Electroplating wastewater treatment system and method

Abstract

The invention relates to the technical field of electroplating wastewater treatment, and particularly discloses an electroplating wastewater treatment system and method.The electroplating wastewater treatment system comprises a flocculation sedimentation tank, the flocculation sedimentation tank is evenly divided into a plurality of reaction tanks, and static folded plates and dynamic folded plates are arranged in the reaction tanks at intervals; a scraping mechanism is arranged at the bevel position of the side, close to the dynamic folded plate, of the static folded plate, a linkage mechanism used for driving the scraping mechanism to conduct automatic scraping is arranged between the dynamic folded plate and the static folded plate, and a medicament releasing mechanism is arranged on the scraping mechanism. The sensor can detect the concentration of ions entering the sedimentation tank, then the dynamic folded plate is driven to ascend and descend according to the ion concentration, so that the path and the speed of electroplating wastewater passing through the space between the static folded plate and the dynamic folded plate are changed, and the problem of flocculation efficiency attenuation caused by sedimentation of the static folded plate is solved in cooperation with the scraping mechanism; the heavy metal leaching concentration of the sludge is greatly reduced, so that the treatment efficiency is greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of electroplating wastewater treatment, and in particular to an electroplating wastewater treatment system and method. Background Art

[0002] During the electroplating process, a large amount of wastewater containing heavy metal ions, organic matter and suspended solids is generated. The pollutants in the wastewater have complex components and strong toxicity. If directly discharged, it will cause serious harm to the ecological environment and human health. Currently, the mainstream treatment methods in the industry include chemical precipitation, ion exchange, membrane separation, etc. Among them, the chemical precipitation method is widely used due to its low cost and simple operation. This process usually adds a flocculant to form hydroxide flocs of heavy metal ions, and then realizes solid-liquid separation in a sedimentation tank. However, the flocculation reaction efficiency and sedimentation stability directly determine the heavy metal removal effect, and the structural design of the flocculation tank is the key factor affecting this process.

[0003] The invention patent with the publication number CN105540951A discloses an electroplating chromium-containing wastewater treatment system and method, which mentions that chemical precipitation will generate precipitates during the reaction process and needs to be removed by sedimentation in a sedimentation tank. To ensure the sedimentation effect, a relatively large amount of flocculant is often added to the sedimentation.

[0004] Traditional electroplating wastewater flocculation tanks mostly adopt the folded-plate flocculation process. By combining the layout of corrugated plates with different waves, same waves and straight plates, water flow turbulence is formed to promote the collision and combination of flocculants and pollutants. The corrugated plates with different waves generate high shear rates through the alternately contracting-expanding flow channel design to accelerate the destabilization of colloidal particles; the corrugated plates with the same waves promote the gradual growth of small flocs through a stable vortex flow field; the straight plate section is used to slow down the water flow velocity to avoid the breakage of flocs. Although this "different wave - same wave - straight plate" three-stage layout can achieve hierarchical flocculation, its static structure has limited adaptability to water quality fluctuations, and fluid stagnation areas are easily formed at the bends of the folded plates, resulting in the deposition of flocs or unreacted particles.

[0005] Although the folded-plate flocculation process is widely used in electroplating wastewater treatment, there are still the following problems in practice: 1. At the bends of the folded plates, due to the sudden change in flow pattern, flocs and sediments are easily accumulated. After long-term operation, the thickness of the sediment increases, changing the geometric shape of the flow channel, resulting in the attenuation of turbulence intensity and significantly weakening the flocculation efficiency; 2. The folded-plate layout is difficult to achieve the dynamic interaction between the medicament and the sediment. Some medicaments become ineffective due to too high or too low local concentrations, resulting in unstable treatment effects of existing flocculation tanks on high-concentration and highly volatile electroplating wastewater. Summary of the Invention

[0006] To solve the defects of the conventional folded plates mentioned above, this application provides an electroplating wastewater treatment system and method.

[0007] The present application provides an electroplating wastewater treatment system, which adopts the following technical solution:

[0008] A system for treating electroplating wastewater, comprising a flocculation sedimentation tank, wherein the flocculation sedimentation tank is evenly divided into a plurality of reaction tanks, adjacent linear reaction tanks are interconnected, static folding plates and dynamic folding plates are arranged at intervals in the reaction tanks, a sensor for detecting ion concentration in electroplating wastewater is arranged on the static folding plate near the water inlet end of the reaction tank, the dynamic folding plate is arranged between the two static folding plates, and mounting plates are fixed at both ends of the dynamic folding plate, the two mounting plates are slidably mounted on the side walls of the reaction tank, and a lifting mechanism for driving the two mounting plates to rise and fall is installed on the top of the reaction tank;

[0009] A scraping mechanism for scraping off the precipitate is arranged at the folded corner of the static folding plate close to the dynamic folding plate, a linkage mechanism for driving the scraping mechanism to automatically scrape is arranged between the dynamic folding plate and the static folding plate, and a drug releasing mechanism for reacting the scraped precipitate is also arranged on the scraping mechanism, and when the scraping mechanism is actuated, the drug releasing mechanism automatically releases the drug.

[0010] By adopting the above technical solution, this solution divides the flocculation sedimentation tank into several reaction tanks, and alternately sets static folding plates and dynamic folding plates therein, combines sensors to detect the ion concentration in electroplating wastewater in real time, drives the lifting mechanism to adjust the height of the dynamic folding plates, and combines the static folding plates to form a variable flow channel. When the influent concentration suddenly increases, the adaptability of the dynamic folding plates is improved, the water flow velocity changes, the turbulence intensity increases, and the diffusion boundary layer of the reagent is forcibly broken, so that the reagent and the wastewater are fully mixed. And through periodic lifting and lowering, the cross-sectional area of ​​the flow channel can be dynamically changed, the "dead water area" of the traditional fixed folding plates can be eliminated, and the coefficient of variation of the reagent concentration distribution can be reduced.

[0011] The scraping mechanism at the corner of the static folding plate is synchronized with the dynamic folding plate through a linkage mechanism, and the reagent release mechanism automatically adds reagents during scraping. This design realizes the adaptive adjustment of flow pattern and the synergistic effect of scraping-reaction, so that adjacent reaction tanks form a stepped flow field through the height difference of the dynamic folding plate, solving the problem of flocculation efficiency attenuation caused by siltation of traditional folding plates, greatly reducing the concentration of heavy metal leaching in sludge and greatly improving the treatment efficiency.

[0012] Optionally, the scraping mechanism includes a rotating shaft and spiral blades coaxially arranged on the rotating shaft, and the rotating shaft and spiral blades are provided in multiple groups. Each of the rotating shafts is arranged in parallel on the static folding plate, and both ends of the rotating shaft are rotatably installed on the plate surface of the static folding plate, and one end of the rotating shaft is transmission-connected to the linkage mechanism. When the lifting mechanism drives the linkage mechanism to operate, the rotating shaft drives the spiral blades to rotate.

[0013] By adopting the above technical solution, the scraping mechanism adopts a layout of multiple sets of parallel rotating shafts and spiral blades, and the rotating shafts are connected to the dynamic folding plate through a linkage mechanism. When the dynamic folding plate is raised or lowered, the rotating shaft drives the spiral blades to rotate, and the shear force completely removes the adhesive sediment at the corner. The multi-axis design covers the surface of the static folding plate, eliminates the scraping blind area, improves the cleaning coverage of the corner, and greatly improves the scraping efficiency compared to manual cleaning, and avoids the local wear problem of the traditional single-axis scraper.

[0014] Optionally, the spiral directions of adjacent spiral blades are opposite.

[0015] By adopting the above technical solution, adjacent spiral blades adopt opposite spiral directions to form counter-currents near the static folded plate surface (boundary layer area). The counter-currents generated by the reverse spirals form micro-vortices, which destroy the adhesion conditions of the sediments, enhance the sediment suspension effect, and prevent unilateral accumulation.

[0016] Optionally, the linkage mechanism includes an active adsorption member, a passive adsorption member, a fixed pulley, a pull rope, a rack and a gear, the active adsorption member is installed on a side of the dynamic folding plate close to the static folding plate, the passive adsorption member is slidably installed on the static folding plate, and when the dynamic folding plate moves, the active adsorption member can move to face the passive adsorption member;

[0017] The fixed pulley is rotatably installed inside the static folding plate, one end of the pull rope is fixedly connected to the driven adsorption member, and the other end is wound around the fixed pulley and connected to the end of the rack. The rack is slidably installed on the static folding plate, and the sliding direction is perpendicular to the length direction of each rotating shaft. Multiple groups of gears are provided corresponding to each of the rotating shafts, and each of the gears is coaxially fixed to the corresponding end of the rotating shaft, and the rack is meshed with each of the gears.

[0018] By adopting the above technical solution, when the dynamic folding plate moves, the active adsorption part moves to a position opposite to the driven adsorption part. At this time, the active adsorption part adsorbs the driven adsorption part, driving the pull rope to pull the rack, and the gear drives the rotating shaft to rotate, so that the spiral blade rotates to scrape and disperse the sediment.

[0019] Optionally, the diameters of adjacent gears are different, and the tooth surface height of the rack is adaptively set corresponding to the diameter of each gear.

[0020] By adopting the above technical solution, the diameters of adjacent gears are designed differently, and the height of the tooth surface of the rack is adapted to different gears to achieve variable-speed transmission, so that the rotation speeds of adjacent spiral blades are different, and thus the rotation speeds of the liquids driven by the rotation of adjacent spiral blades are different, thereby forming a peak area of turbulent kinetic energy in the intersection area between adjacent spiral blades. The turbulent kinetic energy generated by the velocity gradient secondary-crushes the caked sludge blocks or large-particle aggregates peeled by scraping, increases the reaction specific surface area, exposes more active sites on the surface of the precipitate per unit mass, enables the crushed fine-particle precipitate to react with the medicament more thoroughly, and reduces the heavy metal residue caused by the encapsulation effect.

[0021] Optionally, the medicament release mechanism includes a medicine loading cylinder and an outer protection cylinder. The medicine loading cylinder is filled with medicament, and the medicine loading cylinder rotates coaxially and fits against the inner wall of the outer protection cylinder. A plurality of medicine outlet holes are opened on both the medicine loading cylinder and the outer protection cylinder. A torsion spring is arranged between the bottom of the outer protection cylinder and the bottom of the medicine loading cylinder. The medicine outlet holes on the medicine loading cylinder and the outer protection cylinder are aligned during the rotation of the spiral blade.

[0022] By adopting the above technical solution, the medicament release mechanism controls the medicament release through the misaligned rotation of the medicine loading cylinder and the outer protection cylinder. When the spiral blade rotates, the medicine loading cylinder is aligned with the medicine outlet hole of the outer protection cylinder under the action of the torsion spring, and the medicament is accurately sprayed onto the scraping surface; during the non-working period, the medicine outlet hole is closed to prevent the medicament from getting damp and caking.

[0023] Optionally, both the outer protection cylinder and the medicine loading cylinder are provided with opening and closing structures for loading and replacing the medicament.

[0024] By adopting the above technical solution, the quick-release opening and closing structure of the outer protection cylinder and the medicine loading cylinder supports modular replacement and addition of the medicament, and is convenient for subsequent cleaning.

[0025] Optionally, the lifting mechanism includes a screw rod and a driving member. The screw rod is rotatably installed in the mounting plate, and a thread groove adapted to the screw rod is opened in the mounting plate. The driving member is installed at the top of the reaction tank, and the output end is coaxially fixed to the screw rod.

[0026] By adopting the above technical solution, the lifting mechanism uses the cooperation of screw rod drive and thread groove, so that the screw rod can drive the mounting plate to lift and lower, realizing the lifting control of the dynamic baffle.

[0027] This application also provides an electroplating wastewater treatment method, which is applied to the electroplating wastewater treatment system described above, and includes the following steps:

[0028] S1: The sensor detects the ion concentration in the electroplating wastewater entering the reaction tank, and the driving member drives the dynamic baffle to lift and lower at a corresponding rate;

[0029] S2: The active suction attachments on the dynamic folding plate drive the driven suction attachments to move during the lifting process, causing the rotating shaft to drive the spiral blade to rotate, scraping and dispersing the sediment accumulated at the folding angle of the static folding plate;

[0030] S3: When the spiral blade rotates, it drives the medicine cartridge to rotate. The medicine in the medicine cartridge contacts the surface of the scraped sediment through the medicine outlet hole, promoting the positive progress of flocculation.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. In this solution, the flocculation sedimentation tank is divided into several reaction tanks, and static folding plates and dynamic folding plates are alternately arranged therein. The ion concentration in the electroplating wastewater is detected in real time by a sensor, and the lifting mechanism is driven to adjust the height of the dynamic folding plate to dynamically switch the flow state of different waves / same waves. The scraping mechanism at the folding angle of the static folding plate is synchronized with the movement of the dynamic folding plate through a linkage mechanism, and the medicine release mechanism automatically adds medicine during scraping. This design realizes the adaptive adjustment of the flow state and the synergistic effect of scraping - reaction, solves the problem of the attenuation of flocculation efficiency caused by siltation in traditional folding plates, greatly reduces the leaching concentration of heavy metals in sludge, and greatly improves the treatment efficiency;

[0033] 2. The adjacent spiral blades are arranged with opposite spiral directions, forming a counter - flow of water near the surface of the static folding plate. The counter - flow of water generated by the reverse spiral forms micro - vortices, which destroy the attachment conditions of sediments, enhance the suspension effect of sediments, and prevent unilateral accumulation;

[0034] 3. The adjacent gears are designed with different diameters, and the height of the tooth surface of the rack is adapted to different gears to achieve variable - speed transmission, so that the rotation speeds of adjacent spiral blades are different. Thus, the rotation speeds of the liquids driven by the adjacent spiral blades are different, and a peak area of turbulent kinetic energy is formed in the intersection area between adjacent spiral blades. The turbulent kinetic energy generated by the velocity gradient secondary - breaks the compacted sludge blocks or large - particle aggregates scraped and peeled, increases the specific surface area of the reaction, exposes more active sites on the surface of the sediment per unit mass, enables the broken fine - particle sediments to react with the medicine more thoroughly, and reduces the heavy - metal residue caused by the encapsulation effect;

[0035] 4. The medicine release mechanism controls the medicine release through the misaligned rotation of the medicine cartridge and the outer protection cylinder. When the spiral blade rotates, the medicine cartridge is aligned with the medicine outlet hole of the outer protection cylinder under the action of the torsion spring, and the medicine is accurately sprayed onto the scraping surface. The medicine outlet hole is closed during the non - working period to prevent the medicine from being affected by moisture and caking. Description of the Drawings

[0036] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0037] Figure 1 is the overall structural schematic diagram of the electroplating wastewater treatment system in the embodiments of the present application;

[0038] Figure 2 is Figure 1 the structural schematic diagram of a single reaction tank in;

[0039] Figure 3 is Figure 2 the internal structural schematic diagram of a single reaction tank in;

[0040] Figure 4 is Figure 3 the side view of the static baffle plate in;

[0041] Figure 5 is Figure 4 the front view of the static baffle plate in;

[0042] Figure 6 is Figure 5 the internal structural schematic diagram at the chemical agent release mechanism in.

[0043] Reference numerals: 1, inlet tank; 2, sedimentation tank; 3, clear water discharge tank; 4, flocculation sedimentation tank; 41, reaction tank; 411, mounting plate; 412, static baffle plate; 413, dynamic baffle plate; 5, lifting mechanism; 51, screw rod; 52, driving member; 6, scraping mechanism; 61, rotating shaft; 62, spiral blade; 7, linkage mechanism; 71, driven suction member; 711, tension spring; 72, fixed pulley; 73, pulling rope; 74, rack; 75, gear; 8, chemical agent release mechanism; 81, medicine loading cylinder; 82, outer protection cylinder; 83, torsion spring; 84, medicine outlet hole. Specific embodiments

[0044] The following further elaborates on the present application in conjunction with the attached Figures 1-6 , and makes a more detailed description of the present application.

[0045] The embodiments of the present application disclose an electroplating wastewater treatment system.

[0046] Refer to Figure 1 and Figure 2A system for treating electroplating wastewater comprises an inlet pool 1, a flocculation sedimentation pool 4, a sedimentation pool 2 and a clean water discharge pool 3. The flocculation sedimentation pool 4 is evenly divided into a plurality of reaction pools 41. Adjacent linear reaction pools 41 are interconnected. Static folding plates 412 and dynamic folding plates 413 are arranged at intervals in the reaction pools 41. The static folding plates 412 are provided with a sensor for detecting the ion concentration in the electroplating wastewater near the inlet end of the reaction pool 41. The dynamic folding plate 413 is arranged between the two static folding plates 412 and mounting plates 411 are fixed at both ends of the dynamic folding plates 413. The two mounting plates 411 are slidably mounted on the side walls of the reaction pool 41. A lifting mechanism 5 for driving the two mounting plates 411 to rise and fall is installed on the top of the reaction pool 41.

[0047] Reference Figure 3 , Figure 4 and Figure 5 A scraping mechanism 6 for scraping off the precipitate is provided at the corner of the static folding plate 412 close to the dynamic folding plate 413. A linkage mechanism 7 for driving the scraping mechanism 6 to automatically scrape is provided between the dynamic folding plate 413 and the static folding plate 412. The scraping mechanism 6 is also provided with a drug releasing mechanism 8 for reacting the scraped precipitate. When the scraping mechanism 6 is in action, the drug releasing mechanism 8 automatically releases the drug.

[0048] The combined design of the static folding plate 412 and the dynamic folding plate 413 in this solution achieves the dual advantages of "steady-state foundation + dynamic optimization" in terms of flow control and reagent interaction. The static folding plate 412, as a fixed flow channel skeleton, maintains the basic turbulence intensity through standardized folding angles and spacing, ensures efficient mixing in the initial stage of the flocculation reaction, and avoids the flow disorder and energy waste caused by the continuous mechanical adjustment of the full dynamic folding plate 413.

[0049] The dynamic folding plate 413 is nested between the static folding plates 412, and the local flow channel cross-sectional area and flow velocity distribution are adjusted in real time through the lifting mechanism 5. When the sensor detects a sudden change in the inlet ion concentration or a sediment accumulation signal, the dynamic folding plate 413 can be lifted or lowered in a targeted manner to enhance the turbulent disturbance intensity in key areas, such as the high-concentration wastewater inlet, to force the agent diffusion boundary layer to break, and at the same time, the corner sediments are peeled off through the linked scraping mechanism, so that the agent can directly act on the newly exposed active sediment surface.

[0050] This "static-dynamic synergy" mode not only retains the operational stability of the static structure, but also realizes the precise adaptation of the local flow state and the reagent concentration through the dynamic module. Compared with the fully static folding plate 412, the sediment accumulation rate is greatly reduced, the uniformity of reagent diffusion is reduced, and the coefficient of variation CV can be optimized from about 35% to less than 10%.

[0051] Compared with the full-dynamic folding plate 413 solution, this design significantly reduces system complexity and energy consumption by limiting the dynamic adjustment range and triggering conditions. The dynamic folding plate 413 is triggered only under the preset threshold conditions, and the lifting range is constrained by the spacing of the static folding plate 412. It not only avoids the mechanical wear and high power consumption caused by the full-dynamic folding plate 413 due to frequent adjustment of the whole domain, but also ensures the geometric stability of the flow channel through the physical limit of the static folding plate 412, preventing the flocs from being broken due to excessive adjustment.

[0052] At the same time, the scraping mechanism 6 and the agent releasing mechanism 8 fixedly arranged at the corner of the static folding plate 412 can maintain basic cleaning and agent replenishment functions when the dynamic folding plate 413 is not activated. When the dynamic folding plate 413 is in motion, the scraping force and the agent injection amount are synchronously strengthened through the linkage mechanism 7, forming a composite mechanism of "static normal maintenance + dynamic emergency enhancement", so that the system can still maintain a pollutant removal rate of more than 95% under high-concentration impact loads, which is 40% higher than the anti-fluctuation ability of the traditional full-dynamic solution.

[0053] Specifically, refer to Figure 2 and Figure 3 The lifting mechanism 5 includes a screw 51 and a driving member 52. The screw 51 and the driving member 52 are symmetrically installed in two groups. The screw 51 is rotatably installed in the mounting plate 411, and a thread groove adapted to the screw 51 is provided in the mounting plate 411. The driving member 52 is installed on the top of the reaction pool 41, and the output end is coaxially fixed with the screw 51. The screw 51 is driven and matched with the thread groove, so that the screw 51 can drive the mounting plate 411 to rise and fall, thereby realizing the lifting and falling control of the dynamic folding plate 413.

[0054] Reference Figure 3 , Figure 4 and Figure 5 The scraping mechanism 6 includes a rotating shaft 61 and a spiral blade 62 coaxially arranged on the rotating shaft 61. There are multiple groups of rotating shafts 61 and spiral blades 62. Each rotating shaft 61 is arranged in parallel on the static folding plate 412. Both ends of the rotating shaft 61 are rotatably installed on the plate surface of the static folding plate 412, and one end of the rotating shaft 61 is transmission-connected with the linkage mechanism 7. When the lifting mechanism 5 drives the linkage mechanism 7 to operate, the rotating shaft 61 drives the spiral blade 62 to rotate.

[0055] The scraping mechanism 6 is arranged with multiple sets of parallel rotating shafts 61 and spiral blades 62, and the rotating shaft 61 is connected to the dynamic folding plate 413 through the linkage mechanism 7. When the dynamic folding plate 413 is raised or lowered, the rotating shaft 61 drives the spiral blade 62 to rotate, and the shear force completely removes the adhesive precipitation at the corner. The multi-axis design covers the surface of the static folding plate 412, eliminates the scraping blind area, improves the cleaning coverage of the corner, greatly improves the scraping efficiency compared to manual cleaning, and avoids the local wear problem of the traditional single-axis scraper.

[0056] The adjacent spiral blades 62 adopt opposite spiral directions to form a counter-flow of water near the surface of the static baffle 412 (boundary layer region). The counter-flow of water generated by the reverse spiral forms micro-vortices, which destroys the attachment conditions of sediments, enhances the suspension effect of precipitates, and prevents unilateral accumulation.

[0057] Furthermore, referring to Figure 5 , the diameters of the adjacent gears 75 are different, and the tooth surface height of the rack 74 is adaptively set corresponding to the diameters of the respective gears 75. The differential design of the diameters of the adjacent gears 75 and the adaptation of the tooth surface height of the rack 74 to different gears 75 achieve variable-speed transmission, making the rotation speeds of the adjacent spiral blades 62 different. As a result, the rotation speeds of the liquids driven by the rotation of the adjacent spiral blades 62 are different, thereby forming a peak region of turbulent kinetic energy in the intersection area between the adjacent spiral blades 62. The turbulent kinetic energy generated by the velocity gradient secondary-crushes the compacted sludge blocks or large particle aggregates scraped and peeled, increases the reaction specific surface area, exposes more active sites on the surface of the precipitate per unit mass, enables the broken fine particle precipitates to react more thoroughly with the reagent, and reduces the heavy metal residues caused by the encapsulation effect.

[0058] Referring to Figure 3 and Figure 5 , the linkage mechanism 7 includes a driving suction attachment, a driven suction attachment 71, a fixed pulley 72, a pulling rope 73, a rack 74, and gears 75. The driving suction attachment is installed on one side of the dynamic baffle 413 close to the static baffle 412. The driven suction attachment 71 is slidably installed on the static baffle 412, and when the dynamic baffle 413 moves, the driving suction attachment can move to be directly opposite to the driven suction attachment 71.

[0059] The fixed pulley 72 is rotatably installed inside the static baffle 412. One end of the pulling rope 73 is fixedly connected to the driven suction attachment 71, and the other end is wound around the fixed pulley 72 and then connected to the end of the rack 74. The rack 74 is slidably installed on the static baffle 412, and the sliding direction is perpendicular to the length direction of each rotating shaft 61. A plurality of groups of gears 75 are provided corresponding to each rotating shaft 61. Each gear 75 is coaxially fixed to the end of the corresponding rotating shaft 61, and the rack 74 meshes with each gear 75.

[0060] To facilitate the reset of the driven suction attachment 71, referring to Figure 5 , a tension spring 711 is provided at the end of the driven suction attachment 71, and a torsion spring is provided at the end of each rotating shaft 61. Both the tension spring 711 and the torsion spring can reset the driven suction attachment 71 after it is detached from the adsorption of the driving suction attachment.

[0061] When the dynamic baffle 413 moves, the driving suction attachment moves to a position directly opposite to the driven suction attachment 71. At this time, the driving suction attachment adsorbs the driven suction attachment 71, drives the pulling rope 73 to pull the rack 74, and the gear 75 drives the rotating shaft 61 to rotate, causing the spiral blade 62 to rotate and scrape and disperse the precipitate.

[0062] In this embodiment, the active adsorbing member and the driven adsorbing member 71 are arranged as columnar strong permanent magnets. In other feasible embodiments, the active adsorbing member can also be an electromagnet, or the active adsorbing member and the driven adsorbing member 71 adopt a contact transmission mode, such as a pressing and pulling contact transmission, etc.

[0063] Referring to Figure 6 , the medicament release mechanism 8 includes a medicine loading cylinder 81 and an outer protection cylinder 82. The medicine loading cylinder 81 is filled with medicaments. The medicine loading cylinder 81 rotates coaxially and fits on the inner wall of the outer protection cylinder 82. A plurality of medicine outlet holes 84 are formed on both the medicine loading cylinder 81 and the outer protection cylinder 82. A torsion spring 83 is arranged between the bottom of the outer protection cylinder 82 and the bottom of the medicine loading cylinder 81. The medicine outlet holes 84 on the medicine loading cylinder 81 and the outer protection cylinder 82 are aligned during the rotation of the spiral blade 62.

[0064] The medicament release mechanism 8 controls the release of the medicament through the misaligned rotation of the medicine loading cylinder 81 and the outer protection cylinder 82. When the spiral blade 62 rotates, the medicine loading cylinder 81 is aligned with the medicine outlet holes 84 of the outer protection cylinder 82 under the action of the torsion spring 83, and the medicament is accurately sprayed onto the scraping surface. During non-working periods, the medicine outlet holes 84 are closed to prevent the medicament from getting damp and caking.

[0065] Since traditional cleaning requires manual operation after stopping the machine for draining: Workers enter the tank body, use a high-pressure water gun to wash the surface of the static baffle 412, and at the same time use a scraper to remove stubborn lumps. Each single cleaning takes 4 - 8 hours and there are safety hazards. For large flocculation tanks, some enterprises use mechanical sludge scrapers, but the cooperation gap between the scraper and the static baffle 412 results in about 20 - 30% of the corners remaining, which requires secondary manual cleaning.

[0066] However, the spiral blade 62 in this solution can remove the precipitation and sludge on the static baffle 412, and can enter the tank body during the time of traditional cleaning to add drugs, and at the same time check whether the dynamic baffle 413 and the static baffle 412 are working properly.

[0067] It should be noted that the medicaments installed in this application can be in solid form, fluid form, or powder form. The types and quantities of the installed medicaments can also be selected differently according to the concentration of heavy metal ions contained in different electroplating wastewaters:

[0068] When the electroplating wastewater is high-cyanide wastewater, the medicament can use sodium hypochlorite as the main medicament and sodium sulfide as the auxiliary medicament. Sodium hypochlorite can oxidize and decompose cyanide complexes (such as Cu(CN)3 - , Ag(CN)2 - ), release free heavy metal ions, and thus convert highly toxic cyanide (CN - ) into non-toxic nitrogen gas (N2) and carbonate. And sodium sulfide reacts with the released Cu 2+ , Ag+ Reactions such as this generate insoluble sulfides CuS and Ag2S to prevent secondary dissolution.

[0069] Of course, the medicament in this application has an auxiliary effect. The flocculant added in the traditional method still needs to be added in this application. The medicament in this application can synergize with the traditional flocculant. The flocculant can be PAC (polyaluminum chloride). After the sodium hypochlorite breaks the complex, PAC can efficiently capture free Cu 2+ and Ag + , generating dense flocs; the sulfide precipitate and the PAC flocs co-precipitate, improving the sludge density, thereby greatly increasing the removal rate of cyanide and the enrichment degree of Cu / Ag in the sludge, making it directly smeltable.

[0070] When the electroplating wastewater is high-chromium wastewater, the medicament can use sodium thiosulfate (Na2S2O3) or ferrous sulfate (FeSO4) as the main medicament, and sodium hydroxide can be used as the auxiliary medicament. The main medicament can reduce the highly toxic Cr 6+ to low-toxic Cr 3+ , and Cr 3 + forms a Cr(OH)3 precipitate under the alkaline condition of the auxiliary medicament.

[0071] The medicament synergizes with the traditional flocculant, making the reduced Cr 3+ co-precipitate with the hydrolysis product Al 3+ of PAC to form a composite floc (Al-Cr(OH)3), thereby increasing the floc particle size and accelerating sedimentation, so that the removal rate of Cr 6+ is greatly improved, reducing the leaching concentration of Cr in the sludge to meet the landfill standard.

[0072] To facilitate medicine replacement and addition, and to facilitate subsequent cleaning of the interiors of the medicine cartridge 81 and the outer protection cylinder 82, both the outer protection cylinder 82 and the medicine cartridge 81 are provided with opening and closing structures for medicine loading and replacement. In this embodiment, the opening and closing structure realizes the disassembly and assembly of their respective ends by means of a screw cap. In other feasible embodiments, a snap-on form can also be used to realize the quick disassembly and assembly of the outer protection cylinder 82 and the medicine cartridge 81 respectively. Since this disassembly and assembly structure is relatively common, it is not shown in the drawings.

[0073] The implementation principle of the electroplating wastewater treatment system in the embodiment of the present application is as follows: In this solution, the flocculation sedimentation tank 4 is divided into several reaction tanks 41, and static baffles 412 and dynamic baffles 413 are alternately arranged therein. The ion concentration in the electroplating wastewater is detected in real time by a sensor, and the lifting mechanism 5 is driven to adjust the height of the dynamic baffle 413 to dynamically switch the hetero-wave / homo-wave flow pattern. The scraping mechanism 6 at the fold angle of the static baffle 412 operates synchronously with the dynamic baffle 413 through the linkage mechanism 7, and the chemical agent release mechanism 8 automatically adds chemical agents during scraping. This design realizes the adaptive adjustment of the flow pattern and the synergistic effect of scraping-reaction, solves the problem of the attenuation of the flocculation efficiency caused by siltation in the traditional baffle, greatly reduces the heavy metal leaching concentration of the sludge, and greatly improves the treatment efficiency.

[0074] The embodiment of the present application also discloses an electroplating wastewater treatment method, which is applied to the electroplating wastewater treatment system described above, and includes the following steps:

[0075] S1: The sensor detects the ion concentration in the electroplating wastewater entering the reaction tank 41, and the driving member 52 drives the dynamic baffle 413 to lift at a corresponding rate;

[0076] S2: The active adsorption member on the dynamic baffle 413 drives the driven adsorption member 71 to move during the lifting process, so that the rotating shaft 61 drives the spiral blade 62 to rotate, and scrapes and disperses the sediment accumulated at the fold angle of the static baffle 412;

[0077] S3: When the spiral blade 62 rotates, it drives the medicine loading cylinder 81 to rotate, and the chemical agent in the medicine loading cylinder 81 contacts the surface of the scraped sediment through the medicine outlet hole 84, promoting the positive progress of flocculation.

[0078] The above are all optional embodiments of the present application, and do not limit the protection scope of the present application accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An electroplating wastewater treatment system, comprising a flocculation sedimentation tank (4), characterized in that: The flocculation sedimentation tank (4) is evenly divided into a plurality of reaction tanks (41), and adjacent linear reaction tanks (41) are interconnected. Static folding plates (412) and dynamic folding plates (413) are arranged at intervals in the reaction tanks (41). A sensor for detecting ion concentration in electroplating wastewater is arranged on the static folding plate (412) near the water inlet end of the reaction tank (41). The dynamic folding plate (413) is arranged between the two static folding plates (412), and mounting plates (411) are fixed at both ends of the dynamic folding plate (413). The two mounting plates (411) are slidably mounted on the side walls of the reaction tank (41), and a lifting mechanism (5) for driving the two mounting plates (411) to rise and fall is installed on the top of the reaction tank (41); A scraping mechanism (6) for scraping off the precipitate is arranged at the folded corner of the static folding plate (412) close to the dynamic folding plate (413), and a linkage mechanism (7) for driving the scraping mechanism (6) to automatically scrape is arranged between the dynamic folding plate (413) and the static folding plate (412). The scraping mechanism (6) is also provided with a drug releasing mechanism (8) for reacting the scraped precipitate. When the scraping mechanism (6) is in motion, the drug releasing mechanism (8) automatically releases the drug.

2. The electroplating wastewater treatment system according to claim 1, wherein: The scraping mechanism (6) comprises a rotating shaft (61) and a spiral blade (62) coaxially arranged on the rotating shaft (61). The rotating shaft (61) and the spiral blade (62) are both provided in multiple groups. Each rotating shaft (61) is arranged in parallel on the static folding plate (412). Both ends of the rotating shaft (61) are rotatably mounted on the plate surface of the static folding plate (412), and one end of the rotating shaft (61) is transmission-connected with the linkage mechanism (7). When the lifting mechanism (5) drives the linkage mechanism (7) to move, the rotating shaft (61) drives the spiral blade (62) to rotate.

3. The electroplating wastewater treatment system according to claim 2, characterized in that: The spiral directions of adjacent spiral blades (62) are opposite.

4. A electroplating wastewater treatment system according to claim 1, characterized in that: The linkage mechanism (7) comprises an active adsorption member, a passive adsorption member (71), a fixed pulley (72), a pull rope (73), a rack (74) and a gear (75); the active adsorption member is installed on a side of the dynamic folding plate (413) close to the static folding plate (412); the passive adsorption member (71) is slidably installed on the static folding plate (412); and when the dynamic folding plate (413) moves, the active adsorption member can move to face the passive adsorption member (71); The fixed pulley (72) is rotatably mounted inside the static folding plate (412); one end of the pull rope (73) is fixedly connected to the driven adsorption member (71); the other end is wound around the fixed pulley (72) and connected to the end of the rack (74); the rack (74) is slidably mounted on the static folding plate (412), and the sliding direction is perpendicular to the length direction of each rotating shaft (61); a plurality of groups of gears (75) are provided corresponding to each rotating shaft (61); each gear (75) is coaxially fixed to the end of the corresponding rotating shaft (61), and the rack (74) is meshed with each gear (75).

5. The electroplating wastewater treatment system according to claim 4, characterized in that: The diameters of the adjacent gears (75) are different, and the tooth surface height of the rack (74) is adaptively set according to the diameters of the respective gears (75).

6. The electroplating wastewater treatment system according to claim 2, characterized in that: The medicament release mechanism (8) includes a medicine loading cylinder (81) and an outer protection cylinder (82). The medicine loading cylinder (81) is filled with medicament, and the medicine loading cylinder (81) is coaxially and rotatably attached to the inner wall of the outer protection cylinder (82). A plurality of medicine outlet holes (84) are formed in both the medicine loading cylinder (81) and the outer protection cylinder (82). A torsion spring (83) is provided between the bottom of the outer protection cylinder (82) and the bottom of the medicine loading cylinder (81). The medicine outlet holes (84) on the medicine loading cylinder (81) and the outer protection cylinder (82) are aligned during the rotation of the spiral blade (62).

7. An electroplating wastewater treatment system according to claim 6, characterized in that: Opening and closing structures for loading and replacing medicine are provided on both the outer protection cylinder (82) and the medicine loading cylinder (81).

8. A electroplating wastewater treatment system according to claim 1, characterized in that: The lifting mechanism (5) includes a screw rod (51) and a driving member (52). The screw rod (51) is rotatably installed in the mounting plate (411), and a thread groove adapted to the screw rod (51) is formed in the mounting plate (411). The driving member (52) is installed at the top of the reaction tank (41), and the output end is coaxially fixed to the screw rod (51).

9. A method for treating electroplating wastewater, which is applied to an electroplating wastewater treatment system as described in any one of claims 1-8, and is characterized in that: It includes the following steps: S1: The sensor detects the ion concentration in the electroplating wastewater entering the reaction tank (41), and the driving member (52) drives the dynamic folding plate (413) to lift and lower at a corresponding rate. S2: The active adsorbing member on the dynamic folding plate (413) drives the driven adsorbing member (71) to move during the lifting and lowering process, so that the rotating shaft (61) drives the spiral blade (62) to rotate, and scrapes and disperses the precipitate accumulated at the folding angle of the static folding plate (412). S3: When the spiral blade (62) rotates, it drives the medicine loading cylinder (81) to rotate, and the medicament in the medicine loading cylinder (81) contacts the surface of the scraped precipitate through the medicine outlet holes (84), promoting the positive progress of flocculation.

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