An electrolytic device for removing chromium from laboratory CODcr wastewater

Abstract

This utility model relates to the field of wastewater treatment technology, and in particular to an electrolytic device for removing chromium from laboratory CODcr wastewater. The device includes a storage tank, an electrolytic tank, a sedimentation tank, a first peristaltic pump, and a second peristaltic pump. A detection mechanism is fixedly connected to the lower right end of the electrolytic tank. A first output pipe is inserted and fixedly installed on the upper outer surface of the first peristaltic pump, and the left end of the first output pipe is inserted and fixedly connected to the right end of the storage tank. A second input pipe is inserted and fixedly installed on the right end of the second peristaltic pump, and the lower end of the second input pipe is inserted and fixedly connected to the upper end of the sedimentation tank. The electrolytic device for removing chromium from laboratory CODcr wastewater described in this utility model uses a second solenoid valve to drive a winding roller to rotate, automatically winding and replacing the used rolls of diphenylcarbazide test paper. This places the unused portion of the rolls of diphenylcarbazide test paper on the drive roller into the detection box for easy re-testing, improving detection efficiency and ease of use.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to an electrolytic device for removing chromium from laboratory CODcr wastewater. Background Technology

[0002] In laboratory research and experimental activities, a large amount of wastewater containing chromium ions is often generated. Chromium is a heavy metal pollutant with high toxicity and great harm. If such chromium-containing wastewater is discharged directly without proper treatment, chromium ions will accumulate in the environment, damage the soil structure, reduce soil fertility, affect crop growth, and deteriorate water quality, poison aquatic organisms, and disrupt the balance of the entire aquatic ecosystem after entering the water body.

[0003] However, traditional devices for removing chromium from laboratory CODcr wastewater do not perform pre-treatment filtration, causing impurities in the wastewater to directly enter subsequent treatment stages. These impurities easily clog pipes and reduce treatment effectiveness, leading to frequent malfunctions and low efficiency, which seriously affects the progress and quality of wastewater treatment. In addition, traditional devices for removing chromium from laboratory CODcr wastewater cannot replace the test strips in a timely manner after electrolysis, requiring manual replacement each time, which is inefficient and inconvenient to use. Therefore, we have introduced an electrolytic device for removing chromium from laboratory CODcr wastewater. Utility Model Content

[0004] The main objective of this invention is to provide an electrolytic device for removing chromium from laboratory CODcr wastewater, which can effectively solve the problems in the background art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An electrolytic device for removing chromium from laboratory CODcr wastewater includes a storage tank, an electrolytic tank, a sedimentation tank, a first peristaltic pump, and a second peristaltic pump. A filter assembly is movably sleeved on the upper end of the storage tank. A detection mechanism is fixedly connected to the lower right end of the electrolytic tank. A first output pipe is inserted and fixedly installed on the upper outer surface of the first peristaltic pump, with its left end connected to the right end of the storage tank. A first input pipe is inserted and fixedly installed on the right end of the first peristaltic pump, with its lower end connected to the upper end of the electrolytic tank. A second output pipe is inserted and fixedly connected on the upper outer surface of the second peristaltic pump, with its left end connected to the right end of the electrolytic tank. A second input pipe is inserted and fixedly installed on the right end of the second peristaltic pump, with its lower end connected to the upper end of the sedimentation tank. An alkali injection pipe is inserted and fixedly connected to the upper right side of the sedimentation tank. A pH meter is inserted and fixedly installed on the upper front of the sedimentation tank.

[0007] The electrolytic box includes an electrolytic box body, and an electrolytic cell is provided inside the electrolytic box body. An anode and a cathode are electrically connected to the upper inner wall of the electrolytic cell, with the cathode located inside the anode. A first servo motor is fixedly installed at the lower middle part of the electrolytic box body, and the output end of the first servo motor passes through the lower end of the electrolytic box body and extends into the electrolytic cell. A first spiral stirring blade is fixedly installed at the output end of the first servo motor. The upper end of the electrolytic box body is inserted and fixedly connected to the lower end of a first input pipe, and the right end of the electrolytic box body is inserted and fixedly connected to the left end of a second output pipe.

[0008] Preferably, the filter assembly includes a cover, a fixed pipe is inserted and fixedly connected to the middle of the upper end of the cover, a water inlet pipe is inserted and fixedly connected to the upper end of the fixed pipe, a first solenoid valve is movably installed on the outer surface of the fixed pipe, a filter bucket is fixedly connected to the lower end of the cover, a plurality of through-holes are opened on the outer surface of the filter bucket, and the lower end of the cover is movably connected to the upper end of the storage box.

[0009] By adopting the above technical solution, several through-holes on the outer surface of the filter tank can screen the wastewater before it enters the storage tank. These through-holes can effectively intercept larger particles of impurities in the wastewater, such as silt and suspended solid particles, preventing these impurities from entering the electrolysis tank with the wastewater. This avoids impurities adhering to the anode and cathode surfaces and affecting the electrolysis reaction, and also prevents impurities from accumulating in the electrolysis tank and sedimentation tank, clogging pipes or affecting the normal circulation of water, thereby ensuring the smooth operation of subsequent electrolysis and sedimentation treatment processes.

[0010] Preferably, the filter barrel is located inside the storage tank, and a plurality of filter holes are distributed in a circular array around the center of the filter barrel.

[0011] By adopting the above technical solution, the circular array of filter holes can ensure that the filtration effect is consistent in all parts when the wastewater passes through the filter barrel.

[0012] Preferably, the detection mechanism includes a detection box, with through-hole movable slots at the middle of the front and rear ends of the detection box. A drip pipe is fixedly connected to the middle of the upper end of the detection box. A second solenoid valve is movably installed on the left side of the outer surface of the drip pipe, and the left end of the second solenoid valve is fixedly connected to the right end of the electrolysis tank. Mounting plates are fixedly connected to the right side of the front and rear ends of the detection box. A second servo motor is fixedly installed on the front right end of the front mounting plate, and the output end of the second servo motor passes through the right end of the front mounting plate and extends to the left end of the front mounting plate. A take-up roller is fixedly installed on the output end of the second servo motor. A transmission roller is movably installed on the rear left end of the rear mounting plate via a rotating shaft. A roll of diphenylcarbazide test paper is movably sleeved on the outer surface of the take-up roller and the outer surface of the transmission roller. A water outlet pipe is fixedly connected to the middle of the lower end of the detection box. The left end of the detection box is fixedly connected to the right end of the electrolysis tank.

[0013] By adopting the above technical solution: when the second solenoid valve is opened, an appropriate amount of wastewater drips onto the roll-shaped diphenylcarbazide test paper through the drip pipe. The diphenylcarbazide test paper is extremely sensitive to chromium ions. Once it comes into contact with wastewater containing chromium ions, a color reaction will occur rapidly. By observing the color change of the test paper, the operator can understand the chromium content in the wastewater after electrolysis in real time and intuitively, providing a direct basis for judging the electrolysis effect.

[0014] Preferably, the used head of the roll of diphenylcarbazide test paper is wound around the take-up roller, the unused tail of the roll of diphenylcarbazide test paper is movably sleeved on the drive roller, and the middle part of the roll of diphenylcarbazide test paper is movably sleeved in two corresponding movable slots and located in the detection box.

[0015] By adopting the above technical solution, the used head of the roll-shaped diphenylcarbazide test paper is wound around the take-up roller, and the unused tail is sleeved on the drive roller, forming a closed-loop structure for automatic test paper replacement. When a new test is required, the second servo motor is activated, which drives the take-up roller to rotate. The used test paper portion is gradually wound around the take-up roller, while the drive roller releases the unused test paper portion. This automatic replacement method greatly improves the testing efficiency, eliminates the need for manual test paper replacement, reduces human error, and saves labor costs.

[0016] Preferably, the sedimentation tank includes a sedimentation tank body. A third servo motor is fixedly installed at the upper middle part of the sedimentation tank body, and the output end of the third servo motor passes through the upper end of the sedimentation tank body and extends into the sedimentation tank body. A rotating rod is fixedly installed at the output end of the third servo motor. A second spiral stirring blade is fixedly connected to the outer surface of the rotating rod. Several vertically penetrating stirring holes are opened at the upper end of the second spiral stirring blade. A drain pipe is inserted and fixedly connected at the lower middle part of the sedimentation tank body. A third solenoid valve is movably installed on the upper part of the outer surface of the drain pipe. A drain pipe is inserted and fixedly connected at the lower right end of the sedimentation tank body. A fourth solenoid valve is movably installed on the left side of the outer surface of the drain pipe. The upper end of the sedimentation tank body is inserted and fixedly connected to the lower end of the second input pipe.

[0017] By adopting the above technical solution: the third servo motor installed in the middle of the upper part of the sedimentation tank can drive the rotating rod and the second spiral stirring blade fixed on its outer surface to rotate. During the process of adding alkaline solution and mixing with chromium-containing wastewater for sedimentation, the second spiral stirring blade can generate strong convection and circulation of the liquid, accelerate the reaction of chromium ions with alkaline solution, and greatly improve the sedimentation efficiency. The design of the stirring through hole allows the liquid to flow quickly between the upper and lower layers of the second spiral stirring blade through the stirring through hole, enhancing the mixing effect. On the other hand, during stirring, the stirring through hole can reduce the liquid resistance on the stirring blade, reduce the energy consumption of the third servo motor, and at the same time ensure the uniformity of stirring, ensuring that the chromium ions in the entire sedimentation tank can fully participate in the reaction to form precipitate.

[0018] Preferably, a plurality of the stirring through holes are arranged in a circular array around the center of the second spiral stirring blade, and there is a gap between the outer surface of the second spiral stirring blade and the inner wall of the sedimentation tank.

[0019] By adopting the above technical solution, a gap exists between the outer surface of the second spiral stirring blade and the inner wall of the settling tank, providing an additional flow channel for the liquid. During the stirring process, some liquid can flow through this gap, forming fluids with different flow rates and directions with the liquid in the area directly interacting with the second spiral stirring blade. This enhances the turbulence of the liquid, helps to accelerate liquid renewal, and allows the liquid in the settling tank to mix more quickly with the newly added alkali solution, further improving the reaction efficiency. At the same time, the flow of liquid in the gap can also flush the inner wall of the settling tank, reducing the adhesion and accumulation of precipitates on the inner wall of the settling tank, keeping the inner wall of the settling tank clean, and facilitating long-term stable operation.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] In this invention, the detection mechanism can detect the chromium content in the wastewater after electrolysis in real time. Opening the second solenoid valve allows some of the treated wastewater to drip into the detection box through a drip pipe. The second servo motor drives the winding roller to bring the roll of diphenylcarbazide test paper into contact with the wastewater. The electrolysis effect is visually judged based on the color change of the test paper, facilitating timely adjustment of electrolysis parameters and ensuring that the treated wastewater meets the expected standards. The second solenoid valve drives the winding roller to rotate, automatically winding and replacing the used roll of diphenylcarbazide test paper. This places the unused portion of the roll of diphenylcarbazide test paper on the transmission roller into the detection box for easy testing next time, improving detection efficiency and offering high ease of use.

[0022] In this invention, the electrolytic cell inside the electrolytic tank is equipped with an anode and a cathode, with the cathode located inside the anode. The cathode, in conjunction with the first servo motor driving the first spiral stirring blade, stirs the wastewater, making the electrolysis reaction more complete and greatly improving the electrolysis efficiency of chromium in the wastewater. This allows for more effective separation of chromium ions from the wastewater.

[0023] In this utility model, by setting a filter assembly at the top of the storage tank, wastewater enters through the inlet pipe, and the water flow is controlled by the first solenoid valve. The water then enters the filter bucket through the fixed pipe. The filter holes distributed in a ring array on the outer surface of the filter bucket can effectively filter impurities in the wastewater, preventing them from entering the subsequent treatment process and affecting the electrolysis and precipitation effect. This ensures the smooth operation of the entire treatment process and improves the treatment efficiency.

[0024] In this invention, a third servo motor in the sedimentation tank drives the rotating rod and the second spiral stirring blade to rotate, stirring and mixing the wastewater after the addition of alkaline solution, promoting the precipitation of chromium ions. The ring-shaped array of stirring holes on the second spiral stirring blade and the gap between it and the inner wall of the sedimentation tank make the stirring more uniform and the liquid flow smoother, improving the sedimentation efficiency and separation effect. At the same time, the pH of the liquid in the sedimentation tank is monitored by a pH meter to ensure that the precipitation reaction proceeds fully. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an electrolytic device for removing chromium from laboratory CODcr wastewater according to this utility model.

[0026] Figure 2 This is a cross-sectional view of the structure of an electrolytic device for removing chromium from laboratory CODcr wastewater according to the present invention (the storage tank, electrolytic tank, sedimentation tank and filter assembly are shown in the cross-section).

[0027] Figure 3 This is a schematic diagram of the filter assembly of an electrolytic device for removing chromium from laboratory CODcr wastewater according to the present invention (the cover of the tank is cut out).

[0028] Figure 4This invention relates to an electrolytic device for removing chromium from laboratory CODcr wastewater. Figure 3 Enlarged view of the structure at point A in the image;

[0029] Figure 5 This is a schematic diagram of the electrolysis tank of an electrolysis device for removing chromium from laboratory CODcr wastewater according to the present invention (the electrolysis tank body is cut out).

[0030] Figure 6 This is a schematic diagram of the detection mechanism of an electrolytic device for removing chromium from laboratory CODcr wastewater according to this utility model (the detection box is cut out).

[0031] Figure 7 This is a schematic diagram of the sedimentation tank of an electrolytic device for removing chromium from laboratory CODcr wastewater according to this utility model (the sedimentation tank is cut in half).

[0032] In the diagram: 1. Storage tank; 2. Electrolysis tank; 3. Sedimentation tank; 4. Filter assembly; 5. Detection mechanism; 6. First peristaltic pump; 7. First output pipe; 8. First input pipe; 9. Second peristaltic pump; 10. Second output pipe; 11. Second input pipe; 12. Alkali solution filling pipe; 13. pH meter; 41. Tank cover; 42. Fixing pipe; 43. Water inlet pipe; 44. First solenoid valve; 45. Filter barrel; 46. Filter hole; 21. Electrolysis tank body; 22. Electrolytic cell; 23. Anode; 24. Cathode; 25. ... 1. Servo motor; 26. First spiral stirring blade; 51. Detection box; 52. Movable groove; 53. Drip pipe; 54. Second solenoid valve; 55. Mounting plate; 56. Second servo motor; 57. Take-up roller; 58. Drive roller; 59. Rolled diphenylcarbazide test paper; 591. Water outlet pipe; 31. Sedimentation tank; 32. Third servo motor; 33. Rotating rod; 34. Second spiral stirring blade; 35. Stirring through hole; 36. Sewage pipe; 37. Third solenoid valve; 38. Drain pipe; 39. Fourth solenoid valve. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0035] Example 1

[0036] Please see Figure 1-7 This utility model provides a technical solution:

[0037] An electrolytic device for removing chromium from laboratory CODcr wastewater includes a storage tank 1, an electrolysis tank 2, a sedimentation tank 3, a first peristaltic pump 6, and a second peristaltic pump 9. A filter assembly 4 is movably sleeved on the upper end of the storage tank 1. A detection mechanism 5 is fixedly connected to the lower right end of the electrolysis tank 2. A first output pipe 7 is inserted and fixedly installed on the upper outer surface of the first peristaltic pump 6, and the left end of the first output pipe 7 is inserted and fixedly connected to the right end of the storage tank 1. A first input pipe 8 is inserted and fixedly installed on the right end of the first peristaltic pump 6. The lower end of the inlet pipe 8 is inserted and fixedly connected to the upper end of the electrolysis tank 2. The upper part of the outer surface of the second peristaltic pump 9 is inserted and fixedly connected to the second output pipe 10, and the left end of the second output pipe 10 is inserted and fixedly connected to the right end of the electrolysis tank 2. The right end of the second peristaltic pump 9 is inserted and fixedly installed with the second input pipe 11, and the lower end of the second input pipe 11 is inserted and fixedly connected to the upper end of the sedimentation tank 3. The upper right part of the sedimentation tank 3 is inserted and fixedly connected with the alkali solution injection pipe 12. The upper front part of the sedimentation tank 3 is inserted and fixedly installed with the pH meter 13.

[0038] In this embodiment, the electrolytic box 2 includes an electrolytic box body 21, and an electrolytic cell 22 is disposed inside the electrolytic box body 21. An anode 23 and a cathode 24 are electrically connected to the upper inner wall of the electrolytic cell 22, with the cathode 24 located inside the anode 23. A first servo motor 25 is fixedly installed at the lower middle part of the electrolytic box body 21, and the output end of the first servo motor 25 passes through the lower end of the electrolytic box body 21 and extends into the electrolytic cell 22. A first spiral stirring blade 26 is fixedly installed at the output end of the first servo motor 25. The upper end of the electrolytic box body 21 is inserted and fixedly connected to the lower end of the first input pipe 8, and the right end of the electrolytic box body 21 is connected to the left end of the second output pipe 10. The filter assembly 4 includes a cover 41, with a fixed pipe 42 fixedly connected to the middle of the upper part of the cover 41. A water inlet pipe 43 is fixedly connected to the upper end of the fixed pipe 42. A first solenoid valve 44 is movably installed on the outer surface of the fixed pipe 42. A filter barrel 45 is fixedly connected to the lower end of the cover 41. Several filter holes 46 are opened on the outer surface of the filter barrel 45. The lower end of the cover 41 is movably connected to the upper end of the storage box 1. The filter barrel 45 is located inside the storage box 1, and several filter holes 46 are distributed in a circular array around the center of the filter barrel 45. The detection mechanism 5 includes a detection box 51, with the detection box 51 having a front middle section and a rear end section. The middle section has an internally and externally perforated movable groove 52. A drip pipe 53 is inserted and fixedly connected to the upper middle part of the detection box 51. A second solenoid valve 54 is movably installed on the left side of the outer surface of the drip pipe 53, and the left end of the second solenoid valve 54 is inserted and fixedly connected to the right end of the electrolysis tank 21. Mounting plates 55 are fixedly connected to the front right and rear right of the detection box 51. A second servo motor 56 is fixedly installed on the front right end of the front mounting plate 55, and the output end of the second servo motor 56 passes through the right end of the front mounting plate 55 and extends to the left end of the front mounting plate 55. A winding roller 57 is fixedly installed on the output end of the second servo motor 56. The rear mounting plate 57 is fixedly installed on the rear side. A drive roller 58 is movably mounted on the rear left end of plate 55 via a rotating shaft. A roll of diphenylcarbazide test paper 59 is movably sleeved on the outer surface of take-up roller 57 and the outer surface of drive roller 58. A water outlet pipe 591 is inserted and fixedly connected to the middle of the lower end of test box 51. The left end of test box 51 is fixedly connected to the right end of electrolysis box 21. After use, the head of the roll of diphenylcarbazide test paper 59 is wound around take-up roller 57. The unused tail of roll of diphenylcarbazide test paper 59 is movably sleeved on drive roller 58. The middle part of roll of diphenylcarbazide test paper 59 is movably sleeved in the corresponding two movable slots 52 and located in test box 51.The sedimentation tank 3 includes a sedimentation tank body 31. A third servo motor 32 is fixedly installed at the upper middle part of the sedimentation tank body 31, and the output end of the third servo motor 32 passes through the upper end of the sedimentation tank body 31 and extends into the sedimentation tank body 31. A rotating rod 33 is fixedly installed at the output end of the third servo motor 32. A second spiral stirring blade 34 is fixedly connected to the outer surface of the rotating rod 33. Several vertically penetrating stirring holes 35 are opened at the upper end of the second spiral stirring blade 34. A sludge discharge device is inserted and fixedly connected at the lower middle part of the sedimentation tank body 31. A third solenoid valve 37 is movably installed on the upper part of the outer surface of the drain pipe 36. A drain pipe 38 is fixedly connected to the lower right end of the sedimentation tank 31. A fourth solenoid valve 39 is movably installed on the left part of the outer surface of the drain pipe 38. The upper end of the sedimentation tank 31 is fixedly connected to the lower end of the second input pipe 11. Several stirring holes 35 are arranged in a circular array around the center of the second spiral stirring blade 34. There is a gap between the outer surface of the second spiral stirring blade 34 and the inner wall of the sedimentation tank 31.

[0039] It should be noted that this utility model is an electrolytic device for removing chromium from laboratory CODcr wastewater. During use, wastewater is input through the inlet pipe 43, and the first solenoid valve 44 controls the water flow. The wastewater enters the filter tank 45 below the tank cover 41 through the fixed pipe 42. The filter tank 45 filters the wastewater through the filter holes 46 arranged in a ring on its outer surface. The filtered wastewater flows into the storage tank 1. The first peristaltic pump 6 is started, and wastewater is drawn from the storage tank 1 through the first output pipe 7 and injected into the electrolytic cell 22 of the electrolytic tank 2 through the first input pipe 8. The first servo motor 25 is activated, and its output drives the first spiral stirring blade 26 to rotate within the electrolytic cell 22, stirring the wastewater. Simultaneously, the anode 23 and cathode 24 are energized to electrolyze the chromium in the wastewater. The second solenoid valve 54 is opened, and a portion of the treated wastewater in the electrolytic tank 2 drips into the detection box 51 through the drip pipe 53. The second servo motor 56 is activated, and its output drives the take-up roller 57 to rotate. The unused portion of the roll of diphenylcarbazide test paper 59 is released from the transmission roller 58 and passes through the two movable slots 52 within the detection box 51. The test strip comes into contact with the dripping wastewater, and the chromium content in the wastewater after electrolysis is detected by the color change of the test strip. After use, the test strip head is wound onto the take-up roller 57 by the second servo motor 56. The wastewater after testing is discharged through the outlet pipe 591. When the wastewater after electrolysis reaches the expected treatment effect, the second peristaltic pump 9 is started, and wastewater is drawn from the electrolysis tank 2 through the second output pipe 10 and injected into the sedimentation tank 31 of the sedimentation tank 3 through the second input pipe 11. Alkali solution is added into the sedimentation tank 31 through the alkali solution injection pipe 12. The third servo motor 32 is turned on, and its output end is equipped with... The rotating rod 33 and the second spiral stirring blade 34 rotate to stir and mix the wastewater and alkaline solution, causing chromium ions to precipitate. The annular array of stirring holes 35 on the second spiral stirring blade 34 can make the stirring more uniform. There is a gap between its outer surface and the inner wall of the sedimentation tank 31 to facilitate liquid flow. The pH of the liquid in the sedimentation tank 31 is monitored by the pH meter 13 to ensure that the reaction is fully carried out. After the sedimentation is completed, the third solenoid valve 37 is opened to discharge the precipitate through the drain pipe 36. The fourth solenoid valve 39 is opened to discharge the treated clean water through the drain pipe 38.

[0040] In the embodiments provided in this application, it should be understood that the disclosed systems, modules, and methods can be implemented in other ways. For example, the module embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, or indirect coupling or communication connection between modules or units, and may be electrical, mechanical, or other forms.

[0041] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. This application is not limited to the exact structures described above and illustrated in the accompanying drawings, and it should not be considered that the specific implementation of this application is limited to these descriptions. For those skilled in the art, various changes and modifications made without departing from the concept of this application should be considered to fall within the protection scope of this application.

Claims

1. An electrolytic device for removing chromium from laboratory CODcr wastewater, comprising a storage tank (1), an electrolytic tank (2), a sedimentation tank (3), a first peristaltic pump (6), and a second peristaltic pump (9), characterized in that: A filter assembly (4) is movably sleeved on the upper end of the storage tank (1). A detection mechanism (5) is fixedly connected to the lower right end of the electrolysis tank (2). A first output pipe (7) is inserted and fixedly installed on the upper outer surface of the first peristaltic pump (6), and the left end of the first output pipe (7) is inserted and fixedly connected to the right end of the storage tank (1). A first input pipe (8) is inserted and fixedly installed on the right end of the first peristaltic pump (6), and the lower end of the first input pipe (8) is inserted and fixedly connected to the upper end of the electrolysis tank (2). The second peristaltic pump... A second output pipe (10) is fixedly connected to the upper part of the outer surface of the pump (9), and the left end of the second output pipe (10) is fixedly connected to the right end of the electrolysis tank (2). A second input pipe (11) is fixedly installed at the right end of the second peristaltic pump (9), and the lower end of the second input pipe (11) is fixedly connected to the upper end of the sedimentation tank (3). An alkali injection pipe (12) is fixedly connected to the upper right part of the sedimentation tank (3). A pH meter (13) is fixedly installed at the front of the upper end of the sedimentation tank (3). The electrolytic box (2) includes an electrolytic box body (21), and an electrolytic cell (22) is provided inside the electrolytic box body (21). An anode (23) and a cathode (24) are electrically connected to the upper inner wall of the electrolytic cell (22), and the cathode (24) is located inside the anode (23). A first servo motor (25) is fixedly installed in the middle of the lower end of the electrolytic box body (21), and the output end of the first servo motor (25) passes through the lower end of the electrolytic box body (21) and extends into the electrolytic cell (22). A first spiral stirring blade (26) is fixedly installed in the output end of the first servo motor (25). The upper end of the electrolytic box body (21) is inserted and fixedly connected to the lower end of the first input pipe (8). The right end of the electrolytic box body (21) is inserted and fixedly connected to the left end of the second output pipe (10).

2. The electrolytic device for removing chromium from laboratory CODcr wastewater according to claim 1, characterized in that: The filter assembly (4) includes a box cover (41), a fixed pipe (42) is inserted and fixedly connected to the middle of the upper end of the box cover (41), a water inlet pipe (43) is inserted and fixedly connected to the upper end of the fixed pipe (42), a first solenoid valve (44) is movably installed on the outer surface of the fixed pipe (42), a filter bucket (45) is fixedly connected to the lower end of the box cover (41), a number of filter holes (46) with internal and external penetration are opened on the outer surface of the filter bucket (45), and the lower end of the box cover (41) is movably connected to the upper end of the storage box (1).

3. The electrolytic device for removing chromium from laboratory CODcr wastewater according to claim 2, characterized in that: The filter barrel (45) is located inside the storage tank (1), and a plurality of filter holes (46) are arranged in a circular array around the center of the filter barrel (45).

4. The electrolytic device for removing chromium from laboratory CODcr wastewater according to claim 1, characterized in that: The detection mechanism (5) includes a detection box (51). The detection box (51) has through-hole slots (52) at both the middle of its front and rear ends. A drip pipe (53) is fixedly connected to the middle of the upper end of the detection box (51). A second solenoid valve (54) is movably installed on the left side of the outer surface of the drip pipe (53), and the left end of the second solenoid valve (54) is fixedly connected to the right end of the electrolysis tank (21). Mounting plates (55) are fixedly connected to the right side of both the front and rear ends of the detection box (51). A second servo motor (56) is fixedly installed on the front right end of the mounting plate (55). The output end of the servo motor (56) passes through the right end of the front mounting plate (55) and extends to the left end of the front mounting plate (55). The output end of the second servo motor (56) is fixedly mounted with a take-up roller (57). The rear part of the left end of the rear mounting plate (55) is movably mounted with a transmission roller (58) through a rotating shaft. The outer surface of the take-up roller (57) and the outer surface of the transmission roller (58) are movably sleeved with a roll of diphenylcarbazide test paper (59). The lower middle part of the detection box (51) is fixedly connected with a water outlet pipe (591). The left end of the detection box (51) is fixedly connected to the right end of the electrolysis box (21).

5. The electrolytic device for removing chromium from laboratory CODcr wastewater according to claim 4, characterized in that: After use, the head of the rolled diphenylcarbazide test paper (59) is wound around the take-up roller (57), the unused tail of the rolled diphenylcarbazide test paper (59) is movably sleeved on the drive roller (58), and the middle part of the rolled diphenylcarbazide test paper (59) is movably sleeved in the corresponding two movable slots (52) and located in the detection box (51).

6. The electrolytic device for removing chromium from laboratory CODcr wastewater according to claim 1, characterized in that: The sedimentation tank (3) includes a sedimentation tank body (31). A third servo motor (32) is fixedly installed at the middle of the upper end of the sedimentation tank body (31), and the output end of the third servo motor (32) passes through the upper end of the sedimentation tank body (31) and extends into the sedimentation tank body (31). A rotating rod (33) is fixedly installed at the output end of the third servo motor (32). A second spiral stirring blade (34) is fixedly connected to the outer surface of the rotating rod (33). The upper end of the second spiral stirring blade (34) has several openings. A stirring through hole (35) is passed through the bottom. A drain pipe (36) is fixedly connected to the middle of the lower end of the sedimentation tank (31). A third solenoid valve (37) is movably installed on the upper part of the outer surface of the drain pipe (36). A drain pipe (38) is fixedly connected to the lower right end of the sedimentation tank (31). A fourth solenoid valve (39) is movably installed on the left side of the outer surface of the drain pipe (38). The upper end of the sedimentation tank (31) is fixedly connected to the lower end of the second input pipe (11).

7. The electrolytic device for removing chromium from laboratory CODcr wastewater according to claim 6, characterized in that: Several of the stirring through holes (35) are arranged in a ring array around the center of the second spiral stirring blade (34), and there is a gap between the outer surface of the second spiral stirring blade (34) and the inner wall of the sedimentation tank (31).

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