A wastewater crystallization granulation multi-stage solid-liquid separation treatment device

Abstract

This invention relates to a wastewater crystallization granulation multi-stage solid-liquid separation treatment device, which includes, from top to bottom, a clear water zone, a mixing zone, an enrichment zone, and a total separation zone. The side wall of the enrichment zone is provided with a water inlet and a chemical dosing port. A first partition that can be opened and closed is provided between the enrichment zone and the mixing zone. A separator is provided between the mixing zone and the clear water zone. A second partition that can be opened and closed is provided between the enrichment zone and the total separation zone. The total separation zone includes, from the inside to the outside, a rotary separation zone, a sandwich zone, and a deep separation zone. The solids that settle down from the enrichment zone enter the total separation zone and continue to undergo solid-liquid separation from the inside to the outside.

Description

Technical Field

[0001] This invention belongs to the technical field of wastewater crystallization and softening treatment equipment, specifically relating to a multi-stage solid-liquid separation treatment device for wastewater crystallization granulation. Background Technology

[0002] In the field of industrial wastewater and domestic sewage treatment, for wastewater softened by crystallization and granulation, the Ca in the wastewater... 2+ The concentration is significantly reduced after crystallization and granulation, but small amounts of residual suspended solids and Mg often remain in the water. 2+ For other hardness ion pollutants such as magnesium ions and silicon, wastewater crystallization granulation and solid-liquid separation technology can be used to soften the crystallized wastewater. Under the action of added flocculants and coagulants, the added seed crystals induce crystallization, causing the wastewater to undergo a chemical reaction and coagulate into dense flocs. The seed crystals reduce the supersaturation of the reaction, promoting the formation of fine flocculated particles that precipitate and crystallize. Then, solid-liquid separation is performed to remove the flocs from the wastewater and discharge them, thereby removing magnesium ion hardness and reducing suspended solids in the water, achieving the purpose of hardness removal and turbidity reduction in wastewater.

[0003] Existing crystallization granulation and solid-liquid separation technologies and equipment typically have the following drawbacks:

[0004] 1. After adding flocculants and / or coagulants, mechanical agitators are generally used to mix the water evenly. However, mechanical agitation has low mixing efficiency, high energy consumption, and is prone to dead zones and co-current, resulting in poor mixing effect and incomplete flocculation reaction.

[0005] 2. In the field of wastewater treatment, conventional solid-liquid separation does not have the function of distinguishing solid particle size levels;

[0006] 3. The concentration and sedimentation of honeycomb inclined tube or inclined plate packing are slow, resulting in low solid-liquid separation efficiency. During solid-liquid separation, the precipitate and water are not completely separated, and the separated solid particles contain a large amount of water. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a multi-stage solid-liquid separation treatment device for wastewater crystallization granulation, comprising, from top to bottom, a clear water zone, a mixing zone, an enrichment zone, and a total separation zone. The side wall of the enrichment zone is provided with a water inlet and a chemical dosing port. A first partition that can be opened and closed is provided between the enrichment zone and the mixing zone. A separator is provided between the mixing zone and the clear water zone. A second partition that can be opened and closed is provided between the enrichment zone and the total separation zone.

[0008] The total separation zone consists of a rotational separation zone, a sandwich zone, and a deep separation zone from the inside out. Solids that settle from the enrichment zone enter the total separation zone and continue to undergo solid-liquid separation from the inside out.

[0009] Optionally, the lower part of the enrichment zone is provided with an inlet and a dosing port, which are used to input wastewater and flocculant and coagulant aid into the enrichment zone, respectively.

[0010] Optionally, the outer edge of the first partition is fixed to the inner wall of the processing device, and the first partition is horizontal when closed; the first partition can adopt a variety of opening and closing methods.

[0011] The upper part of the clear water zone is provided with a first overflow port, which is connected to a first drain pipe for overflowing and discharging the produced water of the clear water zone.

[0012] Optionally, the second partition is circular and includes an inner plate and an outer ring plate from the inside to the outside. The inner plate is circular and the outer ring plate is annular. The outer side of the outer ring plate is fixed to the inner wall of the processing device and is always in a horizontal closed state. When the inner plate is closed in a horizontal state, the outer edge of the inner plate contacts the inner edge of the outer ring plate.

[0013] The second partition is also provided with a central shaft and a fixing bolt. The central shaft and the fixing bolt are perpendicular to each other and both pass through the center of the second partition, extending to the inner wall of the processing device.

[0014] Optionally, the inner plate can be rotated up and down on both sides of the central axis. The fixing bolt is a telescopic rod. When the fixing bolt extends to the upper surface of the inner plate, it can prevent the inner plate from rotating, keeping the inner plate horizontal. When the fixing bolt retracts and detaches from the upper surface of the inner plate, the inner plate can be rotated, connecting the enrichment area and the rotation separation area.

[0015] Optionally, the rotating separation zone includes a rotating cylinder with a first sludge discharge port at the bottom for discharging the solids separated by the rotating cylinder. The side wall of the rotating cylinder is provided with several perforated strips, and the rotating separation zone is connected to the interlayer zone through the perforated strips. The lower part of the interlayer zone is provided with a bottom flow port for water thrown out from the rotating separation zone to be input into the deep separation zone through the interlayer zone.

[0016] A second sludge discharge port is provided at the bottom of the deep separation zone and on the side away from the bottom outlet, for discharging the solids separated in the deep separation zone.

[0017] Further optionally, the top opening of the rotating cylinder corresponds to the area of ​​the inner plate of the second partition, that is, the rotating cylinder is located directly below the inner plate;

[0018] The side wall of the rotating cylinder includes several inclined plates that are spaced apart and are evenly arranged along the circumference of the rotating cylinder. The gap between two adjacent inclined plates is a perforated strip, which is vertically arranged. The bottom of the rotating cylinder is closed and has a first mud outlet.

[0019] Optionally, the bottom of the deep separation zone is a conical slope, a filter cloth is provided above the conical slope, a vibration device and a second drain pipe are provided between the filter cloth and the conical slope, and the top of the filter cloth is sealed to the inner wall of the deep separation zone away from the interlayer zone.

[0020] The underflow outlet is located above the bottom end of the filter cloth, and the second mud outlet is located at the bottom end of the filter cloth.

[0021] Further optionally, the vibration device includes several floating vibrating balls and exciters. Several exciters are provided on the outside of the processing device corresponding to the top of the filter cloth, and are evenly arranged along the circumference of the processing device. The exciters are connected to the filter cloth and vibrate the filter cloth.

[0022] The floating vibrating balls are evenly laid between the filter cloth and the conical inclined surface. When the filter cloth vibrates, it causes the floating vibrating balls to jump up and down or vibrate.

[0023] Optionally, the upper part of the deep separation zone is provided with a suction port, which is connected to a first suction pipe. The first suction pipe is equipped with a first suction pump, and the other end of the first suction pipe is connected to a water distribution pipe. The water distribution pipe is evenly distributed on the water flow cross section of the mixing zone.

[0024] Optionally, the top of the area between the filter cloth and the conical inclined surface is connected to a second suction pipe and a second suction pump. The outlet of the second suction pump is connected to a gas-water separator. The gas outlet of the gas-water separator is connected to two gas distribution pipes in parallel through a vacuum pipe. The two gas distribution pipes are respectively located below the separator and below the mixing zone, and the water distribution pipe is located between the two gas distribution pipes. The liquid outlet of the gas-water separator is connected to a second drain pipe. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a multi-stage solid-liquid separation treatment device for wastewater crystallization and granulation.

[0026] Figure 2 This is a schematic diagram of the second partition.

[0027] Figure 3 This is a schematic diagram of the rotating cylinder.

[0028] Figure 4 This is a schematic diagram of another preferred rotating cylinder and interlayer region.

[0029] In the attached diagram, 1-Clear water zone, 2-Mixing zone, 3-Enrichment zone, 4-General separation zone, 5-Inlet, 6-Dosing port, 7-First baffle, 8-Second baffle, 9-Separator, 10-Rotating separation zone, 11-Interlayer zone, 12-Deep separation zone, 13-First drain pipe, 14-Inner plate, 15-Outer ring plate, 16-Central shaft, 17-Fixing bolt, 18-Rotating cylinder, 19-First sludge discharge port, 20-Perforated strip, 21-Bottom flow port, 22-Second sludge discharge port, 23-Inclined wall, 24-Third 25-Conical inclined surface, 26-Filter cloth, 27-Second drain pipe, 28-Fourth partition, 29-Floating vibrating ball, 30-First suction pipe, 31-First suction pump, 32-Water distribution pipe, 33-Vacuum pipe, 34-Second suction pump, 35-Air distribution pipe, 36-Second suction pipe, 37-Air-water separator, 38-First water outlet zone, 39-Second water outlet zone, 40-Water outlet, 41-Separation plate, 42-Telescopic rod, 43-Control unit, 44-Second overflow port, 45-Third sludge discharge port. Detailed Implementation

[0030] This embodiment provides a wastewater crystallization granulation multi-stage solid-liquid separation treatment device, such as... Figures 1-4 As shown, from top to bottom, it includes a clear water zone 1, a mixing zone 2, an enrichment zone 3, and a total separation zone 4. The side wall of the enrichment zone 3 is provided with an inlet 5 and a chemical dosing port 6. A first partition 7 that can be opened and closed is provided between the enrichment zone 3 and the mixing zone 2. A separator 9 is provided between the mixing zone 2 and the clear water zone 1. A second partition 8 that can be opened and closed is provided between the enrichment zone 3 and the total separation zone 4.

[0031] The total separation zone 4 includes a rotating separation zone 10, a sandwich zone 11, and a deep separation zone 12 from the inside out. The solids that settle down from the enrichment zone 3 enter the total separation zone 4 and continue to undergo solid-liquid separation from the inside out.

[0032] Optionally, the lower middle part of the enrichment zone 3 is provided with an inlet 5 and a dosing port 6, which are used to input wastewater and flocculant and coagulant aid into the enrichment zone 3, respectively.

[0033] Optionally, the outer edge of the first partition 7 is fixed to the inner wall of the processing device, and the first partition 7 is horizontal after being closed; the first partition 7 can adopt a variety of opening and closing methods. For example, the first partition 7 includes several rotatable cover plates. When the cover plates are rotated to the vertical state, the mixing zone 2 is connected to the enrichment zone 3. When the cover plates are rotated to the horizontal state, the mixing zone 2 is separated from the enrichment zone 3.

[0034] The separator 9 is a conventional honeycomb inclined tube or inclined plate packing, and its installation method is also conventional.

[0035] The upper part of the clear water zone 1 is provided with a first overflow port, which is connected to a first drain pipe 13 for overflowing and discharging the produced water of the clear water zone 1.

[0036] The wastewater to be treated enters the enrichment zone 3 through the inlet 5 and the flocculant is introduced through the dosing port 6. After mixing, the wastewater reacts in the enrichment zone 3 to form crystals, which grow larger. Larger crystals accumulate and deposit in the enrichment zone 3 and settle to the total separation zone 4 through the second baffle 8. The water in the enrichment zone 3 carries smaller crystals up through the first baffle 7 into the mixing zone 2, where the crystals continue to grow. After reaching a certain size, the crystals settle to the upper surface of the first baffle 7. When the first baffle 7 is opened, the larger crystals fall into the enrichment zone 3 and then settle to the total separation zone 4 through the second baffle 8. The water in the mixing zone 2 passes through the separator 9 for further solid-liquid separation. The resulting clear water flows upward into the clear water zone 1 and is then discharged from the treatment device. The separated solids fall into the mixing zone 2 and continue to grow and settle.

[0037] Optionally, the second partition 8 is circular and includes an inner plate 14 and an outer ring plate 15 from the inside to the outside. The inner plate 14 is circular and the outer ring plate 15 is annular. The outer side of the outer ring plate 15 is fixed to the inner wall of the processing device and is always in a horizontal closed state. When the inner plate 14 is closed in a horizontal state, the outer edge of the inner plate 14 contacts the inner edge of the outer ring plate 15.

[0038] The second partition 8 is also provided with a central shaft 16 and a fixing bolt 17. The central shaft 16 and the fixing bolt 17 are perpendicular to each other and both pass through the center of the second partition 8 and extend to the inner wall of the processing device.

[0039] Optionally, the inner plate 14 can be rotated up and down on both sides of the central axis 16. The fixing bolt 17 is a telescopic rod. When the fixing bolt 17 extends to the upper surface of the inner plate 14, since the fixing bolt 17 is perpendicular to the central axis 16, the fixing bolt 17 can prevent the inner plate 14 from rotating, so that the inner plate 14 remains horizontal (i.e., closed). When the fixing bolt 17 retracts and detaches from the upper surface of the inner plate 14, the inner plate 14 can be rotated, connecting the enrichment zone 3 and the rotation separation zone 10, so that the large crystal particles in the enrichment zone 3 fall into the rotation separation zone 10.

[0040] Preferably, the upper surface of the outer ring plate 15 has a slope, so that the outer ring plate 15 is inclined toward the inner plate 14. Since the outer ring plate 15 is always kept in a horizontal closed state, the solids that settle and accumulate on the outer ring plate 15 can move along the slope and with the help of water flow to the inner plate 14 area, and then enter the total separation zone 4.

[0041] Optionally, the rotating separation zone 10 includes a rotating cylinder 18, the bottom of which is provided with a first mud discharge port 19 for discharging the solids separated by the rotating cylinder 18. The side wall of the rotating cylinder 18 is provided with several perforated strips 20, and the rotating separation zone 10 is connected to the interlayer zone 11 through the perforated strips 20. The lower part of the interlayer zone 11 is provided with a bottom flow port 21 for water thrown out from the rotating separation zone 10 to be input into the deep separation zone 12 through the interlayer zone 11.

[0042] A second mud discharge port 22 is provided at the bottom of the deep separation zone 12 and on the side away from the bottom outlet 21 for discharging the solids separated by the deep separation zone 12.

[0043] Further optionally, the top opening of the rotating cylinder 18 corresponds to the area of ​​the inner plate 14 of the second partition 8, that is, the rotating cylinder 18 is located directly below the inner plate 14.

[0044] The side wall of the rotating cylinder 18 includes a number of inclined plate walls 23 spaced apart. The inclined plate walls 23 are evenly arranged along the circumference of the rotating cylinder 18. The gap between two adjacent inclined plate walls 23 is a hollow strip 20. The hollow strip 20 is vertically arranged. That is, the inclined plate walls 23 and the hollow strip 20 are arranged repeatedly to form the side wall of the rotating cylinder 18. The bottom of the rotating cylinder 18 is closed and is provided with a first row of mud openings 19.

[0045] Alternatively, the rotating cylinder 18 is connected to a drive motor located below the processing device to drive the rotating cylinder 18 to rotate.

[0046] Several inclined plates 23 are sequentially arranged in a clockwise or counterclockwise direction, with each subsequent inclined plate 23 stacked on top of the adjacent preceding inclined plate 23 at an angle of 0-45°, and arranged sequentially in a clockwise or counterclockwise direction. When the solid crystals accumulated on the second partition 8 reach a certain amount, or after a certain running time, the fixing bolt 17 contracts. The solid distribution on the inner plate 14 is mostly uneven in weight. At the same time, under the action of the water flow in the enrichment zone 3, the inner plate 14 automatically rotates around the central axis 16, causing the solid crystals and some water to fall into the rotating drum 18. The rotating drum 18 rotates, acting similarly to the spin-drying drum of a washing machine. Under the action of centrifugal force, the water in the rotating drum 18 is preferentially thrown out through the perforated strips 20 and enters the interlayer zone 11. Most of the solid crystals remain in the rotating drum 18 and are then discharged through the first mud outlet 19.

[0047] Optionally, the interlayer zone 11 and the deep separation zone 12 are provided with a third baffle 24. The third baffle 24 is cylindrical and is arranged around the periphery of the rotating separation zone 10. The top of the third baffle 24 is connected to the lower surface of the outer ring plate 15, and the bottom of the third baffle 24, except for the bottom flow port 21, is connected to the bottom surface of the treatment device. The third baffle 24 effectively intercepts water and fine particles thrown out from the rotating cylinder 18, thereby changing the flow direction of the water from a roughly horizontal direction to a vertical downward direction.

[0048] Optionally, the bottom of the deep separation zone 12 is a conical slope 25, and a filter cloth 26 is provided above the conical slope 25. A vibration device and a second drain pipe 27 are provided between the filter cloth 26 and the conical slope 25. The top of the filter cloth 26 is sealed to the inner wall of the deep separation zone 12 away from the interlayer zone 11. The angle between the conical slope 25 and the horizontal direction is 45-60°.

[0049] The bottom outlet 21 is located above the bottom end of the filter cloth 26. Water from the interlayer zone 11 enters the deep separation zone 12 through the bottom outlet 21 and is then filtered through the filter cloth 26. The filtered water is discharged through the second drain pipe 27.

[0050] The second mud outlet 22 is located at the bottom end of the filter cloth 26. The second mud outlet 22 and the bottom flow outlet 21 are located on both sides of the third baffle 24, to prevent the water that has just entered the deep separation zone 12 from being discharged through the second mud outlet 22.

[0051] The second drain pipe 27 is connected in parallel with the first drain pipe 13 and then connected to the main water production pipe.

[0052] Further optionally, the conical inclined surface 25 is inclined downward from the side of the processing device towards the center, the filter cloth 26 is parallel to the conical inclined surface 25, and the bottom end of the filter cloth 26, except for the second mud outlet 22, is connected to the bottom or near the bottom of the third partition plate 24.

[0053] A fourth partition 28 is connected between the second mud outlet 22 and the bottom of the corresponding filter cloth 26. This partition is used to isolate the space above and below the filter cloth 26 at the second mud outlet 22, preventing the filtrate below the filter cloth 26 from being discharged from the second mud outlet 22.

[0054] Further optionally, the vibration device includes a plurality of floating vibrating balls 29 and exciters. A plurality of exciters are provided on the outer side of the processing device corresponding to the top of the filter cloth 26 and are evenly arranged along the circumference of the processing device. The exciters are connected to the filter cloth 26 and vibrate the filter cloth 26.

[0055] The floating vibrating balls 29 are evenly laid between the filter cloth 26 and the conical inclined surface 25. When the filter cloth 26 vibrates, it drives the floating vibrating balls 29 to jump up and down or vibrate, so that the floating vibrating balls 29 irregularly impact the filter cloth 26 in turn, promoting the solid particles deposited on the filter cloth 26 to fall off and then be discharged from the second mud outlet 22.

[0056] The floating vibrating ball 29 is made of perlite and has a microporous structure.

[0057] Optionally, the upper part of the deep separation zone 12 is provided with a suction port, which is connected to a first suction pipe 30. The first suction pipe 30 is provided with a first suction pump 31, and the other end of the first suction pipe 30 is connected to a water distribution pipe 32. The water distribution pipe 32 is evenly distributed on the water flow cross section of the mixing zone 2 to input fine solid particles in the deep separation zone 12 into the mixing zone 2 as seed crystals to promote the crystal growth of the mixing zone 2.

[0058] Optionally, the top of the area between the filter cloth 26 and the conical inclined surface 25 is connected to a second suction pipe 26 and a second suction pump 34. The outlet of the second suction pump 34 is connected to a gas-liquid separator 37. The gas outlet of the gas-liquid separator 37 is connected in parallel to two gas distribution pipes 35 through a vacuum pipe 33. The two gas distribution pipes 35 are respectively located below the separator 9 and the lower part of the mixing zone 2, and the water distribution pipe 32 is located between the two gas distribution pipes 35. The liquid outlet of the gas-liquid separator 37 is connected to a second drain pipe 27.

[0059] The second suction pump 34 promotes the vibration or movement of the floating vibrating ball 29, which in turn promotes the filtration of the filter cloth 26 and improves the filtration efficiency. The air distribution pipe 35 located below the separator 9 aerates upwards, impacting and cleaning the honeycomb inclined tube or inclined plate packing. The air distribution pipe 35 located below the water distribution pipe 32 aerates upwards and downwards, promoting mass transfer and crystal growth in the mixing zone 2 and improving the mixing efficiency.

[0060] Water and fine particles enter the deep separation zone 12 for further treatment. In the deep separation zone 12, they settle, and large solid particles are further separated by the action of the bottom inclined filter cloth 26, collecting at the bottom of the deep separation zone 12 and then discharged through the second sludge outlet 22. The vacuum tube 33 creates a vacuum environment between the filter cloth 26 and the conical inclined surface 25, which improves the efficiency of deep separation. The vacuum gas flushes the separator 9 through the gas distribution pipe 35, preventing blockage of the packing holes; simultaneously, it increases the pneumatic mixing effect in the mixing zone 2, increasing the dissolved oxygen content of the water in the mixing zone 2, which is beneficial for wastewater nitrification and denitrification biological treatment, providing a favorable environment for subsequent biological treatment. This achieves comprehensive utilization and green, low-carbon treatment of the waste gas after vacuuming.

[0061] This invention achieves preliminary solid-liquid separation in the enrichment zone 3 through sedimentation; secondary solid-liquid separation is performed in the rotating separation zone 10 through rotation and the perforated strips 20 on the sidewalls; tertiary solid-liquid separation is achieved in the deep separation zone 12 through the filter cloth 26 and vacuum action; the water containing fine solid particles in the upper part of the deep treatment zone is returned to the mixing zone 2 for regranulation and reseparation, achieving quaternary solid-liquid separation. Furthermore, it enables the classification, separation, collection, and treatment of solid particles of different sizes at the bottom of the rotating separation zone 10 and the bottom of the deep treatment zone. Specifically, the average particle size of the solids discharged from the first and second sludge discharge ports differs, with the first discharge port discharging larger particles, thus achieving particle size classification. Through multi-stage solid-liquid separation, deep treatment of solid particles and the separated water is achieved, improving the efficiency of solid-liquid separation.

[0062] In order to further improve the separation efficiency and effluent rate of the rotary separation zone 10, the interlayer zone 11 and the deep separation zone 12, while reducing the water content of the sludge discharged from the first sludge discharge port 19, the present invention also provides the following preferred solutions.

[0063] Optionally, the rotating cylinder 18 includes a first water outlet area 38 and a second water outlet area 39. The second water outlet area 39 is located at the bottom of the rotating cylinder 18 and below the first water outlet area 38. The ratio of the height of the second water outlet area 39 to the height of the rotating cylinder 18 is 1:(5-7).

[0064] The sidewall of the first water outlet zone 38 is provided with the aforementioned perforated strip 20 and inclined plate wall 23; the second water outlet zone 39 is provided with a water outlet 40, which surrounds the second water outlet zone 39 and is provided with a switch gate; the surface of the water outlet 40 is provided with a filter screen for intercepting sludge.

[0065] Optionally, the inclined plate wall 23 of the first water outlet zone 38 is openable and closable. A vertical central pivot passes through the center of the inclined plate wall 23, and the upper and lower ends of the central pivot are rotatably connected to the top and bottom of the first water outlet zone 38. The rotation of the central pivot drives the inclined plate wall 23 to rotate, thereby opening and closing the side wall of the first water outlet zone 38. When both sides of all the inclined plate walls are in contact with the sides of the adjacent inclined plate walls, the side wall of the first water outlet zone 38 can be closed.

[0066] Optionally, the lower surface of the inner plate 14 is provided with a drainage device, which includes a separation plate 41, a telescopic rod 42 and a control part 43. The control part 43 is located at the center of the lower surface of the inner plate 14. The control part 43 is connected to the top end of the telescopic rod 42, and the bottom end of the telescopic rod 42 is connected to the separation plate 41. The surface of the separation plate 41 is evenly covered with through holes.

[0067] Optionally, the top of the interlayer zone 11 is provided with a second overflow port 44, which is arranged around the circumference of the interlayer zone 11 to discharge the water in the interlayer zone 11 into the deep separation zone 12; the lower part of the interlayer zone 11 is not provided with a bottom outlet 21.

[0068] The bottom of the interlayer zone 11 is provided with a third sludge discharge port 45 for discharging sludge from the interlayer zone 11.

[0069] As described above, when the inner plate 14 flips and the solid crystals and water in the enrichment zone 3 are poured into the rotating cylinder 18, the inner plate 14 is then closed horizontally, and the drainage device faces the rotating separation zone 10, isolating the enrichment zone 3 from the rotating separation zone 10. The inclined wall 23 of the rotating cylinder 18 opens, exposing the perforated strip 20, and the outlet 40 closes. Simultaneously, the cylinder rotates, and the water in the rotating cylinder 18 is first thrown out under centrifugal force and intercepted by the third baffle 24, thus falling into the interlayer zone 11. After overflowing through the interlayer zone 11, it flows to the deep separation zone 12. During this process, some sludge also accumulates in the interlayer zone 11 and at the bottom of the rotating cylinder 18. The outlet 40 prevents sludge from entering the interlayer zone 11. The water in the rotating cylinder 18 is not completely full, leaving a waterless space for the control unit 43. The sludge at the bottom of the interlayer zone 11 is discharged through the third sludge discharge port 45.

[0070] When the water level in the rotating drum 18 is low or a large amount of sludge is ejected, rotation stops, the inclined plate wall 23 of the first outlet zone 38 closes, and the control unit 43 controls the extension rod 42 to extend, pushing the separation plate 41 downward and gradually compressing the water in the rotating drum 18. The sludge is pressed under the separation plate 41, and the water passes through the through holes of the separation plate 41, undergoing forced filtration. When the separation plate 41 enters the second outlet zone 39, the inclined plate wall 23 of the first outlet zone 38 reopens, allowing the water above the separation plate 41 (i.e., the filtered water) to be discharged into the interlayer zone 11 through the perforated strip 20, overflowing again into the deep separation zone 12. The separation plate 41 continues to be pushed downward, the gate of the outlet 40 opens, and the water in the second outlet zone 39 is discharged from the interlayer zone 11 through the outlet 40. Thus, the water in the rotating drum 18 can be discharged to the maximum extent, and the water content of the sludge discharged from the first sludge discharge port 19 and the third sludge discharge port 45 can be reduced.

Claims

1. A wastewater crystallization granulation multi-stage solid-liquid separation treatment device, characterized in that, From top to bottom, it includes a clear water zone, a mixing zone, an enrichment zone, and a total separation zone. The side wall of the enrichment zone is equipped with an inlet and a chemical dosing port. There is an openable first partition between the enrichment zone and the mixing zone. There is a separator between the mixing zone and the clear water zone. There is an openable second partition between the enrichment zone and the total separation zone. The total separation zone consists of a rotating separation zone, a sandwich zone, and a deep separation zone from the inside out. Solids that settle down from the enrichment zone enter the total separation zone and continue to undergo solid-liquid separation from the inside out. The bottom of the deep separation zone is a conical slope, and a filter cloth is provided above the conical slope. A vibration device and a second drain pipe are provided between the filter cloth and the conical slope. The vibration device includes several floating vibrating balls and exciters. Several exciters are provided on the outside of the processing device at the position corresponding to the top of the filter cloth. The exciters are connected to the filter cloth and vibrate the filter cloth. The floating vibrating balls are evenly laid between the filter cloth and the conical inclined surface. When the filter cloth vibrates, it causes the floating vibrating balls to jump up and down or vibrate. The upper part of the deep separation zone is provided with a suction port, which is connected to a first suction pipe. A first suction pump is provided on the first suction pipe, and the other end of the first suction pipe is connected to a water distribution pipe. The water distribution pipe is evenly distributed on the water flow cross section of the mixing zone. The top of the area between the filter cloth and the conical inclined surface is connected to a second suction pipe and a second suction pump. The outlet of the second suction pump is connected to a gas-liquid separator. The gas outlet of the gas-liquid separator is connected to two gas distribution pipes in parallel through a vacuum pipe. The two gas distribution pipes are respectively located below the separator and below the mixing zone, and the water distribution pipe is located between the two gas distribution pipes. The liquid outlet of the gas-liquid separator is connected to a second drain pipe.

2. The wastewater crystallization granulation multi-stage solid-liquid separation treatment device according to claim 1, characterized in that, The second partition is circular and includes an inner plate and an outer ring plate from the inside out. The inner plate is circular and the outer ring plate is annular. The outer side of the outer ring plate is fixed to the inner wall of the processing device and is always in a horizontal closed state. When the inner plate is closed in a horizontal state, the outer edge of the inner plate contacts the inner edge of the outer ring plate. The second partition is also provided with a central shaft and a fixing bolt. The central shaft and the fixing bolt are perpendicular to each other and both pass through the center of the second partition, extending to the inner wall of the processing device.

3. The wastewater crystallization granulation multi-stage solid-liquid separation treatment device according to claim 2, characterized in that, The inner plate can be rotated up and down on both sides of the central axis. The fixing bolt is a telescopic rod. When the fixing bolt extends to the upper surface of the inner plate, it can prevent the inner plate from flipping, keeping the inner plate horizontal. When the fixing bolt retracts and detaches from the upper surface of the inner plate, the inner plate can flip, connecting the enrichment area and the rotation separation area.

4. The wastewater crystallization granulation multi-stage solid-liquid separation treatment device according to claim 2, characterized in that, The rotary separation zone includes a rotary cylinder with a first sludge discharge port at the bottom for discharging the solids separated by the rotary cylinder. The side wall of the rotary cylinder is provided with several perforated strips, and the rotary separation zone is connected to the interlayer zone through the perforated strips. The lower part of the interlayer zone is provided with a bottom flow port for water thrown out from the rotary separation zone to be input into the deep separation zone through the interlayer zone. A second sludge discharge port is provided at the bottom of the deep separation zone and on the side away from the bottom outlet, for discharging the solids separated in the deep separation zone.

5. The wastewater crystallization granulation multi-stage solid-liquid separation treatment device according to claim 4, characterized in that, The top opening of the rotating cylinder corresponds to the area of ​​the inner plate of the second partition, and the rotating cylinder is located directly below the inner plate. The side wall of the rotating cylinder includes several inclined plates that are spaced apart and are evenly arranged along the circumference of the rotating cylinder. The gap between two adjacent inclined plates is a perforated strip, which is vertically arranged. The bottom of the rotating cylinder is closed and has a first mud outlet.

6. The wastewater crystallization granulation multi-stage solid-liquid separation treatment device according to claim 4, characterized in that, The top of the filter cloth is sealed to the inner wall of the deep separation zone on the side away from the interlayer zone; the bottom outlet is located above the bottom of the filter cloth, and the second mud outlet is located at the bottom of the filter cloth.

7. The wastewater crystallization granulation multi-stage solid-liquid separation treatment device according to claim 1, characterized in that, The lower part of the enrichment zone is equipped with a water inlet and a chemical dosing port; The outer edge of the first partition is fixed to the inner wall of the treatment device, and the first partition is horizontal after being closed; the upper part of the clear water zone is provided with a first overflow port, which is connected to a first drain pipe for overflowing and discharging the produced water of the clear water zone.

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