Electroplating wastewater treatment device and method

Abstract

The application relates to an electroplating wastewater treatment equipment and method, and relates to the technical field of electroplating wastewater treatment. The equipment comprises a vertically arranged treatment box, a partition plate is arranged in the treatment box, the treatment box is divided into an electrolysis box and a flocculation box arranged in sequence along the height direction by the partition plate, the flocculation box is arranged at the bottom side of the electrolysis box, a water inlet is arranged at the top side of the electrolysis box, an electrolysis assembly is arranged on the electrolysis box, and a flocculation assembly is arranged in the flocculation box. The application has the effects of facilitating efficient combination of electrolysis treatment and chemical treatment and reducing post-treatment caused by insufficient electrolysis or excessive electrolysis.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a plating wastewater treatment equipment and method. BACKGROUND

[0002] The plating wastewater is industrial wastewater containing a large amount of heavy metals, acid and alkali, cyanide and other toxic and harmful substances generated in the production process of the plating industry, which is complex in composition, harmful and difficult to treat, and needs to be treated by physical, chemical, biological and other technical means to achieve standard discharge and resource utilization.

[0003] When electrolysis is used to electrolyze the plating wastewater, if chromium ions need to be reduced to chromium single element, the electrolyte and voltage have very high requirements, the cost is high when treating large-scale plating wastewater, and the heavy metals in the plating wastewater are reduced to metal single element and deposited on the cathode. With the deposition of metal single element and the reduction of plating liquid concentration, the electrolysis reaction will slow down, thereby affecting the recycling efficiency of the plating wastewater.

[0004] When chemical method is used for treatment, the plating wastewater needs to be neutralized and precipitated to generate a large amount of sludge containing heavy metals, the dewatering cost of the sludge is high, and the chromium ions need to be reduced first and then precipitated. If the reduction is not complete, it will cause toxic residues, so it needs to be improved.

[0005] Some processes also use electrolysis and chemical methods for combined treatment, that is, trivalent chromium ions and trivalent iron ions are formed by electrolysis, and then the trivalent chromium ions and trivalent iron ions are precipitated and filtered by chemical method. When the combined treatment is carried out by this method, the plating solution often needs to be treated harmlessly only when the effective components in the plating solution are completely consumed. When the electrolysis and chemical methods are combined for harmless treatment, too much reagent needs to be added for chemical treatment to ensure complete precipitation, but this operation is easy to produce toxic by-products, which causes difficulty in subsequent treatment. SUMMARY

[0006] In order to efficiently combine electrolysis treatment and chemical treatment and reduce the problems of insufficient electrolysis or excessive electrolysis, the present application provides a plating wastewater treatment equipment and method.

[0007] The plating wastewater treatment equipment and method provided by the present application adopts the following technical scheme:

[0008] A plating wastewater treatment equipment and method, comprising a vertically arranged rack, an electrolysis box and a flocculation box arranged in sequence in the height direction on the rack, the flocculation box being arranged on the bottom side of the electrolysis box, the top side of the electrolysis box being open, an electrolysis assembly being arranged on the electrolysis box, and a flocculation assembly being arranged in the flocculation box.

[0009] The electrolysis assembly comprises a rotating disc rotatably arranged on the electrolysis box, an electrode head arranged on the rotating disc and extending into the electrolysis box, and a driving member for driving the electrode head to rotate, the electrode head comprises a cathode and an anode arranged on the rotating disc, the cathode is slidingly arranged on the rotating disc, and a distance member for periodically adjusting the distance between the cathode and the anode is further arranged on the rotating disc;

[0010] The flocculation assembly comprises a plurality of flocculation plates arranged in the flocculation box, a feeding box arranged on one side of the flocculation box, and a scraping member for scraping the flocculation material on the flocculation plate, the feeding box stores a flocculating agent, and the feeding box further comprises an adding member for adding the flocculating agent;

[0011] A feeding port is arranged on the top side of the electrolysis box, and a detection member for detecting the water inflow is arranged at the feeding port;

[0012] When the detection member detects that there is a large amount of wastewater in the electrolysis box, the adjustment period of the distance member becomes longer, and the adding amount of the feeding box becomes larger;

[0013] When the detection member detects that there is a small amount of wastewater in the electrolysis box, the adjustment period of the distance member becomes shorter, and the adding amount of the feeding box becomes smaller.

[0014] By adopting the above technical scheme, if the electrolysis degree is low, the hexavalent chromium ions are not easy to be completely reduced to trivalent chromium ions, and toxic residues are easy to be produced, and the adding amount of the chemical agent needs to be large, which leads to higher requirements for subsequent sludge treatment; if the electrolysis degree is high, heavy metals are easy to be dissolved again, and the cathode material is easy to be excessively consumed, which affects the efficiency of subsequent electrolysis, and the adding amount of subsequent chemical agent is not easy to be judged, and too much or excessive adding amount of the chemical agent is easy to produce by-products which are difficult to handle.

[0015] The detection member is arranged to detect the water inflow in the electrolysis box, and the voltage is basically constant when different amounts of wastewater are electrolyzed, and as the electrolysis process proceeds, the hexavalent chromium ions are reduced to trivalent chromium ions to form chromium hydroxide precipitate, and the concentration of the electrolyte in the electrolytic cell is reduced, thereby reducing the electrolysis efficiency, so the treatment efficiency of the wastewater tends to become slower and slower as the electrolysis proceeds.

[0016] If the voltage input is increased, the electrode polarization is easy to occur, and the hexavalent chromium ions are easy to be directly reduced to metallic chromium and attached to the cathode, causing the electrode passivation and affecting the subsequent electrolysis, and the electrolyte temperature is increased, which is easy to cause safety accidents, so constant voltage is often required during electrolysis.

[0017] The distance between the two electrodes is adjusted by the distance piece, so that when the concentration in the electrolytic cell is reduced, the distance between the two electrodes is reduced under the condition that the voltage is unchanged, thereby achieving the effect of rapid electrolysis reaction without electrode polarization and improving the service life of the electrode.

[0018] Meanwhile, the amount of flocculant added is adjusted according to the amount of wastewater in the electrolytic cell. The wastewater generated by electroplating often has little difference in indicators and concentration, and the amount of flocculant added is proportional to the amount of wastewater. If the amount of flocculant added is small, it is not easy to effectively flocculate the precipitated metal particles. If the amount of flocculant added is large, the treated wastewater needs to be treated further. By adjusting the amount of flocculant added by the adding piece, the efficiency of wastewater treatment is improved and the subsequent treatment steps are reduced.

[0019] Moreover, the flocculant cannot be added at one time. One-time addition of flocculant can easily cause particles to be wrapped in stable colloids, hindering further aggregation.

[0020] Meanwhile, by rotating the rotating disc and the electrode head provided on the rotating disc, the electrode head rotates at a speed of 100-500 rpm to form a centrifugal field and a turbulent effect in the electrolytic cell. The thickness of the diffusion layer formed on the surface of the electrode in traditional static electrolysis is reduced from 50-200 pm to 10-30 pm, reducing the concentration polarization resistance. The vortex generated by the high-speed relative movement of the wastewater and the electrode surface makes the current density distribution on the electrode surface more uniform, avoiding local hydrogen evolution or passivation caused by edge effects in traditional electrolysis, and suppressing side reactions.

[0021] Optionally, the detection piece includes a detection blade rotatably arranged at the feed inlet, the detection blade is in contact with the wastewater, and a rotating shaft of the detection blade is provided with a rotating rod. The adding piece includes a feeding tank arranged at the bottom side of the feeding tank, and a feeding opening is arranged at the connection between the feeding tank and the feeding tank. A feeding opening is formed in the feeding tank and is in communication with the flocculation tank. A feeding wheel is rotatably arranged at the feeding opening, and a containing groove for placing the flocculant is formed in the feeding wheel. The containing groove is arranged in multiple groups, and the multiple groups of containing grooves are uniformly arranged along the outer peripheral wall of the feeding wheel. The feeding wheel movably blocks the feeding opening, and the feeding wheel is in transmission connection with the detection blade.

[0022] By adopting the above technical scheme, when the wastewater impacts the detection blade to rotate, the detection blade rotates to drive the feeding wheel to rotate. The larger the amount of wastewater, the more the number of rotations of the detection blade. Since the feeding wheel blocks the feeding opening, the flocculant in the feeding tank is not easy to fall into the feeding tank when the feeding wheel does not rotate. That is, when the wastewater is not treated, the flocculant is in a sealed state under the action of the feeding wheel and is not easy to fall into the feeding tank, thereby improving the precision of flocculant addition.

[0023] Meanwhile, a receiving trough is opened on the feeding wheel. When the feeding wheel rotates to the position of the receiving trough in the feeding box, the flocculant falls into the receiving trough. When the feeding wheel rotates to the position of the receiving trough in the feeding box, the flocculant in the receiving trough falls into the feeding box under the action of gravity, for wastewater treatment.

[0024] Optionally, a feeding plate is slidably provided at the feeding port, the feeding plate movably blocks the feeding port, and the sliding period of the feeding plate is related to the rotation period of the rotating disk. The flocculation box is provided with a synchronous moving element for synchronizing the movement of the rotating disk and the feeding plate.

[0025] By adopting the above technical solution, after the wastewater has completely entered the electrolysis tank, the inlet is first blocked. Then, the power source drives the rotating disk and rotating rod to rotate. When the rotating rod rotates, the moving part drives the feeding plate to slide synchronously, realizing the feeding of flocculant. Thus, the flocculant will only enter the flocculation box for flocculation when the wastewater is in the wastewater treatment chamber, further improving the accuracy of flocculant addition.

[0026] Optionally, the rotating rod of the rotating disk passes through the partition and the flocculation plate. The scraping component includes a scraper on the rotating rod and a hole-clearing roller on the rotating rod. Multiple sets of scraping components are provided, and each set of scraping components corresponds to a set of flocculation plates. The scraper is located on the bottom side of the flocculation plate, and the hole-clearing roller is located on the top side of the flocculation plate. The hole-clearing roller is rotatably mounted on the rotating rod, and the rotation axis of the hole-clearing roller is perpendicular to the rotating rod. Multiple sets of cleaning heads are provided on the hole-clearing roller, and the cleaning heads are movably inserted into the filter holes. A co-moving gear ring is provided on the inner wall of the flocculation box, and a co-moving gear is provided on the hole-clearing roller. The co-moving gear meshes with the co-moving gear ring.

[0027] By adopting the above technical solution, during the rotation of the rotating rod, the pore-cleaning roller rotates along with the rotating rod. At this time, the pore-cleaning roller revolves relative to the rotating rod. Simultaneously, as the pore-cleaning roller rotates relative to the rotating rod, it rotates on its own axis under the action of the synchronous gear and the synchronous gear ring. The cleaning head on the pore-cleaning roller automatically inserts into the filter holes on the flocculation plate, thereby cleaning the filter holes and reducing the filtration and flocculation efficiency problem caused by filter hole blockage.

[0028] Optionally, the electrolytic tank and the flocculation tank are provided with a first communication pipe and a second communication pipe, one end of the first communication pipe is communicated with the bottom side of the electrolytic tank, the other end of the first communication pipe is communicated with the bottom side of the flocculation tank, one end of the second communication pipe is communicated with the top side of the electrolytic tank, the other end of the second communication pipe is communicated with the top side of the flocculation tank, the first communication pipe is used for discharging the wastewater in the electrolytic tank into the flocculation tank, the second communication pipe is used for discharging the wastewater in the flocculation tank into the electrolytic tank, and the first communication pipe and the second communication pipe are both provided with a conveying member for conveying liquid.

[0029] By adopting the above technical scheme, the wastewater at the bottom side of the electrolytic tank is conveyed into the flocculation tank through the first communication pipe for flocculation, and the flocculation first-time precipitation is generated by electrolysis, so that the wastewater enters the flocculation tank for the first time for filtration of the flocculation.

[0030] Optionally, the conveying member includes a conveying impeller rotatably arranged in the first communication pipe / second communication pipe, a conveying wheel is arranged on the rotating shaft of the conveying impeller, a first bevel gear is arranged on the rotating rod, and a transmission structure is arranged between the first bevel gear and the conveying wheel.

[0031] By adopting the above technical scheme, the transmission structure drives the conveying wheel to rotate during the rotation of the rotating rod, the rotation of the conveying impeller is driven, the conveying of the flocculation is realized during the rotary stirring electrolysis of the wastewater in the electrolytic tank, the input of the additional power source is reduced, the energy is saved, the synchronization of electrolysis and flocculation is realized, and the problem of by-products generated by different steps is reduced.

[0032] Optionally, the second communication pipe is further provided with a liquid outlet, an electromagnetic valve is arranged at the liquid outlet, an electric conductivity detector is arranged on the electrolytic tank, and the electric conductivity detector is electrically connected with the electromagnetic valve.

[0033] By adopting the above technical scheme, the electric conductivity detector is used as the embodiment of the electrolysis and flocculation results, the accurate judgment of the wastewater treatment is realized, and the problem of hydrogen evolution caused by excessive electrolysis is reduced.

[0034] Optionally, the flocculation plate includes two flocculation splicing plates arranged in opposite splicing modes, a dismounting opening is arranged in the side wall of the flocculation tank, and the flocculation splicing plates are slidingly arranged at the dismounting opening.

[0035] By adopting the above technical scheme, the flocculation plate can be cleaned by taking out the flocculation splicing plate from the dismounting opening at the end of each wastewater treatment, so that the efficiency of the next wastewater treatment is improved.

[0036] Optionally, the detection blade is provided with a counting member for counting the number of rotations of the detection blade, and the distance member comprises a detection screw rod rotatably arranged on a rotating disc, the cathode is threadedly connected to the screw rod, and the rotating disc is provided with a power member having an output end connected to the detection screw rod, and the power member is electrically connected to the counting member.

[0037] By using the above technical scheme, when the counting member detects that the detection blade rotates a certain number of times, it is determined that there is more or less wastewater in the electrolysis tank, and a signal is transmitted to the power member, which drives the detection screw rod to rotate. Since the cathode is threadedly connected to the detection screw rod, the cathode slides on the rotating disc, thereby adjusting the distance between the cathode and the anode. When the detection member detects that there is more wastewater in the electrolysis tank, the rotating speed of the power member slows down, the adjustment period becomes longer, that is, the interval time of the power member driving the detection screw rod to rotate becomes longer, so that the distance adjustment frequency between the cathode and the anode is reduced; when the detection member detects that there is less wastewater in the electrolysis tank, the rotating speed of the power member becomes faster, so that the adjustment period becomes shorter, that is, the interval time of the power member driving the detection screw rod to rotate becomes shorter, so that the distance adjustment frequency between the cathode and the anode is increased.

[0038] The application also discloses an electroplating wastewater treatment method, which comprises the following steps:

[0039] S1, sewage into the pool, periodically generated electroplating wastewater is discharged into the sewage pool for temporary storage, and the wastewater in the sewage pool is pumped into the electrolysis tank through the water inlet, at this time, the sewage impacts the detection blade to rotate, and the number of rotations of the detection blade is counted by the counting member, so that the sewage inflow at this time is obtained, and the rotation of the power member is adjusted according to the sewage inflow at this time;

[0040] S2, quantitative flocculant, when the sewage impacts the detection blade to rotate, the detection blade drives the feeding wheel to rotate, the containing groove on the feeding wheel rotates to correspond to the feeding tank, the flocculant in the containing groove falls into the feeding tank, the more the number of rotations of the detection blade, the more the number of rotations of the feeding blade, and the more the flocculant entering the feeding tank, so that the quantitative flocculant is put into the quantitative wastewater.

[0041] S3, electrolytic flocculation, after the sewage completely enters the electrolytic tank, the rotation of the rotating disc is driven by the rotation power of the disc, and the cathode and the anode are electrified at this time, the two electrodes electrolyze the wastewater in the electrolytic tank, and the hydroxide of the heavy metal is precipitated, and the power source of the rotating disc drives the conveying impeller in the first and second communication pipes at the same time, and the wastewater in the electrolytic cell is pumped into the flocculation tank, and the rotating disc drives the feeding plate to slide periodically, so that the flocculant in the feeding tank is poured into the flocculation tank to flocculate the precipitate, and the scraper and the hole cleaning roller are driven to rotate, the filter holes on the flocculation plate are scraped and cleaned, the clogging of the flocculation material is reduced, the flocculation material is filtered, and the filtered wastewater is pumped into the electrolytic tank for electrolysis again;

[0042] S4, electrode adjustment, the detection screw is driven to rotate by the power element, so that the distance between the cathode and the anode is adjusted, and as the electrolysis proceeds, the distance between the cathode and the anode becomes smaller, until the distance between the cathode and the anode reaches the minimum distance;

[0043] S5, wastewater discharge, the reading of the conductivity detector opens the electromagnetic valve, when the conductivity of the wastewater decreases to the standard, the electromagnetic valve is opened, and the treated wastewater is discharged;

[0044] S6, filter plate cleaning, after each electrolytic flocculation is completed, the rotating plate is rotated to the fixed position, the filter plate is taken out from the flocculation tank, and the filter plate is cleaned and dried for the next wastewater treatment.

[0045] In summary, the present application has at least one of the following beneficial technical effects:

[0046] 1. By setting the counting element, power element and detection screw, when the counting element detects that the detection blade rotates a certain number of turns, it is judged that the wastewater in the electrolytic tank is more or less, and the signal is transmitted to the power element, the power element drives the detection screw to rotate, and since the cathode is matched with the detection screw thread, the cathode slides on the rotating disc, and the distance between the cathode and the anode is adjusted. When the detection element detects that the wastewater in the electrolytic tank is more, the speed of the power element is slower, the adjustment period is longer, that is, the interval time of the power element driving the detection screw to rotate is longer, so that the distance between the cathode and the anode is adjusted at a lower frequency; when the detection element detects that the wastewater in the electrolytic tank is less, the speed of the power element is faster, so that the adjustment period is shorter, that is, the interval time of the power element driving the detection screw to rotate is shorter, so that the distance between the cathode and the anode is adjusted at a higher frequency, and the distance between the cathode and the anode is adjusted according to the water inflow of the wastewater;

[0047] 2. By using a rotating disk and electrode head, the wastewater is rotated and stirred during the electrolysis process. The eddy current generated by the rotation makes the current density distribution on the electrode surface more uniform, avoiding local hydrogen evolution or passivation caused by edge effects in traditional electrolysis.

[0048] 3. At the same time, the scraper and perforation roller are used to clean the filter holes of the flocculation plate during the flocculation process, thereby improving the flocculation filtration efficiency. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure of the electroplating wastewater treatment equipment in the embodiments of this application;

[0050] Figure 2 It is along Figure 1 Schematic diagram of the cross-sectional structure along line AA;

[0051] Figure 3 yes Figure 2 A magnified view of part D in the middle;

[0052] Figure 4 yes Figure 1 Schematic diagram of the cross-sectional structure of the middle BB line;

[0053] Figure 5 yes Figure 4 A magnified view of part E in the middle;

[0054] Figure 6 yes Figure 1 Schematic diagram of the cross-sectional structure of the CC line.

[0055] Reference numerals: 1. Processing tank; 11. Baffle plate; 12. Electrolysis tank; 13. Flocculation tank; 14. Inlet; 2. Electrolysis assembly; 21. Rotating disc; 22. Electrode head; 221. Cathode; 222. Anode; 23. Distance element; 231. Detection screw; 232. Power element; 233. Counting element; 3. Flocculation assembly; 31. Flocculation plate; 311. Flocculation splicing plate; 312. Disassembly port; 32. Feeding box; 33. Filter hole; 34. Additive; 341. Feeding box; 342. Feeding port; 343. Feeding wheel; 344. Receiving tank 345. Drive wheel; 35. Feeding plate; 36. Co-moving component; 37. Feeding port; 4. Detection component; 41. Detection blade; 43. Drive wheel; 5. Scraping component; 51. Scraper; 52. Rotating rod; 53. Hole cleaning roller; 54. Hole cleaning head; 55. Co-moving gear ring; 56. Co-moving gear; 6. First connecting pipe; 61. Second connecting pipe; 62. Conveying component; 621. Conveying impeller; 63. Liquid outlet; 64. Solenoid valve; 65. Conductivity detector; 66. Conveying wheel; 67. Conveying belt; 68. First bevel gear; 69. Second bevel gear. Detailed Implementation

[0056] The application will be described in detail below with reference to the accompanying drawings. Figures 1-6 The specific embodiments of the electroplating wastewater treatment equipment of the application will be described in detail.

[0057] As shown in Figure 1 and Figure 2 , the electroplating wastewater treatment equipment of the application mainly comprises a treatment box 1 arranged vertically and fixedly, a partition plate 11 arranged horizontally and fixedly connected in the treatment box 1, the partition plate 11 divides the inner cavity of the treatment box 1 into an electrolysis box 12 and a flocculation box 13 arranged in sequence in the height direction, and the flocculation box 13 is located at the bottom side of the electrolysis box 12. In consideration of the stability during transportation and storage of the treatment equipment, the treatment box 1 is in the shape of a rectangular body outside and a circular cavity inside.

[0058] The top side of the electrolysis box 12 is provided with a water inlet 14 for introducing the electroplating wastewater to be treated into the electrolysis box 12. The electrolysis box 12 is provided with an electrolysis assembly 2, which comprises a rotating disc 21 rotatably arranged on the electrolysis box 12, an electrode head 22 arranged on the rotating disc 21 and extending into the electrolysis box 12, and a driving member for rotating the rotating disc 21. In the present application, the driving member is a motor.

[0059] Referring to Figure 3 and Figure 4 , the electrode head 22 comprises a cathode 221 and an anode 222 arranged on the rotating disc 21. The cathode 221 is slidingly arranged on the rotating disc 21, and the sliding direction of the cathode 221 is consistent with the radial direction of the rotating disc 21. The rotating disc 21 is further provided with a distance member 23 for periodically adjusting the distance between the cathode 221 and the anode 222.

[0060] In order to detect the water inflow in the electrolysis box 12, a detection member 4 for detecting the water inflow is arranged at the inlet. The detection member 4 comprises a detection blade 41 rotatably arranged at the inlet. The rotation axis of the detection blade 41 is horizontal, and the detection blade 41 is in contact with the wastewater. When the wastewater enters the electrolysis box 12 from the inlet, it will impact the detection blade 41 to make it rotate. A rotating rod 52 is arranged at the rotation shaft of the detection blade 41. The rotation of the detection blade 41 can reflect the size of the water inflow.

[0061] Specifically, referring to Figure 5 and Figure 6The detection blade 41 is provided with a counting member 233 (a rotary encoder in the present application) for counting the number of rotations of the detection blade 41. The distance member 23 comprises a detection screw 231 rotatably arranged on the rotating disc 21, the rotation axis of the detection screw 231 is parallel to the sliding direction of the cathode 221, the cathode 221 is threadedly fitted on the detection screw 231, and the rotating disc 21 is provided with a power member 232 (a servo motor in the present application) having an output end connected with the detection screw 231, and the power member 232 is electrically connected with the counting member 233. When the counting member 233 detects that the detection blade 41 rotates a certain number of times, that is, when it is judged that the wastewater in the electrolytic tank 12 is more or less, a signal is transmitted to the power member 232, the power member 232 drives the detection screw 231 to rotate, since the cathode 221 is threadedly fitted on the detection screw 231, the cathode 221 slides on the rotating disc 21, and thus the distance between the cathode 221 and the anode 222 is adjusted. When the detection member 4 detects that the wastewater in the electrolytic tank 12 is more, the rotating speed of the power member 232 becomes slower, the adjustment period becomes longer, that is, the interval time of the power member 232 driving the detection screw 231 to rotate becomes longer, so that the distance adjustment frequency between the cathode 221 and the anode 222 is reduced; when the detection member 4 detects that the wastewater in the electrolytic tank 12 is less, the rotating speed of the power member 232 becomes faster, so that the adjustment period becomes shorter, that is, the interval time of the power member 232 driving the detection screw 231 to rotate becomes shorter, so that the distance adjustment frequency between the cathode 221 and the anode 222 is increased.

[0062] The flocculation assembly 3 is arranged in the flocculation tank 13, and comprises a plurality of flocculation plates 31 arranged in the flocculation tank 13, a feeding tank 32 arranged on one side of the flocculation tank 13, and a scraping member 5 for scraping the flocculation material on the flocculation plates 31. The flocculation plates 31 are densely provided with filter holes 33 for filtering the wastewater, and the diameters of the filter holes 33 arranged on the plurality of flocculation plates 31 gradually decrease, so that the wastewater can be gradually filtered to remove impurities of different sizes when passing through the plurality of flocculation plates 31. The feeding tank 32 stores flocculants, and further comprises an adding member 34 for adding the flocculants.

[0063] The additive 34 includes a feeding box 341 located on the bottom side of the feeding box 32. A feeding port 342 is provided at the connection between the feeding box 32 and the feeding box 341. The feeding box 341 has a feeding port 37 that communicates with the flocculation box 13. A feeding wheel 343 is rotatably provided at the feeding port 342. The feeding wheel 343 has a receiving groove 344 for placing flocculant. Multiple sets of receiving grooves 344 are provided and evenly distributed along the outer peripheral wall of the feeding wheel 343. The feeding wheel 343 can be used to seal the feeding port 342. The feeding wheel 343 is connected to the detection blade 41 via a transmission mechanism. This transmission can be achieved through common methods such as gear transmission or chain transmission. In this application, a belt drive is used. The detection blade 41 has a drive wheel 43 at its shaft, and the feeding wheel 343 has a transmission wheel 345 at its shaft. When the detection blade 41 rotates, it drives the feeding wheel 343 to rotate, causing the flocculant in the receiving tank 344 to fall into the feeding box 341 through the feeding port 342, and then into the flocculation box 13 through the feeding port 37. When the detection element 4 detects a large amount of wastewater in the electrolysis tank 12, the detection blade 41 rotates faster, driving the feeding wheel 343 to rotate faster, resulting in a larger amount added to the feeding box 32. Conversely, when the detection element 4 detects a small amount of wastewater in the electrolysis tank 12, the detection blade 41 rotates slower, driving the feeding wheel 343 to rotate slower, resulting in a smaller amount added to the feeding box 32.

[0064] A feeding plate 35 is slidably installed at the feeding port 37. The feeding plate 35 can be used to block the feeding port 37. The sliding cycle of the feeding plate 35 is related to the rotation cycle of the rotating disk 21. The flocculation box 13 is provided with a co-moving member 36 for synchronizing the rotation of the rotating disk 21 and the feeding plate 35. In this application, the co-moving member 36 is driven by a combination of gear and rack transmission and linkage mechanism, thereby driving the feeding plate 35 to slide up and down along the height direction of the treatment box 1.

[0065] The rotating rod 52 of the rotating disk 21 passes through the partition 11 and the flocculation plate 31. The scraping component 5 includes a scraper 51 on the rotating rod 52 and a perforated roller 53 on the rotating rod 52. There are multiple sets of scraping components 5, and each set of scraping components 5 corresponds to a set of flocculation plates 31.

[0066] The scraper 51 is located at the bottom side of the flocculation plate 31 for scraping the flocculation material at the bottom side of the flocculation plate 31; the hole cleaning roller 53 is located at the top side of the flocculation plate 31, the hole cleaning roller 53 is rotationally arranged on the rotating rod 52, and the rotation axis of the hole cleaning roller 53 is perpendicular to the rotating rod 52, and a plurality of hole cleaning heads 54 are arranged on the hole cleaning roller 53 and movably inserted into the filter holes 33. A same-motion gear ring 55 is arranged on the inner wall of the flocculation tank 13, and a same-motion gear 56 is arranged on the hole cleaning roller 53, and the same-motion gear 56 is engaged with the same-motion gear ring 55. When the rotating rod 52 rotates, the scraper 51 and the hole cleaning roller 53 are driven to rotate, and at the same time, the hole cleaning roller 53 rotates due to the engagement of the same-motion gear 56 and the same-motion gear ring 55, the hole cleaning heads 54 are inserted into the filter holes 33 to clean the filter holes 33, and the filter holes 33 are prevented from being blocked.

[0067] The first communication pipe 6 and the second communication pipe 61 are arranged between the electrolysis tank 12 and the flocculation tank 13, one end of the first communication pipe 6 is communicated with the bottom side of the electrolysis tank 12, the other end of the first communication pipe 6 is communicated with the bottom side of the flocculation tank 13, one end of the second communication pipe 61 is communicated with the top side of the electrolysis tank 12, and the other end of the second communication pipe 61 is communicated with the top side of the flocculation tank 13. The first communication pipe 6 is used for discharging the wastewater in the electrolysis tank 12 into the flocculation tank 13, the second communication pipe 61 is used for discharging the wastewater in the flocculation tank 13 into the electrolysis tank 12, and the wastewater is circulated between the electrolysis tank 12 and the flocculation tank 13 to improve the treatment effect. The first communication pipe 6 and the second communication pipe 61 are both provided with a conveying member 62 for conveying liquid.

[0068] The conveying member 62 includes a conveying impeller 621 rotationally arranged in the first communication pipe 6 / second communication pipe 61, a conveying wheel 66 is arranged on the rotating shaft of the conveying impeller 621, the conveying wheel 66 is drivingly connected with a first bevel gear 68 through a conveying belt 67, a second bevel gear 69 is arranged at the bottom side of the rotating rod 52, and the first bevel gear 68 is engaged with the second bevel gear 69. Thus, the wastewater is conveyed in the first communication pipe 6 and the second communication pipe 61 through the driving of the first bevel gear 68, the second bevel gear 69 and the conveying wheel 66.

[0069] The second communication pipe 61 is also provided with a liquid outlet 63, the liquid outlet 63 is provided with an electromagnetic valve 64, and the electrolysis tank 12 is provided with a conductivity detector 65, and the conductivity detector 65 is electrically connected with the electromagnetic valve 64. When the conductivity detector 65 detects that the conductivity of the wastewater in the electrolysis tank 12 reaches a set value, that is, the wastewater treatment is qualified, a signal is transmitted to the electromagnetic valve 64, the electromagnetic valve 64 is opened, and the treated wastewater is discharged from the liquid outlet 63.

[0070] The flocculation plate 31 comprises two oppositely arranged flocculation plates 311, and the side wall of the flocculation box 13 is provided with a dismounting opening 312, and the flocculation plates 311 are slidably arranged at the dismounting opening 312. When it is necessary to clean or replace the flocculation plate 31, the flocculation plates 311 can be slid out of the dismounting opening 312, thereby facilitating operation.

[0071] The application further discloses a method for treating electroplating wastewater, comprising the following steps: S1, sewage inlet, periodically generated electroplating wastewater is discharged into a sewage pool for temporary storage, and the wastewater in the sewage pool is pumped into the electrolysis box 12 through the water inlet 14, at this time, the sewage impact detection blade 41 rotates, the number of rotation of the detection blade 41 is counted by the counting member 233, so that the sewage inlet amount at this time is obtained, and the rotation of the power member 232 is adjusted according to the sewage inlet amount at this time;

[0072] S2, flocculant quantification, when the sewage impact detection blade 41 rotates, the detection blade 41 drives the feeding wheel 343 to rotate, when the containing groove 344 on the feeding wheel 343 rotates to correspond to the feeding box 341, the flocculant in the containing groove 344 falls into the feeding box 341, the more the number of rotation of the detection blade 41, the more the number of rotation of the feeding blade, and the more the flocculant entering the feeding box 341, so that the quantitative flocculant is put into the quantitative wastewater;

[0073] S3, electrolysis and flocculation, after the sewage completely enters the electrolysis box 12, at this time, the rotation of the rotating disc 21 is driven by the rotation power of the rotating disc 21, and the cathode 221 and the anode 222 are electrified at this time, the two electrodes electrolyze the wastewater in the electrolysis box 12, and the hydroxide of heavy metal is precipitated, at the same time, the power source of the rotating disc 21 drives the conveying impeller 621 in the first communication pipe 6 and the second communication pipe 61 to pump the wastewater after electrolysis in the electrolytic cell into the flocculation box 13, when the rotating disc 21 rotates, the feeding plate 35 is periodically slid, so that the flocculant in the feeding box 341 is put into the flocculation box 13 to flocculate the precipitate, at the same time, the scraper 51 and the hole cleaning roller 53 are driven to rotate to scrape and clean the filter holes 33 on the flocculation plate 31, reduce the blockage of the flocculation material, filter the flocculation material, and pump the filtered wastewater into the electrolysis box 12 again for electrolysis;

[0074] S4, electrode adjustment, the detection screw 231 is driven to rotate by the power member 232, so that the distance between the cathode 221 and the anode 222 is adjusted, with the electrolysis, the distance between the cathode 221 and the anode 222 becomes smaller, until the distance between the cathode 221 and the anode 222 reaches the minimum distance;

[0075] S5, waste water discharge, the reading of the conductive detector 65 opens the electromagnetic valve 64, when the conductivity of the waste water reduces to the standard, the electromagnetic valve 64 opens at this time, and the treated waste water is discharged;

[0076] S6, filter plate cleaning, after each electrolytic flocculation is finished, the rotating plate is rotated to the fixed position, the filter plate is taken out from the flocculation tank 13, and is cleaned and dried to be prepared for the next waste water treatment.

[0077] In summary, the electroplating waste water treatment equipment of the application processes the electroplating waste water by combining electrolysis and flocculation, automatically adjusts the working parameters of the electrolysis assembly 2 and the flocculation assembly 3 according to the change of the waste water amount, improves the processing efficiency and effect, and has reasonable equipment structure and convenient operation.

[0078] The above are preferred embodiments of the application, and do not limit the protection scope of the application, so: equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. An electroplating wastewater treatment device, characterized in that: The utility model relates to a vertical arrangement treatment box (1), the treatment box (1) is equipped with the baffle (11), the treatment box (1) is divided into electrolytic tank (12) and flocculation tank (13) by the baffle (11) and is arranged in sequence along the height direction, the flocculation tank (13) is located the bottom side of electrolytic tank (12), the top side of electrolytic tank (12) is equipped with water inlet (14), and electrolytic assembly (2) is equipped on electrolytic tank (12), and the flocculation tank (13) is equipped with flocculation assembly (3) in, The electrolytic assembly (2) includes a rotating disc (21) rotatably arranged on the electrolytic tank (12), an electrode head (22) arranged on the rotating disc (21) and extending into the electrolytic tank (12), and a driving member for rotatingly driving the electrode head (22), the electrode head (22) includes a cathode (221) arranged on the rotating disc (21) and an anode (222), the cathode (221) is slidingly arranged on the rotating disc (21), and the rotating disc (21) is further provided with a distance member (23) for periodically adjusting the distance between the cathode (221) and the anode (222); The flocculation assembly (3) includes a plurality of flocculation plates (31) arranged in the flocculation tank (13), a feeding tank (32) arranged on one side of the flocculation tank (13), and a scraping member (5) for scraping the flocculation material on the flocculation plate (31), the flocculation plate (31) is densely provided with filter holes (33) for filtering sewage, and the diameters of the filter holes (33) arranged on the plurality of flocculation plates (31) gradually decrease, the feeding tank (32) stores a flocculating agent, and the feeding tank (32) is further provided with an adding member (34) for adding the flocculating agent; The electrolytic tank (12) is provided with a water inlet (14) on the top side, and the water inlet (14) is provided with a detection member (4) for detecting the water inlet amount; When the detection member (4) detects that there is more wastewater in the electrolytic tank (12), the adjustment period of the distance member (23) becomes longer, and the adding amount of the feeding tank (32) becomes larger; When the detection member (4) detects that there is less wastewater in the electrolytic tank (12), the adjustment period of the distance member (23) becomes shorter, and the adding amount of the feeding tank (32) becomes smaller; The detection piece (4) comprises a detection blade (41) rotatably arranged at the water inlet (14), which is in contact with the wastewater; the adding piece (34) comprises a feeding tank (341) arranged at the bottom side of the feeding box (32); a feeding opening (342) is arranged at the connection between the feeding box (32) and the feeding tank (341); a feeding opening (37) in communication with the flocculation tank (13) is arranged on the feeding tank (341); a feeding wheel (343) is rotatably arranged at the feeding opening (342); a containing groove (344) for placing flocculants is arranged on the feeding wheel (343); a plurality of groups of containing grooves (344) are uniformly arranged along the outer peripheral wall of the feeding wheel (343); the feeding wheel (343) movably blocks the feeding opening (342); and the feeding wheel (343) is in transmission connection with the detection blade (41). A feeding plate (35) is slidably arranged at the feeding opening (37); the feeding plate (35) movably blocks the feeding opening (37); the sliding period of the feeding plate (35) is associated with the rotation period of the rotating disc (21); and the flocculation tank (13) is provided with a synchronous movement piece (36) for synchronously moving the rotating disc (21) and the feeding plate (35). The rotating rod (52) of the rotating disc (21) penetrates through the partition plate (11) and the flocculation plate (31); the scraping piece (5) comprises a scraper (51) arranged on the rotating rod (52) and a hole cleaning roller (53) arranged on the rotating rod (52); a plurality of groups of scraping pieces (5) are in one-to-one correspondence with a plurality of groups of flocculation plates (31); the scraper (51) is located at the bottom side of the flocculation plate (31); the hole cleaning roller (53) is located at the top side of the flocculation plate (31); the hole cleaning roller (53) is rotatably arranged on the rotating rod (52); the rotation axis of the hole cleaning roller (53) is perpendicular to the rotating rod (52); a plurality of hole cleaning heads (54) are arranged on the hole cleaning roller (53); the hole cleaning heads (54) are movably inserted into the filter holes (33); a synchronous gear ring (55) is arranged on the inner wall of the flocculation tank (13); a synchronous gear (56) is arranged on the hole cleaning roller (53); and the synchronous gear (56) is in meshing connection with the synchronous gear ring (55).

2. The electroplating wastewater treatment apparatus according to claim 1, characterized by: The electrolytic tank (12) and the flocculation tank (13) are provided with a first communication pipe (6) and a second communication pipe (61), one end of the first communication pipe (6) is communicated with the bottom side of the electrolytic tank (12), the other end of the first communication pipe (6) is communicated with the bottom side of the flocculation tank (13), one end of the second communication pipe (61) is communicated with the top side of the electrolytic tank (12), the other end of the second communication pipe (61) is communicated with the top side of the flocculation tank (13), the first communication pipe (6) is used for discharging the wastewater in the electrolytic tank (12) into the flocculation tank (13), the second communication pipe (61) is used for discharging the wastewater in the flocculation tank (13) into the electrolytic tank (12), and the first communication pipe (6) and the second communication pipe (61) are provided with conveying elements (62) for conveying liquid.

3. The electroplating wastewater treatment apparatus according to claim 2, characterized by: The conveying element (62) comprises a conveying impeller (621) rotatably arranged in the first communication pipe (6) / second communication pipe (61), a conveying wheel (66) is arranged on the rotating shaft of the conveying impeller (621), the rotating rod (52) is provided with a first bevel gear (68), and a transmission structure is arranged between the first bevel gear (68) and the conveying wheel (66).

4. The electroplating wastewater treatment apparatus according to claim 3, wherein: The second communication pipe (61) is further provided with a liquid outlet (63), the liquid outlet (63) is provided with an electromagnetic valve (64), the electrolytic tank (12) is provided with a conductivity detector (65), and the conductivity detector (65) is electrically connected with the electromagnetic valve (64).

5. The electroplating wastewater treatment apparatus according to claim 4, wherein: The flocculation plate (31) comprises two flocculation splicing plates (311) arranged in opposite splicing modes, and the side wall of the flocculation tank (13) is provided with a dismounting opening (312), and the flocculation splicing plate (311) is slidingly arranged at the dismounting opening (312).

6. The electroplating wastewater treatment apparatus according to claim 5, wherein: The rotating shaft of the detection blade (41) is provided with a counting element (233) for counting the number of rotations of the detection blade (41), the distance element (23) comprises a detection lead screw (231) rotatably arranged on a rotating disc (21), the cathode (221) is threadedly fitted on the detection lead screw (231), and the rotating disc (21) is provided with a power element (232) connected with the detection lead screw (231), and the power element (232) is electrically connected with the counting element (233).

7. A method for treating electroplating wastewater, based on the electroplating wastewater treatment device according to claim 6, characterized in that: The method comprises the following steps: S1, sewage into the pool, periodically generated electroplating wastewater is discharged into the sewage pool for temporary storage, and the wastewater in the sewage pool is pumped into the electrolytic tank (12) through the water inlet (14), at this time, the sewage impacts the detection blade (41) to rotate, the number of rotations of the detection blade (41) is counted by the counting element (233), so that the sewage inflow at this time is obtained, and the rotation of the power element (232) is adjusted according to the sewage inflow at this time. S2, the flocculant is quantified, when the sewage impact detection blade (41) rotates, the detection blade (41) drives the feeding wheel (343) to rotate, the containing groove (344) on the feeding wheel (343) rotates to correspond to the feeding box (341), the flocculant in the containing groove (344) falls into the feeding box (341), the more the number of rotations of the detection blade (41), the more the number of rotations of the feeding blade, the more the flocculant in the feeding box (341), so that the quantitative flocculant is put into the quantitative wastewater; S3, electrolytic flocculation, after the sewage completely enters the electrolytic tank (12), the rotating disc (21) is driven to rotate by the rotating power at this time, and the cathode (221) and the anode (222) are electrified at this time, the two electrodes electrolyze the wastewater in the electrolytic tank (12), and the precipitate of the hydroxide of the heavy metal is generated, and the power source of the rotating disc (21) drives the delivery impeller (621) in the first communication pipe (6) and the second communication pipe (61) at the same time, the wastewater after electrolysis in the electrolytic cell is pumped into the flocculation tank (13), when the rotating disc (21) rotates, the feeding plate (35) is periodically slid, so that the flocculant in the feeding box (341) is put into the flocculation tank (13) to flocculate the precipitate, at the same time, the scraper (51) and the hole cleaning roller (53) are driven to rotate, the filter hole (33) on the flocculation plate (31) is scraped and cleaned, the clogging of the flocculation material is reduced, the flocculation material is filtered, and the filtered wastewater is pumped into the electrolytic tank (12) again for electrolysis; S4, electrode adjustment, the detection screw (231) is driven to rotate by the power element (232), so that the distance between the cathode (221) and the anode (222) is adjusted, with the electrolysis, the distance between the cathode (221) and the anode (222) becomes smaller, until the distance between the cathode (221) and the anode (222) reaches the minimum distance; S5, wastewater discharge, according to the reading of the conductivity detector (65), the electromagnetic valve (64) is opened, when the conductivity of the wastewater decreases to the standard, the electromagnetic valve (64) is opened, and the treated wastewater is discharged; S6, the flocculation plate (31) is cleaned, after each electrolytic flocculation is finished, the rotating disc (21) rotates to the fixed position, the flocculation plate (31) is taken out from the flocculation tank (13), cleaned and dried for the next wastewater treatment.

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