Zinc-containing wastewater treatment and recycling device for electroplating production line

Abstract

The invention relates to the technical field of water pollution treatment, in particular to a device for treating and recycling zinc-containing wastewater of an electroplating production line. Comprising a shell, the shell is provided with a water inlet part and a first drainage part, a precipitation shell and a filter are installed in the shell, precipitation cavities distributed at intervals are formed in the precipitation shell, the adjacent precipitation cavities are communicated through a connecting channel, the precipitation shell divides the inner space of the shell into a first cavity and a second cavity, and the filter is located in the second cavity. And the first chamber and the second chamber are respectively communicated with the adjacent precipitation chambers through connecting channels. The precipitation chamber provides a chemical precipitation space for the zinc-containing wastewater to reduce the zinc content and the precipitate content in the wastewater, and the filter is combined to perform membrane separation treatment on the wastewater and perform deep purification on impurities in the wastewater, so that the wastewater reaches the recovery standard, the probability that the precipitate blocks the filter is reduced, and the recovery rate of the wastewater is improved. Further, the wastewater treatment effect is improved.

Description

Technical Field

[0001] This invention relates to the field of water pollution treatment technology, and more specifically, to a device for treating and recycling zinc-containing wastewater from an electroplating production line. Background Technology

[0002] The electroplating industry is a major source of industrial wastewater, especially zinc-containing wastewater. Zinc ions in zinc-containing wastewater are heavy metal pollutants. Therefore, effective treatment of zinc-containing electroplating wastewater and the recycling of water resources are key to achieving green production and sustainable development. Currently, there are two main methods for treating zinc-containing wastewater: chemical precipitation (such as adding alkali to generate zinc hydroxide precipitate) and membrane separation technology. Chemical precipitation can convert most of the zinc ions in the wastewater into insoluble precipitates, thereby reducing the heavy metal content in the wastewater. However, the wastewater treated by chemical precipitation still contains a large amount of soluble salts, making it impossible to directly recycle the wastewater. While membrane separation technology (such as microfiltration and ultrafiltration) can treat zinc-containing wastewater to the standard of reuse, membrane separation technology is easily clogged by impurities during wastewater treatment, leading to a sharp drop in membrane flux, i.e., serious membrane fouling and clogging problems, which in turn affect the wastewater treatment effect and efficiency. Summary of the Invention

[0003] In order to overcome the shortcomings mentioned in the background art, the present invention provides a device for treating and recycling zinc-containing wastewater from an electroplating production line.

[0004] The technical implementation of the present invention is as follows: a zinc-containing wastewater treatment and recycling device for an electroplating production line, comprising a shell, wherein the shell is provided with a water inlet and a first drainage section, a sedimentation shell and a filter are installed inside the shell, the sedimentation shell is provided with sedimentation chambers spaced apart, adjacent sedimentation chambers are connected by connecting channels, the sedimentation shell divides the internal space of the shell into a first chamber and a second chamber, the filter is located in the second chamber, the first chamber and the second chamber are respectively connected to the adjacent sedimentation chambers by connecting channels, and the second chamber is connected to the first drainage section.

[0005] More preferably, the shell is rotatably and slidably connected to a number of connecting shafts equal to the number of sedimentation chambers, and the connecting shafts are fixedly connected to a plurality of rotating disks spaced apart, and the rotating disks are fixedly connected to a plurality of circumferentially evenly distributed adhesive fibers.

[0006] More preferably, the sedimentation chamber is fixed with the same number of cleaning rings as the rotating disks. The cleaning rings are used to clean all the lint on the adjacent rotating disks. Each cleaning ring has several flexible rings arranged at intervals, and the flexible rings are used to clean all the lint on the corresponding cleaning ring.

[0007] More preferably, the inner diameter of all the flexible rings on the same cleaning ring gradually decreases from bottom to top.

[0008] More preferably, the housing is fixedly connected to an electric push rod, the telescopic part of the electric push rod is fixedly connected to a connecting frame, the connecting shaft is rotatably connected to the connecting frame, the housing is fixedly connected to a number of fixed cylinders the same as the connecting shaft, the fixed cylinders are provided with arc-shaped grooves, and the connecting shaft is fixedly connected to a fixing pin that slides in adjacent arc-shaped grooves.

[0009] More preferably, a connecting pipe is provided in the sedimentation chamber, and a buffer plate is fixedly connected to one end of the connecting pipe. The buffer plate is located below the adjacent rotating plate. The first chamber is connected to the adjacent sedimentation chamber through an adjacent connecting channel and an adjacent connecting pipe. The two adjacent sedimentation chambers are connected to each other through an adjacent connecting channel and an adjacent connecting pipe.

[0010] More preferably, the buffer disk is frustum-shaped, the diameter of the buffer disk gradually increases from top to bottom, and one end of the buffer disk on the connecting pipe is flush with the upper side of the buffer disk.

[0011] More preferably, the shell is fixedly connected to a feed pipe, the feed pipe is connected to a distribution ring with the same number as the sedimentation chambers, the distribution ring is connected to a plurality of distribution pipes that are circumferentially evenly distributed and all connected to the adjacent sedimentation chambers, and the distribution pipes are located at the lower part of the adjacent sedimentation chambers.

[0012] More preferably, the inner diameter of the distribution pipe of all the distribution rings decreases sequentially from the point closer to the water inlet to the point farther away from the water inlet.

[0013] More preferably, the housing is equipped with a motor, the output shaft of the motor is driven to the filter via a transmission component, the filter is rotatably and sealed to the housing, the filter is provided with symmetrically distributed filter membranes, a partition is provided on the side of the filter near the sedimentation shell, the partition is sealed and fitted to the sedimentation shell, the housing is provided with symmetrically distributed second drainage sections, the second drainage sections are connected to the second chamber, the symmetrically distributed second drainage sections are respectively located on both sides of the partition, and the symmetrically distributed filter membranes are respectively located on both sides of the partition.

[0014] The beneficial effects of this invention are as follows: This invention provides a chemical precipitation space for zinc-containing wastewater through a sedimentation chamber, thereby reducing the zinc content and precipitate content in the wastewater. Combined with membrane separation treatment using a filter, the wastewater undergoes deep purification of impurities, meeting recycling standards while reducing the probability of precipitate clogging the filter, thus improving wastewater treatment efficiency. Adhesive fibers are used to adhere to light flocculent matter, reducing the probability of clogging the filter. Then, the adhesive fibers and cleaning rings are periodically subjected to relative displacement and rotation, with multiple flexible rings gradually cleaning the light flocculent matter on the adhesive fibers. Layer scraping increases the settling rate of sediments in wastewater, reducing the probability of light flocculents and sediments being carried into the filter and causing clogging. During wastewater treatment, a buffer plate guides and buffers the wastewater, allowing it to flow slowly into the settling chamber, reducing the impact force of the wastewater on the sediments at the bottom of the chamber and thus improving the settling effect. The treated wastewater is then used to alternately backwash the two filter membrane modules, reducing the frequency of disassembly and cleaning of the membrane modules without affecting normal wastewater treatment, thereby improving wastewater treatment efficiency. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a three-dimensional structural cross-sectional view of the housing of the present invention; Figure 3 This is a three-dimensional structural cross-sectional view of the sedimentation shell of the present invention; Figure 4 This is a three-dimensional structural diagram of the cleaning ring of the present invention; Figure 5 This is a three-dimensional structural diagram of the buffer disk of the present invention; Figure 6 This is a three-dimensional structural diagram of the arc-shaped groove and fixing pin of the present invention; Figure 7 This is a three-dimensional structural diagram of the partition of the present invention.

[0016] The markings in the attached diagram are as follows: 1. Shell, 101. Water inlet, 102. First drain, 103. Second drain, 104. First chamber, 105. Second chamber, 2. Sedimentation shell, 201. Sedimentation chamber, 3. Filter, 4. Connecting shaft, 5. Rotating disc, 6. Lint remover, 7. Cleaning ring, 8. Flexible ring, 9. Electric push rod, 10. Connecting frame, 11. Fixed cylinder, 12. Arc groove, 13. Fixed pin, 14. Connecting pipe, 15. Buffer disc, 16. Feed pipe, 17. Distributing ring, 18. Distributing pipe, 19. Motor, 20. Filter membrane assembly, 21. Separator. Detailed Implementation

[0017] The invention will now be described more fully below with reference to the accompanying drawings, in which presently preferred embodiments of the invention are illustrated. However, the invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness and to fully convey the scope of the invention to those skilled in the art.

[0018] Example 1 A device for treating and recycling zinc-containing wastewater from an electroplating production line, such as... Figures 1-3 As shown, the device includes a housing 1. The lower part of the housing 1 has several slag discharge ports. These ports are opened periodically to discharge sediment generated during wastewater treatment. The left and right sides of the housing 1 are respectively provided with a water inlet 101 and a first drainage outlet 102. Initially, the water inlet 101 and the first drainage outlet 102 are closed. When the device is needed, the water inlet 101 and the first drainage outlet 102 are opened. A sedimentation shell 2 and a filter 3 are installed inside the housing 1. In this embodiment, the filter 3 is fixedly connected to the housing 1. In this embodiment, the filter 3 can be an existing membrane separation filtration structure. In this embodiment, the reagent can be directly added to the wastewater through the water inlet 101. The sedimentation shell 2 has spaced sedimentation chambers 201. Adjacent sedimentation chambers 201 are connected by connecting channels. The sedimentation shell 2 divides the internal space of the housing 1 into two parts: a first chamber 104 and a second chamber 105. The filter 3 is located in the second chamber 105. The first chamber 104 and the second chamber 105 are respectively connected by connecting channels. The water inlet 101 is connected to the adjacent sedimentation chamber 201. Water flows into the first chamber 104 from the inlet 101 and into the adjacent sedimentation chamber 201. Then, the water flows into all the sedimentation chambers 201 in sequence. The water undergoes chemical sedimentation in the sedimentation chambers 201. The supernatant after sedimentation enters the first drainage section 102 through the second chamber 105 and its internal filter 3. Finally, the treated wastewater is discharged through the first drainage section 102. The sedimentation chambers 201 provide a chemical sedimentation space for zinc-containing wastewater to reduce the zinc content and the content of precipitated substances in the wastewater. Several slag discharge ports of the shell 1 are located at the bottom of all the sedimentation chambers 201 and the bottom of the inlet 101, respectively, to regularly clean the sediment in all the sedimentation chambers 201 and the shell 1. Combined with the filter 3, the wastewater is subjected to membrane separation treatment to deeply purify the impurities in the wastewater, so that the wastewater meets the recycling standards while reducing the probability of precipitated substances clogging the filter 3, thereby improving the wastewater treatment effect. The second chamber 105 is connected to the first drainage section 102.

[0019] like Figures 3-5As shown, the shell 1 is rotatably and slidably connected to a number of connecting shafts 4, the same as the sedimentation chamber 201. Several rotating disks 5 are fixedly connected to the lower part of the connecting shafts 4 at intervals. Several sticky hairs 6 are fixedly connected to the rotating disks 5 and evenly distributed in the circumference. The sticky hairs 6 are used to adhere to the zinc hydroxide precipitate (chemical precipitation is achieved by adding alkali to make zinc ions form zinc hydroxide precipitate that is insoluble in water), reducing the probability that the precipitate will be carried into the filter 3 by the wastewater and cause blockage of the filter 3.

[0020] like Figures 3-5 As shown, the same number of cleaning rings 7 as the rotating disk 5 are fixed in the sedimentation chamber 201. When a large amount of light flocculent material (in the early stage of zinc hydroxide formation, it exists in the form of extremely fine colloidal particles and loose flocculent material) adheres to the sticky hairs 6, the rotating disk 5 is moved by the connecting shaft 4. The sticky hairs 6 and the cleaning rings 7 are relatively displaced. The cleaning rings 7 clean all the sticky hairs 6 on the adjacent rotating disks 5, scraping off the light flocculent material on the sticky hairs 6, increasing the sedimentation rate of the precipitate in the wastewater, and reducing the probability of the light flocculent material being carried into the filter 3 by the wastewater and causing blockage of the filter 3. Several flexible rings 8 are arranged vertically and horizontally inside the cleaning ring 7. The flexible rings 8 are used to clean all the sticky hairs 6 on the corresponding cleaning ring 7. The inner diameter of all the flexible rings 8 on the same cleaning ring 7 gradually decreases from bottom to top. Through all the flexible rings 8, the precipitate on the sticky hairs 6 is scraped off layer by layer.

[0021] like Figures 4-6 As shown, housing 1 is equipped with a control terminal (not shown in the figure). Housing 1 is fixedly connected to an electric push rod 9 that is electrically connected to the control terminal. The telescopic part of the electric push rod 9 is fixedly connected to a connecting frame 10. The telescopic part of the electric push rod 9 is used to drive the connecting frame 10 to move up and down reciprocally. The connecting shaft 4 is rotatably connected to the connecting frame 10. Housing 1 is fixedly connected to a fixed cylinder 11 with the same number as the connecting shaft 4. The fixed cylinder 11 is provided with an arc-shaped groove 12. The connecting shaft 4 is fixedly connected to a fixing pin 13 that slides in the adjacent arc-shaped groove 12. During the up and down reciprocating movement of the connecting frame 10, the connecting frame 10 drives the fixing pin 13 to move up and down reciprocally through the connecting shaft 4. The fixing pin 13 moves along the arc-shaped groove 12. Initially, the fixing pin 13 is located at the lower end of the arc-shaped groove 12, and the lint 6 is located below the corresponding cleaning ring 7. During the upward movement of the fixing pin 13 driven by the connecting shaft 4, the fixing pin 13 moves along the arc-shaped groove 12, causing the fixing pin 13 to drive the connecting shaft 4 to rotate.

[0022] The specific working principle is as follows: When operators need to use this device to treat zinc-containing wastewater generated during electroplating production, they open the inlet 101 and the first outlet 102, injecting the zinc-containing wastewater and reagent into the inlet 101. The zinc-containing wastewater and reagent react to form zinc hydroxide precipitate. The water flows from the inlet 101 into the first chamber 104 and then into the adjacent sedimentation chamber 201. The water then flows sequentially into all sedimentation chambers 201, where chemical precipitation occurs. The supernatant after precipitation passes through the second chamber 105 and its... The internal filter 3 enters the first drainage section 102, and finally discharges the treated wastewater through the first drainage section 102. The wastewater passes through the sedimentation chamber 201, which provides a chemical sedimentation space for the zinc-containing wastewater to reduce the zinc content and sediment content in the wastewater. Combined with the membrane separation treatment of the filter 3, the wastewater is deeply purified to remove impurities, so that the wastewater meets the recycling standards. At the same time, the probability of sediment clogging the filter 3 is reduced, thereby improving the wastewater treatment effect. After the wastewater is treated, the operator will recycle and reuse the wastewater.

[0023] When wastewater flows into sedimentation chamber 201, it first enters the bottom of the left sedimentation chamber 201. The water flows upward in the sedimentation chamber 201 and passes through all the rotating disks 5 in sequence. A large amount of precipitate generated in the wastewater adheres to the adhesive fibers 6. When the wastewater flows to the upper part of the sedimentation chamber 201, it flows to the bottom of the next sedimentation chamber 201. The above steps are repeated. The adhesive fibers 6 block and adsorb the light flocculent matter generated in the wastewater (in the early stage of zinc hydroxide formation, it exists in the form of extremely fine colloidal particles and loose flocculent matter).

[0024] During the wastewater treatment process, the electric push rod 9 is periodically activated by the control terminal. The telescopic part of the electric push rod 9 drives the connecting frame 10 to move up and down reciprocally. During the up and down reciprocating movement of the connecting frame 10, the connecting frame 10 drives the fixing pin 13 to move up and down reciprocally via the connecting shaft 4. The fixing pin 13 moves along the arc groove 12. Initially, the fixing pin 13 is located at the lower end of the arc groove 12, and the lint 6 is located below the corresponding cleaning ring 7. During the upward movement of the connecting shaft 4, the fixing pin 13 moves along the arc groove 12, causing the fixing pin 13 to drive the connecting shaft 4 to rotate. The connecting shaft 4 is periodically rotated back and forth during the up and down movement, and the connecting shaft 4 and the connecting frame 10 rotate relative to each other.

[0025] During the up-and-down movement and reciprocating rotation of the connecting shaft 4, the connecting shaft 4 drives the sticky hair 6 to move through the rotating disk 5. The sticky hair 6 moves relative to the flexible ring 8 on the cleaning ring 7. The flexible ring 8 periodically scrapes off the light flocculent material on the sticky hair 6, increasing the sedimentation rate of the sediment in the wastewater, while reducing the probability that the sediment will be carried into the filter 3 by the wastewater and cause blockage of the filter 3.

[0026] After the treated wastewater is discharged through the first drainage section 102, the operator closes the water inlet section 101 and the first drainage section 102 and cleans the device for the next use.

[0027] Example 2 Based on Example 1, such as Figures 3-5 As shown, a connecting pipe 14 is provided in the sedimentation chamber 201. A buffer plate 15 is fixed to the upper end of the connecting pipe 14. The buffer plate 15 is located below the adjacent rotating plate 5. The buffer plate 15 is frustum-shaped and its diameter gradually increases from top to bottom. The upper side of the connecting pipe 14 is flush with the upper side of the buffer plate 15. Water flows through the connecting pipe 14 to the buffer plate 15 and enters the sedimentation chamber 201. The buffer plate 15 guides and buffers the wastewater, allowing the wastewater to flow slowly into the sedimentation chamber 201, reducing the impact force of the wastewater on the sediment at the bottom of the sedimentation chamber 201, thereby improving the sedimentation effect of the sediment in the wastewater. The first chamber 104 is connected to the adjacent sedimentation chamber 201 through the adjacent connecting channel and the adjacent connecting pipe 14. The two adjacent sedimentation chambers 201 are connected to each other through the adjacent connecting channel and the adjacent connecting pipe 14.

[0028] Example 3 Based on Example 2, such as Figure 3 and Figure 4 As shown, the housing 1 is fixedly connected to a feed pipe 16. In the above embodiment, the reagent is directly added to the wastewater. In this embodiment, the feed pipe 16 is used to inject the reagent (such as calcium hydroxide aqueous solution or sodium hydroxide aqueous solution). The feed pipe 16 is connected to a distribution ring 17, the same number as the sedimentation chambers 201. The distribution ring 17 is connected to a plurality of distribution pipes 18 that are circumferentially evenly distributed and connected to adjacent sedimentation chambers 201. The distribution pipes 18 are located at the lower part of adjacent sedimentation chambers 201. During the wastewater treatment process... The reagent is injected into the distribution pipe 18 through the feed pipe 16 and the distribution ring 17. The distribution pipe 18 is used to add the reagent to the lower part of the sedimentation chamber 201 so that the reagent can be mixed with the wastewater discharged from the connecting pipe 14. The inner diameter of the distribution pipe 18 of all the distribution rings 17 decreases from left to right. The wastewater flows from left to right. After reaction and sedimentation, the zinc content in the wastewater gradually decreases. The amount of reagent discharged from the distribution pipe 18 on the right side of the distribution ring 17 decreases simultaneously to reduce the probability of excessive reagent in the wastewater and ensure the wastewater treatment effect.

[0029] Example 4 Based on Example 3, such as Figure 3 and Figure 7As shown, in the above embodiment, the filter 3 can be an existing membrane separation filtration structure. In this embodiment, the following structure is adopted: the housing 1 is equipped with a motor 19 electrically connected to the control terminal. The output shaft of the motor 19 is driven to the filter 3 through a transmission component. The transmission component includes a spur gear and an arc rack. The spur gear is fixedly connected to the output shaft of the motor 19, and the arc rack is fixedly connected to the filter 3. In the above embodiment, the filter 3 is fixedly connected to the housing 1. In this embodiment, the filter 3 is sealed and rotatably connected to the housing 1. The filter 3 is provided with two symmetrically distributed filter membrane groups 20. The left side of the filter 3 is provided with a partition 21 that is sealed and fitted to the sedimentation shell 2. The housing 1 is provided with two symmetrically distributed second drainage sections 103. The second drainage sections 103 are connected to the second chamber 105. The symmetrically distributed second drainage sections 103 are located on the front and rear sides of the partition 21, respectively. The symmetrically distributed filter membrane groups 20 are located on the front and rear sides of the partition 21, respectively. When using this device to treat wastewater... During the process, initially, drainage section 103 and the first drainage section 102 are closed. The wastewater treated by sedimentation flows to the right through the front filter membrane assembly 20 to the first drainage section 102. The operator opens the first drainage section 102 to recover the wastewater discharged from the second drainage section 103. If the rear filter membrane assembly 20 becomes clogged, the second drainage section 103 is closed, and the treated wastewater flows back to the rear filter membrane assembly 20 for backwashing. The operator then opens the rear drainage section 103. After the treated wastewater is rinsed, the rear filter membrane group 20 is discharged through the rear second drainage section 103. If the front filter membrane group 20 is blocked, the motor 19 is turned on through the control terminal. The output shaft of the motor 19 drives the filter 3 to rotate through the transmission component, so that the wastewater no longer enters the front filter membrane group 20. The wastewater flows through the rear filter membrane group 20 to the first drainage section 102. This process is repeated to continuously and automatically rinse the filter membrane group 20, reducing the frequency of disassembly and cleaning of the filter membrane group 20 and improving the wastewater treatment efficiency.

[0030] Those skilled in the art should understand that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A device for treating and recycling zinc-containing wastewater from an electroplating production line, characterized in that, The utility model provides a water purifier, including shell (1), the shell (1) is provided with water inlet portion (101) and first drainage portion (102), the shell (1) installs the sediment shell (2) and filter (3) inside, the sediment shell (2) is provided with the interval distribution sediment chamber (201), and the adjacent sediment chamber (201) is communicated through connecting channel, the sediment shell (2) divides the shell (1) inside space into first chamber (104) and second chamber (105) two parts, the filter (3) is located in the second chamber (105), and the first chamber (104) and the second chamber (105) are communicated with adjacent sediment chamber (201) through connecting channel respectively, and the second chamber (105) is communicated with the first drainage portion (102).

2. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 1, characterized in that, The shell (1) is rotatably and slidably connected with a plurality of connecting shafts (4) which are equal in number to the sediment chambers (201), the connecting shafts (4) are fixedly connected with a plurality of rotating discs (5) which are spaced apart, and the rotating discs (5) are fixedly connected with a plurality of sticky hairs (6) which are uniformly distributed in a circumferential direction.

3. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 2, characterized in that, The sediment chamber (201) is fixedly connected with a plurality of cleaning rings (7) which are equal in number to the rotating discs (5), the cleaning rings (7) are used for cleaning all the sticky hairs (6) on the adjacent rotating discs (5), and the cleaning rings (7) are provided with a plurality of flexible rings (8) which are spaced apart from top to bottom, and the flexible rings (8) are used for cleaning all the sticky hairs (6) on the corresponding cleaning rings (7).

4. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 3, characterized in that, The inner diameters of all the flexible rings (8) on the same cleaning ring (7) gradually decrease from bottom to top.

5. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 4, characterized in that, The shell (1) is fixedly connected with an electric push rod (9), the telescopic part of the electric push rod (9) is fixedly connected with a connecting frame (10), the connecting shafts (4) are rotatably connected with the connecting frame (10), the shell (1) is fixedly connected with a plurality of fixing cylinders (11) which are equal in number to the connecting shafts (4), the fixing cylinders (11) are provided with arc-shaped grooves (12) therein, and the connecting shafts (4) are fixedly connected with fixing pins (13) which slide in the adjacent arc-shaped grooves (12).

6. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 1, characterized in that, The sediment chamber (201) is provided with a connecting pipe (14), one end of the connecting pipe (14) is fixedly connected with a buffer disc (15), the buffer disc (15) is located below the adjacent rotating disc (5), the first chamber (104) is communicated with the adjacent sediment chambers (201) through the adjacent connecting channels and the adjacent connecting pipes (14), and the adjacent two sediment chambers (201) are communicated through the adjacent connecting channels and the adjacent connecting pipes (14).

7. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 6, characterized in that, The buffer disc (15) is a circular truncated cone, the diameter of the buffer disc (15) gradually increases from top to bottom, and one end of the buffer disc (15) on the connecting pipe (14) is flush with the upper side of the buffer disc (15).

8. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 1, characterized in that, The shell (1) is fixed with a feeding pipe (16), the feeding pipe (16) is communicated with the same number of distribution rings (17) as the sedimentation chambers (201), the distribution rings (17) are communicated with a plurality of distribution pipes (18) which are uniformly distributed in the circumference and are all communicated with adjacent sedimentation chambers (201), and the distribution pipes (18) are located at the lower part of the adjacent sedimentation chambers (201).

9. The apparatus for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 8, characterized in that, The inner diameters of the distribution pipes (18) of all the distribution rings (17) are sequentially reduced from the part close to the water inlet part (101) to the part far from the water inlet part (101).

10. The device for treating and recycling zinc-containing wastewater of an electroplating production line according to claim 1, characterized in that, The shell (1) is provided with a motor (19), the output shaft of the motor (19) is driven by a transmission member, the filter (3) is sealingly and rotatably connected with the shell (1), the filter (3) is provided with symmetrically distributed filter membrane groups (20), the filter (3) is provided with a separation part (21) on the side close to the sedimentation shell (2), the separation part (21) is sealingly and closely combined with the sedimentation shell (2), the shell (1) is provided with symmetrically distributed second water discharge parts (103), the second water discharge parts (103) are communicated with the second chambers (105), and the symmetrically distributed second water discharge parts (103) are respectively located on the two sides of the separation part (21), and the symmetrically distributed filter membrane groups (20) are respectively located on the two sides of the separation part (21).

Images