Electroplating wastewater recovery treatment equipment

Abstract

The invention relates to the technical field of electroplating wastewater treatment, in particular to electroplating wastewater recovery treatment equipment which comprises a reaction tank, a sedimentation tank for flocculent sedimentation is arranged at the discharge end of the reaction tank, a fixing plate is welded to the middle of the interior of the sedimentation tank, and a hopper for storing flocculent sediment is welded to the bottom of the flocculation tank; by adopting the pressing plate structure capable of adjusting the height and adjusting the internal opening, the pre-dehydration treatment of the sediment can be realized in the sediment discharge process of the sedimentation tank, the time consumption of the subsequent dehydration process is reduced, the water content in the sediment is reduced, and meanwhile, the chromium-containing electroplating wastewater is treated by utilizing flocculants at the two ends, so that the treatment efficiency is improved. According to the method, high-concentration chromium can be converted into Cr (OH) 3 through flocculent precipitation, the Cr (OH) 3 can be converted into Cr2O3 through high-temperature decomposition, Cr2O3 is compounded into the polishing paste and used for polishing machine parts, the polishing effect is good, chromium in the electroplating wastewater is fully recycled, and environmental pollution is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of electroplating wastewater treatment production, and in particular to electroplating wastewater recovery and treatment equipment. Background Art

[0002] Electroplating wastewater treatment refers to the treatment of wastewater or waste liquid discharged during the electroplating production process. The wastewater and waste liquid discharged from the electroplating factory contain a large amount of metal ions such as chromium, thorium, nickel, cyanide, acid, alkali, and generally contain organic additives. Some metal ions exist in the form of simple cations, some exist in the form of acid anions, and some exist in the form of complex complex ions. Due to the high content of harmful substances in electroplating wastewater, electroplating production enterprises generally have electroplating wastewater treatment equipment to treat the discharged electroplating wastewater to meet the discharge standards. Neutralization precipitation method, neutralization coagulation precipitation method, oxidation method, reduction method, barium salt method, ferrite method, etc. are commonly used for electroplating wastewater treatment;

[0003] At present, in the process of treating chromium-containing wastewater, the treatment methods of chromium-containing wastewater at home and abroad mainly include ferrite treatment, sulfite reduction, adsorption, ion exchange, electrolytic treatment, electrodialysis and other methods. In terms of reuse, in the commonly used centralized chromium-containing wastewater treatment process, flocculants are mostly required for precipitation reaction treatment. In the existing precipitation equipment, during the sediment discharge process, since there is a lot of supernatant in the tank body, it is easy to cause the synchronous discharge of supernatant during the sediment discharge process, resulting in a large amount of water content in the recovered sediment. In the subsequent treatment, a dehydration process must be added, which increases the time consumption of the treatment. At the same time, during the flocculation and precipitation reaction process, the added flocculant is generally mixed with an external stirring device, resulting in a high overall energy consumption of the equipment. Therefore, an electroplating wastewater recovery and treatment equipment is proposed. During the sediment separation and discharge process, the water content in the sediment is reduced, thereby reducing the time consumption of the subsequent dehydration process. At the same time, the work of the external mixing equipment can be reduced during the flocculation and precipitation process, and the energy consumption in the treatment process can be reduced. Summary of the invention

[0004] In response to the problems in the prior art, the present invention provides an electroplating wastewater recovery and treatment equipment, which can reduce the water content in the precipitate during the separation and discharge of the precipitate, thereby reducing the time consumption of the subsequent dehydration process. At the same time, it can reduce the work of the external mixing equipment during the flocculation and sedimentation process, and reduce the energy consumption in the treatment process.

[0005] The technical solution adopted by the present invention to solve the technical problem is an electroplating wastewater recovery and treatment device, comprising a reaction tank, a sedimentation tank for flocculation sedimentation is arranged at the discharge end of the reaction tank, a fixed plate is welded at the middle position inside the sedimentation tank, and a hopper for storing flocculated sediment is welded at the bottom of the flocculation tank;

[0006] The top of the sedimentation tank is movably connected to a top plate and a hydraulic cylinder B is installed on the top of the top plate, a pressure plate located at the bottom of the top plate and inserted into the sedimentation tank is installed at the power output end of the hydraulic cylinder B, a through groove is opened inside the pressure plate and a filter plate is installed at one end of the through groove, a slot is opened inside the pressure plate close to one side of the through groove and a partition located at the top of the filter plate is inserted into the slot, a sleeve is installed at the bottom of the top plate and a control rod inserted into the sleeve is fixedly connected to the top of the partition.

[0007] By adopting the above technical solution, the control rod structure can move horizontally under the action of the external power equipment component to adjust the position of the partition. During the normal flocculation and sedimentation process, the pressure plate is at a position that fits the liquid level. At this time, the partition body is inserted into the slot, and the through slot is in a fully open state. After the flocculation and sedimentation process is completed, the hydraulic cylinder C operates to move the partition to one side of the filter plate until the partition is close to the top of the filter plate. At this time, the hydraulic cylinder B operates to drive the pressure plate downward. At the same time, the supernatant will penetrate the filter plate and penetrate into the top of the pressure plate during the downward movement, and the flocculants will be pressed down by the pressure plate into the hopper. As the pressure plate continues to move downward, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition continues to move until it completely covers the filter plate and blocks the through slot, thereby isolating the sediment from the supernatant and avoiding the mixing of the supernatant during the sediment discharge process.

[0008] Specifically, a manifold is embedded in the top plate, and a wastewater inlet pipe connected to the manifold is installed at the discharge end of the reaction tank through a pump body, an auxiliary agent inlet pipe is installed on one side of the surface of the wastewater inlet pipe, and an electromagnetic three-way valve A is provided at the connection between the auxiliary agent inlet pipe and the wastewater inlet pipe, a flocculant inlet pipe connected to a precipitant supply device is installed on one side of the top of the top plate, and the discharge end of the flocculant inlet pipe is connected to the manifold, a rotating shaft is installed inside the manifold, and a stirring blade is fixedly connected to the periphery of the rotating shaft, a volute is installed vertically at one end of the top plate, and a turbine is installed inside the volute, and a transmission sleeve extending to the bottom of the top plate is installed at the center of the turbine.

[0009] By adopting the above technical scheme, the wastewater after the preliminary reaction in the reaction tank is input into the confluence pipe through the wastewater inlet pipe under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe, and the preliminary mixing is achieved in the confluence and circulation of water bodies. At the same time, the impact force of the water flow will drive the rotation of the rotating shaft and the stirring blades in the mixing process. After the sodium hydroxide and the wastewater are fully mixed in the confluence pipe, they are discharged into the sedimentation tank through the discharge pipe for flocculation reaction. In the later stage of the flocculation reaction, the auxiliary agent is discharged from the auxiliary agent inlet pipe and the composite flocculant is discharged from the flocculant inlet pipe. The electromagnetic three-way valve B is adjusted to allow the water flow to enter the volute and use the water flow to impact the turbine to rotate. Under the impact of the water flow, the turbine rotates and drives the rotation of the transmission sleeve and the transmission shaft, so that the wastewater and flocculant discharged into the sedimentation tank can be further fully mixed and processed.

[0010] Specifically, a supernatant discharge pipe connected to the interior of the sedimentation tank is installed on one side of the surface of the sedimentation tank, chutes A are opened on both sides of the top of the sedimentation tank, support rods are fixedly connected to the four corners of the bottom of the top plate, and pulleys located inside the chute A are provided at the bottom of the support rods, and a hydraulic cylinder A is installed on one side of the side of the sedimentation tank, and the power end of the hydraulic cylinder A is connected to the pulley.

[0011] By adopting the above technical solution, the supernatant is discharged through the supernatant discharge pipe, and the bottom of the top plate is connected to the slide trough through a support rod and a pulley, so that the top plate can move horizontally on the top of the sedimentation tank. The hydraulic cylinder A provides power to drive the movement of the top plate and the pressure plate. The interior of the sedimentation tank is divided into two different areas by a fixed plate. When sedimentation operations are carried out on one side, the other side can be conveniently maintained and cleaned and is in a standby state.

[0012] Specifically, a slide groove B is opened horizontally inside the top plate, a slider located inside the slide groove B is arranged on the top of the sleeve and the sliders are connected by a connecting rod, a hydraulic cylinder C is installed on one side of the top plate surface and the power end of the hydraulic cylinder C is connected to the slider.

[0013] By adopting the above technical solution, when the power end of the hydraulic cylinder C moves, the slider is controlled to move inside the slide groove B, and then the partition is driven to move through the sleeve and the control rod, and the opening state of the partition is adjusted to meet the requirements of different processes.

[0014] Specifically, the outer periphery of the pressing plate is covered with a rubber sleeve that fits to the inner wall of the sedimentation tank.

[0015] By adopting the above technical solution, the rubber sleeve structure wrapped around the outer periphery of the pressing plate fits tightly against the inner wall of the sedimentation tank, and can maintain the sealing of the connection between the outer periphery of the pressing plate and the inner wall of the sedimentation tank during the downward movement of the pressing plate.

[0016] Specifically, a one-way valve is installed inside the flocculant inlet pipe, a drain pipe extending to the inside of the pressure plate is installed at the discharge end of the volute, a discharge pipe connected to the inside of the drain pipe is installed at the end of the manifold, and an electromagnetic three-way valve B is installed at the connection between the discharge pipe and the manifold, and the discharge end of the manifold is connected to the inside of the volute.

[0017] By adopting the above technical solution, the wastewater and coagulant output from the volute are input into the sedimentation tank through the drain pipe, and the discharge end of the manifold can flow into the volute or the discharge pipe. The discharge direction of the discharge end of the manifold can be regulated by the electromagnetic three-way valve B.

[0018] Specifically, a slot is vertically provided on the inner wall of the transmission sleeve, a transmission shaft is inserted into the bottom of the transmission sleeve, and a block is integrally formed on the outer circumference of the transmission shaft and inserted into the slot, and a stirring rod located at the bottom of the pressure plate is installed at the bottom of the transmission shaft.

[0019] By adopting the above technical solution, the transmission shaft and the traditional sleeve are connected through the slot and the block, which does not affect the lifting and lowering of the pressure plate. At the same time, no matter what height position the pressure plate is at, the transmission sleeve can drive the movement of the transmission rod, and then drive the rotation of the stirring rod.

[0020] Specifically, a conveyor belt for conveying and discharging sediment is installed horizontally between the bottom of the hopper and the bottom of the reaction tank.

[0021] By adopting the above technical solution, when the hopper discharges sediment, it is directly discharged onto the surface of the conveyor belt and discharged by the conveyor belt.

[0022] Beneficial effects of the present invention:

[0023] (1) In the electroplating wastewater recovery and treatment equipment described in the present invention, the control rod structure can be moved horizontally under the action of the external power equipment component to adjust the position of the partition. During the normal flocculation and sedimentation treatment process, the pressure plate is at a position that fits the liquid level. At this time, the partition body is inserted into the slot and the through slot is in a fully open state. After the flocculation and sedimentation treatment is completed, the hydraulic cylinder C is operated to move the partition to one side of the filter plate until the partition is close to the top of the filter plate. At this time, the hydraulic cylinder B is operated to drive the pressure plate to move downward. At the same time, the supernatant will penetrate the filter plate and penetrate to the top of the pressure plate during the downward movement. The flocculants will be pressed down into the hopper by the pressing plate. As the pressing plate continues to move downward, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition continues to move until it completely covers the filter plate and blocks the through groove, thereby isolating the sediment from the supernatant and avoiding the mixing of the supernatant during the sediment discharge process. The pressing plate structure with adjustable height and internal opening can realize pre-dehydration of the sediment during the sedimentation tank discharge process, reduce the time of subsequent dehydration process, and reduce the water content inside the sediment.

[0024] (2) In the electroplating wastewater recovery and treatment equipment described in the present invention, the wastewater after the preliminary reaction in the reaction tank is input into the manifold through the wastewater inlet pipe under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe. The intersection and flow of water bodies are used to achieve preliminary mixing in the manifold. At the same time, during the mixing process, the impact force of the water flow will drive the rotation of the rotating shaft and the stirring blades. After the sodium hydroxide and the wastewater are fully mixed in the manifold, they are discharged into the sedimentation tank through the discharge pipe for flocculation reaction. In the process of discharging the wastewater and the flocculant, the water flow inertia and impact force are used for mixing treatment, which reduces the time of subsequent mixing and reduces the energy consumption of the externally installed mixing equipment.

[0025] (3) The electroplating wastewater recovery and treatment equipment described in the present invention discharges auxiliary agent from the auxiliary agent inlet pipe and discharges composite flocculant from the flocculant inlet pipe in the late stage of flocculation reaction. The composite flocculant is prepared by mixing inorganic flocculant, polymer flocculant and buffer solution. The electromagnetic three-way valve B is used to adjust the water flow into the volute and the turbine is rotated by the impact of the water flow. The turbine rotates under the impact of the water flow and drives the rotation of the transmission sleeve and the transmission shaft, so that the wastewater and flocculant discharged into the sedimentation tank can be further fully mixed and treated. In the initial flocculation process, chromium hydroxide is suspended in the supernatant in the form of colloid particles, and is further flocculated by the input composite flocculant to separate it from the supernatant. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the pressing plate structure of the present invention;

[0029] Figure 3 It is a schematic diagram of the internal structure of the through slot of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the connection between the top plate and the pressure plate of the present invention;

[0031] Figure 5 It is a schematic diagram of the internal structure of the top plate of the present invention;

[0032] Figure 6 This is a schematic diagram of the top plan structure of the sedimentation tank of the present invention;

[0033] In the figure: 100, reaction tank; 200, sedimentation tank; 201, fixed plate; 202, supernatant discharge pipe; 203, chute A; 204, support rod; 205, pulley; 206, hydraulic cylinder A; 207, hopper; 300, top plate; 301, hydraulic cylinder B; 302, pressure plate; 303, through groove; 304, filter plate; 305, slot; 306, partition; 307, control rod; 308, sleeve; 309, chute B; 310, slider; 311, connecting rod; 312, hydraulic Cylinder C; 313, rubber sleeve; 400, manifold; 401, wastewater inlet pipe; 402, auxiliary agent inlet pipe; 403, electromagnetic three-way valve A; 404, flocculant inlet pipe; 405, one-way valve; 406, rotating shaft; 407, stirring blade; 408, discharge pipe; 409, volute; 410, turbine; 411, electromagnetic three-way valve B; 412, transmission sleeve; 413, slot; 414, transmission shaft; 415, block; 416, stirring rod; 417, drain pipe; 500, conveyor belt. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0035] Embodiment 1:

[0036] The technical solution adopted by the present invention to solve the technical problem is an electroplating wastewater recycling and treatment device, comprising a reaction tank 100, wherein a sedimentation tank 200 for flocculation and sedimentation is arranged at the discharge end of the reaction tank 100, a fixing plate 201 is welded at the middle position inside the sedimentation tank 200, and a hopper 207 for storing flocculated sediment is welded at the bottom of the flocculation tank;

[0037] The top of the sedimentation tank 200 is movably connected to a top plate 300 and a hydraulic cylinder B301 is installed on the top of the top plate 300. A pressure plate 302 located at the bottom of the top plate 300 and inserted into the sedimentation tank 200 is installed at the power output end of the hydraulic cylinder B301. A through groove 303 is opened inside the pressure plate 302 and a filter plate 304 is installed at one end of the through groove 303. A slot 305 is opened inside the pressure plate 302 near the through groove 303 and a partition 306 located at the top of the filter plate 304 is inserted into the slot 305. A sleeve 308 is installed at the bottom of the top plate 300 and a control rod 307 inserted into the sleeve 308 is fixedly connected to the top of the partition 306.

[0038] When in use, the control rod 307 structure can be horizontally moved under the action of the external power equipment assembly to adjust the position of the partition 306. In the normal flocculation sedimentation process, the pressure plate 302 is at a position that fits the liquid level. At this time, the partition 306 body is inserted into the slot 305, and the through slot 303 is in a fully open state. After the flocculation sedimentation process is completed, the hydraulic cylinder C312 operates to move the partition 306 to the side of the filter plate 304 until the partition 306 is close to the top of the filter plate 304. At this time, the hydraulic cylinder B30 The operation of the press plate 302 drives the press plate 302 to move downward. During the downward movement, the supernatant will penetrate the filter plate 304 and penetrate into the top of the press plate 302, and the flocculants will be pressed down to the inside of the hopper 207 by the press plate 302. As the press plate 302 continues to move downward, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant and preventing the supernatant from mixing in the sediment discharge process.

[0039] Specifically, a manifold 400 is embedded in the top plate 300, and a wastewater inlet pipe 401 connected to the manifold 400 is installed at the discharge end of the reaction tank 100 through a pump body, an auxiliary agent inlet pipe 402 is installed on one side of the surface of the wastewater inlet pipe 401, and an electromagnetic three-way valve A403 is provided at the connection between the auxiliary agent inlet pipe 402 and the wastewater inlet pipe 401, a flocculant inlet pipe 404 connected to a precipitant supply device is installed on one side of the top of the top plate 300, and the discharge end of the flocculant inlet pipe 404 is connected to the manifold 400, a rotating shaft 406 is installed inside the manifold 400, and a stirring blade 407 is fixedly connected to the periphery of the rotating shaft 406, a volute 409 is vertically installed at one end of the top plate 300, and a turbine 410 is installed inside the volute 409, and a transmission sleeve 412 extending to the bottom of the top plate 300 is installed at the center of the turbine 410.

[0040] When in use, the wastewater after the preliminary reaction in the reaction tank 100 is input into the confluence pipe 400 through the wastewater inlet pipe 401 under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe 404. The confluence of water bodies is used to achieve preliminary mixing inside the confluence pipe 400. At the same time, the impact force of the water flow will drive the rotation of the rotating shaft 406 and the stirring blade 407 during the mixing process. After the sodium hydroxide and the wastewater are fully mixed inside the confluence pipe 400, they are discharged from the discharge pipe 404. 08 is discharged into the sedimentation tank 200 for flocculation reaction. In the later stage of flocculation reaction, the auxiliary agent is discharged from the auxiliary agent inlet pipe 402 and the composite flocculant is discharged from the flocculant inlet pipe 404. The electromagnetic three-way valve B411 is adjusted to allow the water flow to enter the volute 409 and use the water flow to impact the turbine 410 to rotate. Under the impact of the water flow, the turbine 410 rotates and drives the rotation of the transmission sleeve 412 and the transmission shaft 414, so that the wastewater and flocculant discharged into the sedimentation tank 200 can be further fully mixed and treated.

[0041] Specifically, a supernatant discharge pipe 202 connected to the interior of the sedimentation tank 200 is installed on one side of the surface of the sedimentation tank 200, and slide grooves A203 are opened on both sides of the top of the sedimentation tank 200. Support rods 204 are fixedly connected to the four corners of the bottom of the top plate 300, and pulleys 205 located inside the slide grooves A203 are provided at the bottom of the support rods 204. A hydraulic cylinder A206 is installed on one side of the sedimentation tank 200, and the power end of the hydraulic cylinder A206 is connected to the pulley 205.

[0042] When in use, the supernatant is discharged through the supernatant discharge pipe 202, and the bottom of the top plate 300 is connected to the slide trough through the support rod 204 and the pulley 205, so that the top plate 300 can move horizontally on the top of the sedimentation tank 200. The hydraulic cylinder A206 provides power to drive the movement of the top plate 300 and the pressure plate 302. The fixed plate 201 is used to divide the interior of the sedimentation tank 200 into two different areas. When sedimentation operations are carried out on one side, the other side can be conveniently maintained and cleaned and is in a standby state.

[0043] Specifically, a slide groove B309 is opened horizontally inside the top plate 300, a slider 310 located inside the slide groove B309 is arranged on the top of the sleeve 308, and the sliders 310 are connected by a connecting rod 311, and a hydraulic cylinder C312 is installed on one side of the surface of the top plate 300, and the power end of the hydraulic cylinder C312 is connected to the slider 310.

[0044] When in use, the power end of the hydraulic cylinder C312 moves by controlling the slider 310 to move inside the slide groove B309, and then drives the movement of the partition 306 through the sleeve 308 and the control rod 307, and adjusts the opening state of the partition 306 to meet the requirements of different processes.

[0045] Specifically, the outer periphery of the pressing plate 302 is covered with a rubber sleeve 313 that fits to the inner wall of the sedimentation tank 200 .

[0046] When in use, the rubber sleeve 313 structure wrapped around the outer periphery of the pressing plate 302 fits tightly against the inner wall of the sedimentation tank 200, and can maintain the sealing of the connection between the outer periphery of the pressing plate 302 and the inner wall of the sedimentation tank 200 during the downward movement of the pressing plate 302.

[0047] Specifically, a one-way valve 405 is installed inside the flocculant inlet pipe 404, a drain pipe 417 extending to the inside of the pressure plate 302 is installed at the discharge end of the volute 409, a discharge pipe 408 connected to the inside of the drain pipe 417 is installed at the end of the manifold 400, and an electromagnetic three-way valve B411 is installed at the connection between the discharge pipe 408 and the manifold 400, and the discharge end of the manifold 400 is connected to the inside of the volute 409.

[0048] When in use, the wastewater and coagulant output from the volute 409 are input into the sedimentation tank 200 through the drain pipe 417, and the discharge end of the conduit 400 can flow into the volute 409 or the discharge pipe 408. The discharge direction of the discharge end of the conduit 400 can be regulated by the electromagnetic three-way valve B411.

[0049] Specifically, a slot 413 is vertically formed on the inner wall of the transmission sleeve 412, a transmission shaft 414 is inserted into the bottom of the transmission sleeve 412, and a block 415 is integrally formed on the outer periphery of the transmission shaft 414 and inserted into the slot 413, and a stirring rod 416 located at the bottom of the pressure plate 302 is installed at the bottom of the transmission shaft 414.

[0050] When in use, the transmission shaft 414 is connected to the traditional sleeve through the slot 413 and the block 415, which does not affect the lifting and lowering of the pressure plate 302. At the same time, no matter what height position the pressure plate 302 is at, the transmission sleeve 412 can drive the movement of the transmission rod, and then drive the rotation of the stirring rod 416.

[0051] Specifically, a conveyor belt 500 for conveying and discharging sediment is installed horizontally between the bottom of the hopper 207 and the bottom of the reaction tank 100 .

[0052] When in use, when the hopper 207 discharges sediment, it is directly discharged onto the surface of the conveyor belt 500 and discharged from the conveyor belt 500 .

[0053] When in use, the control rod 307 structure can be horizontally moved under the action of the external power equipment component to adjust the position of the partition 306. In the normal flocculation sedimentation process, the pressure plate 302 is at a position that fits the liquid level. At this time, the main body of the partition 306 is inserted into the slot 305, and the through slot 303 is in a fully open state. After the flocculation sedimentation process is completed, the hydraulic cylinder C312 operates to move the partition 306 to the side of the filter plate 304 until the partition 306 is close to the top of the filter plate 304. At this time, the liquid The operation of the pressure cylinder B301 drives the pressure plate 302 to move downward. During the downward movement, the supernatant will penetrate the filter plate 304 and penetrate into the top of the pressure plate 302, and the flocculants will be pressed down to the inside of the hopper 207 by the pressure plate 302. As the pressure plate 302 continues to move downward, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant. In order to avoid the mixing of supernatant during the process, a pressure plate 302 structure with adjustable height and internal opening is adopted, which can realize pre-dehydration treatment of sediment in the sedimentation tank 200 during sedimentation discharge, reduce the time consumption of subsequent dehydration process, and reduce the water content inside the sediment. The wastewater after preliminary reaction in the reaction tank 100 is input into the inside of the manifold 400 through the wastewater inlet pipe 401 under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe 404. In the manifold 400, preliminary mixing is achieved by the intersection and flow of water bodies. At the same time, during the mixing process, the impact force of the water flow will drive the rotation of the rotating shaft 406 and the stirring blade 407. After the sodium hydroxide and the wastewater are fully mixed in the manifold 400, they are discharged into the sedimentation tank 200 through the discharge pipe 408 for flocculation reaction. In the process of wastewater and flocculant discharge, the water flow inertia and impact force are used for mixing treatment, which reduces the time consumption of subsequent mixing and reduces the energy consumption of externally installed mixing equipment.

[0054] Embodiment 2:

[0055] The technical solution adopted by the present invention to solve the technical problem is an electroplating wastewater recycling and treatment device, comprising a reaction tank 100, wherein a sedimentation tank 200 for flocculation and sedimentation is arranged at the discharge end of the reaction tank 100, a fixing plate 201 is welded at the middle position inside the sedimentation tank 200, and a hopper 207 for storing flocculated sediment is welded at the bottom of the flocculation tank;

[0056] The top of the sedimentation tank 200 is movably connected to a top plate 300 and a hydraulic cylinder B301 is installed on the top of the top plate 300. A pressure plate 302 located at the bottom of the top plate 300 and inserted into the sedimentation tank 200 is installed at the power output end of the hydraulic cylinder B301. A through groove 303 is opened inside the pressure plate 302 and a filter plate 304 is installed at one end of the through groove 303. A slot 305 is opened inside the pressure plate 302 near the through groove 303 and a partition 306 located at the top of the filter plate 304 is inserted into the slot 305. A sleeve 308 is installed at the bottom of the top plate 300 and a control rod 307 inserted into the sleeve 308 is fixedly connected to the top of the partition 306.

[0057] When in use, the control rod 307 structure can be horizontally moved under the action of the external power equipment assembly to adjust the position of the partition 306. In the normal flocculation sedimentation process, the pressure plate 302 is at a position that fits the liquid level. At this time, the partition 306 body is inserted into the slot 305, and the through slot 303 is in a fully open state. After the flocculation sedimentation process is completed, the hydraulic cylinder C312 operates to move the partition 306 to the side of the filter plate 304 until the partition 306 is close to the top of the filter plate 304. At this time, the hydraulic cylinder B30 The operation of the press plate 302 drives the press plate 302 to move downward. During the downward movement, the supernatant will penetrate the filter plate 304 and penetrate into the top of the press plate 302, and the flocculants will be pressed down to the inside of the hopper 207 by the press plate 302. As the press plate 302 continues to move downward, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant and preventing the supernatant from mixing in the sediment discharge process.

[0058] Specifically, a manifold 400 is embedded in the top plate 300, and a wastewater inlet pipe 401 connected to the manifold 400 is installed at the discharge end of the reaction tank 100 through a pump body, an auxiliary agent inlet pipe 402 is installed on one side of the surface of the wastewater inlet pipe 401, and an electromagnetic three-way valve A403 is provided at the connection between the auxiliary agent inlet pipe 402 and the wastewater inlet pipe 401, a flocculant inlet pipe 404 connected to a precipitant supply device is installed on one side of the top of the top plate 300, and the discharge end of the flocculant inlet pipe 404 is connected to the manifold 400, a rotating shaft 406 is installed inside the manifold 400, and a stirring blade 407 is fixedly connected to the periphery of the rotating shaft 406, a volute 409 is vertically installed at one end of the top plate 300, and a turbine 410 is installed inside the volute 409, and a transmission sleeve 412 extending to the bottom of the top plate 300 is installed at the center of the turbine 410.

[0059] When in use, the wastewater after the preliminary reaction in the reaction tank 100 is input into the confluence pipe 400 through the wastewater inlet pipe 401 under the action of the pump body. During the input process, the initial precipitant sodium hydroxide is discharged from the flocculant inlet pipe 404. The confluence of water bodies is used to achieve preliminary mixing inside the confluence pipe 400. At the same time, the impact force of the water flow will drive the rotation of the rotating shaft 406 and the stirring blade 407 during the mixing process. After the sodium hydroxide and the wastewater are fully mixed inside the confluence pipe 400, they are discharged from the discharge pipe 404. 08 is discharged into the sedimentation tank 200 for flocculation reaction. In the later stage of flocculation reaction, the auxiliary agent is discharged from the auxiliary agent inlet pipe 402 and the composite flocculant is discharged from the flocculant inlet pipe 404. The electromagnetic three-way valve B411 is adjusted to allow the water flow to enter the volute 409 and use the water flow to impact the turbine 410 to rotate. Under the impact of the water flow, the turbine 410 rotates and drives the rotation of the transmission sleeve 412 and the transmission shaft 414, so that the wastewater and flocculant discharged into the sedimentation tank 200 can be further fully mixed and treated.

[0060] Specifically, a supernatant discharge pipe 202 connected to the interior of the sedimentation tank 200 is installed on one side of the surface of the sedimentation tank 200, and slide grooves A203 are opened on both sides of the top of the sedimentation tank 200. Support rods 204 are fixedly connected to the four corners of the bottom of the top plate 300, and pulleys 205 located inside the slide grooves A203 are provided at the bottom of the support rods 204. A hydraulic cylinder A206 is installed on one side of the sedimentation tank 200, and the power end of the hydraulic cylinder A206 is connected to the pulley 205.

[0061] When in use, the supernatant is discharged through the supernatant discharge pipe 202, and the bottom of the top plate 300 is connected to the slide trough through the support rod 204 and the pulley 205, so that the top plate 300 can move horizontally on the top of the sedimentation tank 200. The hydraulic cylinder A206 provides power to drive the movement of the top plate 300 and the pressure plate 302. The fixed plate 201 is used to divide the interior of the sedimentation tank 200 into two different areas. When sedimentation operations are carried out on one side, the other side can be conveniently maintained and cleaned and is in a standby state.

[0062] Specifically, a slide groove B309 is opened horizontally inside the top plate 300, a slider 310 located inside the slide groove B309 is arranged on the top of the sleeve 308, and the sliders 310 are connected by a connecting rod 311, and a hydraulic cylinder C312 is installed on one side of the surface of the top plate 300, and the power end of the hydraulic cylinder C312 is connected to the slider 310.

[0063] When in use, the power end of the hydraulic cylinder C312 moves by controlling the slider 310 to move inside the slide groove B309, and then drives the movement of the partition 306 through the sleeve 308 and the control rod 307, and adjusts the opening state of the partition 306 to meet the requirements of different processes.

[0064] Specifically, the outer periphery of the pressing plate 302 is covered with a rubber sleeve 313 that fits to the inner wall of the sedimentation tank 200 .

[0065] When in use, the rubber sleeve 313 structure wrapped around the outer periphery of the pressing plate 302 fits tightly against the inner wall of the sedimentation tank 200, and can maintain the sealing of the connection between the outer periphery of the pressing plate 302 and the inner wall of the sedimentation tank 200 during the downward movement of the pressing plate 302.

[0066] Specifically, a one-way valve 405 is installed inside the flocculant inlet pipe 404, a drain pipe 417 extending to the inside of the pressure plate 302 is installed at the discharge end of the volute 409, a discharge pipe 408 connected to the inside of the drain pipe 417 is installed at the end of the manifold 400, and an electromagnetic three-way valve B411 is installed at the connection between the discharge pipe 408 and the manifold 400, and the discharge end of the manifold 400 is connected to the inside of the volute 409.

[0067] When in use, the wastewater and coagulant output from the volute 409 are input into the sedimentation tank 200 through the drain pipe 417, and the discharge end of the conduit 400 can flow into the volute 409 or the discharge pipe 408. The discharge direction of the discharge end of the conduit 400 can be regulated by the electromagnetic three-way valve B411.

[0068] Specifically, a slot 413 is vertically formed on the inner wall of the transmission sleeve 412, a transmission shaft 414 is inserted into the bottom of the transmission sleeve 412, and a block 415 is integrally formed on the outer periphery of the transmission shaft 414 and inserted into the slot 413, and a stirring rod 416 located at the bottom of the pressure plate 302 is installed at the bottom of the transmission shaft 414.

[0069] When in use, the transmission shaft 414 is connected to the traditional sleeve through the slot 413 and the block 415, which does not affect the lifting and lowering of the pressure plate 302. At the same time, no matter what height position the pressure plate 302 is at, the transmission sleeve 412 can drive the movement of the transmission rod, and then drive the rotation of the stirring rod 416.

[0070] Specifically, a conveyor belt 500 for conveying and discharging sediment is installed horizontally between the bottom of the hopper 207 and the bottom of the reaction tank 100 .

[0071] When in use, when the hopper 207 discharges sediment, it is directly discharged onto the surface of the conveyor belt 500 and discharged from the conveyor belt 500 .

[0072] When in use, the control rod 307 structure can be moved horizontally under the action of the external power equipment component to adjust the position of the partition 306. During the normal flocculation sedimentation process, the pressure plate 302 is at a position that fits the liquid level. At this time, the main body of the partition 306 is inserted into the slot 305, and the through slot 303 is in a fully open state. After the flocculation sedimentation process is completed, the hydraulic cylinder C312 operates to move the partition 306 to the side of the filter plate 304 until the partition 306 is close to the top of the filter plate 304. At this time, the hydraulic cylinder B301 operates to drive the pressure plate 302 to move downward. At the same time, the supernatant will pass through the filter plate during the downward movement. 304 penetrates to the top of the pressing plate 302, and the flocculants are pressed down to the inside of the hopper 207 by the pressing plate 302. As the pressing plate 302 continues to move downward, the flocculants can be squeezed and dehydrated to reduce the water content in the sediment. Before the sediment is discharged, the partition plate 306 continues to move until it completely covers the filter plate 304 and blocks the through groove 303, thereby isolating the sediment from the supernatant and avoiding the mixing of the supernatant during the sediment discharge process. The pressing plate 302 structure with adjustable height and internal opening can realize the pre-dehydration of the sediment during the sediment discharge process in the sedimentation tank 200. The water content of the sediment is reduced by reducing the time consumption of the subsequent dehydration process. In the later stage of the flocculation reaction, the auxiliary agent is discharged from the auxiliary agent inlet pipe 402 and the composite flocculant is discharged from the flocculant inlet pipe 404. The composite flocculant is prepared by mixing inorganic flocculants, polymer flocculants and buffer. The electromagnetic three-way valve B411 is used to adjust the water flow to enter the volute 409 and use the water flow to impact the turbine 410 to rotate. Under the impact of the water flow, the turbine 410 rotates and drives the rotation of the transmission sleeve 412 and the transmission shaft 414, so that the wastewater and flocculant discharged into the sedimentation tank 200 can be further fully Mixed treatment, in the initial flocculation process, chromium hydroxide is suspended in the supernatant in the form of colloids, and is further flocculated by the added composite flocculant to separate it from the supernatant. At this time, the precipitate is dehydrated and discharged. The chromium-containing electroplating wastewater is treated with flocculants at both ends. High-concentration chromium can be converted into Cr(OH)3 through flocculation precipitation, and Cr(0H)3 can be converted into Cr2O3 through high-temperature decomposition. Cr2O3 is compounded into polishing paste and used for polishing of machine parts. It has a good polishing effect, fully recovers the chromium in the electroplating wastewater, and reduces environmental pollution.

[0073] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. An electroplating wastewater recovery and treatment device, comprising a reaction tank (100), wherein a sedimentation tank (200) for flocculation and sedimentation is arranged at the discharge end of the reaction tank (100), a fixing plate (201) is welded at the middle position inside the sedimentation tank (200), and a hopper (207) for storing flocculated sediment is welded at the bottom of the flocculation tank; It is characterized in that The top of the sedimentation tank (200) is movably connected to a top plate (300) and a hydraulic cylinder B (301) is installed on the top of the top plate (300); a pressure plate (302) located at the bottom of the top plate (300) and inserted into the sedimentation tank (200) is installed at the power output end of the hydraulic cylinder B (301); a through groove (303) is provided inside the pressure plate (302) and a filter plate (304) is installed at one end inside the through groove (303); a slot (305) is provided inside the pressure plate (302) on one side close to the through groove (303) and a partition (306) located at the top of the filter plate (304) is inserted into the slot (305); a sleeve (308) is installed at the bottom of the top plate (300) and a control rod (307) inserted into the sleeve (308) is fixedly connected to the top of the partition (306).

2. The electroplating wastewater recycling and treatment equipment according to claim 1 is characterized in that: A manifold (400) is embedded in the top plate (300), and a wastewater inlet pipe (401) connected to the manifold (400) is installed at the discharge end of the reaction tank (100) through a pump body, an auxiliary agent inlet pipe (402) is installed on one side of the surface of the wastewater inlet pipe (401), and an electromagnetic three-way valve A (403) is provided at the connection between the auxiliary agent inlet pipe (402) and the wastewater inlet pipe (401), and a flocculant inlet (402) connected to the precipitant supply device is installed on one side of the top plate (300). The flocculant inlet pipe (404) is connected to the confluence pipe (400) and the discharge end of the flocculant inlet pipe (404) is connected to the confluence pipe (400). A rotating shaft (406) is installed inside the confluence pipe (400) and a stirring blade (407) is fixedly connected to the outer periphery of the rotating shaft (406). A volute (409) is installed vertically at one end of the top plate (300) and a turbine (410) is installed inside the volute (409). A transmission sleeve (412) extending to the bottom of the top plate (300) is installed at the center of the turbine (410).

3. The electroplating wastewater recycling and treatment equipment according to claim 2 is characterized in that: A supernatant discharge pipe (202) connected to the interior of the sedimentation tank (200) is installed on one side of the surface of the sedimentation tank (200), and slide grooves A (203) are opened on both sides of the top of the sedimentation tank (200). Support rods (204) are fixedly connected to the four corners of the bottom of the top plate (300), and pulleys (205) located inside the slide grooves A (203) are arranged at the bottom of the support rods (204). A hydraulic cylinder A (206) is installed on one side of the side of the sedimentation tank (200), and the power end of the hydraulic cylinder A (206) is connected to the pulley (205).

4. The electroplating wastewater recycling and treatment equipment according to claim 3 is characterized in that: A slide groove B (309) is provided in the horizontal direction inside the top plate (300), a slider (310) located inside the slide groove B (309) is provided on the top of the sleeve (308), and the sliders (310) are connected by a connecting rod (311), and a hydraulic cylinder C (312) is installed on one side of the surface of the top plate (300), and the power end of the hydraulic cylinder C (312) is connected to the slider (310).

5. The electroplating wastewater recycling and treatment equipment according to claim 4 is characterized in that: The outer periphery of the pressing plate (302) is coated with a rubber sleeve (313) that fits to the inner wall of the sedimentation tank (200).

6. The electroplating wastewater recycling and treatment equipment according to claim 5, characterized in that: A one-way valve (405) is installed inside the flocculant inlet pipe (404), a drainage pipe (417) extending to the inside of the pressure plate (302) is installed at the discharge end of the volute (409), a discharge pipe (408) connected to the inside of the drainage pipe (417) is installed at the end of the confluence pipe (400), and an electromagnetic three-way valve B (411) is installed at the connection between the discharge pipe (408) and the confluence pipe (400), and the discharge end of the confluence pipe (400) is connected to the inside of the volute (409).

7. The electroplating wastewater recycling and treatment equipment according to claim 6 is characterized in that: A slot (413) is provided on the inner wall of the transmission sleeve (412) in a vertical direction, a transmission shaft (414) is inserted into the bottom of the transmission sleeve (412), and a block (415) is integrally formed on the outer circumference of the transmission shaft (414) and is inserted into the slot (413), and a stirring rod (416) located at the bottom of the pressure plate (302) is installed at the bottom of the transmission shaft (414).

8. The electroplating wastewater recycling and treatment equipment according to claim 7 is characterized in that: A conveyor belt (500) is installed horizontally between the bottom of the hopper (207) and the bottom of the reaction tank (100) for conveying and discharging sediment.

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