Selective adsorption and recovery device for heavy metal ions in surface treatment wastewater

Abstract

The invention relates to the technical field of wastewater heavy metal ion treatment, and discloses a surface treatment wastewater heavy metal ion selective adsorption and recovery device which comprises a first adsorption column, a second adsorption column, a waste liquid inlet pipe and a liquid discharge pipe. The top end of the first input pipeline is fixedly connected to the bottom of the waste liquid inlet pipe, a first electromagnetic valve is arranged on one side of the first input pipeline, a second input pipeline is fixedly connected to the top end of the second adsorption column, and the top end of the second input pipeline is fixedly connected to the bottom of the waste liquid inlet pipe. In the invention, when the adsorption material in the adsorption column gradually reaches a saturated state, the pressure in the first adsorption column is gradually increased, the piston is pushed to move upwards, the first electrode block is driven to move upwards to be in contact with the second electrode block, and the warning lamp is electrified and brightened, which indicates that the adsorption material in the first adsorption column reaches the saturated state and loses the adsorption capacity; the adsorption column needs to be subjected to acid pickling treatment.

Description

Technical Field

[0001] This invention relates to the field of wastewater heavy metal ion treatment technology, and in particular to a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater. Background Technology

[0002] In industrial production, surface treatment processes such as electroplating, electroless plating, and anodizing generate a large amount of wastewater containing heavy metal ions. If these heavy metal ions are discharged directly without effective treatment, they will cause serious pollution to the environment, harm the ecosystem and human health. Therefore, it is necessary to adsorb and remove heavy metal ions from the wastewater.

[0003] Existing wastewater heavy metal ion adsorption devices cannot monitor the saturation state of the adsorption material in the adsorption column in real time. This makes it difficult for operators to know in a timely manner whether the adsorption material has reached saturation and lost its adsorption capacity, resulting in a decrease in treatment effect or even failure to meet wastewater treatment standards. Summary of the Invention

[0004] To overcome the above shortcomings, this invention provides a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater. It aims to improve existing wastewater heavy metal ion adsorption devices, which cannot monitor the saturation state of the adsorption material in the adsorption column in real time. This makes it difficult for operators to know in a timely manner whether the adsorption material has reached saturation and lost its adsorption capacity, resulting in a decrease in treatment effect or even failure to meet wastewater treatment standards.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater, comprising a first adsorption column, a second adsorption column, a waste liquid inlet pipe, and a drain pipe. A first input pipe is fixedly connected to the top of the first adsorption column, and the top of the first input pipe is fixedly connected to the bottom of the waste liquid inlet pipe. A first solenoid valve is provided on one side of the first input pipe. A second input pipe is fixedly connected to the top of the second adsorption column, and the top of the second input pipe is fixedly connected to the bottom of the waste liquid inlet pipe. A second solenoid valve is provided on one side of the second input pipe. Adsorption material is disposed inside both the first and second adsorption columns. A pressure monitoring structure, comprising a hollow tube, is provided at the top of both the first and second input pipes. A sleeve is fixedly connected to the top of the hollow tube.

[0006] By adopting the above technical solution, after the first adsorption column has been used for a period of time, the adsorption material will gradually reach a saturated state, the pressure inside the first adsorption column will gradually increase, pushing the piston upward. The piston drives the movable rod, the anti-detachment cap and the first electrode block to move upward until the first electrode block moves up to contact the second electrode block. When the warning light is turned on and becomes bright, it indicates that the adsorption material inside the first adsorption column has reached a saturated state and lost its adsorption capacity. The adsorption column needs to be acid-washed and the second adsorption column needs to be replaced to adsorb and remove heavy metal ions.

[0007] After being regenerated by acid washing, the adsorbent material regains its adsorption capacity and can continue to be used to treat surface treatment wastewater. At the same time, the waste liquid generated during the acid washing process can be treated and its useful components can be recycled, realizing the recycling of resources.

[0008] Preferably, a piston is provided inside the sleeve, a movable rod is fixedly connected to the top of the piston, an anti-detachment cap is fixedly connected to the top of the movable rod, a spring is provided between the bottom of the anti-detachment cap and the top of the sleeve, a first electrode block is installed on the top of the anti-detachment cap, a fixing frame is fixedly connected to the top of the sleeve, a threaded hole is opened on the top of the fixing frame, and a threaded rod is threadedly connected to the threaded hole of the fixing frame.

[0009] Preferably, a rotating cap is fixedly connected to the top end of the threaded rod, a fixed disc is fixedly connected to the bottom end of the threaded rod, a second electrode block is installed at the bottom of the fixed disc, a warning light is provided on one side of the fixing frame, and the warning light, the second electrode block and the first electrode block are electrically connected.

[0010] Preferably, the bottom end of the first adsorption column is fixedly connected to a first discharge pipe, the bottom end of the first discharge pipe is fixedly connected to the top of the discharge pipe, and a third solenoid valve is provided on one side of the first discharge pipe; the bottom end of the second adsorption column is fixedly connected to a second discharge pipe, the bottom end of the second discharge pipe is fixedly connected to the top of the discharge pipe, and a fourth solenoid valve is provided on one side of the second discharge pipe.

[0011] Preferably, a first heavy metal detector is installed at the top of the first discharge pipe, and a second heavy metal detector is installed at the top of the second discharge pipe.

[0012] Preferably, a first acidic solution inlet pipe is fixedly connected to the bottom end of the first adsorption column, a fifth solenoid valve is provided on one side of the first acidic solution inlet pipe, a first discharge pipe is fixedly connected to the top end of the first adsorption column, and a sixth solenoid valve is provided on one side of the first discharge pipe.

[0013] Preferably, a second acidic solution inlet pipe is fixedly connected to the bottom end of the second adsorption column, a seventh solenoid valve is provided on one side of the second acidic solution inlet pipe, a second discharge pipe is fixedly connected to the top end of the second adsorption column, and an eighth solenoid valve is provided on one side of the second discharge pipe.

[0014] Preferably, a first inlet pipe is fixedly connected to one side of the first input pipe, and a ninth solenoid valve is provided on one side of the first inlet pipe; a second inlet pipe is fixedly connected to one side of the second input pipe, and a tenth solenoid valve is provided on one side of the second inlet pipe.

[0015] The present invention has the following beneficial effects:

[0016] 1. In this invention, after the first adsorption column has been used for a period of time, the adsorption material will gradually reach a saturated state, and the pressure inside the first adsorption column will gradually increase, pushing the piston upward. The piston drives the movable rod, the anti-detachment cap and the first electrode block to move upward until the first electrode block moves upward to contact the second electrode block. When the warning light is turned on and becomes bright, it indicates that the adsorption material inside the first adsorption column has reached a saturated state and lost its adsorption capacity. The adsorption column needs to be acid-washed and the second adsorption column needs to be replaced to adsorb and remove heavy metal ions.

[0017] 2. In this invention, when acid washing the heavy metal ions on the surface of the adsorbent material in the first adsorption column, the fifth solenoid valve is opened, and acid washing solution is injected into the first adsorption column through the first acid solution inlet pipe to acid wash and regenerate the adsorbent material. The waste liquid generated during the acid washing process is discharged through the first discharge pipe. After acid washing and regeneration, the adsorbent material restores its adsorption capacity and can continue to be used to treat surface treatment wastewater. At the same time, the waste liquid generated during the acid washing process can be treated and recycled to recover the useful components, thereby realizing the recycling of resources.

[0018] 3. In this invention, by setting a first heavy metal detector and a second heavy metal detector at the top of the first and second discharge pipes respectively, the content of heavy metal ions in the solution after being treated by their respective adsorption columns can be accurately detected. This quantitative detection method is more accurate and reliable than traditional subjective judgment or sampling detection, and helps to understand the adsorption effect of the adsorption material in a timely manner. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater proposed in this invention.

[0020] Figure 2 This is a partial structural diagram of the first adsorption column of a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater proposed in this invention.

[0021] Figure 3This is a schematic diagram of the pressure monitoring structure of a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater proposed in this invention.

[0022] Figure 4 This is a partial structural diagram of the sleeve 6 of a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater proposed in this invention.

[0023] Legend:

[0024] 1. First adsorption column; 101. First input pipe; 102. First solenoid valve; 103. First discharge pipe; 104. Third solenoid valve; 105. First acidic solution inlet pipe; 106. Fifth solenoid valve; 107. First discharge pipe; 108. Sixth solenoid valve; 109. First inlet pipe; 110. Ninth solenoid valve; 2. Second adsorption column; 201. Second input pipe; 202. Second solenoid valve; 203. Second discharge pipe; 204. Fourth solenoid valve; 205. Second acidic solution inlet pipe ; 206. Seventh solenoid valve; 207. Second discharge pipe; 208. Eighth solenoid valve; 209. Second inlet pipe; 210. Tenth solenoid valve; 3. Waste liquid inlet pipe; 4. Discharge pipe; 5. Hollow pipe; 6. Sleeve; 7. Piston; 8. Movable rod; 9. Anti-detachment cap; 10. First electrode block; 11. Spring; 12. Fixing bracket; 13. Threaded rod; 14. Rotating cap; 15. Fixing disc; 16. Second electrode block; 17. Warning light; 18. First heavy metal detector; 19. Second heavy metal detector. Detailed Implementation

[0025] The technical solutions in 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 some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Reference Figures 1-4An embodiment of the present invention provides a selective adsorption and recovery device for heavy metal ions in surface treatment wastewater, comprising a first adsorption column 1, a second adsorption column 2, a waste liquid inlet pipe 3, and a drain pipe 4. A first input pipe 101 is fixedly connected to the top of the first adsorption column 1, and the top of the first input pipe 101 is fixedly connected to the bottom of the waste liquid inlet pipe 3. A first solenoid valve 102 is provided on one side of the first input pipe 101. A second input pipe 201 is fixedly connected to the top of the second adsorption column 2, and the top of the second input pipe 201 is fixedly connected to the bottom of the waste liquid inlet pipe 3. A second solenoid valve 202 is provided on one side of the second input pipe 201. Adsorption material is disposed inside both the first adsorption column 1 and the second adsorption column 2. A pressure monitoring structure, comprising a hollow tube 5, is provided at the top of both the first input pipe 101 and the second input pipe 201. A sleeve 6 is fixedly connected to the top of the hollow tube 5.

[0027] Specifically, after the first adsorption column 1 has been used for a period of time, the adsorption material will gradually reach saturation, and the pressure inside the first adsorption column 1 will gradually increase, pushing the piston 7 to move upward. The piston 7 drives the movable rod 8, the anti-detachment cap 9, and the first electrode block 10 to move upward until the first electrode block 10 moves upward to contact the second electrode block 16. When the warning light 17 is powered on and becomes bright, it indicates that the adsorption material inside the first adsorption column 1 has reached saturation and lost its adsorption capacity. The first adsorption column 1 needs to be acid-washed and the second adsorption column 2 needs to be replaced to adsorb and remove heavy metal ions.

[0028] Close the first solenoid valve 102 and open the second solenoid valve 202, so that the waste liquid flows into the second input pipe 201 through the waste liquid inlet pipe 3, and then flows into the second adsorption column 2. The waste liquid comes into full contact with the adsorption material in the second adsorption column 2. The heavy metal ions are selectively adsorbed by the adsorption material and fixed on its surface. The treated water without heavy metal ions flows into the second discharge pipe 203 and is finally discharged through the drain pipe 4.

[0029] When acid washing the heavy metal ions on the surface of the adsorbent material in the first adsorption column 1, the fifth solenoid valve 106 is opened, and the acid washing solution is injected into the first adsorption column 1 through the first acid solution inlet pipe 105 to acid wash and regenerate the adsorbent material. The waste liquid generated during the acid washing process is discharged through the first discharge pipe 107. After acid washing and regeneration, the adsorbent material restores its adsorption capacity and can continue to be used to treat surface treatment wastewater. At the same time, the waste liquid generated during the acid washing process can be treated and recycled to recover the useful components, realizing the recycling of resources.

[0030] Reference Figures 3-4The sleeve 6 has a piston 7 inside, a movable rod 8 is fixedly connected to the top of the piston 7, an anti-detachment cap 9 is fixedly connected to the top of the movable rod 8, a spring 11 is provided between the bottom of the anti-detachment cap 9 and the top of the sleeve 6, a first electrode block 10 is installed on the top of the anti-detachment cap 9, a fixing frame 12 is fixedly connected to the top of the sleeve 6, a threaded hole is opened on the top of the fixing frame 12, a threaded rod 13 is threadedly connected to the threaded hole of the fixing frame 12, a rotating cap 14 is fixedly connected to the top of the threaded rod 13, a fixing disc 15 is fixedly connected to the bottom of the threaded rod 13, a second electrode block 16 is installed at the bottom of the fixing disc 15, a warning light 17 is provided on one side of the fixing frame 12, and the warning light 17, the second electrode block 16 and the first electrode block 10 are electrically connected.

[0031] Specifically, when the adsorbent material in the first adsorption column 1 gradually reaches saturation, the pressure in the first adsorption column 1 will gradually increase, pushing the piston 7 to move upward. The piston 7 drives the movable rod 8, the anti-detachment cap 9, and the first electrode block 10 to move upward until the first electrode block 10 moves upward to contact the second electrode block 16. At this point, the warning light 17 is powered on and becomes bright, indicating that the adsorbent material in the first adsorption column 1 has reached saturation and lost its adsorption capacity.

[0032] Reference Figure 1 The bottom end of the first adsorption column 1 is fixedly connected to the first discharge pipe 103, and the bottom end of the first discharge pipe 103 is fixedly connected to the top of the discharge pipe 4. A third solenoid valve 104 is provided on one side of the first discharge pipe 103. The bottom end of the second adsorption column 2 is fixedly connected to the second discharge pipe 203, and the bottom end of the second discharge pipe 203 is fixedly connected to the top of the discharge pipe 4. A fourth solenoid valve 204 is provided on one side of the second discharge pipe 203.

[0033] Specifically, the first adsorption column 1 and the second adsorption column 2 are connected to the drain pipe 4 through independent first discharge pipe 103 and second discharge pipe 203, respectively, and each discharge pipe is equipped with a solenoid valve. This design allows the operation of the two adsorption columns to be controlled independently, and the operator can flexibly adjust the timing and flow rate of each adsorption column according to actual needs.

[0034] Reference Figures 1-2 The bottom end of the first adsorption column 1 is fixedly connected to a first acidic solution inlet pipe 105. A fifth solenoid valve 106 is provided on one side of the first acidic solution inlet pipe 105. The top end of the first adsorption column 1 is fixedly connected to a first discharge pipe 107. A sixth solenoid valve 108 is provided on one side of the first discharge pipe 107. The bottom end of the second adsorption column 2 is fixedly connected to a second acidic solution inlet pipe 205. A seventh solenoid valve 206 is provided on one side of the second acidic solution inlet pipe 205. The top end of the second adsorption column 2 is fixedly connected to a second discharge pipe 207. An eighth solenoid valve 208 is provided on one side of the second discharge pipe 207.

[0035] Specifically, when acid washing the heavy metal ions on the surface of the adsorbent material in the first adsorption column 1, the fifth solenoid valve 106 is opened, and acid washing solution is injected into the first adsorption column 1 through the first acid solution inlet pipe 105 to acid wash and regenerate the adsorbent material. The waste liquid generated during the acid washing process is discharged through the first discharge pipe 107. After acid washing and regeneration, the adsorbent material restores its adsorption capacity and can continue to be used to treat surface treatment wastewater.

[0036] When acid washing the heavy metal ions on the surface of the adsorbent material in the second adsorption column 2, the seventh solenoid valve 206 is opened, and the acid washing solution is injected into the second adsorption column 2 through the second acid solution inlet pipe 205 to acid wash and regenerate the adsorbent material. The waste liquid generated during the acid washing process is discharged through the second discharge pipe 207. After acid washing and regeneration, the adsorbent material restores its adsorption capacity and can continue to be used to treat surface treatment wastewater. At the same time, the waste liquid generated during the acid washing process can be treated and recycled to recover the useful components, realizing the recycling of resources.

[0037] Reference Figures 1-2 A first heavy metal detector 18 is installed at the top of the first discharge pipe 103, and a second heavy metal detector 19 is installed at the top of the second discharge pipe 203. A first inlet pipe 109 is fixedly connected to one side of the first input pipe 101, and a ninth solenoid valve 110 is installed on one side of the first inlet pipe 109. A second inlet pipe 209 is fixedly connected to one side of the second input pipe 201, and a tenth solenoid valve 210 is installed on one side of the second inlet pipe 209.

[0038] Specifically, the ninth solenoid valve 110 is opened, allowing the standard amount of heavy metal solution to flow into the first adsorption column 1 through the first inlet pipe 109. After the standard amount of heavy metal solution is adsorbed and removed by the adsorption material in the first adsorption column 1, the treated solution flows into the first discharge pipe 103. The first heavy metal detector 18 can detect the heavy metal ion content in the treated solution. When the heavy metal ion content in the treated solution is very low or non-existent, it indicates that the adsorption effect of the first adsorption column 1 is good. Conversely, the adsorption effect is poor, and the adsorption material in the first adsorption column 1 needs to be acid-washed.

[0039] Open the tenth solenoid valve 210 to allow the standard amount of heavy metal solution to flow into the second adsorption column 2 through the second inlet pipe 209. After the standard amount of heavy metal solution is adsorbed and removed by the adsorption material in the second adsorption column 2, the treated solution flows into the second discharge pipe 203. The heavy metal ion content of the treated solution can be detected by the second heavy metal detector 19. When the heavy metal ion content in the treated solution is very low or non-existent, it indicates that the adsorption effect of the second adsorption column 2 is good. Otherwise, the adsorption effect is poor, and the adsorption material in the second adsorption column 2 needs to be acid-washed. The heavy metal detector is an ICP-MS.

[0040] By installing a first heavy metal detector 18 and a second heavy metal detector 19 at the top of the first delivery pipe 103 and the second delivery pipe 203 respectively, the content of heavy metal ions in the solution after being treated by their respective adsorption columns can be accurately detected. This quantitative detection method is more accurate and reliable than traditional subjective judgment or sampling detection, and helps to understand the adsorption effect of the adsorption material in a timely manner.

[0041] Working principle: First, the first solenoid valve 102 is opened, and the first adsorption column 1 is used to adsorb and remove heavy metal ions. Wastewater flows into the first input pipe 101 through the waste liquid inlet pipe 3, and then into the first adsorption column 1. The waste liquid comes into full contact with the adsorption material in the first adsorption column 1. The heavy metal ions are selectively adsorbed by the adsorption material and fixed on its surface. The treated water free of heavy metal ions flows into the first discharge pipe 103 and is finally discharged through the drain pipe 4.

[0042] After the first adsorption column 1 has been used for a period of time, the adsorption material will gradually reach saturation, and the pressure inside the first adsorption column 1 will gradually increase, pushing the piston 7 to move upward. The piston 7 drives the movable rod 8, the anti-detachment cap 9, and the first electrode block 10 to move upward until the first electrode block 10 moves upward to contact the second electrode block 16. When the warning light 17 is powered on and becomes bright, it indicates that the adsorption material inside the first adsorption column 1 has reached saturation and lost its adsorption capacity. The first adsorption column 1 needs to be acid-washed and the second adsorption column 2 replaced to adsorb and remove heavy metal ions.

[0043] Close the first solenoid valve 102 and open the second solenoid valve 202, so that the waste liquid flows into the second input pipe 201 through the waste liquid inlet pipe 3, and then flows into the second adsorption column 2. The waste liquid comes into full contact with the adsorption material in the second adsorption column 2. The heavy metal ions are selectively adsorbed by the adsorption material and fixed on its surface. The treated water without heavy metal ions flows into the second discharge pipe 203 and is finally discharged through the drain pipe 4.

[0044] When acid washing the surface of the adsorbent material in the first adsorption column 1 with heavy metal ions, the fifth solenoid valve 106 is opened and acid washing solution is injected into the first adsorption column 1 through the first acid solution inlet pipe 105 to acid wash and regenerate the adsorbent material. The waste liquid generated during the acid washing process is discharged through the first discharge pipe 107. After acid washing and regeneration, the adsorbent material restores its adsorption capacity and can continue to be used to treat surface treatment wastewater.

[0045] When the adsorbent material in the second adsorption column 2 reaches saturation and loses its adsorption capacity, it is necessary to acid wash the surface of the adsorbent material in the second adsorption column 2 to remove heavy metal ions. Open the seventh solenoid valve 206 and inject the acid washing solution into the second adsorption column 2 through the second acid inlet pipe 205 to acid wash and regenerate the adsorbent material. The waste liquid generated during the acid washing process is discharged through the second discharge pipe 207. After acid washing and regeneration, the adsorbent material restores its adsorption capacity and can continue to be used to treat surface treatment wastewater.

[0046] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for selective adsorption and recovery of heavy metal ions in surface treatment wastewater, comprising a first adsorption column (1), a second adsorption column (2), a waste liquid inlet pipe (3) and a liquid outlet pipe (4), characterized in that: The top of first adsorption column (1) is fixedly connected with first input pipeline (101), the top of first input pipeline (101) is fixedly connected at the bottom of waste liquid inlet pipe (3), one side of first input pipeline (101) is provided with first electromagnetic valve (102), the top of second adsorption column (2) is fixedly connected with second input pipeline (201), the top of second input pipeline (201) is fixedly connected at the bottom of waste liquid inlet pipe (3), one side of second input pipeline (201) is provided with second electromagnetic valve (202), the inside of first adsorption column (1) and second adsorption column (2) is provided with adsorption material, the top of first input pipeline (101) and second input pipeline (201) is provided with pressure monitoring structure, the pressure monitoring structure includes hollow tube (5), the top of first input pipeline (101) and second input pipeline (201) is fixedly connected with hollow tube (5), the top of hollow tube (5) is fixedly connected with sleeve (6).

2. The selective adsorption and recovery device for heavy metal ions in surface treatment wastewater according to claim 1, characterized in that: The inside of sleeve (6) is provided with piston (7), the top of piston (7) is fixedly connected with movable rod (8), the top of movable rod (8) is fixedly connected with anti-off cap (9), the bottom of anti-off cap (9) and the top of sleeve (6) are provided with spring (11), the top of anti-off cap (9) is installed with first electrode block (10), the top of sleeve (6) is fixedly connected with fixed frame (12), the top of fixed frame (12) is provided with threaded hole, the threaded hole in fixed frame (12) is threadedly connected with threaded rod (13).

3. The selective adsorption and recovery device for heavy metal ions in surface treatment wastewater according to claim 2, characterized in that: The top of threaded rod (13) is fixedly connected with rotary cap (14), the bottom of threaded rod (13) is fixedly connected with fixed disc (15), the bottom of fixed disc (15) is installed with second electrode block (16), one side of fixed frame (12) is provided with warning light (17), the warning light (17), second electrode block (16) and first electrode block (10) are electrically connected.

4. The selective adsorption and recovery device for heavy metal ions in surface treatment wastewater according to claim 1, characterized in that: The bottom of first adsorption column (1) is fixedly connected with first delivery pipeline (103), the bottom of first delivery pipeline (103) is fixedly connected at the top of liquid outlet pipe (4), one side of first delivery pipeline (103) is provided with third electromagnetic valve (104), the bottom of second adsorption column (2) is fixedly connected with second delivery pipeline (203), the bottom of second delivery pipeline (203) is fixedly connected at the top of liquid outlet pipe (4), one side of second delivery pipeline (203) is provided with fourth electromagnetic valve (204).

5. The selective adsorption and recovery device for heavy metal ions in surface treatment wastewater according to claim 4, characterized in that: The top of first delivery pipeline (103) is provided with first heavy metal detector (18), the top of second delivery pipeline (203) is provided with second heavy metal detector (19).

6. The surface treatment wastewater heavy metal ion selective adsorption and recovery device according to claim 1, characterized in that: The bottom end of the first adsorption column (1) is fixedly connected with a first acid solution inlet pipe (105), one side of the first acid solution inlet pipe (105) is provided with a fifth electromagnetic valve (106), the top end of the first adsorption column (1) is fixedly connected with a first discharge pipe (107), one side of the first discharge pipe (107) is provided with a sixth electromagnetic valve (108).

7. The surface treatment wastewater heavy metal ion selective adsorption and recovery device according to claim 1, characterized in that: The bottom end of the second adsorption column (2) is fixedly connected with a second acid solution inlet pipe (205), one side of the second acid solution inlet pipe (205) is provided with a seventh electromagnetic valve (206), the top end of the second adsorption column (2) is fixedly connected with a second discharge pipe (207), one side of the second discharge pipe (207) is provided with an eighth electromagnetic valve (208).

8. The surface treatment wastewater heavy metal ion selective adsorption and recovery device according to claim 1, characterized in that: One side of the first input pipe (101) is fixedly connected with a first inlet pipe (109), one side of the first inlet pipe (109) is provided with a ninth electromagnetic valve (110), one side of the second input pipe (201) is fixedly connected with a second inlet pipe (209), one side of the second inlet pipe (209) is provided with a tenth electromagnetic valve (210).

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