Flocculation sedimentation device and epichlorohydrin wastewater pretreatment process

Abstract

The invention relates to the technical field of wastewater treatment, and discloses a flocculent precipitation device and an epichlorohydrin wastewater pretreatment process, the flocculent precipitation device comprises an outer tank, an inner tank and a cover body covering the outer tank, a spiral sheet is connected between the inner wall of the outer tank and the outer wall of the inner tank, and the spiral sheet forms a spiral channel; a water inlet pipe is arranged on the outer wall of the outer tank, is communicated with the spiral channel and extends along the tangential direction of the spiral channel; an overflow pipe is arranged on the inner wall of the inner tank, the lower end of the overflow pipe is communicated with the side wall of the lower end of the inner tank, and an overflow port is formed in the upper end of the overflow pipe; a drain pipe is arranged at the upper end of the inner tank, the position of the drain pipe is lower than that of a water inlet of the spiral channel, and the drain pipe penetrates out of the side wall of the outer tank. The flocculation efficiency of the wastewater can be improved.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment equipment, and in particular to a flocculation sedimentation device and a pretreatment process for epichlorohydrin wastewater. Background Technology

[0002] In the epichlorohydrin wastewater treatment process, the combination of "flocculator + sedimentation tank" is a highly efficient and economical physicochemical pretreatment unit. It transforms pollutants in wastewater that are difficult to settle naturally into easily settling flocs through flocculation, and uses the sedimentation tank to achieve solid-liquid separation. This significantly reduces the turbidity, suspended solids, and some organic load of the wastewater, clearing the way for subsequent, more refined treatment and making it a crucial component of the entire wastewater treatment system.

[0003] Currently, sedimentation tanks mainly consist of a tank body with an inlet pipe on the upper side wall and a drain outlet at the lower end. A drain pipe is also installed on the side wall of the tank. Wastewater enters the tank through the inlet pipe, and flocculants and coagulants are added to the tank to cause flocculation and sedimentation of the components in the wastewater. The sediment is discharged from the drain outlet, while the water flows out through the drain pipe. However, if water is continuously fed in and discharged, the flocculants can easily be discharged through the drain pipe along with the wastewater. Furthermore, if flocculation and sedimentation occur for a period after water is fed in before continued water feeding, the treatment efficiency is slow. Therefore, there is still room for improvement. Summary of the Invention

[0004] Firstly, this application provides a flocculation and sedimentation device.

[0005] The technical solution adopted in this application is as follows: A flocculation and sedimentation device includes an outer tank and an inner tank. A lid covers the outer tank. A spiral blade connects the inner wall of the outer tank and the outer wall of the inner tank, forming a spiral channel. An inlet pipe is provided on the outer wall of the outer tank, communicating with the spiral channel and extending tangentially along it. An overflow pipe is provided on the inner wall of the inner tank, its lower end communicating with the lower side wall of the inner tank, and an overflow outlet is provided at its upper end. A drain pipe is provided at the upper end of the inner tank, positioned below the inlet of the spiral channel, and extending through the side wall of the outer tank. The outer tank has a drain port at its lower end and a closing plate for opening and closing the drain port. The inner tank has a discharge port at its lower end and a sealing plate for opening and closing the discharge port. The sealing plate has a through hole that can coincide with or be offset from the discharge port. The cover has a driving component that can be linked with the closing plate and the sealing plate. The driving component can first drive the closing plate to open the drain port and then drive the sealing plate to rotate to open the discharge port.

[0006] By adopting the above technical solution and setting a spiral channel between the inner and outer tanks, the reaction time and path of wastewater and flocculant can be greatly extended, allowing the flocculant to better neutralize and precipitate substances in the wastewater. The wastewater overflows from the top of the overflow pipe into the inner tank, reducing the possibility of flocculent particles in the outer tank entering the inner tank, and allowing the flocculent precipitate to settle better at the bottom of the outer tank.

[0007] Optionally, the driving component includes a power shaft rotatably mounted on the cover, a power source for driving the drive shaft to rotate, a drive cylinder rotatably mounted in the cover, and a drive cylinder rotatably connected to the lower end of the drive cylinder. The drive cylinder rotatably passes through the inner tank and extends into the outer tank. The opening and closing plate is threadedly connected to the outer wall of the drive cylinder, and a guide is provided between the lower end of the outer tank and the opening and closing plate. The lower end of the power shaft extends into the inner cavity of the drive cylinder, and a switching component is provided on the outer wall of the power shaft. The power shaft cooperates with the drive cylinder through the switching component, so that the power shaft rotates to drive the opening and closing plate to move downward. Then, the switching component can switch to cooperate with the drive cylinder to drive the sealing plate to rotate and open the discharge port.

[0008] By adopting the above technical solution, the drive cylinder rotates, driving the opening and closing plate to move, thereby discharging the sediment in the outer tank. After a long period of time, some sediment will also settle in the inner tank. In this case, the drain port is first opened by the drive cylinder, and then the switching component is used to rotate the drive cylinder, thereby opening the discharge port, so that the sediment in the inner tank can also be discharged.

[0009] Optionally, a fixed seat is provided at the lower end of the power shaft, and a meshing column is slidably provided on the side wall of the fixed seat. The meshing column extends along the circumferential direction of the fixed seat, and a first elastic element is provided between the meshing column and the fixed seat. A first tooth is provided in the drive cylinder at a position corresponding to the fixed seat, and the first tooth is evenly distributed along the circumference of the drive cylinder. A slide rod is slidably provided on the fixed seat, and a connecting ring is provided at the upper end of the slide rod. A reset element is provided between the connecting ring and the surface of the fixed seat. The outer wall of the connecting ring is provided with meshing teeth, and the inner wall of the drive cylinder is provided with second teeth, and the second teeth are evenly distributed along the circumference of the drive cylinder. When the power shaft rotates, the switching member can move along the axis of the power shaft. The switching member abuts against the connecting ring. When the switching member moves away from the drive cylinder, the reset member drives the slide rod to slide away from the fixed seat, and the slide rod and the meshing column separate, so that the first elastic member drives the meshing column to slide into the fixed seat. The switching member continues to move, and the meshing teeth begin to mesh with the second teeth.

[0010] By adopting the above technical solution, the rotation of the power shaft first drives the rotation of the drive cylinder. When the first tooth and the meshing column separate, the rotation of the power shaft can start to drive the cylinder to rotate.

[0011] Optionally, the cover body is provided with a mounting post, the upper end of the drive cylinder is rotatably connected to the lower end of the mounting post, the power shaft rotatably passes through the mounting post, the switching component is a threaded seat, the threaded seat is threadedly connected to the outer wall of the power shaft, and the mounting post is provided with a limit rod, the limit rod slidingly passing through the threaded seat.

[0012] By adopting the above technical solution, the threaded seat moves along the axis of the power shaft, which can squeeze the connecting ring to drive the slide rod to move.

[0013] Optionally, the fixed base has a sliding groove that passes through the side wall of the fixed base, the engaging column is slidably connected to the sliding groove, the first elastic element is connected between the sliding groove and the outer wall of the engaging column, the fixed base has a through groove for the sliding rod to pass through, the through groove is connected to the sliding groove, when the sliding rod passes through the through groove, it can drive the engaging column to slide outward, and the first elastic element provides a resetting force for the engaging column.

[0014] By adopting the above technical solution, the slide rod passes through the slot, which can push the meshing column to slide and mesh with the first tooth. After the slide rod and the meshing column separate, the first elastic element drives the meshing column and the first tooth to separate.

[0015] Optionally, the outer wall of the drive cylinder is provided with a scraper, which abuts against the lower side wall of the outer tank. The side wall of the overflow pipe is provided with an opening, and a cover plate is provided on the overflow pipe to cover the opening. When the drive cylinder rotates, it can intermittently drive the opening to open and close.

[0016] By adopting the above technical solution, when the cylinder is rotated, it can drive the scraper to move, thereby scraping off the deposits on the inner wall of the lower end of the outer tank. In addition, during the rotation of the cylinder, the opening is opened intermittently, so that the water in the inner tank can flow out from the overflow pipe, thereby rinsing the inner wall of the outer tank while scraping it.

[0017] Optionally, the cover plate is provided with a guide block, the overflow pipe is provided with a guide groove, the guide block is slidably disposed in the guide groove, and a second elastic element is provided between the guide block and the guide groove. The lower end of the cover plate is provided with an abutment post, which slides through the bottom surface of the inner tank. The upper surface of the sealing plate is provided with a positioning groove, and the two ends of the positioning groove are inclined. When the sealing plate rotates, the abutment post abuts against the threaded groove, the upper end of the cover plate separates from the opening, and the continued rotation of the sealing plate can push the abutment post to slide upward.

[0018] By adopting the above technical solution, the cover plate moves up and down to close or open the opening, thereby achieving the effect of intermittent drainage.

[0019] Optionally, the spiral blade has water inlets, and multiple water inlets are spaced apart along the spiral direction of the spiral blade. A mixing plate is provided on the lower side of each water inlet of the spiral blade, and the mixing plate is inclined in the spiral direction.

[0020] By adopting the above technical solution, the mixing plate can promote the mixing effect of flocculant and wastewater, making its distribution more uniform.

[0021] Secondly, this application provides a pretreatment process for epichlorohydrin wastewater.

[0022] A pretreatment process for epichlorohydrin wastewater includes the following steps: (1) The pH of the wastewater is adjusted to 4-7, and then the wastewater is transported to the top of the micro-electrolysis reactor filled with iron-carbon balls for micro-electrolysis pretreatment of the epichlorohydrin wastewater; (2) The wastewater treated in step (1) is transported to the Fenton reactor and ferrous chloride and oxidant are added. The reaction is carried out at 50-90℃. (3) After adjusting the pH of the wastewater treated in step (2) to neutral, the wastewater is sent to the flocculation sedimentation device in the above scheme, and flocculant and coagulant aid are added at the same time. After flocculation, the flocculated sediment is discharged from the sewage outlet in the sedimentation device, and the flocculated wastewater is discharged from the drain pipe.

[0023] In summary, this application includes at least one of the following beneficial effects: 1. By setting a spiral channel between the outer and inner tanks, the flow path of wastewater is improved, thereby increasing the reaction time between flocculant and wastewater, and better forming flocculation and sedimentation. Wastewater can enter the inner tank through the overflow pipe and then be discharged from the drain pipe. The overflow pipe can reduce the amount of flocculent particles in the outer tank entering the inner tank, further improving the flocculation effect. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 This is a cross-sectional schematic diagram of an embodiment of this application; Figure 3 This is a cross-sectional schematic diagram of the inner tank in an embodiment of this application; Figure 4 This is an exploded view of the fixing base in an embodiment of this application; Figure 5 This is a cross-sectional schematic diagram of the fixing seat in the embodiment of this application; Figure 6 This is an exploded view of the cover plate in an embodiment of this application.

[0025] Explanation of reference numerals in the attached drawings: 1. Outer tank; 2. Inner tank; 3. Cover; 4. Spiral blade; 5. Spiral channel; 6. Inlet pipe; 7. Overflow pipe; 8. Overflow outlet; 9. Drain pipe; 10. Sewage outlet; 11. Opening / closing plate; 12. Discharge outlet; 13. Sealing plate; 14. Through hole; 15. Driving component; 151. Power shaft; 152. Power source; 153. Drive cylinder; 154. Drive cylinder; 16. Guide component; 17. Switching component; 171. Threaded seat; 18. Fixed seat; 19. Meshing 20. First elastic element; 21. First tooth; 22. Slide rod; 23. Connecting ring; 24. Reset element; 25. Second tooth; 26. Mounting column; 27. Limiting rod; 28. Sliding groove; 29. ​​Through groove; 30. Scraper; 31. Opening; 32. Cover plate; 33. Guide block; 34. Guide groove; 35. Second elastic element; 36. Abutting column; 37. Drop groove; 38. Water outlet; 39. Mixing plate; 40. Liquid outlet pipe; 41. Engaging tooth; 42. Through port. Detailed Implementation

[0026] The present application will be further described in detail below with reference to the accompanying drawings.

[0027] Example 1 This application discloses a flocculation and sedimentation device. (Refer to...) Figure 1 and Figure 2 The system includes an outer tank 1 and an inner tank 2. The inner tank 2 is located inside the cavity of the outer tank 1. A cover 3 is installed on the outer tank 1, which closes onto the outer tank 1. A spiral blade 4 connects the inner wall of the outer tank 1 and the outer wall of the inner tank 2. The spiral blade 4 is spirally arranged downwards, forming a spiral channel 5. A water inlet pipe 6 is installed on the side wall of the outer tank 1. The water inlet pipe 6 is connected to the upper opening of the spiral channel 5 and extends tangentially along the spiral channel 5. Wastewater is discharged into the spiral channel 5 through the water inlet pipe 6. Flocculant can be added to the water inlet pipe 6 through a feeding device and enters the spiral channel 5 along with the wastewater. At the same time as the wastewater is discharged into the spiral channel 5, the flocculant is also discharged into the spiral channel 5 and flows downwards along the spiral channel 5, where it undergoes flocculation and sedimentation. The sediment settles at the bottom of the outer tank 1. The bottom of the outer tank 1 has a conical structure that is wider at the top and narrower at the bottom, which is conducive to the concentration of sediment.

[0028] Reference Figure 2 The spiral blade 4 has inlets 38, and multiple inlets 38 are spaced apart along the spiral direction of the spiral blade 4. A mixing plate 39 is provided on the lower side of each inlet 38 of the spiral blade 4, and the mixing plate 39 is inclined in the spiral direction. The mixing plate 39 can promote the uniform distribution of flocculant, and the flocculent precipitate can fall down from the inlet 38 during the flow of the spiral channel 5.

[0029] An overflow pipe 7 is fixed to the inner wall of the inner tank 2. The lower end of the overflow pipe 7 is connected to the outer wall of the inner tank 2, that is, a through-hole 42 is opened on the lower side wall of the inner tank 2, and the through-hole 42 is connected to the inner cavity of the overflow pipe 7. An overflow outlet 8 is opened at the upper end of the overflow pipe 7. Wastewater can flow into the inner tank 2 through the overflow pipe 7. A filter screen can also be fixed at the overflow outlet 8 to reduce the amount of flocculent entering the inner tank 2. A drain pipe 9 is installed on the inner tank 2. The drain pipe 9 is lower than the inlet pipe 6. The drain pipe 9 passes through the outer tank 1, and the water in the inner tank 2 overflows out through the drain pipe 9.

[0030] Reference Figure 2 and Figure 3 The outer tank 1 has a drain outlet 10 at its bottom, and a closing plate 11 is installed at the lower end of the outer tank 1. The closing plate 11 can open or close the drain outlet 10. The inner tank 2 has a discharge outlet 12 at its lower end, and a sealing plate 13 is installed at the lower end of the inner tank 2. Figure 4 The sealing plate 13 has a through hole 14, which can rotate to make the through hole 14 coincide with or be offset from the discharge port 12. A driving component 15 is installed on the cover 3, which can drive the opening and closing plate 11 to open the drain port 10, and then drive the sealing plate 13 to open the discharge port 12. Therefore, when the bottom sediment of the outer tank 1 is discharged, the opening and closing plate 11 is moved by the driving component 15, thereby opening the drain port 10. In a further embodiment, a liquid outlet pipe 40 is installed on the lower side wall of the outer tank 1. When draining the bottom of the outer tank 1, the upper layer of wastewater in the outer tank 1 is first discharged through the liquid outlet pipe 40, and then the sewage is discharged.

[0031] As the inner tank 2 will accumulate a certain amount of sediment at the bottom after a long period of use, the drive component 15 drives the opening and closing plate 11 to open the drain port 10, so that the drive component 15 can continue to drive the sealing plate 13 to rotate, so that the discharge port 12 and the through hole 14 coincide, and the sediment in the inner tank 2 can be discharged.

[0032] Reference Figure 3 and Figure 4 A mounting post 26 is fixed at the center of the cover 3, extending into the inner cavity of the inner tank 2. The driving component 15 includes a power shaft 151 rotatably connected to the mounting post 26, a power source 152 mounted on the surface of the cover 3 for driving the power shaft 151, a drive cylinder 153 rotatably mounted on the lower end of the mounting post 26, and a drive cylinder 154 rotatably mounted on the lower end of the drive cylinder 153. The drive cylinder 153 is rotatably connected to the mounting post 26 via bearings or the like, and the upper end of the drive cylinder 154 is rotatably connected to the lower end of the drive cylinder 153 via bearings or the like, and the drive cylinder 153 rotatably passes through the bottom surface of the inner tank 2.

[0033] The lower end of the drive cylinder 154 extends through the drain port 10, and the opening and closing plate 11 is threadedly connected to the outer wall of the drive cylinder 154. A guide member 16 is installed between the opening and closing plate 11 and the outer tank 1. The guide member 16 is a guide rod, and multiple guide rods are symmetrically arranged. The guide rods slide through the opening and closing plate 11. When the drive cylinder 154 rotates, it can drive the opening and closing plate 11 to move up and down, thereby causing the opening and closing plate 11 to close the drain port 10, or move downward to open the drain port 10.

[0034] The drive cylinder 154 and the drive cylinder 153 are hollow structures with their inner cavities connected. The lower end of the power shaft 151 extends into the drive cylinder 154. A switching element 17 is installed on the outer wall of the power shaft 151. The switching element 17 can drive the power shaft 151 and the drive cylinder 154 to cooperate, causing the power shaft 151 to rotate and drive the drive cylinder 154 to rotate, thus causing the opening and closing plate 11 to move downward. Then, through the action of the switching element 17, the power shaft 151 and the drive cylinder 153 can be rotated, thereby driving the sealing plate 13 to rotate.

[0035] Reference Figure 4 and Figure 5 A fixed seat 18 is fixed to the lower end of the drive shaft 151, and the fixed seat 18 is located inside the drive cylinder 154. The sidewalls of the fixed seat 18 are symmetrically provided with sliding grooves 28, which extend radially along the fixed seat 18. A meshing pin 19 is slidably connected in the sliding groove 28, and a first elastic element 20, which is a spring, is provided between the meshing pin 19 and the inner wall of the sliding groove 28. The sliding groove 28 has a space for installing the spring. Under the action of the first elastic element 20, the meshing pin 19 is housed in the sliding groove 28. The inner wall of the drive cylinder 154 is fixed with first teeth 21, which are evenly distributed along the circumference of the drive cylinder 154.

[0036] The fixed base 18 has a through groove 29, through which a sliding rod 22 slides. The through groove 29 and the sliding groove 28 are connected. When the sliding rod 22 passes through the through groove 29, one end of the engaging pin 19 is pressed by the sliding rod 22 and slides outward. The first elastic element 20 is compressed, and the engaging pin 19 can be inserted into the gap between the first teeth 21, thereby causing the fixed base 18 to rotate and drive the drive cylinder 154 to rotate.

[0037] Reference Figure 4 and Figure 5A connecting ring 23 is fixed to the upper end of the slide rod 22, and the connecting ring 23 and the power shaft 151 are coaxially arranged. A reset member 24 is installed on the outer wall of the slide rod 22. The reset member 24 is a spring and is sleeved on the outer wall of the slide rod 22. One end of the spring is connected to the connecting ring 23, and the other end is connected to the surface of the fixed seat 18. Engaging teeth 41 are symmetrically fixed on the outer wall of the connecting ring 23, and second teeth 25 are fixed on the inner wall of the drive cylinder 153. The second teeth 25 are evenly arranged along the circumference of the drive cylinder 153. The ends of the second teeth 25 are chamfered or pointed.

[0038] The switching component 17 is a threaded seat 171 that is threaded to the outer wall of the power shaft 151, and the mounting post 26 fixes a limit rod 27. The limit rod 27 slides through the threaded seat 171, so that the power shaft 151 rotates and the threaded seat 171 can move along the axial direction of the power shaft 151.

[0039] In the initial state, the threaded seat 171 abuts against the connecting ring 23, and the slide rod 22 slides through the fixed seat 18. At this time, the reset member 24 is in a compressed state, and the meshing column 19 protrudes from the surface of the fixed seat 18 and abuts against the first tooth 21. At this time, the rotation of the power shaft 151 can drive the drive cylinder 154 to rotate. Therefore, the movement of the opening and closing plate 11 can be controlled by the rotation of the power shaft 151. When it is necessary to drive the drive cylinder 153 to rotate, the power shaft 151 rotates, the threaded seat 171 moves away from the fixed seat 18, and the reset member 24 can drive the connecting ring 23 to move away from the fixed seat 18. The connecting ring 23 gradually approaches the second tooth 25. When the slide rod 22 and the meshing column 19 disengage, the first elastic member 20 drives the meshing column 19 to reset, and the meshing tooth 41 can begin to mesh with the second tooth 25. Therefore, the rotation of the power shaft 151 can drive the drive cylinder 153 to rotate, thereby controlling the movement of the sealing plate 13. The surface of the sealing plate 13 and the bottom surface of the inner tank 2 are in contact with each other, and there is a certain friction, which makes it difficult for the drive cylinder 153 to rotate spontaneously. Instead, it can only rotate under the drive of the power shaft 151.

[0040] In a further embodiment, a scraper 30 is fixed to the side wall of the drive cylinder 153, and the scraper 30 abuts against the inner wall of the conical portion at the bottom of the outer tank 1. When the drive cylinder 153 rotates a certain number of times, the scraper 30 can scrape off the sediment adhering to the inner wall of the outer tank 1. Furthermore, an opening 31 is provided on the overflow pipe 7, and the position of the opening 31 is lower than the position of the overflow port 8. A cover plate 32 is installed on the overflow pipe 7. When the sealing plate 13 rotates, it can drive the cover plate 32 to move up and down. When working, the cover plate 32 covers the opening 31. When the sealing plate 13 rotates, the cover plate 32 can move downward and separate from the opening 31, and the water in the inner tank 2 can flow out from the opening 31 and flow into the movement path of the scraper 30, thereby better cleaning the inner wall of the outer tank 1.

[0041] Reference Figure 3 and Figure 6 The overflow pipe 7 has a guide groove 34 on its surface, and a guide block 33 is fixed on the cover plate 32. The guide block 33 is slidably connected in the guide groove 34. The guide block 33 can be a dovetail-shaped structure. A second elastic element 35, which is a spring, is connected between the lower end of the guide block 33 and the bottom surface of the guide groove 34. An abutment post 36 is fixed to the lower end of the cover plate 32, and the abutment post 36 slides through the bottom surface of the inner tank 2. The upper surface of the sealing plate 13 has a series of positioning grooves 37, which are arranged around the circumference of the sealing plate 13. The two ends of the positioning grooves 37 are inclined. When the sealing plate 13 rotates, the abutment post 36 abuts against the upper surface of the sealing plate 13, the cover plate 32 slides upward to cover the opening 31, and the second elastic element 35 is stretched. When the sealing plate 13 continues to rotate, the abutment post 36 moves into the positioning groove 37, the cover plate 32 moves downward, and the opening 31 is opened.

[0042] The implementation principle of the flocculation sedimentation device in this application embodiment is as follows: In the initial state, the power shaft 151 cooperates with the meshing column 19 and the drive cylinder 154, thereby enabling the power shaft 151 to drive the opening and closing plate 11 to move up and down to open or close the drain outlet 10. When it is necessary to clean the inner wall of the bottom of the outer tank 1, the power shaft 151 continues to rotate, causing the meshing column 19 and the first tooth 21 to separate, and the biting tooth 41 and the second tooth 25 to mesh, driving the cylinder 153 to start rotating, so that the scraper 30 cleans the inner wall of the outer tank 1, and the sediment in the inner tank 2 can begin to be discharged through the discharge port 12 and the through hole 14.

[0043] Example 2 This embodiment discloses a pretreatment process for epichlorohydrin wastewater, including the following steps: (1) The wastewater pH is adjusted to 4-7, and then the wastewater is transported to the top of the micro-electrolysis reactor filled with iron-carbon balls for micro-electrolysis pretreatment of the epichlorohydrin wastewater. The treatment conditions are 55-65℃ for 60-80min. The micro-electrolysis reactor is an axially adiabatic fixed-bed reactor known to those skilled in the art. Iron-carbon micro-electrolysis, through the construction of micro-batteries, realizes the dechlorination pretreatment of chlorohydrin in the wastewater, reduces the toxicity of the wastewater, and helps subsequent oxidation and decomposition. (2) The wastewater treated in step (1) is transported to the Fenton reactor and 10-15 wt% ferrous chloride and oxidant (20-25 wt% hydrogen peroxide) are added. The reaction is carried out at 50-90℃. The iron ions enter the water and can catalyze the oxidant to produce strong oxidizing hydroxyl radicals, which oxidize organic matter. (3) After adjusting the pH of the wastewater treated in step (2) to neutral, the wastewater is sent to the flocculation sedimentation device in Example 1, and flocculant and coagulant aid are added at the same time. After flocculation, the flocculated sediment is discharged from the drain outlet 10 in the sedimentation device, and the flocculated wastewater is discharged from the drain pipe 9 to enter the subsequent post-treatment process.

[0044] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A flocculation and sedimentation device, characterized in that: The container includes an outer tank (1) and an inner tank (2), with a lid (3) covering the outer tank (1). A spiral blade (4) is connected between the inner wall of the outer tank (1) and the outer wall of the inner tank (2), forming a spiral channel (5). A water inlet pipe (6) is provided on the outer wall of the outer tank (1), and the water inlet pipe (6) is connected to the spiral channel (5) and extends along the tangent direction of the spiral channel (5). An overflow pipe (7) is provided on the inner wall of the inner tank (2), and the lower end of the overflow pipe (7) is connected to the lower side wall of the inner tank (2). An overflow port (8) is opened at the upper end of the overflow pipe (7). A drain pipe (9) is provided at the upper end of the inner tank (2), and the drain pipe (9) is positioned lower than the water inlet of the spiral channel (5), and the drain pipe (9) passes through the side wall of the outer tank (1). The outer tank (1) is provided with a drain port (10) at the lower end, and the outer tank (1) is provided with a gate plate (11) for opening and closing the drain port (10). The inner tank (2) is provided with a discharge port (12) at the lower end, and the inner tank (2) is provided with a sealing plate (13) for opening and closing the discharge port (12). The sealing plate (13) is provided with a through hole (14), which can overlap or be offset from the discharge port (12). The cover (3) is provided with a driving component (15), which can be linked with the gate plate (11) and the sealing plate (13). The driving component (15) can first drive the gate plate (11) to open the drain port (10), and then drive the sealing plate (13) to rotate to open the discharge port (12).

2. The flocculation and sedimentation device according to claim 1, characterized in that: The driving component (15) includes a power shaft (151) rotatably mounted on the cover (3), a power source (152) for driving the drive shaft to rotate, a drive cylinder (153) rotatably mounted in the cover (3), and a drive cylinder (154) rotatably connected to the lower end of the drive cylinder (153). The drive cylinder (153) rotatably passes through the inner tank (2) and extends into the outer tank (1). The opening and closing plate (11) is threadedly connected to the outer wall of the drive cylinder (154), and the lower end of the outer tank (1) and the opening and closing plate (11) are connected. A guide (16) is provided between them; the lower end of the power shaft (151) extends into the inner cavity of the drive cylinder (154), and a switching member (17) is provided on the outer wall of the power shaft (151). The power shaft (151) first cooperates with the drive cylinder (154) through the switching member (17) so that the power shaft (151) rotates and drives the opening and closing plate (11) to move downward. Then the switching member (17) can switch to cooperate with the drive cylinder (153) so as to drive the sealing plate (13) to rotate and open the discharge port (12).

3. The flocculation and sedimentation device according to claim 2, characterized in that: A fixed seat (18) is provided at the lower end of the power shaft (151). A meshing column (19) is slidably provided on the side wall of the fixed seat (18). The meshing column (19) extends along the circumferential direction of the fixed seat (18), and a first elastic element (20) is provided between the meshing column (19) and the fixed seat (18). A first tooth (21) is provided in the drive cylinder (154) at a position corresponding to the fixed seat (18). The first tooth (21) extends along the drive cylinder (151)... 54) The slide rod (22) is slidably arranged on the fixed base (18), and the upper end of the slide rod (22) is provided with a connecting ring (23). A reset member (24) is provided between the connecting ring (23) and the surface of the fixed base (18). The outer wall of the connecting ring (23) is provided with a biting tooth (41), and the inner wall of the driving cylinder (153) is provided with a second tooth (25). The second tooth (25) is evenly arranged around the circumference of the driving cylinder (153). When the power shaft (151) rotates, the switching member (17) can move along the axis of the power shaft (151). The switching member (17) abuts against the connecting ring (23). When the switching member (17) moves away from the drive cylinder (154), the reset member (24) drives the slide rod (22) to slide away from the fixed seat (18), and the slide rod (22) and the meshing column (19) separate, so that the first elastic member (20) drives the meshing column (19) to slide into the fixed seat (18). The switching member (17) continues to move, and the biting tooth (41) begins to mesh with the second tooth (25).

4. The flocculation and sedimentation device according to claim 3, characterized in that: The cover (3) is provided with a mounting post (26), the upper end of the drive cylinder (153) is rotatably connected to the lower end of the mounting post (26), the power shaft (151) rotates through the mounting post (26), the switching component (17) is a threaded seat (171), the threaded seat (171) is threadedly connected to the outer wall of the power shaft (151), and the mounting post (26) is provided with a limit rod (27), the limit rod (27) slides through the threaded seat (171).

5. The flocculation and sedimentation device according to claim 4, characterized in that: The fixed base (18) has a sliding groove (28) that passes through the side wall of the fixed base (18). The engagement column (19) is slidably connected to the sliding groove (28). The first elastic element (20) is connected between the sliding groove (28) and the outer wall of the engagement column (19). The fixed base (18) has a through groove (29) for the slide rod (22) to pass through. The through groove (29) and the sliding groove (28) are connected. When the slide rod (22) passes through the through groove (29), it can drive the engagement column (19) to slide outward. The first elastic element (20) provides the resetting force of the engagement column (19).

6. The flocculation and sedimentation device according to claim 5, characterized in that: The outer wall of the drive cylinder (153) is provided with a scraper (30), which abuts against the lower side wall of the outer tank (1). The side wall of the overflow pipe (7) is provided with an opening (31), and a cover plate (32) covering the opening (31) is provided on the overflow pipe (7). When the drive cylinder (153) rotates, it can intermittently drive the opening (31) to open and close.

7. The flocculation and sedimentation device according to claim 6, characterized in that: The cover plate (32) is provided with a guide block (33), and the overflow pipe (7) is provided with a guide groove (34). The guide block (33) is slidably disposed in the guide groove (34), and a second elastic element (35) is provided between the guide block (33) and the guide groove (34). The lower end of the cover plate (32) is provided with an abutment post (36), and the abutment post (36) slides through the bottom surface of the inner tank (2). The upper surface of the sealing plate (13) is provided with a positioning groove (37), and the two ends of the positioning groove (37) are inclined. When the sealing plate (13) rotates, the abutment post (36) abuts against the threaded groove, and the upper end of the cover plate (32) separates from the opening (31). The sealing plate (13) can push the abutment post (36) to slide upward as the sealing plate (13) continues to rotate.

8. The flocculation and sedimentation device according to claim 7, characterized in that: The spiral blade (4) has a water outlet (38) and multiple water outlets (38) are spaced apart along the spiral direction of the spiral blade (4). A mixing plate (39) is provided on the lower side of each water outlet (38) of the spiral blade (4), and the mixing plate (39) is inclined in the spiral direction.

9. A pretreatment process for epichlorohydrin wastewater, characterized in that: Includes the following steps: (1) The pH of the wastewater is adjusted to 4-7, and then the wastewater is transported to the top of the micro-electrolysis reactor filled with iron-carbon balls for micro-electrolysis pretreatment of the epichlorohydrin wastewater; (2) The wastewater treated in step (1) is transported to the Fenton reactor and ferrous chloride and oxidant are added. The reaction is carried out at 50-90℃. (3) After adjusting the pH of the wastewater treated in step (2) to neutral, the wastewater is sent to the flocculation sedimentation device of any one of claims 1-8, and flocculant and coagulant aid are added at the same time. After flocculation, the flocculated sediment is discharged from the drain outlet (10) in the sedimentation device, and the flocculated wastewater is discharged from the drain pipe (9).

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