with the fixing ring 861 can... The guide pipe 84 can be moved within the connecting housing 831, thus removing it from above the mounting frame 661. This allows the installation and removal of the filter screen sleeve 663 to be unaffected by the guide pipe 84. Simultaneously, as the guide pipe 84 moves, the second spring 839 pushes the positioning block 836 into the positioning groove 865 of the fixing ring 861, thereby positioning the fixing ring 861 and preventing the guide pipe 84 from rotating. This ensures that the outlet of the guide pipe 84 is always positioned above the filter screen sleeve 663, preventing wastewater from entering the fixing box 61 directly without passing through the filter screen sleeve 663, thus improving the filtration effect.

[0054] like Figure 14-20As shown, the sealing body 85 includes a fixing plate 851, a rubber disc 852, a bolt 853, a rubber ring 854, and a limiting ring 855. The rubber disc 852 is fixedly connected to the side of the fixing plate 851 near the connecting shell 831, and the rubber disc 852 fits tightly against the connecting shell 831. A bolt 853 is provided inside the fixing plate 851, penetrating the rubber disc 852. The end of the bolt 853 away from the fixing plate 851 is threadedly connected to the connecting shell 831. A rubber ring 854 is fixedly connected to the side of the rubber disc 852 near the connecting shell 831, and a limiting ring 855 is provided inside the rubber ring 854. The limiting body 86 includes a fixing ring 861, a insertion ring 862, a tensioning ring 863, and... A sealing ring 864 and a fixing ring 861 are fixedly connected to the inner side of the guide tube 84. A plug ring 862 is fixedly connected to the side of the fixing ring 861 away from the connecting tube 82. A tension ring 863 is fixedly connected to the outer side of the plug ring 862. Both the plug ring 862 and the tension ring 863 are located within a rubber ring 854. The side of the fixing ring 861 away from the connecting tube 82 is tightly fitted to the rubber ring 854. Positioning grooves 865 are provided on both the upper and lower sides of the fixing ring 861. Positioning blocks 836 are provided within the positioning grooves 865 of the fixing ring 861. The outer ring of the fixing ring 861 near the rubber ring 854 is arc-shaped. A limiting ring 855 is located on the outer side of the guide tube 84. Two rubber rings are arranged in a group inside the insert ring 862, and the outer side of the rubber ring 854 is tightly fitted with the connecting shell 831. The guide pipe 84 is located above the filter screen sleeve 663. With this arrangement, when the fixing plate 851 is installed on one side of the connecting shell 831 by bolts 853, the rubber disc 852 seals between the fixing plate 851 and the connecting shell 831. Then, when the fixing ring 861 moves, the fixing ring 861 drives the tension ring 863 into the rubber ring 854 through the insert ring 862, so that the outer side of the rubber ring 854 is tightly fitted with the connecting shell 831, achieving a seal. At the same time, under the action of the second spring 839 and the positioning block 836, the fixing ring 854 can be moved. One side of 61 is always in contact with the rubber ring 854 for further sealing. At this time, under the action of the limiting ring 855, the inner ring of the rubber ring 854 can be supported, reducing the deformation of the inner ring of the rubber ring 854, so that the inner ring of the rubber ring 854 is not tightly in contact with the guide pipe 84, thus making the movement of the guide pipe 84 more convenient. At the same time, the outer side of the sealing ring 864 is in contact with the connecting shell 831, which can prevent sewage from contacting the positioning block 836 and prevent sewage leakage. It can also prevent sewage from entering between the positioning block 836 and the sliding shell 834, preventing blockage between the positioning block 836 and the sliding shell 834, and making the positioning block 836 move more smoothly in the sliding shell 834.

[0055] Workflow: First, power is connected, and domestic sewage filtered through the screen is sent into the anaerobic tank 4 via the infusion pipe 9. At this time, the multi-stage AO treatment equipment is started via the controller. Chemical solution is added to the anaerobic tank 4, and the stirring device in the anaerobic tank 4 is started. The stirring device drives the domestic sewage and microorganisms to mix thoroughly. The domestic sewage undergoes phosphorus and nitrogen removal in the anaerobic tank 4 through the microorganisms. After phosphorus and nitrogen removal, the domestic sewage is sent into the aerobic tank 5 by the first suction pipe 10 and the first delivery pipe 12 under the action of the suction circulation pump 11. Then, chemical solution is added to the aerobic tank 5, and the stirring device ensures that the domestic sewage and chemical solution in the aerobic tank 5 are fully mixed and reacted. The aerobic tank 5 further removes organic matter from the sewage. After the reaction is completed in the aerobic tank 5, the sludge pump 14 is controlled by the controller to send sludge into the connecting box 81 through the sludge suction pipe 13 and the sludge delivery pipe 15. As the sewage in the connecting box 81 gradually increases, the sewage gradually enters the connecting pipe 82. As wastewater enters the connecting box 81, it gradually flows into the connecting shell 831 under water pressure. The wastewater then enters the guide pipe 84 through the connecting shell 831, which sends it into the filter screen 663 below. The filter screen 663 filters out solid sediment from the wastewater. Afterward, the wastewater enters the fixed tank 61. Once the wastewater in the aerobic tank 5 has been transferred, the wastewater from the anaerobic tank 4, after reaction, is sent to the aerobic tank 5 via the first extraction pipe 10 and the first feeding pipe 12 using the pump 11 for further treatment. Meanwhile, the wastewater filtered in the fixed tank 61 is sent to the anaerobic tank 4 via the second extraction pipe 16 and the second feeding pipe 18 using the pump 17. Further chemical reactions are carried out by adding chemicals to the anaerobic tank 4, achieving multi-stage wastewater treatment. After treatment, the drain valve 19 is opened to discharge the treated wastewater. If there is excessive sludge in the filter screen 663, please refer to... Figure 1-4 Wastewater from the fixed shell is pumped into the anaerobic tank 4 via the second extraction pipe 16 and the second feed pipe 18 by the feeding circulation pump 17. At this time, workers move to the top of the outer shell 1 using a ladder, then open the top cover 2. Please refer to [further instructions]. Figure 14-20 The guide tube 84 is pushed, which in turn moves the fixing ring 861. The fixing ring 861 then moves the insertion ring 862 and the tensioning ring 863. Simultaneously, the fixing ring 861 pushes the positioning block 836 through the positioning groove 865. The positioning block 836 slides within the sliding shell 834, and at the same time, the positioning block 836 pushes the anti-detachment plate 837 to slide. The second spring 839 is compressed until the fixing ring 861 moves away from below the positioning block 836. At this point, the guide tube 84 can be rotated, causing the fixing ring 861 to rotate. This moves the guide tube 84 above the clamping plate 63. Then, please refer to... Figure 5-13The locking block 623 is pushed, causing the sliding plate 625 to slide within the mounting slot 622 of the support frame 621. Simultaneously, the sliding plate 625 slides outside the limiting plate 626 and the sliding rod 627, compressing the first spring 628. As the locking block 623 gradually moves away from the mounting frame 661, the insert plate 624 gradually moves away from the slot 669 of the mounting frame 661. After the locking block 623 moves to the appropriate position, the mounting frame 661 moves to the left. After the mounting frame 661 leaves the slot 64 of the locking plate 63, the lifting device and handle 67 move the mounting frame 661 upwards. The mounting frame 661, through the limiting frame 662 and the support frame 664, lifts the filter screen 663 containing sludge upwards until the filter screen 663 is removed. Then, the sludge inside the filter screen sleeve 663 can be removed and processed uniformly. Next, the rubber frame 665 can be removed directly. At this point, the filter screen sleeve 663 can be removed for cleaning or replacement. Then, the filter screen sleeve 663 is placed on the support frame 664 through the mounting frame 661 and the limiting frame 662. The upper end of the filter screen sleeve 663 is installed on the outside of the insertion rod 666. Then, the rubber frame 665 is installed into the mounting frame 661. At this point, the insertion rod 666 is inserted into the insertion hole 668 of the rubber frame 665. The insertion rod 666 pushes the insertion block 667 to move through its hemispherical end. The insertion block 667 causes the rubber frame 665 to deform. As the insertion rod 666 moves, the arc groove on the insertion rod 666 moves between the two insertion blocks 667, and the insertion blocks 667 are inserted into the insertion hole 666. The arc groove is used to position the insertion rod 666. After the rubber frame 665 is fully inserted into the mounting frame 661, the top of the filter screen sleeve 663 can be limited. At this time, the support frame 664 can support the bottom and outside of the filter screen sleeve 663 to prevent the sludge from damaging the filter screen sleeve 663 by its own weight. Then, the support frame 664 is passed through the support frame 621 in the reverse manner of the above steps until the bottom of the mounting frame 661 is in contact with the support frame 621. Then, the mounting frame 661 is pushed into the slot 64 opened in the card plate 63. At this time, the card block 623 is released, and the first spring 628 pushes the card block 623 to move through the slide plate 625. The card block 623 is locked on the outside of the mounting frame 661 through the opening limiting groove 629. At the same time, the card block The insert plate 624 of 623 is inserted into the slot 669 of the mounting frame 661. Under the action of the spring force of the first spring 628, the locking block 623 pushes the mounting frame 661, making one side of the mounting frame 661 fit tightly against the rubber block 65. After the mounting frame 661 is installed, the guide tube 84 is moved to the left until the bottom end of the guide tube 84 leaves the locking plate 63. Then, the guide tube 84 is rotated so that the left end of the guide tube 84 faces downward. Continuing to rotate the guide tube 84, the guide tube 84 drives the fixing ring 861 to move. The fixing ring 861 contacts the bottom of the positioning block 836 through the arc-shaped outer ring. At this time, the fixing ring 861 contacts the arc-shaped position at the bottom of the positioning block 836 through the arc-shaped outer ring. As the fixing ring 861 moves, it gradually pushes the positioning block 836 upward.Simultaneously, the fixing ring 861 drives the insertion ring 862 and tension ring 863 to insert into the rubber ring 854. At this time, the insertion ring 862 and tension ring 863 push the outer side of the rubber ring 854 to deform, making the outer side of the rubber ring 854 contact the connecting shell 831 more tightly to achieve a seal, until one side of the fixing ring 861 is tightly fitted with the rubber ring 854. At this time, under the action of the second spring 839, the positioning block 836 is pushed to move towards the fixing ring 861 until the positioning block 836 is engaged in the positioning groove 865 of the fixing ring 861. The positioning block 836 can position the fixing ring 861 to prevent the fixing ring 861 from rotating, and at the same time, it can prevent the guide tube 84 from rotating, so that the guide tube... The outlet hole of 84 is always positioned directly above the filter screen sleeve 663 to prevent sludge from entering the fixed box 61 directly without passing through the filter screen sleeve 663, thus making filtration more stable. Simultaneously, the outer side of the sealing ring 864 is tightly fitted with the connecting shell 831 to prevent sludge from entering between the positioning block 836 and the sliding shell 834. Meanwhile, the rubber gasket 835 is respectively fitted with the connecting shell 831 and the sliding shell 834 to prevent sewage leakage and to make the up-and-down movement of the positioning block 836 smoother. After the filter screen sleeve 663 is cleaned, sludge filtration can continue, facilitating sludge collection. After sewage treatment is complete, the treated sewage in the aerobic tank 5 can be discharged directly by opening the drain valve 19.

[0056] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make various improvements, modifications, or variations without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A multi-stage AO treatment device for domestic sewage, comprising a housing (1) for overall integrated protection, a sedimentation device (6) for sludge sedimentation, and a flow guiding device (8) for sludge conveying, characterized in that: The outer shell (1) has two vertically placed partitions (7) fixedly connected to both sides for separation. Two partitions (7) are installed on both sides of the sedimentation device (6). The front partition (7) and the rear partition (7) are installed at the front and rear ends of the flow guiding device (8), respectively. An anaerobic tank (4) is fixedly connected to the rear of the outer shell (1), and an aerobic tank (5) is fixedly connected to the front of the outer shell (1). A delivery pipe (9) is fixedly connected to the rear end of the top of the outer shell (1). The front end of the pipe (9) is set at the top of the anaerobic tank (4). A first extraction pipe (10) is fixedly connected to the bottom left side of the anaerobic tank (4). A extraction circulation pump (11) is fixedly connected to the other end of the first extraction pipe (10). The bottom of the extraction circulation pump (11) is fixedly connected to the outer shell (1). A first feeding pipe (12) is fixedly connected to the front end of the extraction circulation pump (11). The other end of the first feeding pipe (12) is fixedly connected to the bottom left side of the aerobic tank (5). The bottom right side of the aerobic tank (5) is fixedly connected to the first feeding pipe (12). A sludge suction pipe (13) is fixedly connected to the other end of the sludge suction pipe (13), and a sludge pump (14) is fixedly connected to the rear of the sludge pump (14) and a partition plate (7). A sludge conveying pipe (15) is fixedly connected to the top of the sludge pump (14), and the other end of the sludge conveying pipe (15) is installed at the bottom of a flow guiding device (8). The flow guiding device (8) is located above the right side of the sedimentation device (6). A second material extraction pipe (16) is fixedly connected to the bottom of the sedimentation device (6). The other end is fixedly connected to a feeding circulation pump (17), the other end of which is fixedly connected to a second feeding pipe (18), the other end of which is fixedly connected to the top of the front end of the anaerobic tank (4), a drain valve (19) is fixedly connected to the left side of the bottom front end of the aerobic tank (5), the outside of the drain valve (19) is fixedly connected to the outer shell (1), a top cover (2) is installed on the top of the outer shell (1), and maintenance doors (3) are evenly distributed in front of the outer shell (1). The flow guiding device (8) includes a connecting box (81), a connecting pipe (82), a connecting body (83), a flow guiding pipe (84), a sealing body (85), and a limiting body (86). The front and rear ends of the connecting box (81) are fixedly connected to partitions (7). The bottom of the connecting box (81) at one end of the partition (7) is fixedly connected to a mud conveying pipe (15). The upper part of the connecting box (81) away from the mud conveying pipe (15) is fixedly connected to a connecting pipe (82) that is evenly distributed. The other end of the connecting pipe (82) is connected to the body (83). The end of the connecting body (83) away from the connecting pipe (82) is fixedly connected to a flow guiding pipe (84). The limiting body (86) is installed on the outer side of the end of the flow guiding pipe (84) inside the connecting body (83). The sealing body (85) is provided on the outer side of the limiting body (86). The sealing body (85) is located on the outer side of the flow guiding pipe (84). The sealing body (85) is installed on one side of the connecting body (83). The connecting body (83) includes a connecting shell (831), an arc-shaped plate (832), screws (833), a sliding shell (834), a rubber pad (835), a positioning block (836), an anti-detachment plate (837), a guide rod (838), and a second spring (839). The connecting shell (831) has arc-shaped plates (832) on both its upper and lower sides. A sliding shell (834) is fixedly connected to the side of the arc-shaped plate (832) closest to the connecting shell (831). Two sliding shells (834) are arranged in a group on the upper and lower sides inside the connecting shell (831). A rubber pad (835) is fixedly connected to the side of the sliding shell (834) away from the arc-shaped plate (832). Screws (833) are provided on both the front and rear sides inside the arc-shaped plate (832). The screws (833) are threadedly connected to the connecting shell (831). The sliding shell (834) is located away from the arc-shaped plate (832). One side is provided with an anti-detachment plate (837), and the anti-detachment plate (837) is fixedly connected to a positioning block (836) away from the arc plate (832). A guide rod (838) is slidably arranged in the positioning block (836), and the guide rod (838) passes through the anti-detachment plate (837). A uniformly distributed placement groove is opened on the side of the sliding shell (834) away from the anti-detachment plate (837). One end of the guide rod (838) away from the positioning block (836) is fixedly connected to the placement groove opened in the sliding shell (834). The second spring (839) is arranged on the outside of the guide rod (838). The positioning block (836) passes through the rubber pad (835). The bottom of the rubber pad (835) is tightly fitted with the connecting shell (831). The limiting body (86) is arranged in the connecting shell (831). The sealing body (85) is arranged behind the limiting body (86).

2. The multi-stage AO treatment equipment for domestic sewage according to claim 1, characterized in that: The sedimentation device (6) includes a fixed box (61), an installation body (62) for limiting the installation of the filter body (66), a clamping plate (63), a rubber block (65), a filter body (66) for filtering sludge, and a handle (67) for installing and removing the filter body (66). Partitions (7) are fixedly connected to both sides of the fixed box (61). A second extraction pipe (16) is fixedly connected to the bottom of the fixed box (61). A horizontally arranged... The mounting body (62) has a card plate (63) fixedly connected to the top right side of the mounting body (62). The card plate (63) has evenly distributed card slots (64) at the bottom. The top right side of the filter body (66) is located in the card slots (64) of the card plate (63). The top left side of the filter body (66) is located in the mounting body (62). Several filter bodies (66) penetrate the mounting body (62). The handle (67) is installed on the front and rear sides of the top of the filter body (66).

3. The multi-stage AO treatment equipment for domestic sewage according to claim 2, characterized in that: The mounting body (62) includes a support frame (621), a locking block (623), a insert plate (624), a sliding plate (625), a limiting plate (626), a sliding rod (627), and a first spring (628). The outer side of the support frame (621) is fixedly connected to the fixed box (61), and the top right side of the support frame (621) is fixedly connected to the locking plate (63). The top left side of the support frame (621) has an installation groove (622) that corresponds one-to-one with the locking groove (64) of the locking plate (63). The support frame (621) is fixedly connected to two horizontally arranged sliding rods (627) arranged front and back through the inner wall of the installation groove (622). There are two horizontally arranged limiting plates (626) and two sliding rods (627) respectively arranged on the front and rear sides of the two limiting plates (626). The top of the support frame (621) is provided with a locking block (623) corresponding to the mounting groove (622). The locking block (623) has a limiting groove (629) in it. The bottom of the locking block (623) is fixedly connected to a sliding plate (625). The sliding plate (625) is arranged in the mounting groove (622) of the support frame (621). The limiting plate (626) and the sliding rod (627) are arranged through the sliding plate (625). The outer side of the sliding rod (627) is provided with a first spring (628). The filter body (66) is evenly arranged in the support frame (621).

4. The multi-stage AO treatment equipment for domestic sewage according to claim 3, characterized in that: The filter body (66) includes a mounting frame (661), a limiting frame (662), a filter screen sleeve (663) disposed below the flow guide device (8), a support frame (664), a rubber frame (665) for limiting the filter screen sleeve (663), an insert rod (666), and an insert block (667) for positioning the insert rod (666). The mounting frame (661) is fixedly connected to the bottom of the limiting frame (662), and the support frame (664) is fixedly connected to the bottom of the limiting frame (662). The filter screen sleeve (663) is disposed through the mounting frame (661) and the limiting frame (662). The top outer side of the filter screen sleeve (663) is disposed through evenly distributed insert rods (666). One end of the insert rod (666) The insertion rod (666) is fixedly connected in the mounting frame (661). The other end of the insertion rod (666) is hemispherical. An arc groove is opened on the outer side of the hemispherical end of the insertion rod (666). Insert blocks (667) are provided on both sides of the arc groove of the insertion rod (666). The rubber frame (665) has evenly distributed insertion holes (668). The insertion rod (666) is set in the insertion hole (668). The two insertion blocks (667) are fixedly connected in a group to the insertion hole (668) of the rubber frame (665). The rubber frame (665) is set in the mounting frame (661). The insertion rod (666) is set in the rubber frame (665). The outer side of the rubber frame (665) is tightly fitted with the filter screen sleeve (663).

5. A multi-stage AO treatment device for domestic sewage according to claim 4, characterized in that: The mounting frame (661) is positioned above the support frame (621), and the bottom of the mounting frame (661) is in close contact with the support frame (621). The right side of the mounting frame (661) is positioned within the slot (64) of the card plate (63), and a rubber block (65) is provided within the slot (64) of the card plate (63). The mounting frame (661) and the rubber block (65) are in close contact with each other. The left side of the mounting frame (661) is positioned within the limiting groove (629) of the card block (623), and the limiting groove (629) of the card block (623) is in close contact with each other. 629) There are two horizontally arranged insert plates (624) fixedly connected inside. The mounting frame (661) is set in the card block (623) with two horizontally arranged slots (669) on one side. The insert plates (624) are set in the slots (669) opened in the mounting frame (661). The limiting frame (662) is set in the support frame (621). The support frame (664) and the filter screen sleeve (663) fit together. The mounting frame (661) has handles (67) fixedly connected to the front and rear sides of the top.

6. The multi-stage AO treatment equipment for domestic sewage according to claim 1, characterized in that: The sealing body (85) includes a fixing plate (851), a rubber disc (852), a bolt (853), a rubber ring (854), and a limiting ring (855). The rubber disc (852) is fixedly connected to the side of the fixing plate (851) near the connecting shell (831). The rubber disc (852) fits tightly against the connecting shell (831). A bolt (853) penetrating the rubber disc (852) is provided inside the fixing plate (851). The end of the bolt (853) away from the fixing plate (851) is threadedly connected to the connecting shell (831). The rubber ring (854) is fixedly connected to the side of the rubber disc (852) near the connecting shell (831). The rubber ring (854) is provided with a limiting ring (855). The limiting body (86) includes a fixing ring (861), a plug ring (862), a tensioning ring (863) and a sealing ring (864). The inner side of the fixing ring (861) is fixedly connected to the guide pipe (84). The side of the fixing ring (861) away from the connecting pipe (82) is fixedly connected to the plug ring (862). The outer side of the plug ring (862) is fixedly connected to the tensioning ring (863). The plug ring (862) and the tensioning ring (863) are both set inside the rubber ring (854). The side of the fixing ring (861) away from the connecting pipe (82) is tightly fitted with the rubber ring (854).

7. A multi-stage AO treatment device for domestic sewage according to claim 6, characterized in that: The fixing ring (861) has positioning grooves (865) on both the upper and lower sides. The positioning grooves (865) of the fixing ring (861) are provided with positioning blocks (836). The outer ring of the fixing ring (861) near the rubber ring (854) is arc-shaped. The limiting ring (855) is located outside the guide tube (84). The two limiting rings (855) are set in a group inside the insertion ring (862). The outer side of the rubber ring (854) is tightly fitted with the connecting shell (831). The guide tube (84) is located above the filter screen sleeve (663).

8. A multi-stage AO treatment device and phosphorus removal method for domestic sewage according to any one of claims 1-7, characterized in that, Includes the following steps: Step 1: First, connect the power supply and send the domestic sewage filtered by the grid into the anaerobic tank (4) through the infusion pipe (9). At this time, start the multi-stage AO treatment equipment through the controller. Add the chemical solution into the anaerobic tank (4) and start the stirring device in the anaerobic tank (4). The stirring device drives the domestic sewage and microorganisms to mix fully. The domestic sewage undergoes phosphorus and nitrogen removal in the anaerobic tank (4) through microorganisms. Step 2: After phosphorus and nitrogen removal, the domestic sewage is fed into the aerobic tank (5) by the first suction pipe (10) and the first feed pipe (12) under the action of the suction circulation pump (11). Then, the chemical solution is added to the aerobic tank (5), and the domestic sewage in the aerobic tank (5) is fully mixed and reacted with the chemical solution by the stirring device. The organic matter in the sewage is further removed through the aerobic tank (5). Step 3: After the reaction is completed in the aerobic tank (5), the sludge pump (14) is controlled by the controller to send the sludge into the connecting box (81) through the sludge suction pipe (13) and the sludge conveying pipe (15). As the amount of sludge in the connecting box (81) gradually increases, the sludge gradually enters the connecting pipe (82). As the sludge enters the connecting box (81), the sludge in the connecting box (81) gradually enters the connecting shell (831) under the action of water pressure. The sludge enters the guide pipe (84) through the connecting shell (831). The guide pipe (84) sends the sludge into the filter screen sleeve (663) below. The filter screen sleeve (663) filters the solid sediment in the sludge. Then the sewage enters the fixed box (61). Step 4: After the wastewater in the aerobic tank (5) is transferred, the wastewater after reaction in the anaerobic tank (4) is sent into the aerobic tank (5) through the first suction pipe (10) and the first feed pipe (12) by the suction circulation pump (11) for further treatment. At this time, the wastewater filtered in the fixed box (61) is sent into the anaerobic tank (4) through the second suction pipe (16) and the second feed pipe (18) by the feed circulation pump (17). The wastewater is further reacted by adding chemical solution to the anaerobic tank (4) to achieve multi-stage treatment of wastewater circulation. After the wastewater treatment is completed, the drain valve (19) is opened to discharge the treated wastewater.

Images