A wastewater treatment apparatus and method

Abstract

The application discloses a wastewater treatment equipment and method, and belongs to the technical field of sewage treatment. The wastewater treatment equipment comprises a sedimentation tank, a storage tank I, a storage tank II, an ultrafiltration device and a reverse osmosis filtration device. The storage tank I and the storage tank II are communicated with the sedimentation tank. The ultrafiltration device and the reverse osmosis filtration device are communicated. The sedimentation tank is provided with a sedimentation filtration device below. The wastewater calcium carbonate mixed solution flowing out of the sedimentation tank falls into the sedimentation filtration device. The sedimentation filtration device filters the wastewater calcium carbonate mixed solution. The filtrate enters the ultrafiltration device and the reverse osmosis filtration device in sequence. The wastewater treatment equipment is provided with the sedimentation filtration device. The sedimentation filtration device actively filters the wastewater calcium carbonate mixed solution and filters out the sediment. The problem of long-time waiting for the mixed solution to be stratified is solved. The wastewater treatment efficiency is greatly improved.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device and method. Background Technology

[0002] When using reverse osmosis to treat wastewater, if the wastewater has high hardness, the reverse osmosis membrane is prone to scaling and blockage as the concentration of calcium and magnesium ions in the wastewater increases during the treatment process, affecting the water production capacity and efficiency.

[0003] To address the aforementioned issues, some companies in the industry have adopted a method of installing a pipeline mixer on the transport pipeline from the wastewater storage tank to the sedimentation tank. A saturated sodium carbonate solution is added to the wastewater through the pipeline mixer to adjust the pH to 8-9. The sodium carbonate solution and wastewater react fully in the sedimentation tank to form a precipitate. After settling, the supernatant is taken and fed into an ultrafiltration system for ultrafiltration. The ultrafiltrate is then subjected to reverse osmosis filtration. This method reduces the total hardness of the ultrafiltration effluent to below 50 mg / L and the calcium hardness to below 20 mg / L. Compared to the original conditions without the addition of saturated sodium carbonate solution, where the calcium hardness was 500-1000 mg / L (calculated as calcium carbonate) and the total hardness was 800-1500 mg / L, the wastewater hardness is significantly reduced, effectively preventing scaling and clogging of the reverse osmosis membrane. However, the time required for the sodium carbonate solution and wastewater to fully react and form a precipitate in the sedimentation tank, followed by settling and stratification, is too long, disrupting production and resulting in low wastewater treatment efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a wastewater treatment device and method, which aims to solve the problem of low wastewater treatment efficiency mentioned in the background art.

[0005] To address the aforementioned problems, this invention proposes a wastewater treatment device, comprising a sedimentation tank, a first storage tank, a second storage tank, an ultrafiltration device, and a reverse osmosis filtration device. The first and second storage tanks are connected to the sedimentation tank, and the ultrafiltration device and the reverse osmosis filtration device are connected. A sedimentation filtration device is installed below the sedimentation tank. The wastewater calcium carbonate mixture flowing out of the sedimentation tank falls into the sedimentation filtration device, which filters the wastewater calcium carbonate mixture. The filtered clear liquid sequentially enters the ultrafiltration device and the reverse osmosis filtration device.

[0006] The sedimentation and filtration device includes two coaxially spaced arc-shaped side plates and an arc-shaped bottom plate at the bottom of the two arc-shaped side plates, as well as a baffle plate 1, a baffle plate 2, and a partition plate located between the two arc-shaped side plates and sealed and fixedly connected to the arc-shaped bottom plate. The baffle plate 1 and the baffle plate 2 are located at the two circumferential ends of the arc-shaped side plates, and the partition plate is located between the baffle plate 1 and the baffle plate 2, thereby defining a liquid storage area and a slag storage area between the two arc-shaped side plates and on both sides of the partition plate. The partition plate is provided with through holes that connect the liquid storage area and the slag storage area, and a filter screen is provided above the through holes in the slag storage area.

[0007] A liquid-collecting plate is provided between two arc-shaped side plates and above the partition. The liquid-collecting plate is sealed and fixedly connected to the two arc-shaped side plates. The upper surface of the liquid-collecting plate is inclined. The lowest point of the inclined surface is not located at both ends of the liquid-collecting plate in the circumferential direction of the arc-shaped side plates, thus defining a liquid-collecting area for storing wastewater calcium carbonate mixture between the two arc-shaped side plates and above the liquid-collecting plate. The highest point of the inclined surface is located at one end of the liquid-collecting plate in the circumferential direction of the arc-shaped side plates, and one end of the liquid-collecting plate is located directly above the slag storage area. A leakage hole is provided at the lowest point of the inclined surface. A control device is provided below the leakage hole. The control device controls the opening and closing of the leakage hole. When the leakage hole is open, the clear liquid in the liquid-collecting area falls into the liquid storage area through the leakage hole. The clear liquid in the liquid storage area flows into the ultrafiltration device.

[0008] The sedimentation and filtration device also includes a second sliding column coaxial with the arc-shaped side plate. The second sliding column is connected to a motor. A slip ring that can only slide along its axial direction is installed on the second sliding column. Multiple mounting rods are fixedly installed on the slip ring. A filter plate is installed on each mounting rod. The multiple filter plates are centrally symmetrically distributed with the second sliding column as the center. Driven by the motor, the filter plates slide against the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates to filter the wastewater calcium carbonate mixture in the liquid-collecting area.

[0009] At any given time, only one filter plate slides against the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates. When one of the filter plates just leaves one end of the liquid-collecting plate, the other filter plate located downstream of it rotates to the position directly above the other end of the liquid-collecting plate. After leaving one end of the liquid-collecting plate, the filter plate moves downward along the sliding column axis into the slag storage area. At the same time, the other filter plate moves downward along the sliding column axis and collides with the upper surface of the other end of the liquid-collecting plate, causing the sediment on the filter plate to fall onto the filter screen in the slag storage area.

[0010] When the filter plate slides along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates past the leakage hole, the leakage hole opens. When the filter plate slides along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates to one end of the liquid-collecting plate, the leakage hole closes to prevent the unfiltered calcium carbonate mixture of wastewater from flowing away through the leakage hole.

[0011] In one embodiment, the arc-shaped bottom plate, baffle one, baffle two, partition, and two arc-shaped side plates are sealed and fixedly connected.

[0012] In one embodiment, during the process of the motor driving the filter plate to rotate, the first baffle and the second baffle do not contact the filter plate;

[0013] The motor is fixedly connected to the arc-shaped side plate via a frame;

[0014] The motor is equipped with an angle sensor to detect the rotation angle of the second slide.

[0015] In one embodiment, the baffle is provided with a drain pipe that communicates with the liquid storage area, and the drain pipe is connected to the ultrafiltration device through a suction pipe.

[0016] In one embodiment, the liquid-holding plate includes a first liquid-holding plate, a second liquid-holding plate, and a third liquid-holding plate. The first, second, and third liquid-holding plates are sealed and fixedly connected to two arc-shaped side plates. The first and third liquid-holding plates are located on both sides of the second liquid-holding plate and are sealed and fixedly connected to the second liquid-holding plate. The upper surfaces of the first and third liquid-holding plates are both inclined surfaces, and the lower ends of the inclined surfaces are connected to the second liquid-holding plate. The upper end of the inclined surface of the first liquid-holding plate is lower than the upper end of the inclined surface of the third liquid-holding plate. The upper end of the inclined surface of the third liquid-holding plate is located directly above the slag storage area. The upper surface of the second liquid-holding plate is not higher than the lower ends of the inclined surfaces of the first and third liquid-holding plates. The leakage hole is located on the second liquid-holding plate.

[0017] In one embodiment, the control device includes:

[0018] The mounting bracket is fixedly connected to the lower surface of the liquid-holding plate;

[0019] A sliding column is located below the leakage hole and is coaxial with the leakage hole. The sliding column is axially slidably mounted on the mounting bracket. A sealing plug is fixedly mounted on the upper end of the sliding column. The sliding column moves upward axially to push the sealing plug into the leakage hole to block the leakage hole. A liquid receiving hopper is provided directly below the sealing plug and is sealed and fixedly connected to the sliding column. The clear liquid flowing out of the leakage hole falls into the liquid receiving hopper. The clear liquid in the liquid receiving hopper falls into the liquid storage area. The clear liquid in the liquid receiving hopper does not contact the mounting bracket, armature, spring and electromagnet.

[0020] An armature is fixedly connected to the lower end of a sliding column. A spring is sleeved on the sliding column. The lower end of the spring is connected to the armature, and the upper end of the spring is connected to the mounting bracket.

[0021] An electromagnet, located below the armature and fixedly connected to the mounting bracket, attracts the armature to descend when energized, causing the sliding column to move axially downward to separate the sealing plug from the leakage hole and stretch the spring.

[0022] When the electromagnet is de-energized, the spring pulls the sliding column to move upward in one direction, causing the sealing plug to be inserted into the leakage hole to block the leakage hole, and the upper surface of the sealing plug is flush with the upper opening of the leakage hole.

[0023] In one embodiment, the sedimentation tank is equipped with a stirring device.

[0024] In one embodiment, the bottom of the sedimentation tank is provided with a liquid outlet pipe four, and a control valve three is provided on the liquid outlet pipe four. The wastewater calcium carbonate mixture to be filtered flowing out of the liquid outlet pipe four enters the liquid holding area from one end of the liquid holding plate.

[0025] In one embodiment, the filter plate is inclined. When the filter plate slides along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates to one end of the liquid-collecting plate, the injection of the wastewater calcium carbonate mixture to be filtered into the liquid-collecting area is paused. After the filter plate leaves one end of the liquid-collecting plate, the injection of the wastewater calcium carbonate mixture to be filtered into the liquid-collecting area continues, so as to prevent the wastewater calcium carbonate mixture to be filtered from falling onto the inclined side of the filter plate.

[0026] Furthermore, the present invention also proposes a wastewater treatment method, which employs any of the aforementioned wastewater treatment devices to perform the following steps:

[0027] Wastewater stored in storage tank one and saturated sodium carbonate solution stored in storage tank two are injected into sedimentation tank through pipelines. The pH value of the wastewater in sedimentation tank is adjusted to 8-9 so that the sodium carbonate solution and wastewater can react fully in sedimentation tank.

[0028] After the reaction is completed, the wastewater calcium carbonate mixture containing the precipitate is injected into the liquid holding area. The wastewater calcium carbonate mixture containing the precipitate is filtered through the sedimentation filtration device to obtain the precipitate and the clear liquid. The precipitate collects on the filter screen in the slag storage area, and the clear liquid collects in the liquid storage area.

[0029] The clear liquid in the storage area is injected into the ultrafiltration device for ultrafiltration, and the ultrafiltrate after ultrafiltration is then injected into the reverse osmosis filtration device for reverse osmosis filtration.

[0030] Beneficial effects: The wastewater treatment equipment of the present invention is equipped with a sedimentation and filtration device. The sedimentation and filtration device is driven by a motor to rotate multiple filter plates that are centrally symmetrically distributed. During the rotation of the filter plates, at any given time, only one filter plate slides against the upper surface of the liquid-collecting plate and the side wall of the arc-shaped side plate, filtering the wastewater calcium carbonate mixture between the two arc-shaped side plates and on the liquid-collecting plate, actively removing the sediment. The filtered clear liquid is discharged from the leakage hole and falls into the liquid storage area. The clear liquid in the liquid storage area enters the ultrafiltration device for ultrafiltration in sequence. The ultrafiltrate obtained after ultrafiltration then enters the reverse osmosis filtration device for reverse osmosis filtration. By actively filtering the wastewater calcium carbonate mixture through the sedimentation and filtration device and removing the sediment, the trouble of waiting for the mixture to settle and separate into layers for a long time is eliminated, which greatly improves the wastewater treatment efficiency.

[0031] In addition, the filtered sediment is pushed away from the liquid-collecting plate by the filter plate and falls into the sludge storage area. After the filter plate leaves the upper surface of the liquid-collecting plate, it falls into the sludge storage area until another filter plate falls onto the upper surface of the liquid-collecting plate. During this process, the vibration generated by the rigid collision between the other filter plate and the upper surface of the liquid-collecting plate shakes the sediment on the filter plate falling into the sludge storage area. This ensures that the filter plate is always clean, eliminating the trouble of frequent filter plate cleaning and improving filtration efficiency. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a wastewater treatment device according to the present invention;

[0034] Figure 2 This is a schematic diagram of the sedimentation and filtration device. Figure 1 ;

[0035] Figure 3 This is a schematic diagram of the sedimentation and filtration device. Figure 2 ;

[0036] Figure 4 yes Figure 3 A schematic diagram after removing the liquid collection plate;

[0037] Figure 5 This is a schematic diagram of the sedimentation and filtration device. Figure 3 ;

[0038] Figure 6 yes Figure 5 A schematic diagram after removing liquid-holding plate one and liquid-holding plate three;

[0039] Figure 7 This is a schematic diagram of the sedimentation and filtration device. Figure 4 ;

[0040] Figure 8 This is a schematic diagram of the sedimentation and filtration device. Figure 5 .

[0041] The annotations in the attached figures are explained as follows:

[0042] 1. Arc-shaped side plate; 2. Arc-shaped bottom plate; 3. Baffle 1; 4. Baffle 2; 5. Partition; 6. Drain pipe; 7. Liquid storage area; 8. Slag storage area; 9. Through hole; 10. Filter screen; 11. Liquid holding plate 1; 12. Liquid holding plate 2; 13. Liquid holding plate 3; 14. Mounting bracket; 15. Sliding column 1; 16. Spring; 17. Armature; 18. Electromagnet; 19. Liquid receiving hopper; 20. Sealing plug; 21. Frame; 22. Motor; 23. Sliding column 2; 24. Slip ring; 25. Mounting rod; 26. Filter plate; 27. Leakage hole; 28. Angle sensor; 29. ​​Liquid holding area;

[0043] 30. Sedimentation tank; 31. Piping; 32. Storage tank one; 33. Discharge pipe one; 34. Control valve one; 35. Storage tank two; 36. Discharge pipe two; 37. Control valve two; 38. pH meter; 39. Suction pipe; 41. Ultrafiltration device; 42. Infusion pipe; 43. Reverse osmosis filtration device; 44. Discharge pipe three; 45. Support;

[0044] 46. ​​Stirring device; 47. Liquid outlet pipe four; 48. Control valve three; 49. Base; 50. Filtration zone. Detailed Implementation

[0045] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0046] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0047] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0048] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0049] This invention proposes a wastewater treatment device and method. The wastewater treatment device is equipped with a sedimentation and filtration device. The sedimentation and filtration device is driven by a motor 22 to rotate multiple filter plates 26 that are centrally symmetrically distributed. During the rotation of the filter plates 26, at any given time, only one filter plate 26 slides against the upper surface of the liquid-holding plate and the side wall of the arc-shaped side plate 1, filtering the wastewater calcium carbonate mixture between the two arc-shaped side plates 1 and on the liquid-holding plate, actively removing the sediment. The filtered clear liquid is discharged from the leakage hole 27 and falls into the liquid storage area 7. The clear liquid in the liquid storage area 7 enters the ultrafiltration device 41 for ultrafiltration. The ultrafiltrate obtained after ultrafiltration then enters the reverse osmosis filtration device 43 for reverse osmosis filtration. By actively filtering the wastewater calcium carbonate mixture through the sedimentation and filtration device and removing the sediment, the hassle of waiting for the mixture to settle and separate into layers for a long time is eliminated, greatly improving the wastewater treatment efficiency.

[0050] Furthermore, the filtered sediment is pushed away from the liquid-collecting plate by the filter plate 26 and falls into the slag storage area 8. After the filter plate 26 leaves the upper surface of the liquid-collecting plate, it falls into the slag storage area 8 until another filter plate 26 falls onto the upper surface of the liquid-collecting plate. During this process, the vibration generated by the rigid collision between the other filter plate 26 and the upper surface of the liquid-collecting plate shakes off the sediment on the filter plate 26 that falls into the slag storage area 8. This ensures that the filter plate 26 is always clean, eliminating the trouble of frequently cleaning the filter plate 26, saving time and effort, and eliminating the need to stop the machine to clean or replace the filter plate 26, without delaying filtration production and improving filtration efficiency.

[0051] Specifically, in one embodiment of the invention, such as Figure 1As shown, the wastewater treatment equipment includes a sedimentation tank 30, a first storage tank 32, a second storage tank 35, an ultrafiltration device 41, and a reverse osmosis filtration device 43. The first storage tank 32 stores wastewater to be treated and is equipped with an outlet pipe 33, which is fitted with a control valve 34. The second storage tank 35 stores a saturated sodium carbonate solution and is equipped with an outlet pipe 36, which is fitted with a control valve 37. Liquid pipe 33 and liquid outlet pipe 36 are connected to sedimentation tank 30 via pipe 31. Sedimentation tank 30 is equipped with a pH measuring instrument 38 to detect the pH value of the wastewater in sedimentation tank 30. After the wastewater stored in storage tank 32 and the saturated sodium carbonate solution stored in storage tank 35 are injected into sedimentation tank 30 through pipe 31, the pH value of the wastewater in sedimentation tank 30 is adjusted to 8-9, so that the sodium carbonate solution and wastewater can fully react in sedimentation tank 30 to form a wastewater-calcium carbonate mixture containing precipitate.

[0052] In this embodiment, as Figure 1 As shown, the ultrafiltration device 41 and the reverse osmosis filtration device 43 are connected by a delivery pipe 42, and are fixedly connected by a bracket 45. The sedimentation tank 30 is fixedly installed on the base 49, and the filtration zone 50 is located below the sedimentation tank 30. The filtration zone 50 is used to house the sedimentation filtration device, which is used to filter the wastewater calcium carbonate mixture containing precipitate. Specifically, as shown... Figure 1 As shown, the bottom of the sedimentation tank 30 is provided with a liquid outlet pipe 47, and a control valve 48 is installed on the liquid outlet pipe 47. The wastewater calcium carbonate mixture containing precipitate in the sedimentation tank 30 can be discharged through the liquid outlet pipe 47 and fall into the sedimentation filtration device below it. The sedimentation filtration device filters the wastewater calcium carbonate mixture, removes the precipitate, and obtains a clear liquid. The filtered clear liquid first enters the ultrafiltration device 41 for ultrafiltration, and the obtained ultrafiltrate then enters the reverse osmosis filtration device 43 for reverse osmosis filtration. The bottom of the reverse osmosis filtration device 43 is provided with a liquid outlet pipe 44, and the water obtained after reverse osmosis filtration is discharged from the liquid outlet pipe 44. The sedimentation filtration device actively filters the wastewater calcium carbonate mixture, removes the precipitate, eliminates the trouble of waiting for the mixture to settle and separate for a long time, and greatly improves the wastewater treatment efficiency.

[0053] Specifically, in this embodiment, such as Figures 2-8As shown, the sedimentation filtration device includes two coaxially spaced arc-shaped side plates 1 and an arc-shaped bottom plate 2 located at the bottom of the two arc-shaped side plates 1, as well as a baffle 3, a baffle 4, and a partition 5 located between the two arc-shaped side plates 1 and sealed and fixedly connected to the arc-shaped bottom plate 2. The radii of the two arc-shaped side plates 1 are unequal, while the thickness and curvature of the two arc-shaped side plates 1 are equal. The arc-shaped bottom plate 2, baffle 3, baffle 4, and partition 5 are sealed and fixedly connected to the two arc-shaped side plates 1. This design ensures that the arc-shaped bottom plate... The connection between plate 2, baffle 3, baffle 4, partition 5, and arc-shaped side plate 1 will not leak. The arc-shaped bottom plate 2 defines an arc-shaped groove between the two arc-shaped side plates 1. Baffle 3 and baffle 4 are located at the circumferential ends of the arc-shaped side plate 1, thus the ends of the arc-shaped groove are blocked by baffle 3 and baffle 4 to form an arc-shaped receiving area. The partition 5 is located between baffle 3 and baffle 4, thereby dividing the arc-shaped receiving area into two parts, namely the liquid storage area 7 and the slag storage area 8. Figures 2-8 As shown, the area of ​​the liquid storage zone 7 is larger than that of the sludge storage zone 8. The liquid storage zone 7 is used to store the filtered clear liquid, and the sludge storage zone 8 is used to store the filtered precipitate. Removing the baffle 3 allows the clear liquid in the liquid storage zone 7 to flow out. Of course, it can also be done as follows: Figure 2 As shown, a drain pipe 6 connected to the liquid storage area 7 is provided on the baffle 3. The drain pipe 6 is connected to the ultrafiltration device 41 through the suction pipe 39. The opening and closing of the drain pipe 6 is controlled to realize the discharge of the clear liquid.

[0054] In this embodiment, as Figure 4 As shown, the partition 5 is provided with a through hole 9 connecting the liquid storage area 7 and the slag storage area 8, as... Figure 2 As shown, a filter screen 10 is provided above the through hole 9 in the slag storage area 8. The sediment falls onto the filter screen 10 and gathers on the filter screen 10. The sediment that just falls onto the filter screen 10 is still rich in liquid. The liquid that overflows from the sediment is filtered by the filter screen 10 and drips into the bottom of the slag storage area 8, where it gathers and then flows out from the through hole 9 into the liquid storage area 7. When a large amount of sediment accumulates on the filter screen 10, it can be cleaned up in time.

[0055] In this embodiment, as Figures 2-8 As shown, a liquid-holding plate is provided between the two arc-shaped side plates 1 and above the partition plate 5. The liquid-holding plate is sealed and fixedly connected to the two arc-shaped side plates 1. With this design, there will be no leakage at the connection between the liquid-holding plate and the two arc-shaped side plates 1. The upper surface of the liquid-holding plate is a slope, and the lowest point of the slope is not located at the two ends of the liquid-holding plate circumferentially on the arc-shaped side plates 1. With this design, a liquid-holding area 29 for storing wastewater calcium carbonate mixture containing precipitate can be defined between the two arc-shaped side plates 1 and above the liquid-holding plate. The wastewater calcium carbonate mixture to be filtered is injected into the liquid-holding area 29 for temporary storage.

[0056] Specifically, such as Figure 5As shown, the liquid-holding plate includes a first liquid-holding plate 11, a second liquid-holding plate 12, and a third liquid-holding plate 13. The first liquid-holding plate 11, the second liquid-holding plate 12, and the third liquid-holding plate 13 are sealed and fixedly connected to two arc-shaped side plates 1. The first liquid-holding plate 11 and the third liquid-holding plate 13 are respectively located on both sides of the second liquid-holding plate 12 and are sealed and fixedly connected to the second liquid-holding plate 12. This design prevents leakage at the connection points of the first liquid-holding plate 11, the second liquid-holding plate 12, the third liquid-holding plate 13, and the arc-shaped side plates 1. The upper surfaces of both the first liquid-collecting plate 11 and the third liquid-collecting plate 13 are inclined, and the lower ends of the inclined surfaces connect to the second liquid-collecting plate 12. The upper surface of the second liquid-collecting plate 12 is not higher than the lower ends of the inclined surfaces of the first liquid-collecting plate 11 and the third liquid-collecting plate 13. This design forms a liquid-collecting zone 29 above the first liquid-collecting plate 11, the second liquid-collecting plate 12, and the third liquid-collecting plate 13. The deepest point of the temporarily stored wastewater calcium carbonate mixture to be filtered in the liquid-collecting zone 29 is located at the second liquid-collecting plate 12. Figure 5 The arrow in the diagram indicates the filling position of the wastewater-calcium carbonate mixture to be filtered into the liquid collection area 29, which is after the sedimentation and filtration device is placed in the filtration area 50. Figure 1 The outlet tube 47 needs to be located in Figure 5 Directly above the middle arrow, the wastewater calcium carbonate mixture to be filtered in the outlet pipe 47 falls into the liquid collection area 29 from the position indicated by the arrow, and flows along the upper surface of the liquid collection plate 3 13 toward the liquid collection plate 2 12.

[0057] In this embodiment, as Figures 3-5 As shown, the high end of the inclined surface of the liquid-holding plate 11 is lower than the high end of the inclined surface of the liquid-holding plate 13. The high end of the inclined surface of the liquid-holding plate 13 is located directly above the slag storage area 8. This design allows one filter plate 26 to move axially downward along the sliding column 23 into the slag storage area 8 after leaving the liquid-holding plate 13. At the same time, the other filter plate 26 moves axially downward along the sliding column 23 and collides with the upper surface of the liquid-holding plate 11, causing the sediment on one of the filter plates 26 to fall onto the filter screen 10 in the slag storage area 8.

[0058] In this embodiment, as Figure 5 As shown, a drain hole 27 is provided at the lowest point of the liquid holding plate 12. The lowest point of the liquid holding plate 12 is also the lowest point of the upper surface of the entire liquid holding plate. This design facilitates the smooth drainage of the filtered clear liquid in the liquid holding area 29 through the drain hole 27.

[0059] In this embodiment, a control device is provided below the leakage hole 27. The control device controls the opening and closing of the leakage hole 27. When the leakage hole 27 is open, the clear liquid in the liquid holding area 29 falls into the liquid storage area 7 through the leakage hole 27.

[0060] In this embodiment, as Figure 2As shown, the sedimentation and filtration device also includes a second sliding column 23 coaxial with the arc-shaped side plate 1. The second sliding column 23 is connected to a motor 22, which drives the second sliding column 23 to rotate. The motor 22 is fixedly connected to the arc-shaped side plate 1 via a frame 21. A slip ring 24, which can only slide along its axial direction, is installed on the second sliding column 23. The slip ring 24 can only slide axially up and down on the second sliding column 23 and cannot rotate. This design allows the second sliding column 23 to drive the slip ring 24 to rotate synchronously, while the slip ring 24 can also slide up and down along the axial direction of the second sliding column 23. Multiple mounting rods 25 are fixedly installed on the slip ring 24, and the mounting rods 25 are located on the arc-shaped side plate 1. A filter plate 26 is installed on each mounting rod 25. Multiple filter plates 26 are centrally symmetrically distributed around the sliding column 23. Driven by the motor 22, the filter plates 26 can enter between the two arc-shaped side plates 1 and slide against the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates 1 under their own weight. The filter plates 26 are rigid, thus they can slide close to the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates 1 to filter the wastewater calcium carbonate mixture containing precipitates in the liquid-collecting area 29, and scrape away the precipitates adhering to the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates 1. The direction in which the motor 22 drives the filter plates 26 to rotate is as follows: Figure 4 As shown by the middle arrow, Figure 5 As shown, when the filter plate 26 slides along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates 1 past the leakage hole 27, the leakage hole 27 opens, and the clear liquid filtered by the filter plate 26 is discharged from the leakage hole 27. When the filter plate 26 continues to slide along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates 1 until... Figure 5 When the wastewater calcium carbonate mixture to be filtered, as indicated by the middle arrow, enters the filling position of the liquid collection area 29, in order to prevent the wastewater calcium carbonate mixture to be filtered from flowing to the liquid collection plate 12 without being filtered by the filter plate 26 and flowing away from the leakage hole 27, it is necessary to close the leakage hole 27 in time using the control device until the next filter plate 26 enters between the two arc-shaped side plates 1 again, and slides along the upper surface of the liquid collection plate and the side walls of the two arc-shaped side plates 1 through the leakage hole 27 before opening the leakage hole 27. This design ensures that the filtered clear liquid is discharged from the leakage hole 27 and falls into the liquid storage area 7, and the unfiltered wastewater calcium carbonate mixture will not be discharged from the leakage hole 27.

[0061] In this embodiment, the filter plate 26 is vertically arranged; preferably, the filter plate 26 is inclined, such as... Figures 2-8 As shown, this design helps to shake off the sediment on the filter plate 26 thoroughly, thus improving the cleaning effect of the filter plate 26.

[0062] In this embodiment, when the filter plate 26 is tilted, when the filter plate 26 slides against the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates 1, Figure 5When the wastewater-calcium carbonate mixture to be filtered, as indicated by the middle arrow, enters the filling position of the holding area 29, it is necessary to immediately control control valve three 48 to close the outlet pipe four 47, pausing the injection of the wastewater-calcium carbonate mixture to be filtered into the holding area 29. The injection of the wastewater-calcium carbonate mixture to be filtered can only continue after the filter plate 26 leaves the filling position. This design aims to prevent the wastewater-calcium carbonate mixture to be filtered from falling onto the upper surface of the inclined filter plate 26, causing subsequent sedimentation that mixes into the filtered clear liquid. This is because the descent of the filter plate 26 and its collision with the holding plate cannot remove the sediment from the upper surface of the filter plate 26. Even after all the sediment is shaken off, some sediment remains on the upper surface of the filter plate 26. When the filter plate 26 re-enters between the two arc-shaped side plates 1 and slides along the upper surface of the liquid-holding plate and the side walls of the two arc-shaped side plates 1, the sediment mixes into the filtered clear liquid, contaminating the clear liquid. In addition, the inclined setting of the filter plate 26 ensures that all the sediment filtered by the filter plate 26 is located on the lower surface of the filter plate 26. When the filter plate 26 descends and collides with the liquid-holding plate, it can shake off all the sediment on the lower surface of the filter plate 26. Compared with the vertical setting of the filter plate 26, the inclined setting of the filter plate 26 is conducive to improving the removal effect of sediment on the filter plate 26 by collision.

[0063] In this embodiment, as Figures 2-6 As shown, at any given time, only one filter plate 26 slides against the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates 1. When one of the filter plates 26 just leaves the high end of the liquid-collecting plate 13, the other filter plate 26, located downstream of it in the direction of rotation, just rotates to directly above the high end of the liquid-collecting plate 11. After leaving the high end of the liquid-collecting plate 13, one of the filter plates 26 moves downward along the axis of the sliding column 23 into the slag storage area 8. At the same time, the other filter plate 26 moves downward along the axis of the sliding column 23 and is above the high end of the liquid-collecting plate 11. The surface collision shakes the sediment on one of the filter plates 26 and it falls onto the filter screen 10 in the slag storage area 8, thus ensuring that the filter plate 26 is clean. This eliminates the trouble of regularly cleaning the filter plate 26, saving time and effort. There is no need to stop the machine to clean or replace the filter plate 26, so the filtration production is not delayed, and the filtration efficiency is significantly improved. Of course, the sediment that is filtered down by the filter plate 26 and does not adhere to the lower surface of the filter plate 26 will fall directly from the liquid holding plate 3 13 onto the filter screen 10 in the slag storage area 8 after the filter plate 26 leaves the upper end of the liquid holding plate 3 13.

[0064] In this embodiment, during the rotation of the filter plate 26 driven by the motor 22, the first baffle 3 and the second baffle 4 do not contact the filter plate 26. This design ensures that during the rotation of the filter plate 26 driven by the motor 22, the filter plate 26 can slide smoothly up and down along the axis of the second sliding column 23 and smoothly enter and exit between the two arc-shaped side plates 1 without colliding with the first baffle 3 and the second baffle 4.

[0065] In this embodiment, as Figure 2As shown, the motor 22 is equipped with an angle sensor 28, which is used to detect the rotation angle of the slide column 23 so as to control the opening and closing of the leakage hole 27 in a timely manner. For example, when the control device is a control valve, the angle sensor 28 transmits the detection data to the controller, and the controller controls the control valve to open and close automatically, so as to realize the automatic control of the opening and closing of the leakage hole 27.

[0066] Preferred, such as Figures 6-8 As shown, the control device includes: a mounting bracket 14, a sliding column 15, an armature 17, and an electromagnet 18. The mounting bracket 14 is fixedly connected to the lower surface of the liquid-holding plate. The sliding column 15 is located below the leakage hole 27 and is coaxial with the leakage hole 27. The sliding column 15 is axially slidably mounted on the mounting bracket 14. A sealing plug 20 is coaxially fixedly mounted on the upper end of the sliding column 15. The sliding column 15 moves axially upward to push the sealing plug 20 into the leakage hole 27 to block the leakage hole 27. Preferably, the sealing plug... The sealing plug 20 is frustoconical in shape, which helps to improve the sealing effect. A liquid receiving hopper 19 is located directly below the sealing plug 20 and is sealed and fixedly connected to the sliding column 15. The clear liquid flowing from the leakage hole 27 falls into the liquid receiving hopper 19, and the clear liquid in the liquid receiving hopper 19 falls into the liquid storage area 7. The design of the liquid receiving hopper 19 ensures that the clear liquid in the liquid receiving hopper 19 does not come into contact with the mounting bracket 14, armature 17, spring 16, and electromagnet 18, protecting the mounting bracket 14, armature 17, spring 16, and electromagnet 18 from contact and ensuring their cleanliness and safety. The lower end of the armature 17 is fixedly connected to the lower end of the sliding column 15. A spring 16 is sleeved on the sliding column 15. The lower end of the spring 16 is connected to the armature 17, and the upper end of the spring 16 is connected to the mounting bracket 14. The electromagnet 18 is located below the armature 17 and is fixedly connected to the mounting bracket 14. When the electromagnet 18 is energized, it attracts the armature 17 to descend, causing the sliding column 15 to move axially downward, separating the sealing plug 20 from the leakage hole 27, opening the leakage hole 27, and stretching the spring 16. When the electromagnet 18 is de-energized, the... Spring 16 pulls slide column 15 upward axially, causing sealing plug 20 to be inserted into leakage hole 27, blocking leakage hole 27 and closing leakage hole 27. At this time, the upper surface of sealing plug 20 is flush with the upper opening of leakage hole 27. This control device design can prevent unfiltered wastewater calcium carbonate mixture from remaining in leakage hole 27, because filter plate 26 slides against the upper surface of liquid-collecting plate to filter wastewater calcium carbonate mixture, and cannot filter wastewater calcium carbonate mixture in leakage hole 27. Therefore, the control device of this embodiment is designed. By filling leakage hole 27 with sealing plug 20, making the upper surface of sealing plug 20 flush with the upper opening of leakage hole 27, unfiltered wastewater calcium carbonate mixture remains in leakage hole 27, ensuring filtration effect. At the same time, the controller controls the electromagnet 18 to turn on and off according to the detection data of angle sensor 28, thereby realizing automatic control of opening and closing of leakage hole 27.

[0067] Furthermore, such as Figure 1As shown, the sedimentation tank 30 is equipped with a stirring device 46. The stirring device 46 stirs the wastewater calcium carbonate mixture in the sedimentation tank 30, so that the sodium carbonate solution and wastewater react quickly and fully in the sedimentation tank 30 to form a wastewater calcium carbonate mixture containing precipitate. The stirring device 46 helps to shorten the reaction time and improve efficiency.

[0068] Furthermore, the present invention also proposes a wastewater treatment method, which employs any of the aforementioned wastewater treatment devices to perform the following steps:

[0069] Wastewater stored in storage tank 1 32 and saturated sodium carbonate solution stored in storage tank 2 35 are injected into sedimentation tank 30 through pipe 31. The pH value of the wastewater in sedimentation tank 30 is adjusted to 8-9 so that the sodium carbonate solution and wastewater can react fully in sedimentation tank 30. If necessary, stirring device 46 can be started to accelerate the reaction process.

[0070] After the reaction is completed, control valve 348 is opened, and liquid outlet pipe 447 is used to inject the wastewater calcium carbonate mixture containing precipitate into the sedimentation tank 30 into the liquid collection area 29. The wastewater calcium carbonate mixture containing precipitate is filtered through the sedimentation filtration device to obtain precipitate and clear liquid. The precipitate collects on the filter screen 10 in the slag storage area 8, and the clear liquid collects in the liquid storage area 7.

[0071] The clear liquid in the storage area 7 is injected into the ultrafiltration device 41 through the suction pipe 39 for ultrafiltration. The ultrafiltrate after ultrafiltration is then injected into the reverse osmosis filtration device 43 for reverse osmosis filtration.

[0072] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A wastewater treatment device, comprising a sedimentation tank, a first storage tank, a second storage tank, an ultrafiltration device, and a reverse osmosis filtration device, wherein the first and second storage tanks are connected to the sedimentation tank, and the ultrafiltration device and the reverse osmosis filtration device are connected, characterized in that, A sedimentation and filtration device is installed below the sedimentation tank. The wastewater calcium carbonate mixture flowing out of the sedimentation tank falls into the sedimentation and filtration device. The sedimentation and filtration device filters the wastewater calcium carbonate mixture. The filtered clear liquid enters the ultrafiltration device and the reverse osmosis filtration device in sequence. The sedimentation and filtration device includes two coaxially spaced arc-shaped side plates and an arc-shaped bottom plate at the bottom of the two arc-shaped side plates, as well as a baffle plate 1, a baffle plate 2, and a partition plate located between the two arc-shaped side plates and sealed and fixedly connected to the arc-shaped bottom plate. The baffle plate 1 and the baffle plate 2 are located at the two circumferential ends of the arc-shaped side plates, and the partition plate is located between the baffle plate 1 and the baffle plate 2, thereby defining a liquid storage area and a slag storage area between the two arc-shaped side plates and on both sides of the partition plate. The partition plate is provided with through holes that connect the liquid storage area and the slag storage area, and a filter screen is provided above the through holes in the slag storage area. A liquid-collecting plate is provided between two arc-shaped side plates and above the partition. The liquid-collecting plate is sealed and fixedly connected to the two arc-shaped side plates. The upper surface of the liquid-collecting plate is inclined. The lowest point of the inclined surface is not located at both ends of the liquid-collecting plate in the circumferential direction of the arc-shaped side plates, thus defining a liquid-collecting area for storing wastewater calcium carbonate mixture between the two arc-shaped side plates and above the liquid-collecting plate. The highest point of the inclined surface is located at one end of the liquid-collecting plate in the circumferential direction of the arc-shaped side plates, and one end of the liquid-collecting plate is located directly above the slag storage area. A leakage hole is provided at the lowest point of the inclined surface. A control device is provided below the leakage hole. The control device controls the opening and closing of the leakage hole. When the leakage hole is open, the clear liquid in the liquid-collecting area falls into the liquid storage area through the leakage hole. The clear liquid in the liquid storage area flows into the ultrafiltration device. The sedimentation and filtration device also includes a second sliding column coaxial with the arc-shaped side plate. The second sliding column is connected to a motor. A slip ring that can only slide along its axial direction is installed on the second sliding column. Multiple mounting rods are fixedly installed on the slip ring. A filter plate is installed on each mounting rod. The multiple filter plates are centrally symmetrically distributed with the second sliding column as the center. Driven by the motor, the filter plates slide against the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates to filter the wastewater calcium carbonate mixture in the liquid-collecting area. At any given time, only one filter plate slides against the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates. When one of the filter plates just leaves one end of the liquid-collecting plate, the other filter plate located downstream of it rotates to the position directly above the other end of the liquid-collecting plate. After leaving one end of the liquid-collecting plate, the filter plate moves downward along the sliding column axis into the slag storage area. At the same time, the other filter plate moves downward along the sliding column axis and collides with the upper surface of the other end of the liquid-collecting plate, causing the sediment on the filter plate to fall onto the filter screen in the slag storage area. When the filter plate slides along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates past the leakage hole, the leakage hole opens. When the filter plate slides along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates to one end of the liquid-collecting plate, the leakage hole closes to prevent the unfiltered calcium carbonate mixture of wastewater from flowing away through the leakage hole.

2. The wastewater treatment equipment as described in claim 1, characterized in that, The arc-shaped bottom plate, baffle one, baffle two, partition, and two arc-shaped side plates are sealed and fixedly connected.

3. The wastewater treatment equipment as described in claim 1, characterized in that, During the process of the motor driving the filter plate to rotate, the first baffle and the second baffle do not contact the filter plate. The motor is fixedly connected to the arc-shaped side plate via a frame; The motor is equipped with an angle sensor to detect the rotation angle of the second slide.

4. The wastewater treatment equipment as described in claim 1, characterized in that, The baffle is provided with a drain pipe that communicates with the liquid storage area, and the drain pipe is connected to the ultrafiltration device through a suction pipe.

5. The wastewater treatment equipment as described in claim 1, characterized in that, The liquid-holding plate includes a first liquid-holding plate, a second liquid-holding plate, and a third liquid-holding plate. The first, second, and third liquid-holding plates are sealed and fixedly connected to two arc-shaped side plates. The first and third liquid-holding plates are located on both sides of the second liquid-holding plate and are sealed and fixedly connected to the second liquid-holding plate. The upper surfaces of the first and third liquid-holding plates are both inclined surfaces, and the lower ends of the inclined surfaces are connected to the second liquid-holding plate. The upper end of the inclined surface of the first liquid-holding plate is lower than the upper end of the inclined surface of the third liquid-holding plate. The upper end of the inclined surface of the third liquid-holding plate is located directly above the slag storage area. The upper surface of the second liquid-holding plate is not higher than the lower ends of the inclined surfaces of the first and third liquid-holding plates. The leakage hole is located on the second liquid-holding plate.

6. The wastewater treatment equipment as described in claim 1, characterized in that, The control device includes: The mounting bracket is fixedly connected to the lower surface of the liquid-holding plate; A sliding column is located below the leakage hole and is coaxial with the leakage hole. The sliding column is axially slidably mounted on the mounting bracket. A sealing plug is fixedly mounted on the upper end of the sliding column. The sliding column moves upward axially to push the sealing plug into the leakage hole to block the leakage hole. A liquid receiving hopper is provided directly below the sealing plug and is sealed and fixedly connected to the sliding column. The clear liquid flowing out of the leakage hole falls into the liquid receiving hopper. The clear liquid in the liquid receiving hopper falls into the liquid storage area. The clear liquid in the liquid receiving hopper does not contact the mounting bracket, armature, spring and electromagnet. An armature is fixedly connected to the lower end of a sliding column. A spring is sleeved on the sliding column. The lower end of the spring is connected to the armature, and the upper end of the spring is connected to the mounting bracket. An electromagnet, located below the armature and fixedly connected to the mounting bracket, attracts the armature to descend when energized, causing the sliding column to move axially downward to separate the sealing plug from the leakage hole and stretch the spring. When the electromagnet is de-energized, the spring pulls the sliding column to move upward in one direction, causing the sealing plug to be inserted into the leakage hole to block the leakage hole, and the upper surface of the sealing plug is flush with the upper opening of the leakage hole.

7. The wastewater treatment equipment as described in claim 1, characterized in that, The sedimentation tank is equipped with a stirring device.

8. The wastewater treatment equipment as described in claim 1, characterized in that, The bottom of the sedimentation tank is provided with a liquid outlet pipe four, and a control valve three is provided on the liquid outlet pipe four. The wastewater calcium carbonate mixture to be filtered flowing out of the liquid outlet pipe four enters the liquid holding area from one end of the liquid holding plate.

9. The wastewater treatment equipment as described in claim 1, characterized in that, The filter plate is tilted. When the filter plate slides along the upper surface of the liquid-collecting plate and the side walls of the two arc-shaped side plates to one end of the liquid-collecting plate, the injection of the wastewater calcium carbonate mixture to be filtered into the liquid-collecting area is paused. After the filter plate leaves one end of the liquid-collecting plate, the injection of the wastewater calcium carbonate mixture to be filtered into the liquid-collecting area continues, so as to prevent the wastewater calcium carbonate mixture to be filtered from falling onto the upward-sloping side of the filter plate.

10. A wastewater treatment method, characterized in that, The wastewater treatment equipment according to any one of claims 1-9 is used to perform the following steps: Wastewater stored in storage tank one and saturated sodium carbonate solution stored in storage tank two are injected into sedimentation tank through pipelines. The pH value of the wastewater in sedimentation tank is adjusted to 8-9 so that the sodium carbonate solution and wastewater can react fully in sedimentation tank. After the reaction is completed, the wastewater calcium carbonate mixture containing the precipitate is injected into the liquid holding area. The wastewater calcium carbonate mixture containing the precipitate is filtered through the sedimentation filtration device to obtain the precipitate and the clear liquid. The precipitate collects on the filter screen in the slag storage area, and the clear liquid collects in the liquid storage area. The clear liquid in the storage area is injected into the ultrafiltration device for ultrafiltration, and the ultrafiltrate after ultrafiltration is then injected into the reverse osmosis filtration device for reverse osmosis filtration.

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