A zero-discharge treatment device and method for concentrated wastewater from a power plant

Abstract

This invention belongs to the field of concentrated wastewater discharge treatment, specifically a zero-discharge treatment device and method for concentrated wastewater from power plants. It includes a reaction tank, a stirring rod fixed at the bottom of the reaction tank, a stirring rod rotatably connected to the middle of the reaction tank, and a filtration and adjustment mechanism for separating precipitates generated from the wastewater. The filtration and adjustment mechanism includes a shell threaded to the bottom of the outer circumference of the discharge pipe, a filter screen fixed in the inner cavity of the shell, a filter disc assembly for separating heavy metal precipitates, and an anti-clogging component acting on the filter disc assembly. This invention connects the second filter hole to two adjacent first filter holes and, during filtration, causes the movable disc to drive the insertion rod to reciprocate vertically. This prevents lumpy heavy metal precipitates from clogging the first and second filter holes during filtration, thus ensuring effective separation of the wastewater and precipitates after sedimentation.

Description

Technical Field

[0001] This invention belongs to the field of concentrated wastewater discharge treatment, specifically a zero-discharge treatment device and method for concentrated wastewater from power plants. Background Technology

[0002] The zero-discharge treatment method for concentrated wastewater from power plants mainly includes three steps: pretreatment, concentration treatment, and evaporation and crystallization. The pretreatment stage mainly removes suspended solids, hardness, alkalinity, heavy metals, etc. from the wastewater to meet the influent requirements of subsequent systems and avoid scaling and clogging in the subsequent treatment systems.

[0003] In existing technologies, power plant wastewater pretreatment devices promote the sedimentation of suspended solids by adding coagulants, followed by solid-liquid separation. During the solid-liquid separation process, the internal filter plates are mostly used for filtration. However, because flocculent suspended solids and lumpy heavy metal precipitates are prone to coexist during the pretreatment process, the filter plates are easily clogged, which is not conducive to the pretreatment of wastewater.

[0004] Therefore, the present invention provides a zero-discharge treatment device and method for concentrated wastewater from power plants. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0006] The technical solution adopted by the present invention to solve its technical problem is: the power plant concentrated wastewater zero discharge treatment device of the present invention includes a reaction tank, a discharge pipe connected and fixed at the bottom of the reaction tank, a stirring rod rotatably connected at the middle of the reaction tank, and a filter adjustment mechanism for separating the precipitates generated by the wastewater.

[0007] The filtration adjustment mechanism includes a housing threaded to the bottom of the outer circumference of the discharge pipe, a filter screen fixed at the position of the inner cavity of the housing, a filter disc assembly for separating heavy metal precipitates, an anti-clogging component acting on the filter disc assembly, and a drive component acting on the stirring rod and the anti-clogging component.

[0008] The filter plate assembly includes an outer shell fixed at the middle position of the inner cavity of the reaction tank, a rotating disk rotatably connected at the middle position of the inner cavity of the outer shell, first filter holes evenly opened on the upper and lower end surfaces of the outer shell, second filter holes evenly opened through the surface of the rotating disk, an annular groove opened in the inner cavity of the outer shell near the outer peripheral surface of the rotating disk, a limiting ring fixed to the outer peripheral surface of the rotating disk, and a rotating component for driving the rotating disk to rotate.

[0009] The anti-clogging component includes a movable disc located at the bottom of the outer shell, a rod evenly fixed at the top of the movable disc, a rotating shaft rotatably connected to the inner cavity of the reaction vessel located at the bottom of the movable disc, a cam fixedly sleeved on the outer circumference of the rotating shaft, and a first spring telescopic rod fixed at both ends of the bottom of the movable disc.

[0010] Preferably, the inner cavities of the first filter hole and the adjacent second filter hole are connected, the limiting ring and the ring groove are slidably connected, the surface of one end of the cam abuts against the surface of the bottom of the movable disk, the bottom of the first spring telescopic rod is fixed to the inner cavity surface of the reaction barrel, and one side of the rotating shaft passes through the reaction barrel and extends out of the outside of the reaction barrel.

[0011] Preferably, the drive assembly includes a motor fixed to one side of the top of the reaction vessel, a movable rod rotatably connected to the other side of the top of the reaction vessel, a rotating rod rotatably connected to one side of the outer circumferential surface of the reaction vessel, a first bevel gear fixedly sleeved at the external position of the extension of the stirring rod outside the reaction vessel, a second bevel gear fixedly sleeved on one side of the outer circumferential surface of the motor and the outer circumferential surface of the movable rod, an insertion component for connecting the rotating rod and the rotating shaft, a pulley fixedly sleeved on the other side of the outer circumferential surface of the movable rod, and a connecting belt disposed between the two pulleys, wherein the first bevel gear and the two second bevel gears are meshed together.

[0012] Preferably, the rotating component includes a second rotating rod inserted through the middle of the stirring rod, a deflector plate fixed to the outer circumference of the second rotating rod, a fixed seat in an L-shape fixed at one end of the top of the reaction tank, and positioning posts on both sides of the deflector plate. The bottom of the positioning posts is fixed to the surface of the fixed seat, and the bottom of the second rotating rod is fixed to the middle of the top surface of the rotating disk.

[0013] Preferably, the insertion component includes an inner groove formed on one side surface of the rotating rod, an abutment groove formed at the external position of the reaction tank at the extension of the rotating shaft, a first threaded rod threadedly connected to the middle position of the rotating rod, a movable block rotatably connected to one side of the first threaded rod, a connecting shaft slidably inserted into the inner cavity of one end of the side surface of the movable block, a damper fixed to the inner cavity of the other end of the side surface of the movable block, and a connecting spring fixed to one side surface of the connecting shaft. One side of the connecting spring is fixed to one inner cavity of the movable block, one side of the damper is fixed to the surface of the insertion block, and the surface of the movable block is in contact with the inner cavity of the inner groove.

[0014] Preferably, it further includes a cleaning mechanism for cleaning the inner circumferential surface of the reaction vessel and the outer surface of the outer shell. The cleaning mechanism includes a sleeve fixedly sleeved on the outer circumferential surface of the stirring rod at the position of the inner cavity of the reaction vessel, first brush plates symmetrically arranged on both sides of the bottom of the sleeve, a shaft seat fixed on one side close to each other of the two first brush plates, a second brush plate arranged at the bottom position of the stirring rod, a displacement component acting on the shaft seat, and an abutment component acting on the second brush plate.

[0015] Preferably, the displacement assembly includes a second threaded rod rotatably connected to both sides of the inner cavity surface of the sleeve, a threaded sleeve threadedly connected to the outer circumferential surface of the second threaded rod at a position within the inner cavity of the sleeve, a first rotating rod rotatably connected to a position within the inner cavity of the stirring rod, a third bevel gear fixedly sleeved on the outer circumferential surface of the first rotating rod, and a fourth bevel gear fixedly sleeved on the outer circumferential surface of the second threaded rod at a position within the inner cavity of the stirring rod. The third bevel gear and the fourth bevel gear are meshed together. The inner cavity of the sleeve is rotatably connected to the inner cavity surface of the stirring rod. One end of the first rotating rod passes through the stirring rod and extends to the outside of the stirring rod. The first rotating rod and the second rotating rod are connected by a through-insertion connection. The inner cavity surface of the sleeve is in contact with the surface of the threaded sleeve. The top of the shaft seat is fixed to the surface of the threaded sleeve at an adjacent position. The first rotating rod is rotatably connected to the fixed seat.

[0016] Preferably, the abutment assembly includes a movable plate that is slidably inserted through the stirring rod at the bottom position of the second brush plate, a second spring telescopic rod fixed to the surface of the stirring rod at the top position of the movable plate, and an abutment plate disposed at one end of the second brush plate. One side of the abutment plate is fixed to the surface of the adjacent first brush plate, and one end of the first brush plate is fixed to the surface of the abutment plate.

[0017] A method for zero-discharge treatment of concentrated wastewater from power plants, comprising the aforementioned zero-discharge treatment device for concentrated wastewater from power plants, includes the following steps:

[0018] S1: The power plant wastewater is transported to the inner cavity of the reaction tank and coagulant is added inside. The motor is started to make the stirring rod rotate to promote the full mixing and reaction of the wastewater and coagulant. After a period of time, precipitates will be produced in the wastewater by the reaction, and the motor will be turned off.

[0019] S2: The toggle plate drives the second rotating rod to rotate so that the first filter hole and the second filter hole are opposite each other. After rotating the first threaded rod so that the insert block is embedded in the contact groove, the motor is started again so that the insert rod can go back and forth between the first filter hole and the second filter hole to perform filtration.

[0020] S3: After filtration is complete, turn off the motor, remove the casing and seal the discharge pipe, add cleaning liquid to the inside of the discharge pipe, and then rotate the first rotating rod to make the first brush plate adhere to the inner circumference of the reaction barrel and the second brush plate adhere to the surface of the outer shell. Then start the motor again to perform friction cleaning on the inner circumference of the reaction barrel and the surface of the outer shell.

[0021] S4: After cleaning is completed, unseal the discharge pipe, reinstall the casing, and rotate the first threaded rod to disengage the insert from the inside of the contact groove. Then, rotate the first rotating rod to separate the first brush plate, the second brush plate, and the inner circumferential surface of the reaction vessel from the surface of the outer casing. Finally, rotate the second rotating rod to rotate the rotating disk to seal the outer casing, ready for the drainage to enter in the next stage.

[0022] The beneficial effects of this invention are as follows:

[0023] 1. This invention, when filtration is required, first rotates the second rotating rod to make the rotating disk rotate, connecting the second filter hole with two adjacent first filter holes. During filtration, the movable disk drives the insertion rod to reciprocate in the vertical direction. This prevents blocky heavy metal precipitates from clogging the first and second filter holes during filtration, thus ensuring the separation effect of the wastewater after sedimentation and the precipitate, thereby improving the working efficiency of the wastewater pretreatment process.

[0024] 2. When cleaning the inner cavity of the reaction tank and the inner wall of the top of the outer shell is required, the present invention rotates the first rotating rod so that the first brush plate can adhere to the inner circumferential surface of the reaction tank and the second brush plate can adhere to the surface of the outer shell. Under the drive of the stirring rod, the inner circumferential surface of the reaction tank and the surface of the outer shell are frictionally cleaned, thereby causing the flocculent precipitate adhering to the inner cavity of the reaction tank at the top of the outer shell to detach from the inside of the reaction tank and the surface of the outer shell, so as to be discharged outside the reaction tank. This prevents excessive flocculent precipitate adhering to the inner wall of the reaction tank from affecting the drainage and coagulant mixing process. In addition, the first and second brush plates can be reset during the stirring process to reduce the impact of the stirring process on the stirring rod, thereby improving the applicability of the device. Attached Figure Description

[0025] The invention will now be further described with reference to the accompanying drawings.

[0026] Figure 1 This is a three-dimensional structural diagram of the present invention viewed from the front.

[0027] Figure 2 This is a three-dimensional cross-sectional view of the present invention from the frontal view.

[0028] Figure 3 In this invention Figure 2Enlarged structural diagram at point A;

[0029] Figure 4 In this invention Figure 2 Enlarged structural diagram at point B;

[0030] Figure 5 This is a three-dimensional cross-sectional view of the stirring rod in this invention;

[0031] Figure 6 In this invention Figure 5 Enlarged structural diagram at point C;

[0032] Figure 7 In this invention Figure 5 Enlarged structural diagram at point D;

[0033] Figure 8 This is a three-dimensional cross-sectional view of the outer shell in this invention;

[0034] Figure 9 This is a three-dimensional cross-sectional view of a local structure in this invention;

[0035] Figure 10 This is a flowchart illustrating the usage method of the power plant concentrated wastewater zero-discharge treatment device in this invention.

[0036] In the diagram: 1. Reaction tank; 2. Discharge pipe; 3. Stirring rod; 4. Motor; 5. Outer shell; 6. Rotating disc; 7. First filter hole; 8. Second filter hole; 9. Annular groove; 10. Limiting ring; 11. Movable disc; 12. Insert rod; 13. Rotating shaft; 14. Cam; 15. First spring telescopic rod; 16. Sleeve; 17. Filter screen; 18. Rotating rod; 19. Movable rod; 20. First bevel gear; 21. Second bevel gear; 22. Pulley; 23. Connecting belt; 24. First threaded rod; 25. 26. Inner groove; 27. Movable block; 28. Insert block; 29. ​​Abutment groove; 30. Connecting spring; 31. Connecting shaft; 32. Damper; 33. Fixed seat; 34. First rotating rod; 35. Second rotating rod; 36. Sleeve seat; 37. Second threaded rod; 38. Third bevel gear; 39. Fourth bevel gear; 40. Threaded sleeve; 41. Shaft seat; 42. First brush plate; 43. Second brush plate; 44. Movable plate; 45. Second spring telescopic rod; 46. Abutment plate; 47. Toggle plate; 48. Positioning post. Detailed Implementation

[0037] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0038] Example 1:

[0039] like Figures 1 to 9As shown, an embodiment of the present invention provides a zero-discharge treatment device for concentrated wastewater from a power plant, comprising a reaction tank 1, a stirring rod 3 fixed at the bottom of the reaction tank 1, a stirring rod 3 rotatably connected to the middle of the reaction tank 1, and a filter adjustment mechanism for separating precipitates generated from the wastewater.

[0040] The filtration adjustment mechanism includes a housing 16 threaded to the bottom of the outer periphery of the discharge pipe 2, a filter screen 17 fixed in the inner cavity of the housing 16, a filter disc assembly for separating heavy metal precipitates, an anti-clogging component acting on the filter disc assembly, and a drive component acting on the stirring rod 3 and the anti-clogging component.

[0041] By adding coagulant to the inside of the reaction tank 1 and draining the water, the rotation of the stirring rod 3 promotes the mixing reaction between the two to facilitate the sedimentation of suspended solids. The filter plate assembly can filter the metal precipitates contained in the drainage after the reaction. The anti-clogging component can prevent the filter plate assembly from clogging when filtering metal precipitates. The filter screen 17 can filter the flocculent precipitates contained in the drainage. Due to the connection between the outer shell 16 and the discharge pipe 2, it can be replaced regularly to prevent affecting the filtration of flocculent precipitates. The drive component can drive the rotation of the stirring rod 3 and the operation of the anti-clogging component. The sealing door set on the surface of the reaction tank 1 can be opened to clean the metal precipitates accumulated on the top surface of the outer shell 5.

[0042] Please refer to Figure 1-9 As shown, the filter plate assembly includes an outer shell 5 fixed at the middle position of the inner cavity of the reaction tank 1, a rotating disk 6 rotatably connected at the middle position of the inner cavity of the outer shell 5, first filter holes 7 evenly opened on the upper and lower end surfaces of the outer shell 5, second filter holes 8 evenly opened through the surface of the rotating disk 6, an annular groove 9 opened in the inner cavity of the outer shell 5 near the outer peripheral surface of the rotating disk 6, a limiting ring 10 fixed to the outer peripheral surface of the rotating disk 6, and a rotating component for driving the rotating disk 6 to rotate. The inner cavities of the first filter hole 7 and the adjacent second filter hole 8 are connected in a communication manner, and the limiting ring 10 and the annular groove 9 are slidably connected.

[0043] When filtration is required, the rotating disk 6 is rotated at a certain angle by the rotating component, so that the first filter hole 7 is connected to the second filter hole 8 at the adjacent position. This allows the drainage and flocculent precipitate after the drainage mixing reaction to flow through the first filter hole 7 into the inner cavity of the reaction tank 1 at the bottom of the outer shell 5, thus filtering the metal precipitate. During this process, the rotation of the rotating disk 6 can be limited by the contact and restriction between the inner surface of the annular groove 9 and the surface of the limiting ring 10.

[0044] Please refer to Figure 1-9As shown, the rotating component includes a second rotating rod 34 inserted through the middle of the stirring rod 3, a deflector plate 46 fixed to the outer circumference of the second rotating rod 34, a fixed seat 32 fixed at one end of the top of the reaction tank 1 in an L-shape, and positioning posts 47 provided on both sides of the deflector plate 46. The bottom of the positioning post 47 is fixed to the surface of the fixed seat 32, and the bottom of the second rotating rod 34 is fixed to the middle of the top surface of the rotating disk 6.

[0045] By rotating the actuating plate 46, the second rotating rod 34 can change its angle, thereby causing the rotating disk 6 to rotate. Due to the contact action of the two positioning posts 47 fixed to the fixed base 32, the rotation amplitude of the rotating disk 6 can be positioned. Thus, when the actuating plate 46 contacts one of the positioning posts 47, the first filter hole 7 is connected to the adjacent second filter hole 8. When it contacts the other positioning post 47, the first filter hole 7 is not connected to the adjacent second filter hole 8. Therefore, it will not flow to the bottom of the inner cavity of the reaction tank 1 when the drainage and coagulant are mixed and stirred.

[0046] Please refer to Figure 1-9 As shown, the anti-clogging component includes a movable disc 11 located at the bottom of the outer casing 5, a rod 12 uniformly fixed at the top of the movable disc 11, a rotating shaft 13 rotatably connected to the inner cavity of the reaction tank 1 located at the bottom of the movable disc 11, a cam 14 fixedly sleeved on the outer circumferential surface of the rotating shaft 13, and a first spring telescopic rod 15 fixed at both ends of the bottom of the movable disc 11. The surface of one end of the cam 14 abuts against the surface of the bottom of the movable disc 11, the bottom of the first spring telescopic rod 15 is fixed to the inner cavity surface of the reaction tank 1, and one side of the rotating shaft 13 passes through the reaction tank 1 and extends out of the outside of the reaction tank 1.

[0047] When the movable disk 11 rotates, it drives the cam 14 to rotate. Under the action of the contact between the rotating shaft 13 and the movable disk 11 and the rebound force of the first spring telescopic rod 15, the movable disk 11 can reciprocate in the vertical direction. This allows the insertion rod 12 to pass through the adjacent first filter hole 7 and second filter hole 8, thereby pushing the sediment blocking the first filter hole 7 and second filter hole 8 to the top of the outer shell 5. This prevents the outer shell 5 and the rotating disk 6 from becoming blocked when filtering metal sediment.

[0048] Please refer to Figure 1-9As shown, the drive assembly includes a motor 4 fixed to one side of the top of the reaction tank 1, a movable rod 19 rotatably connected to the other side of the top of the reaction tank 1, a rotating rod 18 rotatably connected to one side of the outer circumference of the reaction tank 1, a first bevel gear 20 fixedly sleeved at the external position of the extension of the stirring rod 3 on the reaction tank 1, a second bevel gear 21 fixedly sleeved on one side of the outer circumference of the motor 4 and the outer circumference of the movable rod 19, an insertion component for connecting the rotating rod 18 and the rotating shaft 13, a pulley 22 fixedly sleeved on the other side of the outer circumference of the movable rod 19, and a connecting belt 23 set at the middle position of the two pulleys 22. The first bevel gear 20 and the two second bevel gears 21 are meshed together.

[0049] When the motor 4 is started, its output drives one of the first bevel gears 20 to rotate. This, in turn, causes the stirring rod 3 to rotate due to the meshing action between the first bevel gear 20 and the second bevel gear 21. The stirring rod 3 then mixes the drainage and coagulant placed inside the reaction tank 1. When the stirring rod 3 rotates, the moving rod 19 rotates due to the meshing action between the first bevel gear 20 and the other second bevel gear 21. This, in turn, causes the rotating rod 18 to rotate due to the meshing action between the pulley 22 and the connecting belt 23. Through the plug-in component, when the anti-clogging component is in operation, the rotating rod 18 drives the rotating shaft 13 to rotate. The stirring rod 3 mixes the drainage and coagulant entering the reaction tank 1. The first filter hole 7 and the adjacent second filter hole 8 are not connected, so the rotating shaft 13 does not rotate.

[0050] Please refer to Figure 1-9 As shown, the plug-in component includes an inner groove 25 formed on one side surface of the rotating rod 18, an abutment groove 28 formed at the external position of the reaction tank 1 at the extension of the rotating shaft 13, a first threaded rod 24 threadedly connected to the middle position of the rotating rod 18, a movable block 26 rotatably connected to one side of the first threaded rod 24, a connecting shaft 30 slidably inserted into the inner cavity of one end of one side surface of the movable block 26, a damper 31 fixed to the inner cavity of the other end of one side surface of the movable block 26, and a connecting spring 29 fixed to one side surface of the connecting shaft 30. One side of the connecting spring 29 is fixed to one inner cavity of the movable block 26, one side of the damper 31 is fixed to the surface of the plug 27, and the surface of the movable block 26 is in contact with the inner cavity of the inner groove 25.

[0051] Due to the connection between the inner groove 25 and the movable block 26, the movable block 26 can only slide horizontally due to the resistance of the inner cavity of the inner groove 25 against it. Therefore, when the first threaded rod 24 is rotated and extends horizontally, the movable block 26, driven by the damper 31 and the connecting shaft 30, slides the insert 27 horizontally. During this process, if the insert 27 fails to directly embed into the inner cavity of the abutment groove 28, it will abut against the surface of the rotating shaft 13, thus causing the connecting spring... Spring 29 and damper 31 contract, and by rotating the rotating shaft 13 at a certain angle, the inner cavity of the contact groove 28 is aligned with the insert 27. Under the action of the spring force of the connecting shaft 30 and the damper 31, the insert 27 is inserted into the inner cavity of the contact groove 28. Thus, when the rotating rod 18 rotates, the rotating shaft 13 can be driven to rotate under the contact action of the insert 27 and the contact groove 28. When the rotating rod 18 needs to be stationary, the first threaded rod 24 is rotated in the opposite direction to make the insert 27 disengage from the inside of the contact groove 28.

[0052] Example 2:

[0053] Please refer to Figure 1-9 As shown, when filtering through the filter assembly, excessive flocculent mixture adheres to the inner circumferential surface of the reaction tank 1 located at the top of the outer shell 5 and the surface of the outer shell 5, which affects the mixing effect between the drainage and the coagulant during the next use.

[0054] This also includes a cleaning mechanism for cleaning the inner circumferential surface of the reaction vessel 1 and the surface of the outer shell 5;

[0055] The cleaning mechanism includes a sleeve 35 fixedly sleeved on the outer periphery of the stirring rod 3 at the position of the inner cavity of the reaction tank 1, first brush plates 41 symmetrically arranged on both sides of the bottom of the sleeve 35, a shaft seat 40 fixed on one side of the two first brush plates 41 close to each other, a second brush plate 42 arranged at the bottom of the stirring rod 3, a displacement component acting on the shaft seat 40, and an abutting component acting on the second brush plate 42.

[0056] The displacement component allows the first brush plate 41 to be attached to the inner circumferential surface of the reaction tank 1 at the top of the outer shell 5 when cleaning the inner cavity surface of the reaction tank 1 is required. As the stirring rod 3 rotates, the first brush plate 41 scrapes against the inner circumferential surface of the reaction tank 1, removing the flocculent precipitates attached to the inner circumferential surface of the reaction tank 1. When the first brush plate 41 is attached to the inner circumferential surface of the reaction tank 1, the action of the abutment component allows the second brush plate 42 to be attached to the surface of the outer shell 5. It can also rub against the surface of the outer shell 5 as the stirring rod 3 rotates, causing the attached flocculent precipitates to be removed. This allows the cleaning liquid to flow through the first filter hole 7 and the second filter hole 8 to the bottom of the inner cavity of the reaction tank 1. Thus, the attached precipitates on the inner circumferential surface of the reaction tank 1 and the surface of the outer shell 5 can be cleaned without affecting the rotation of the stirring rod 3.

[0057] Please refer to Figure 1-9 As shown, the displacement assembly includes a second threaded rod 36 rotatably connected to both sides of the inner cavity surface of the sleeve 35, a threaded sleeve 39 threadedly connected to the outer circumferential surface of the second threaded rod 36 at the position of the inner cavity of the sleeve 35, a first rotating rod 33 rotatably connected to the position of the inner cavity of the stirring rod 3, a third bevel gear 37 fixedly sleeved on the outer circumferential surface of the first rotating rod 33, and a fourth bevel gear 38 fixedly sleeved on the outer circumferential surface of the second threaded rod 36 at the position of the inner cavity of the stirring rod 3. The third bevel gear 37 and the fourth bevel gear 38 are meshed together. The inner cavity of the sleeve 35 is rotatably connected to the inner cavity surface of the stirring rod 3. One end of the first rotating rod 33 passes through the stirring rod 3 and extends to the outside of the stirring rod 3. The first rotating rod 33 and the second rotating rod 34 are connected by a through insertion. The inner cavity surface of the sleeve 35 is in contact with the surface of the threaded sleeve 39. The top of the bearing seat 40 is fixed to the surface of the adjacent threaded sleeve 39. The first rotating rod 33 is rotatably connected to the fixed seat 32.

[0058] By rotating the first rotating rod 33, the two second threaded rods 36 rotate synchronously under the meshing action between the third bevel gear 37 and the second threaded rod 36. This allows the threaded sleeve 39 to move horizontally under the action of the contact limit of the inner cavity surface of the sleeve 35 and the cooperation between the internal thread structure of the inner wall of the threaded sleeve 39. When it is necessary to clean the surface of the reaction tank 1, the two threaded sleeves 39 move away from each other, thereby causing the distance between the two sets of bearings 40 and the first brush plate 41 to change, so that they can fit against the inner circumferential surface of the reaction tank 1. The lengths of the two first brush plates 41 are not the same, so that the inner circumferential surface of the reaction tank 1 can be more thoroughly scraped and cleaned without hindering the second brush plate 42. When the stirring rod 3 stirs the drainage and coagulant, the bearings 40 and the first brush plate 41 move closer to each other, so that they do not affect the rotation state of the stirring rod 3.

[0059] Please refer to Figure 1-9 As shown, the abutment assembly includes a movable plate 43 that is slidably inserted through the stirring rod 3 at the bottom position of the second brush plate 42, a second spring telescopic rod 44 fixed to the surface of the stirring rod 3 at the top position of the movable plate 43, and an abutment plate 45 disposed at one end of the second brush plate 42. One side of the abutment plate 45 is fixed to the surface of the adjacent first brush plate 41, and one end of the first brush plate 41 is fixed to the surface of the abutment plate 45.

[0060] When the first brush plate 41 moves closer to the inner circumferential surface of the reaction vessel 1, it can drive the contact plate 45 to move. Under the contact action between the inclined surface of the contact plate 45 and the inclined surface of the second brush plate 42, the second spring telescopic rod 44 extends, so that the movable plate 43 can drive the second brush plate 42 to vertically downward and adhere to the surface of the outer shell 5. Under the contact action between the movable plate 43 and the stirring rod 3, the second brush plate 42 can rotate with the stirring rod 3 to perform a circular motion to clean the surface of the outer shell 5. When the first brush plate 41 moves closer to each other, the contact plate 45 separates from the second brush plate 42. Under the action of the rebound force of the second spring telescopic rod 44, the second brush plate 42 moves vertically upward and separates from the surface of the outer shell 5, so that it will not affect the rotation state of the stirring rod 3.

[0061] like Figure 10 As shown, a method for zero-discharge treatment of concentrated wastewater from power plants, employing the aforementioned zero-discharge treatment device for concentrated wastewater from power plants, includes the following steps:

[0062] S1: The power plant wastewater is transported to the inner cavity of the reaction tank 1 and coagulant is added inside. The motor 4 is started to make the stirring rod rotate to promote the wastewater and coagulant to fully mix and react. After a period of time, precipitates will be produced in the wastewater by the reaction. The motor 4 is then turned off.

[0063] S2: The toggle plate 46 drives the second rotating rod to rotate so that the first filter hole 7 and the second filter hole 8 are opposite each other. After rotating the first threaded rod 24 so that the insert 27 is embedded in the contact groove 28, the motor 4 is started again so that the insert rod 12 can go back and forth through the first filter hole 7 and the second filter hole 8 to perform filtration.

[0064] S3: After filtration is complete, turn off the motor 4, remove the housing 16 and seal the discharge pipe 2, add cleaning liquid into the discharge pipe 2, and then rotate the first rotating rod 33 to make the first brush plate 41 adhere to the inner circumferential surface of the reaction tank 1 and the second brush plate 42 adhere to the surface of the outer shell 5. Then start the motor 4 again to perform friction cleaning on the inner circumferential surface of the reaction tank 1 and the surface of the outer shell 5.

[0065] S4: After cleaning is completed, unseal the discharge pipe 2, reinstall the casing 16, and rotate the first threaded rod 24 to disengage the insert 27 from the inside of the contact groove 28. Then, rotate the first rotating rod 33 to separate the first brush plate 41, the second brush plate 42, and the inner circumferential surface of the reaction tank 1 from the surface of the outer casing 5. Finally, rotate the second rotating rod 34 to rotate the rotating disk 6 to keep the outer casing 5 in a sealed state, ready for the next stage of drainage.

Claims

1. A zero-discharge treatment device for concentrated wastewater from a power plant, comprising a reaction tank (1), a discharge pipe (2) fixed at the bottom of the reaction tank (1), and a stirring rod (3) rotatably connected to the middle of the reaction tank (1), characterized in that: It also includes a filtration and adjustment mechanism for separating sediments generated from drainage; The filtration adjustment mechanism includes a housing (16) threaded to the bottom of the outer periphery of the discharge pipe (2), a filter screen (17) fixed in the inner cavity of the housing (16), a filter disc assembly for separating heavy metal precipitates, an anti-clogging component acting on the filter disc assembly, and a drive component acting on the stirring rod (3) and the anti-clogging component. The filter assembly includes an outer shell (5) fixed at the middle position of the inner cavity of the reaction tank (1), a rotating disk (6) rotatably connected at the middle position of the inner cavity of the outer shell (5), first filter holes (7) evenly opened on the upper and lower surfaces of the outer shell (5), second filter holes (8) evenly opened through the surface of the rotating disk (6), an annular groove (9) opened in the inner cavity of the outer shell (5) near the outer circumferential surface of the rotating disk (6), a limiting ring (10) fixed to the outer circumferential surface of the rotating disk (6), and a rotating component for driving the rotating disk (6) to rotate. The anti-clogging component includes a movable disc (11) located at the bottom of the outer shell (5), a plug rod (12) uniformly fixed at the top of the movable disc (11), a rotating shaft (13) rotatably connected to the inner cavity of the reaction tank (1) located at the bottom of the movable disc (11), a cam (14) fixedly sleeved on the outer circumference of the rotating shaft (13), and a first spring telescopic rod (15) fixed at both ends of the bottom of the movable disc (11). The inner cavity of the first filter hole (7) is connected to the inner cavity of the adjacent second filter hole (8), the limiting ring (10) is slidably connected to the ring groove (9), the surface of one end of the cam (14) abuts against the bottom surface of the movable disk (11), the bottom of the first spring telescopic rod (15) is fixed to the inner cavity surface of the reaction barrel (1), and one side of the rotating shaft (13) passes through the reaction barrel (1) and extends out of the outside of the reaction barrel (1). The drive assembly includes a motor (4) fixed to one side of the top of the reaction tank (1), a movable rod (19) rotatably connected to the other side of the top of the reaction tank (1), a rotating rod (18) rotatably connected to one side of the outer circumference of the reaction tank (1), a first bevel gear (20) fixedly sleeved at the outer position of the extension of the stirring rod (3) on the outside of the reaction tank (1), a second bevel gear (21) fixedly sleeved on one side of the outer circumference of the motor (4) and the outer circumference of the movable rod (19), an insertion component for connecting the rotating rod (18) and the rotating shaft (13), a pulley (22) fixedly sleeved on the other side of the outer circumference of the movable rod (19), and a connecting belt (23) set at the middle position of the two pulleys (22). The first bevel gear (20) and the two second bevel gears (21) are meshed together. The plug-in component includes an inner groove (25) on one side surface of the rotating rod (18), an abutment groove (28) on the outside of the reaction tank (1) at the extension of the rotating shaft (13), a first threaded rod (24) threadedly connected to the middle position of the rotating rod (18), a movable block (26) rotatably connected to one side of the first threaded rod (24), a connecting shaft (30) slidably inserted into the inner cavity of one end of the surface of the movable block (26), a damper (31) fixed to the inner cavity of the other end of the surface of the movable block (26), and a connecting spring (29) fixed to one side surface of the connecting shaft (30). One side of the connecting spring (29) is fixed to one inner cavity of the movable block (26), one side of the damper (31) is fixed to the surface of the plug (27), and the surface of the movable block (26) is in contact with the inner cavity of the inner groove (25).

2. The zero-discharge treatment device for concentrated wastewater from power plants according to claim 1, characterized in that: The rotating component includes a second rotating rod (34) inserted through the middle of the stirring rod (3), a deflector plate (46) fixed to the outer circumference of the second rotating rod (34), a fixed seat (32) fixed at one end of the top of the reaction tank (1) in an L-shape, and positioning posts (47) set on both sides of the deflector plate (46). The bottom of the positioning post (47) is fixed to the surface of the fixed seat (32), and the bottom of the second rotating rod (34) is fixed to the middle of the top surface of the rotating disk (6).

3. The zero-discharge treatment device for concentrated wastewater from power plants according to claim 2, characterized in that: It also includes a cleaning mechanism for cleaning the inner circumferential surface of the reaction vessel (1) and the surface of the outer shell (5). The cleaning mechanism includes a sleeve (35) fixedly sleeved on the outer circumferential surface of the stirring rod (3) at the position of the inner cavity of the reaction vessel (1), a first brush plate (41) symmetrically arranged on both sides of the bottom of the sleeve (35), a shaft seat (40) fixed on one side of the two first brush plates (41) close to each other, a second brush plate (42) arranged at the bottom of the stirring rod (3), a displacement component acting on the shaft seat (40), and an abutment component acting on the second brush plate (42).

4. The zero-discharge treatment device for concentrated wastewater from power plants according to claim 3, characterized in that: The displacement assembly includes a second threaded rod (36) rotatably connected to both sides of the inner cavity surface of the sleeve (35), a threaded sleeve (39) threadedly connected to the outer circumferential surface of the second threaded rod (36) at the position of the inner cavity of the sleeve (35), a first rotating rod (33) rotatably connected to the position of the inner cavity of the stirring rod (3), a third bevel gear (37) fixedly sleeved on the outer circumferential surface of the first rotating rod (33), and a fourth bevel gear (38) fixedly sleeved on the outer circumferential surface of the second threaded rod (36) at the position of the inner cavity of the stirring rod (3). The third bevel gear (37) and the fourth bevel gear (38) are connected to each other. The wheels (38) are meshed together. The inner cavity of the sleeve (35) is rotatably connected to the inner cavity of the stirring rod (3). One end of the first rotating rod (33) passes through the stirring rod (3) and extends to the outside of the stirring rod (3). The first rotating rod (33) and the second rotating rod (34) are connected by a through insertion. The inner cavity of the sleeve (35) is in contact with the surface of the threaded sleeve (39). The top of the shaft seat (40) is fixed to the surface of the adjacent threaded sleeve (39). The first rotating rod (33) and the fixed seat (32) are rotatably connected.

5. The zero-discharge treatment device for concentrated wastewater from power plants according to claim 4, characterized in that: The abutment assembly includes a movable plate (43) that is slidably inserted through the stirring rod (3) at the bottom of the second brush plate (42), a second spring telescopic rod (44) fixed to the surface of the stirring rod (3) at the top of the movable plate (43), and an abutment plate (45) disposed at one end of the second brush plate (42). One side of the abutment plate (45) is fixed to the surface of the adjacent first brush plate (41), and one end of the first brush plate (41) is fixed to the surface of the abutment plate (45).

6. A method for zero-discharge treatment of concentrated wastewater from power plants, wherein the method employs the zero-discharge treatment device for concentrated wastewater from power plants as described in claim 5, characterized in that: Includes the following steps: S1: The power plant drainage is transported to the inner cavity of the reaction tank (1) and coagulant is added inside. The motor (4) is started to make the stirring rod rotate to promote the full mixing and reaction of the drainage and coagulant. After a period of time, precipitates will be generated in the drainage by the reaction. The motor (4) is then turned off. S2: The toggle plate (46) drives the second rotating rod to rotate so that the first filter hole (7) and the second filter hole (8) are opposite each other. Then, the first threaded rod (24) is rotated so that the insert (27) is embedded in the inside of the contact groove (28). Then, the motor (4) is started again so that the insert (12) can pass back and forth between the first filter hole (7) and the second filter hole (8) to perform filtration. S3: After filtration is completed, turn off the motor (4), remove the casing (16), seal the discharge pipe (2), add cleaning liquid into the discharge pipe (2), and then rotate the first rotating rod (33) to make the first brush plate (41) adhere to the inner circumferential surface of the reaction barrel (1) and the second brush plate (42) adhere to the surface of the outer shell (5). Then start the motor (4) again to perform friction cleaning on the inner circumferential surface of the reaction barrel (1) and the surface of the outer shell (5). S4: After cleaning is completed, unseal the discharge pipe (2), reinstall the casing (16), and rotate the first threaded rod (24) to disengage the insert (27) from the inside of the contact groove (28). Also, rotate the first rotating rod (33) to separate the first brush plate (41) from the second brush plate (42) and the inner circumference of the reaction tank (1) from the surface of the outer casing (5). Finally, rotate the second rotating rod (34) to rotate the rotating disk (6) to keep the outer casing (5) in a sealed state, ready for the next stage of drainage.

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