Device and method for treating heavy metal wastewater

Abstract

The present invention discloses a device and method for treating heavy metal wastewater, which relates to the field of sewage treatment, including a reaction cylinder, a wastewater inlet and a reagent inlet are arranged on the top of the reaction cylinder, a drain pipe is arranged on the side of the reaction cylinder, a control valve is arranged on the drain pipe, and a hollow shaft is rotatably connected to the inside of the reaction cylinder, and the hollow shaft is driven by a motor. The device and method for treating heavy metal wastewater can capture and collect the impure heavy metal solid particles in the heavy metal wastewater during the treatment of the heavy metal wastewater through the mutual cooperation between the stirring plate, the water inlet, the hollow shaft, and the inclined filter plate, and under the mutual cooperation between the electric telescopic rod, the sealing plate and the adapter, while the heavy metal solid particles are packaged and captured normally, the wastewater can also be fully mixed and stirred when the initial reagent is put in, so as to ensure the sufficient separation of heavy metal ions in the heavy metal wastewater.

Description

Technical Field

[0001] The invention relates to sewage treatment technology, and in particular to a device and method for treating heavy metal wastewater. Background Art

[0002] Heavy metal wastewater mainly comes from drainage in mines, leaching water in waste rock yards, washing water of plated parts in electroplating plants, pickling drainage in steel plants, etc. Due to the characteristics of heavy metals such as long residual period and inability to be decomposed or degraded by organisms, these heavy metals enter and accumulate in organisms through the food chain, posing a serious threat to organisms. Therefore, when these wastewaters are discharged and reused, the heavy metals contained in them need to be removed. At present, chemicals are generally added to the wastewater to make the heavy metal ions react with the chemicals to form water-insoluble solid precipitates, and then the heavy metal ions are separated from the water by precipitation. However, in actual application, it takes time for metal ions to react to form solid precipitates, and it also takes a long time for the solid precipitates to precipitate after formation, resulting in a long treatment time for heavy metal wastewater.

[0003] A Chinese invention patent with publication number CN116253419B discloses a heavy metal wastewater precipitation device. The heavy metal wastewater precipitation device, by providing a filter assembly, can remove the sediment in the water while stirring to accelerate the reaction speed of the heavy metal precipitant and the heavy metal wastewater, so that the precipitation operation and the filtering operation can be carried out simultaneously, which greatly improves the treatment efficiency of the heavy metal wastewater, effectively reduces the residue of the sediment, reduces the cleaning difficulty of the staff, and protects the device from damage. However, in the actual application process, in the above patent, although it can collect the heavy metal solid particles in the heavy metal wastewater, its filter assembly During the rotation of the component, it is unable to effectively stir the heavy metal wastewater, resulting in the inability of the reagent to quickly react with the heavy metal ions in the wastewater to form heavy metal solid particles after being added. In addition, the two filters in the filter assembly will be repeatedly opened and closed during operation. When the two filters are closed, the solid particles between the two filters can be flushed into the through-port under the impact of the water flow. However, when the two filters are closed, they are in a horizontal state as a whole, which makes the flushing effect of the wastewater in the cylinder relatively general, and it is impossible to more effectively flush the solid particles between the two filters into the through-port for discharge, resulting in a low discharge efficiency of the collected heavy metal particles. Summary of the invention

[0004] The object of the present invention is to provide a device and method for treating heavy metal wastewater to solve the above-mentioned deficiencies in the prior art.

[0005] In order to achieve the above-mentioned object, the present invention provides the following technical scheme: a device for treating heavy metal wastewater, comprising a reaction cylinder, wherein a wastewater inlet and a reagent inlet are arranged on the top of the reaction cylinder, a drain pipe is arranged on the side of the reaction cylinder, a control valve is arranged on the drain pipe, a hollow shaft is rotatably connected inside the reaction cylinder, the hollow shaft is driven by a motor, a plurality of groups of stirring plates are arranged at equal intervals from top to bottom on the outside of the hollow shaft, the stirring plates are hollow inside, and the stirring plates are connected to the inside of the hollow shaft, and the stirring plates are connected to the inside of the hollow shaft. Two rows of water inlets are provided on one side surface of the mixing plate, a drainage hole is provided on the other side of the mixing plate, the water flow rate of the drainage hole is less than the water flow rate of the water inlet, a cavity is provided at the bottom of the reaction cylinder, the interior of the cavity is divided by a partition to form a water collection tank and a waste collection tank, an inclined filter plate corresponding to the position of the hollow rotating shaft is fixedly installed on the top of the partition, a circulation pump is installed outside the reaction cylinder, and a water suction pipe and a water delivery pipe are respectively connected to the outside of the circulation pump, the water suction pipe is connected to the inside of the water collection tank, and the water delivery pipe is connected to the inside of the reaction cylinder;

[0006] A sealing plate is slidably connected to the side of the stirring plate close to the water inlet, and an adapter corresponding to the water inlet is opened on the surface of the sealing plate. A closing portion is formed between adjacent adapters in the same row, and the closing portion can close the water inlet. An electric telescopic rod is fixedly installed on the side of the stirring plate away from the water inlet.

[0007] Furthermore, the inclined filter plate includes a filtering portion and a guiding portion, the filtering portion is located corresponding to the water collecting trough, the guiding portion is located corresponding to the waste collecting trough, and a collecting box located below the guiding portion is placed inside the waste collecting trough.

[0008] Furthermore, guide grooves are provided at the top and bottom of the stirring plate, the longitudinal cross-section of the guide groove is ⊥-shaped, the inner side of the guide groove is slidably connected with a guide block, the upper and lower guide blocks are fixedly connected to the sealing plate, a waterproof box is fixedly installed on the surface of the stirring plate, a connecting plate is fixedly connected to the outside of the sealing plate, the electric telescopic rod is installed inside the waterproof box, and the telescopic end of the electric telescopic rod passes through the waterproof box and is fixedly connected to the connecting plate.

[0009] Furthermore, the bottom of the outer side of the hollow rotating shaft is in a circular ring shape and is equidistantly fixed with a number of auxiliary plates, the auxiliary plates are inclined, and when the hollow rotating shaft rotates to drive the stirring plate to rotate to collect solid particles in the heavy metal wastewater, the hollow rotating shaft also drives the auxiliary plates to rotate to transport the bottom wastewater upward.

[0010] Furthermore, a rotary connector is installed at the bottom of the hollow shaft, a liquid drain box is installed at the bottom of the rotary connector, a fixing frame is fixedly installed at the top of the inner wall of the cavity, and a vibration motor is fixedly installed at the bottom of the inclined filter plate.

[0011] Furthermore, the rotary connector includes an upper rotating part and a lower rotating part, the hollow rotating shaft is fixedly connected to the upper rotating part of the rotary connector, the fixing frame is fixedly connected to the lower rotating part of the rotary connector, and the drain box is fixedly connected to the bottom end of the lower rotating part of the rotary connector, the bottom shape of the drain box is rectangular, and the bottom length of the drain box is adapted to the length of the filter part.

[0012] Furthermore, a plurality of cleaning wheels corresponding to the water inlet are rotatably connected to one side of the inner wall of the stirring plate close to the drainage hole, and an impeller is coaxially and fixedly connected to the outside of the cleaning wheel.

[0013] Furthermore, the two rows of impellers on the same stirring plate rotate in opposite directions. When the heavy metal wastewater passes through the water inlet and drives the impeller to rotate, the upper and lower rows of impellers can simultaneously drive the cleaning wheel to rotate and push the solid particles inside the stirring plate toward the side close to the hollow rotating shaft.

[0014] Furthermore, the cleaning plates on two adjacent cleaning wheels are arranged alternately.

[0015] A method for treating heavy metal wastewater, applied to the above-mentioned device for treating heavy metal wastewater, comprises the following steps:

[0016] S1. Injecting the heavy metal wastewater to be treated and the reagent that reacts with the heavy metal ions into the reaction cylinder through the wastewater inlet and the reagent inlet;

[0017] S2. The hollow rotating shaft is driven by a motor to rotate, so that the stirring plate and the auxiliary plate rotate synchronously to fully mix and stir the heavy metal wastewater and the reaction reagent, thereby promoting the reaction of heavy metal ions to form solid particles;

[0018] S3, extend the telescopic end of the electric telescopic rod and drive the sealing plate to move, so that the adapter on the sealing plate is aligned with the water inlet on the stirring plate. At this time, the stirring plate rotates to capture part of the wastewater, so that it enters the inside of the stirring plate from the water inlet and passes through the hollow rotating shaft and is discharged from the bottom end thereof;

[0019] S4, filtering the wastewater discharged from the bottom of the hollow shaft through the inclined filter plate, so that the filtered wastewater falls into the water collection tank, and the filtered solid particles fall into the collection box in the waste collection tank;

[0020] S5, pumping the wastewater in the water collection tank through the circulation pump and the water suction pipe, and delivering it to the reaction cylinder through the water delivery pipe;

[0021] S6. After the heavy metals in the wastewater are removed, open the control valve so that the drain pipe is opened to discharge the wastewater.

[0022] Compared with the prior art, the device and method for treating heavy metal wastewater provided by the present invention have the following beneficial effects:

[0023] 1. The device and method for treating heavy metal wastewater can capture and collect the impure heavy metal solid particles in the heavy metal wastewater during the treatment through the mutual cooperation between the stirring plate, the water inlet, the hollow rotating shaft and the inclined filter plate. Moreover, with the mutual cooperation between the electric telescopic rod, the sealing plate and the adapter, the heavy metal solid particles can be normally captured while the wastewater is fully mixed and stirred when the initial reagent is added, so as to ensure the sufficient separation of heavy metal ions in the heavy metal wastewater.

[0024] 2. The device and method for treating heavy metal wastewater, through the setting of the auxiliary plate, can drive the auxiliary plate to rotate synchronously through the hollow rotating shaft during the process of capturing heavy metal solid particles, so that the auxiliary plate can stir the wastewater at the bottom of the reaction tube upward, so that the bottom wastewater can entrain the heavy metal solid particles deposited at the bottom of the reaction tube to move upward, so that the heavy metal particles obtained by the reaction in the wastewater can be better captured by the water inlet on the stirring plate, thereby further improving the treatment efficiency of the heavy metal wastewater.

[0025] 3. The device and method for treating heavy metal wastewater, through the cooperation between the impeller and the cleaning wheel, can drive the impeller to rotate when the wastewater passes through the water inlet and enters the interior of the stirring plate. The rotation of the impeller drives the cleaning wheel to rotate synchronously, so that the cleaning wheel can push the solid particles squeezed in the drainage hole, so that it can better enter the hollow shaft together with the wastewater for discharge and collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0027] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0028] Figure 2 The embodiment of the present invention provides Figure 1 Enlarged structural diagram of point A in the middle

[0029] Figure 3 A schematic diagram of the internal structure of a reaction tube provided in an embodiment of the present invention;

[0030] Figure 4A schematic diagram of the position structure of the liquid drain box and the inclined filter plate provided in an embodiment of the present invention;

[0031] Figure 5 A schematic diagram of the structure provided by an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of a partial cross-sectional structure of a sealing plate and a waterproof box provided in an embodiment of the present invention;

[0033] Figure 7 A schematic diagram of the structure of a stirring plate provided in an embodiment of the present invention;

[0034] Figure 8 A schematic diagram of a partial cross-sectional structure of a stirring plate provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Reaction cylinder; 101. Wastewater inlet; 102. Reagent inlet; 103. Drain pipe; 104. Control valve; 2. Hollow shaft; 21. Stirring plate; 22. Water inlet; 23. Drain hole; 24. Partition; 25. Water collecting tank; 26. Waste collecting tank; 27. Inclined filter plate; 271. Filter part; 272. Guide part; 28. Circulation pump; 29. ​​Suction pipe; 210. Water supply pipe; 211. Collection box; 3. Sealing plate; 31. Adapter; 32. Closing part; 33. Electric telescopic rod; 34. Guide groove; 35. Guide block; 36. Waterproof box; 37. Connecting plate; 4. Auxiliary plate; 5. Rotary connector; 51. Drain box; 52. Fixing frame; 53. Vibration motor; 6. Cleaning wheel; 61. Impeller. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0038] Example 1: Please refer to Figure 1-Figure 8A device for treating heavy metal wastewater comprises a reaction cylinder 1, a wastewater inlet 101 and a reagent inlet 102 are arranged on the top of the reaction cylinder 1, a drain pipe 103 is arranged on the side of the reaction cylinder 1, a control valve 104 is arranged on the drain pipe 103, a hollow shaft 2 is rotatably connected inside the reaction cylinder 1, the hollow shaft 2 is driven by a motor, a plurality of stirring plates 21 are arranged equidistantly from top to bottom on the outside of the hollow shaft 2, the stirring plates 21 are hollow inside, and the stirring plates 21 are connected to the inside of the hollow shaft 2, and two rows of water inlet ports are opened on one side of the stirring plate 21. A drain hole 23 is provided on the other side of the stirring plate 21, the water flow rate of the drain hole 23 is less than the water flow rate of the water inlet 22, a cavity is provided at the bottom of the reaction cylinder 1, the interior of the cavity is divided by a partition 24 to form a water collection tank 25 and a waste collection tank 26, an inclined filter plate 27 corresponding to the position of the hollow rotating shaft 2 is fixedly installed on the top of the partition 24, a circulating pump 28 is installed outside the reaction cylinder 1, and the outside of the circulating pump 28 is respectively connected to a water suction pipe 29 and a water supply pipe 210, the water suction pipe 29 is connected to the inside of the water collection tank 25, and the water supply pipe 210 is connected to the inside of the reaction cylinder 1;

[0039] A sealing plate 3 is slidably connected to the side of the stirring plate 21 close to the water inlet 22. An adapter port 31 corresponding to the water inlet 22 is provided on the surface of the sealing plate 3. A closing portion 32 is formed between adjacent adapter ports 31 in the same row. The closing portion 32 can close the water inlet 22. An electric telescopic rod 33 is fixedly installed on the side of the stirring plate 21 away from the water inlet 22.

[0040] It should be supplemented that the inclined filter plate 27 includes a filter portion 271 and a guide portion 272. The position of the filter portion 271 corresponds to the water collecting trough 25, and the position of the guide portion 272 corresponds to the waste collecting trough 26. A collection box 211 located below the guide portion 272 is placed inside the waste collecting trough 26.

[0041] It should be noted that a material taking port corresponding to the waste collecting tank 26 is provided on the surface of the reaction cylinder 1 , and an opening and closing door is provided at the material taking port, so as to facilitate the subsequent taking out of the collection box 211 in the waste collecting tank 26 .

[0042] In order to ensure the stability of the sealing plate 3 when it slides on the surface of the stirring plate 21, guide grooves 34 are provided on the top and bottom of the stirring plate 21. The longitudinal cross-section of the guide groove 34 is ⊥-shaped. The inner side of the guide groove 34 is slidably connected with a guide block 35. The upper and lower guide blocks 35 are fixedly connected to the sealing plate 3. A waterproof box 36 is fixedly installed on the surface of the stirring plate 21. A connecting plate 37 is fixedly connected to the outside of the sealing plate 3. The electric telescopic rod 33 is installed inside the waterproof box 36, and the telescopic end of the electric telescopic rod 33 passes through the waterproof box 36 and is fixedly connected to the connecting plate 37.

[0043] During operation, the heavy metal wastewater to be treated and the reagents that react with the heavy metal ions are injected into the reaction cylinder 1 through the wastewater inlet 101 and the reagent inlet 102. Then, the hollow rotating shaft 2 is driven to rotate by the motor, so that the stirring plate 21 and the auxiliary plate 4 are synchronously rotated to fully mix and stir the heavy metal wastewater and the reaction reagents, and promote the reaction of the heavy metal ions to form solid particles. After that, the electric telescopic rod 33 is extended at the telescopic end and drives the sealing plate 3 to move, so that the adapter 31 on the sealing plate 3 moves to align with the water inlet 22 on the stirring plate 21. At this time, when the stirring plate 21 rotates, it will capture part of the wastewater and make it enter the inside of the stirring plate 21 from the water inlet 22. At the same time, the heavy metal solid particles mixed in the wastewater will move with it into the inside of the stirring plate 21;

[0044] The wastewater and heavy metal solid particles entering the stirring plate 21 will pass through the stirring plate 21 into the interior of the hollow rotating shaft 2 and be discharged from the bottom end thereof. The discharged wastewater will fall on the inclined filter plate 27, from which the impure heavy metal solid particles in the wastewater can be filtered out, so that the filtered wastewater is gathered in the water collection tank 25, and the filtered heavy metal solid particles can slide down along the inclined surface of the inclined filter plate 27 to the collection box 211 in the waste collection tank 26. During this process, the circulating pump 28 is in working state. With the cooperation of the suction pipe 29 and the water supply pipe 210, the circulating pump 28 can pump the waste liquid in the water collection tank 25 into the working chamber inside the reaction cylinder 1, so that the heavy metal ions in the waste liquid can be separated more fully.

[0045] Example 2: Please refer to Figure 3 The bottom of the outer side of the hollow shaft 2 is in a circular ring shape and is equidistantly fixed with several auxiliary plates 4. The auxiliary plates 4 are tilted. When the hollow shaft 2 rotates to drive the stirring plate 21 to rotate to collect solid particles in the heavy metal wastewater, the hollow shaft 2 also drives the auxiliary plates 4 to rotate to transport the bottom wastewater upward.

[0046] During the process of collecting and removing solid particles formed by the reaction of heavy metal ions, the auxiliary plate 4 is driven to rotate synchronously by the hollow rotating shaft 2, so that the auxiliary plate 4 can stir the wastewater at the bottom of the reaction tube 1 upward, so that the bottom wastewater can entrain the heavy metal solid particles deposited at the bottom of the reaction tube 1 and move upward, so that the heavy metal particles obtained by the reaction in the wastewater can be better captured by the water inlet 22 on the stirring plate 21, thereby further improving the treatment efficiency of heavy metal wastewater.

[0047] Example 3: Please refer to Figure 3-Figure 4 A rotary connector 5 is installed at the bottom of the hollow shaft 2, a drainage box 51 is installed at the bottom of the rotary connector 5, a fixing frame 52 is fixedly installed on the top of the inner wall of the cavity, and a vibration motor 53 is fixedly installed at the bottom of the inclined filter plate 27.

[0048] It should be supplemented that the rotary connector 5 includes an upper rotating part and a lower rotating part, the hollow rotating shaft 2 is fixedly connected to the upper rotating part of the rotary connector 5, the fixing frame 52 is fixedly connected to the lower rotating part of the rotary connector 5, and the drain box 51 is fixedly connected to the bottom end of the lower rotating part of the rotary connector 5, the bottom shape of the drain box 51 is rectangular, and the bottom length of the drain box 51 is compatible with the length of the filter part 271.

[0049] During use, the drain box 51 is fixed by the fixing frame 52, so that the normal rotation of the hollow shaft 2 will not affect the state of the drain box 51. At the same time, the waste water is discharged downward through the drain box 51, so that the diffusion range during discharge is wider, thereby filtering the impure metal solid particles therein more quickly, and with the cooperation of the vibration motor 53, the inclined filter plate 27 can be driven to vibrate, so that the heavy metal solid particles on its surface can roll down along its inclined surface more quickly into the collection box 211, and at the same time, the clogging of the inclined filter plate 27 can be effectively avoided.

[0050] Example 4: Please refer to Figure 7 A plurality of cleaning wheels 6 corresponding to the water inlet 22 are rotatably connected to the inner wall of the stirring plate 21 near the drainage hole 23 , and an impeller 61 is coaxially fixedly connected to the outside of the cleaning wheel 6 .

[0051] It should be added that the two rows of impellers 61 on the same stirring plate 21 rotate in opposite directions. When the heavy metal wastewater passes through the water inlet 22 to drive the impeller 61 to rotate, the upper and lower rows of impellers 61 can simultaneously drive the cleaning wheel 6 to rotate and push the solid particles inside the stirring plate 21 toward the side close to the hollow rotating shaft 2.

[0052] Furthermore, the cleaning plates on two adjacent cleaning wheels 6 are staggered so that the cleaning range of the cleaning wheels 6 is maximized.

[0053] In the process of heavy metal wastewater passing through the water inlet 22 and entering the interior of the stirring plate 21, the flowing heavy metal wastewater will drive the impeller 61 at the water inlet 22 to rotate, and the rotation of the impeller 61 will drive the cleaning wheel 6 to rotate. The rotation of the cleaning wheel 6 can push the solid particles squeezed in the drainage hole 23, so that the solid particles can better enter the hollow shaft 2 together with the flow of wastewater, and the blockage of the drainage hole 23 can be effectively avoided.

[0054] Embodiment 5: A method for treating heavy metal wastewater, applied to the above-mentioned device for treating heavy metal wastewater, comprises the following steps:

[0055] S1, injecting the heavy metal wastewater to be treated and the reagent that reacts with the heavy metal ions into the reaction cylinder 1 through the wastewater inlet 101 and the reagent inlet 102;

[0056] S2, driving the hollow shaft 2 to rotate by a motor, so that the stirring plate 21 and the auxiliary plate 4 rotate synchronously to fully mix and stir the heavy metal wastewater and the reaction reagent, and promote the reaction of heavy metal ions to form solid particles;

[0057] S3, the electric telescopic rod 33 is extended and the sealing plate 3 is driven to move, so that the adapter 31 on the sealing plate 3 is aligned with the water inlet 22 on the stirring plate 21. At this time, the stirring plate 21 rotates to capture part of the wastewater, so that it enters the inside of the stirring plate 21 from the water inlet 22 and passes through the hollow rotating shaft 2 and is discharged from the bottom end thereof;

[0058] S4, filtering the wastewater discharged from the bottom of the hollow shaft 2 through the inclined filter plate 27, so that the filtered wastewater falls into the water collection tank 25, and the filtered solid particles fall into the collection box 211 in the waste collection tank 26;

[0059] S5, the waste water in the water collection tank 25 is pumped by the circulation pump 28 and the water suction pipe 29, and is transported to the reaction cylinder 1 through the water delivery pipe 210;

[0060] S6. After the heavy metals in the wastewater are removed, the control valve 104 is opened so that the drain pipe 103 is opened to discharge the wastewater.

[0061] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A device for treating heavy metal wastewater, comprising a reaction cylinder (1), wherein a wastewater inlet (101) and a reagent inlet (102) are arranged at the top of the reaction cylinder (1), a drainage pipe (103) is arranged on the side of the reaction cylinder (1), and a control valve (104) is arranged on the drainage pipe (103), characterized in that: The reaction cylinder (1) is rotatably connected to a hollow rotating shaft (2) inside, the hollow rotating shaft (2) is driven by a motor, and a plurality of stirring plates (21) are arranged on the outside of the hollow rotating shaft (2) in equidistant order from top to bottom, the stirring plates (21) are hollow inside, and the stirring plates (21) are connected to the inside of the hollow rotating shaft (2), one side surface of the stirring plates (21) is provided with two rows of water inlets (22), and the other side of the stirring plates (21) is provided with drainage holes (23), the water flow rate of the drainage holes (23) is smaller than the water flow rate of the water inlets (22), A cavity is provided at the bottom of the reaction cylinder (1), the interior of the cavity is divided by a partition (24) to form a water collecting tank (25) and a waste collecting tank (26), an inclined filter plate (27) corresponding to the position of the hollow rotating shaft (2) is fixedly installed on the top of the partition (24), a circulation pump (28) is installed on the outside of the reaction cylinder (1), and the outside of the circulation pump (28) is respectively connected to a water suction pipe (29) and a water supply pipe (210), the water suction pipe (29) is connected to the inside of the water collecting tank (25), and the water supply pipe (210) is connected to the inside of the reaction cylinder (1); A sealing plate (3) is slidably connected to the side of the stirring plate (21) close to the water inlet (22); a surface of the sealing plate (3) is provided with an adapting opening (31) corresponding to the water inlet (22); a sealing portion (32) is formed between adjacent adapting openings (31) in the same row; the sealing portion (32) can seal the water inlet (22); and an electric telescopic rod (33) is fixedly mounted on the side of the stirring plate (21) away from the water inlet (22); A plurality of cleaning wheels (6) corresponding to the water inlet (22) are rotatably connected to the inner wall of the stirring plate (21) on one side close to the drainage hole (23), and an impeller (61) is coaxially and fixedly connected to the outside of the cleaning wheel (6); The two rows of impellers (61) on the same stirring plate (21) rotate in opposite directions. When the heavy metal wastewater passes through the water inlet (22) to drive the impellers (61) to rotate, the upper and lower rows of impellers (61) can simultaneously drive the cleaning wheel (6) to rotate and push the solid particles inside the stirring plate (21) toward the side close to the hollow rotating shaft (2); The cleaning plates on two adjacent cleaning wheels (6) are arranged in a staggered manner.

2. A device for treating heavy metal wastewater according to claim 1, characterized in that: The inclined filter plate (27) comprises a filtering portion (271) and a guiding portion (272); the position of the filtering portion (271) corresponds to the water collecting trough (25); the position of the guiding portion (272) corresponds to the waste collecting trough (26); and a collecting box (211) located below the guiding portion (272) is placed inside the waste collecting trough (26).

3. A device for treating heavy metal wastewater according to claim 2, characterized in that: The top and bottom of the stirring plate (21) are both provided with a guide groove (34), the longitudinal cross-section of the guide groove (34) being in the shape of a ⊥, the inner side surface of the guide groove (34) being slidably connected to a guide block (35), the upper and lower guide blocks (35) being fixedly connected to the sealing plate (3), the surface of the stirring plate (21) being fixedly mounted with a waterproof box (36), the outside of the sealing plate (3) being fixedly connected with a connecting plate (37), the electric telescopic rod (33) being mounted inside the waterproof box (36), and the telescopic end of the electric telescopic rod (33) passing through the waterproof box (36) being fixedly connected to the connecting plate (37).

4. The device for treating heavy metal wastewater according to claim 3, characterized in that: The bottom of the outer side surface of the hollow rotating shaft (2) is equidistantly fixed with a plurality of auxiliary plates (4) in a circular ring shape. The auxiliary plates (4) are arranged at an angle. When the hollow rotating shaft (2) rotates to drive the stirring plate (21) to rotate to collect solid particles in the heavy metal wastewater, the hollow rotating shaft (2) also drives the auxiliary plates (4) to rotate to transport the bottom wastewater upward.

5. The device for treating heavy metal wastewater according to claim 4, characterized in that: A rotary connector (5) is mounted at the bottom of the hollow rotating shaft (2), a liquid drain box (51) is mounted at the bottom of the rotary connector (5), a fixing frame (52) is fixedly mounted at the top of the inner wall of the cavity, and a vibration motor (53) is fixedly mounted at the bottom of the inclined filter plate (27).

6. The device for treating heavy metal wastewater according to claim 5, characterized in that: The rotary connector (5) comprises an upper rotary part and a lower rotary part, the hollow rotary shaft (2) is fixedly connected to the upper rotary part of the rotary connector (5), the fixing frame (52) is fixedly connected to the lower rotary part of the rotary connector (5), and the drainage box (51) is fixedly connected to the bottom end of the lower rotary part of the rotary connector (5), the bottom of the drainage box (51) is rectangular, and the length of the bottom of the drainage box (51) matches the length of the filter part (271).

7. A method for treating heavy metal wastewater, applied to a device for treating heavy metal wastewater according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1, injecting the heavy metal wastewater to be treated and the reagent that reacts with the heavy metal ions into the reaction cylinder (1) through the wastewater inlet (101) and the reagent inlet (102); S2, driving the hollow rotating shaft (2) to rotate by a motor, so that the stirring plate (21) and the auxiliary plate (4) rotate synchronously to fully mix and stir the heavy metal wastewater and the reaction reagent, thereby promoting the reaction of heavy metal ions to form solid particles; S3, extending the telescopic end of the electric telescopic rod (33) and driving the sealing plate (3) to move, so that the adapter (31) on the sealing plate (3) is aligned with the water inlet (22) on the stirring plate (21). At this time, the stirring plate (21) rotates to capture part of the wastewater, so that the wastewater enters the stirring plate (21) from the water inlet (22) and passes through the hollow rotating shaft (2) to be discharged from the bottom end thereof; S4, filtering the wastewater discharged from the bottom of the hollow rotating shaft (2) through the inclined filter plate (27), so that the filtered wastewater falls into the water collecting tank (25), and the filtered solid particles fall into the collection box (211) in the waste collecting tank (26); S5, the waste water in the water collection tank (25) is pumped by the circulation pump (28) and the water suction pipe (29), and is transported to the reaction cylinder (1) through the water supply pipe (210); S6. After the heavy metals in the wastewater are removed, the control valve (104) is opened so that the drain pipe (103) is opened to discharge the wastewater.

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