CN117125860A - Nickel-containing electroplating wastewater zero-emission facility and process - Google Patents

Nickel-containing electroplating wastewater zero-emission facility and process Download PDF

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Publication number
CN117125860A
CN117125860A CN202311303316.3A CN202311303316A CN117125860A CN 117125860 A CN117125860 A CN 117125860A CN 202311303316 A CN202311303316 A CN 202311303316A CN 117125860 A CN117125860 A CN 117125860A
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filter
water
tank
plate
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CN117125860B (en
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李雪君
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Shanghai Canxing Environmental Technology Co ltd
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Shanghai Canxing Environmental Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048—Purification of waste water by evaporation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5281—Installations for water purification using chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F2001/007—Processes including a sedimentation step
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/06—Controlling or monitoring parameters in water treatment pH
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Filtration Of Liquid (AREA)

Abstract

The invention belongs to the technical field of wastewater treatment, in particular to a zero discharge facility and a zero discharge process for electroplating nickel-containing wastewater, comprising the following steps: s1: raw water enters an adjusting tank by a pump, sodium hydroxide is added into the adjusting tank to adjust the pH value to be 9-10, the alkaline environment is then entered into a coagulation tank, PAC is added into the coagulation tank, the mixture is fully stirred and then entered into a flocculation tank, and PAM is added into the flocculation tank and fully precipitated; s2: the water added with PAM is subjected to filter pressing operation in a guide plate frame filter press of a water inlet pipe, when raw water flows in the water inlet pipe, the spiral blades are driven to rotate, the flexible plates are hit when the spiral blades rotate, the flexible plates shake and are matched with the spiral blades to stir water flow, and the raw water added with PAM is stirred, so that the raw water and the PAM are further fully mixed; s3: and after the precipitated sludge is subjected to filter pressing by a plate-and-frame filter press, the filter pressing effluent is returned to the raw water tank for treatment again, and the supernatant fluid of the precipitation tank enters the equalizing tank and is added with HCL to adjust the pH value to 7-8.

Description

Nickel-containing electroplating wastewater zero-emission facility and process
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a zero-emission facility and a zero-emission process for electroplating nickel-containing wastewater.
Background
Nickel plating is widely used in plating production because of its excellent wear resistance, corrosion resistance, solderability, and its processing amount is inferior to zinc plating, which is the second place in the whole plating industry. A large amount of nickel-containing wastewater is generated in the nickel plating process.
One patent of Chinese patent application CN113415936A discloses a zero discharge process of electroplating nickel-containing wastewater, which has the technical scheme that: the method comprises a pretreatment process, a membrane concentration system and an evaporative crystallization system, wherein the evaporative crystallization system comprises a pump, a low-temperature normal-pressure evaporation system and a crystallizer. The beneficial effects of the invention are as follows: continuous and stable operation can be realized; secondary pollution can not be generated; the evaporation temperature of the low-temperature normal-pressure evaporation system is low, the energy consumption is low, and the running cost of the whole treatment process is low; the zero emission of nickel ions can be realized by matching with a low-temperature normal-pressure evaporation technology.
However, the above-mentioned techniques often have the following drawbacks: the plate-and-frame filter press can be used in the zero discharge process of the nickel-containing electroplating wastewater, when the plate-and-frame filter press is used, wastewater is added into the PAM and then is guided into the plate-and-frame filter press, and the wastewater added with the PAM is often mixed insufficiently, so that the formed precipitate in the wastewater is less and still contains partial impurities, and the filter pressing effect of the plate-and-frame filter press is affected.
Therefore, the invention provides a zero discharge facility and process for nickel-containing electroplating wastewater.
Disclosure of Invention
In order to overcome the deficiencies of the prior art, at least one technical problem presented in the background art is solved.
The technical scheme adopted for solving the technical problems is as follows: the invention relates to a zero discharge process for nickel-containing electroplating wastewater, which comprises the following steps:
s1: raw water enters an adjusting tank by a pump, sodium hydroxide is added into the adjusting tank to adjust the pH value to be 9-10, the alkaline environment is then entered into a coagulation tank, PAC is added into the coagulation tank, the mixture is fully stirred and then entered into a flocculation tank, and PAM is added into the flocculation tank and fully precipitated;
s2: the water added with PAM is subjected to filter pressing operation in a guide plate frame filter press of a water inlet pipe, when raw water flows in the water inlet pipe, the spiral blades are driven to rotate, the flexible plates are hit when the spiral blades rotate, the flexible plates shake and are matched with the spiral blades to stir water flow, and the raw water added with PAM is stirred, so that the raw water and the PAM are further fully mixed;
s3: after the precipitated sludge is subjected to filter pressing by a plate-and-frame filter press, filter pressing effluent is returned to a raw water tank for treatment again, supernatant fluid of the precipitation tank enters an equalizing tank, and HCL is added to adjust the pH value to 7-8;
s4: concentrating the treated water by a membrane, performing primary microfiltration by a cartridge filter to remove suspended matters with the size of more than 1 mu m, and enabling the effluent of the cartridge filter to enter an RO membrane system by a high-pressure pump to remove most inorganic salts, organic matters, microorganisms and the like;
s5: and (3) evaporating and crystallizing the water after membrane concentration, enabling the water after membrane concentration to enter a concentrated water tank, enabling the water to enter a low-temperature normal-pressure evaporation system through a pump, recycling or directly discharging the evaporated water, enabling the evaporated concentrated liquid to enter a crystallizer, enabling the generated crystals to enter solid waste generated after separation of a centrifugal machine, enabling mother liquor to enter a reaction kettle for circular evaporation, and finally completing discharging.
The utility model provides an electroplating nickel-containing wastewater zero release facility, this facility is applied to above-mentioned electroplating nickel-containing wastewater zero release technology, plate-and-frame filter press includes the equipment rack, the surface of equipment rack is provided with the driving piece, the fixed mounting of surface of equipment rack has the baffle, the surface of equipment rack is provided with the inlet tube, the surface of equipment rack is provided with a set of filter plate, the surface of filter plate is provided with the filter cloth, the inside of inlet tube is provided with the locating shaft, the surface of locating shaft is provided with the helical blade, the inner wall fixed mounting of inlet tube has the flexible sheet;
when the plate-and-frame filter press is used, wastewater is added into the PAM and then is guided into the plate-and-frame filter press, and the wastewater added with the PAM is often less in sediment formed in the wastewater and still contains partial impurities due to insufficient mixing, so that the filter pressing effect of the plate-and-frame filter press is affected.
Preferably, the inner wall of the water inlet pipe is fixedly provided with a positioning block, the positioning shaft is in sliding connection with the inner wall of the positioning block, the surface of the positioning shaft is fixedly provided with an elastic rope, and the other end of the elastic rope is fixedly connected with the inner wall of the water inlet pipe; when water passes through the water inlet pipe and contacts with the spiral blades, impurities are contained in raw water, and the impurities are in continuous contact with the spiral blades to collide with the elastic ropes and are matched with the elastic ropes, so that the positioning shafts can be driven to slide in the positioning blocks continuously, and the effect of the spiral blades in stirring the raw water is improved.
Preferably, the surface of the filter plate is fixedly provided with an air pump, the surface of the filter plate is provided with a group of curved air bags (the working process is similar to that of a blowing dragon), the curved air bags are communicated with the air pump, and the curved air bags have elasticity; in-process that the filter plate was being processed, the filter cake can be formed in the filter plate to the impurity, after the filter-pressing, start the air pump, the air current that the air pump produced gets into in the curved air pocket for curved air pocket is stretched out, extrudees the filter residue, first, can extrude the interior remaining water of filter residue, improve the filter effect, on the other hand can be with filter residue extrusion, be convenient for retrieve, and can start the air pump before carrying out the filter-pressing to the raw water, make curved air pocket expand back and extrude the stretching to the filter cloth, make the filter cloth can not appear the fold, guarantee the normal operating of equipment, close the air pump after curved air pocket uses, curved air pocket can resume to be the frizzled.
Preferably, the filter plates are fixedly connected through connecting ropes; when the filter cake in the filter plate is required to be taken out, one filter plate close to one side of the driving piece is moved, and the filter plate moves on the adjacent side by driving the connecting rope when the filter plate moves on the equipment frame, so that the filter plates are separated, the filter cake in the filter plate can be taken out, and the working efficiency of the equipment is improved.
Preferably, a connecting pipe is arranged in the filter cloth, the connecting pipe is fixedly connected with the air pump, a one-way valve is arranged between the curved air bag and the air pump, and a group of elastic bronchus is fixedly arranged on the surface of the connecting pipe; after each filter plate is mutually far away, the air pump is started, air generated by the air pump is filled into the elastic bronchus through the connecting pipe, the elastic bronchus is filled with air and expanded, the expanded elastic bronchus deforms filter cloth, and the filter cake formed in the filter plate is driven to move, so that the effect of rapidly removing the filter cake from the filter plate is achieved.
Preferably, a collecting box is fixedly arranged on the surface of the equipment rack, and the collecting box is arranged right below the filter plate; after the filter cakes in the filter plates fall, the filter cakes vertically fall into the collecting box to be collected, and a manual mobile phone is not needed in the process, so that the filter cakes are convenient to use.
Preferably, a driving motor is fixedly arranged on the surface of the collecting box, a spiral plate is fixedly arranged at the output end of the driving motor, a group of extrusion rods are fixedly arranged on the surface of the spiral plate, a group of spines are fixedly arranged on the surface of the extrusion rods, and a discharge hole is formed in the surface of the collecting box; when the filter cake enters the collecting box, the driving motor is started, the output end of the driving motor drives the spiral plate to rotate, the spiral plate is matched with the extrusion rod and the spike to extrude and crush the filter cake, and then the filter cake is discharged after being discharged along the discharging process by the pushing of the spiral plate, so that the filter cake crushing treatment is achieved, and the follow-up procedure is convenient to carry out.
Preferably, a cleaning water pipe is fixedly arranged on the surface of the equipment rack, spray holes are formed in the surface of the cleaning water pipe, and the filter plate is positioned right below the spray holes; after the filter plate is used, the valve of the cleaning water pipe is opened, water in the cleaning water pipe is sprayed out along the spray holes and is sprayed to the filter plate, the filter plate is cleaned, residual filter cake residues are cleaned, and the filter cake is prevented from affecting the next use of the filter plate.
Preferably, a plurality of pairs of elastic strips are fixedly arranged on the inner wall of the cleaning water pipe, diffusion blocks are fixedly arranged at the other ends of the elastic strips, the diffusion blocks are positioned in the spray holes, and through grooves are formed in the surfaces of the diffusion blocks; the cleaning water sprayed out of the spray hole contacts with the diffusion block and drives the diffusion block to move, the diffusion block stretches and bounces and changes positions when moving, the diffusion block can achieve the diffusion effect on water flow, the cleaning effect is improved, and the through groove is arranged so that the diffusion block can not influence the cleaning effect under the spray hole.
The beneficial effects of the invention are as follows:
1. according to the zero discharge facility and process for the nickel-containing electroplating wastewater, the raw water added with the PAM is subjected to filter pressing operation in the guide plate frame filter press through the water inlet pipe, the spiral blades are driven to rotate in the flowing process of the raw water in the water inlet pipe, the flexible plates are hit when the spiral blades rotate, shake and match with the spiral blades, water flow is stirred, the raw water added with the PAM is stirred, the raw water and the PAM are further fully mixed, substances in the raw water are easier to form precipitation and are convenient to squeeze and filter by the filter press, the filter press can fully exert the filter pressing effect of the filter press, the subsequent treatment procedures are reduced, the treatment cost is reduced, the filter cake obtained after the filter pressing is easy to carry out centralized treatment, and the harm of secondary pollution is reduced.
2. According to the zero discharge facility and process for the nickel-containing electroplating wastewater, when water passes through the water inlet pipe and contacts with the spiral blades, impurities are contained in raw water, and can continuously collide with the spiral blades in a contact manner and are matched with the elastic ropes, so that the positioning shaft can be driven to continuously slide in the positioning blocks, and the effect of stirring the raw water by the spiral blades is improved.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic overall construction of the present invention;
FIG. 3 is a schematic view of the positioning shaft of the present invention;
FIG. 4 is a schematic view of the structure of a filter plate of the present invention;
FIG. 5 is a schematic view of the structure of the curved air bag of the present invention;
FIG. 6 is a schematic view of the structure of the elastic bronchus of the present invention;
FIG. 7 is a schematic view of the structure of the spiral plate of the present invention;
fig. 8 is a schematic view of the structure of a diffusion block in the present invention.
In the figure: 1. an equipment rack; 2. a filter plate; 3. a filter cloth; 4. a driving member; 5. a baffle; 6. a water inlet pipe; 7. positioning a shaft; 8. spiral leaves; 9. a flexible board; 10. a positioning block; 11. an elastic rope; 12. an air pump; 13. a curved air bag; 14. a connecting rope; 15. a connecting pipe; 16. an elastic bronchus; 17. a collection box; 18. a driving motor; 19. a spiral plate; 20. a discharge port; 21. an extrusion rod; 22. spike; 23. cleaning a water pipe; 24. a spray hole; 25. spring strips; 26. a diffusion block; 27. and (5) through grooves.
Detailed Description
The invention is further described in connection with the following detailed description in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in FIG. 1, the zero discharge process of the nickel-containing electroplating wastewater comprises the following steps:
s1: raw water enters an adjusting tank by a pump, sodium hydroxide is added into the adjusting tank to adjust the pH value to be 9-10, the alkaline environment is then entered into a coagulation tank, PAC is added into the coagulation tank, the mixture is fully stirred and then entered into a flocculation tank, and PAM is added into the flocculation tank and fully precipitated;
s2: the water added with PAM is subjected to filter pressing operation in a guide plate frame filter press through a water inlet pipe 6, when raw water flows in the water inlet pipe 6, the spiral blade 8 is driven to rotate, the flexible plate 9 is hit when the spiral blade 8 rotates, the flexible plate 9 shakes and is matched with the spiral blade 8, water flow is stirred, and the raw water added with PAM is stirred, so that the raw water and the PAM are further fully mixed;
s3: after the precipitated sludge is subjected to filter pressing by a plate-and-frame filter press, filter pressing effluent is returned to a raw water tank for treatment again, supernatant fluid of the precipitation tank enters an equalizing tank, and HCL is added to adjust the pH value to 7-8;
s4: concentrating the treated water by a membrane, performing primary microfiltration by a cartridge filter to remove suspended matters with the size of more than 1 mu m, and enabling the effluent of the cartridge filter to enter an RO membrane system by a high-pressure pump to remove most inorganic salts, organic matters, microorganisms and the like;
s5: and (3) evaporating and crystallizing the water after membrane concentration, enabling the water after membrane concentration to enter a concentrated water tank, enabling the water to enter a low-temperature normal-pressure evaporation system through a pump, recycling or directly discharging the evaporated water, enabling the evaporated concentrated liquid to enter a crystallizer, enabling the generated crystals to enter solid waste generated after separation of a centrifugal machine, enabling mother liquor to enter a reaction kettle for circular evaporation, and finally completing discharging.
Embodiment one: as shown in fig. 2 to 7, the zero-discharge facility for nickel-containing electroplating wastewater according to the embodiment of the invention is applied to the zero-discharge process for nickel-containing electroplating wastewater, and the plate-and-frame filter press comprises an equipment frame 1, wherein a driving piece 4 is arranged on the surface of the equipment frame 1, a baffle 5 is fixedly arranged on the surface of the equipment frame 1, a water inlet pipe 6 is arranged on the surface of the equipment frame 1, a group of filter plates 2 are arranged on the surface of the equipment frame 1, filter cloth 3 is arranged on the surface of the filter plates 2, a positioning shaft 7 is arranged inside the water inlet pipe 6, a spiral blade 8 is arranged on the surface of the positioning shaft 7, and a flexible plate 9 is fixedly arranged on the inner wall of the water inlet pipe 6;
when the plate-and-frame filter press is used in the zero discharge process of the nickel-containing electroplating wastewater, the wastewater is added into the PAM and then is guided into the plate-and-frame filter press, and the wastewater added with the PAM is often less in sediment formed in the wastewater and still contains partial impurities due to insufficient mixing, so that the filter pressing effect of the plate-and-frame filter press is affected.
The inner wall of the water inlet pipe 6 is fixedly provided with a positioning block 10, the positioning shaft 7 is in sliding connection with the inner wall of the positioning block 10, the surface of the positioning shaft 7 is fixedly provided with an elastic rope 11, and the other end of the elastic rope 11 is fixedly connected with the inner wall of the water inlet pipe 6; when water passes through the water inlet pipe 6 and contacts with the spiral blade 8, impurities are contained in raw water, and the impurities are in continuous contact with the spiral blade 8 and collide with the elastic rope 11 to be matched with each other, so that the positioning shaft 7 can be driven to continuously slide in the positioning block 10, and the effect of the spiral blade 8 in stirring raw water is improved.
The surface of the filter plate 2 is fixedly provided with an air pump 12, the surface of the filter plate 2 is provided with a group of curved air bags 13 (the working process is similar to that of a blowing dragon), the curved air bags 13 are communicated with the air pump 12, and the curved air bags 13 have elasticity; in the process of processing the filter plate 2, the filter cake can be formed in the filter plate 2 by impurities, after the filter pressing is finished, the air pump 12 is started, the air flow generated by the air pump 12 enters the curved air bag 13, so that the curved air bag 13 is unfolded, the filter residue is extruded, firstly, residual water in the filter residue can be extruded, the filtering effect is improved, and on the other hand, the filter residue can be extruded and formed, the filter residue is convenient to recycle, and the air pump 12 can be started before the raw water is subjected to the filter pressing, so that the filter cloth 3 is extruded and unfolded after the curved air bag 13 is expanded, the filter cloth 3 cannot be folded, the normal operation of equipment is ensured, the air pump 12 is closed after the curved air bag 13 is used, and the curved air bag 13 can recover to be in a curled shape.
Wherein, the filter plates 2 are fixedly connected through connecting ropes 14; when the filter cake in the filter plate 2 is required to be taken out, one filter plate 2 close to one side of the driving piece 4 is moved, and when the filter plate 2 moves on the equipment frame 1, the filter plate 2 on the adjacent side is driven to move through the connecting rope 14, and the actions are repeated continuously, so that the filter cakes in the filter plates 2 can be separated from each other, and then the filter cake in the filter plate 2 can be taken out, and the working efficiency of the equipment is improved.
Wherein, a connecting pipe 15 is arranged in the filter cloth 3, the connecting pipe 15 is fixedly connected with the air pump 12, a one-way valve is arranged between the curved air bag 13 and the air pump 12, and a group of elastic bronchus 16 are fixedly arranged on the surface of the connecting pipe 15; after each filter plate 2 is mutually far away, the air pump 12 is started, air generated by the air pump 12 is filled into the elastic bronchus 16 through the connecting pipe 15, and then the elastic bronchus 16 is filled with air and expanded, the expanded elastic bronchus 16 deforms the filter cloth 3, and the filter cake formed in the filter plate 2 is driven to move, so that the effect of rapidly removing the filter cake from the filter plate 2 is achieved.
Wherein, the surface of the equipment rack 1 is fixedly provided with a collecting box 17, and the collecting box 17 is arranged right below the filter plate 2; after the filter cake in the filter plate 2 falls, the filter cake vertically falls into the collecting box 17 to be collected, and a manual mobile phone is not needed in the process, so that the filter cake is convenient to use.
The surface of the collecting box 17 is fixedly provided with a driving motor 18, the output end of the driving motor 18 is fixedly provided with a spiral plate 19, the surface of the spiral plate 19 is fixedly provided with a group of extrusion rods 21, the surface of the extrusion rods 21 is fixedly provided with a group of spines 22, and the surface of the collecting box 17 is provided with a discharge hole 20; when the filter cake enters the collecting box 17, the driving motor 18 is started, the output end of the driving motor 18 drives the spiral plate 19 to rotate, the spiral plate 19 is matched with the extrusion rod 21 and the spike 22 to extrude and crush the filter cake, and then the filter cake is pushed by the spiral plate 19 to be discharged along the discharging, so that the filter cake crushing treatment is achieved, and the follow-up procedure is convenient to carry out.
The surface of the equipment rack 1 is fixedly provided with a cleaning water pipe 23, a spray hole 24 is formed in the surface of the cleaning water pipe 23, and the filter plate 2 is positioned right below the spray hole 24; after the filter plate 2 is used, the valve of the cleaning water pipe 23 is opened, water in the cleaning water pipe 23 is sprayed out along the spray holes 24 and sprayed to the filter plate 2, the filter plate 2 is cleaned, residual filter cake residues are cleaned, and the filter cake is prevented from affecting the next use of the filter plate 2.
Embodiment two: as shown in fig. 8, in comparative example one, another embodiment of the present invention is: the inner wall of the cleaning water pipe 23 is fixedly provided with a plurality of pairs of elastic strips 25, the other ends of the elastic strips 25 are fixedly provided with diffusion blocks 26, the diffusion blocks 26 are positioned in the spray holes 24, and the surfaces of the diffusion blocks 26 are provided with through grooves 27; the cleaning water sprayed from the spray hole 24 contacts with the diffusion block 26 and drives the diffusion block 26 to move, the diffusion block 26 stretches and bounces and changes positions when moving, the diffusion block 26 can achieve the diffusion effect on water flow, the cleaning effect is improved, and the through groove 27 is arranged so that the diffusion block 26 can not influence the cleaning effect under the spray hole 24.
Working principle: according to the invention, raw water added with PAM is guided into the plate-and-frame filter press through the water inlet pipe 6 to carry out filter pressing operation, when raw water flows in the water inlet pipe 6, the spiral blade 8 is driven to rotate, the flexible plate 9 is hit when the spiral blade 8 rotates, the flexible plate 9 shakes and cooperates with the spiral blade 8 to stir water flow, the raw water added with PAM is stirred, so that the raw water and the PAM are further fully mixed, substances in the raw water are easier to form precipitation, the raw water is convenient to be squeezed and filtered by the filter press, the filter press can fully exert the filter pressing effect of the raw water, the subsequent treatment procedures are reduced, the treatment cost is reduced, the filter cake obtained after filter pressing is easy to carry out centralized treatment, and the harm of secondary pollution is reduced; when water passes through the water inlet pipe 6 and contacts with the spiral blade 8, impurities are contained in raw water, and the impurities are in continuous contact collision with the spiral blade 8 and are matched with the elastic rope 11, so that the positioning shaft 7 is driven to continuously slide in the positioning block 10, and the effect of the spiral blade 8 in stirring raw water is improved; in the processing process of the filter plate 2, impurities can form a filter cake in the filter plate 2, after the filter pressing is finished, an air pump 12 is started, air flow generated by the air pump 12 enters a curved air bag 13, so that the curved air bag 13 is unfolded, filter residues are extruded, firstly, residual water in the filter residues can be extruded, the filtering effect is improved, on the other hand, the filter residues can be extruded and formed, the filter residues are convenient to recycle, and the air pump 12 can be started before the raw water is subjected to the filter pressing, so that the curved air bag 13 is expanded, the filter cloth 3 is extruded and unfolded, the filter cloth 3 is prevented from being wrinkled, the normal operation of equipment is ensured, the air pump 12 is closed after the curved air bag 13 is used, and the curved air bag 13 can be recovered to be curled;
when the filter cake in the filter plates 2 is required to be taken out, one filter plate 2 close to one side of the driving piece 4 is moved, and when the filter plates 2 move on the equipment frame 1, the filter plates 2 on the adjacent side are driven to move through the connecting rope 14, and the actions are repeated continuously, so that the filter plates 2 are separated, the filter cake in the filter plates 2 can be taken out immediately, and the working efficiency of the equipment is improved; when the filter plates 2 are far away from each other, the air pump 12 is started, air generated by the air pump 12 is filled into the elastic bronchi 16 through the connecting pipe 15, and then the elastic bronchi 16 are filled with air and expand, the expanded elastic bronchi 16 deform the filter cloth 3 to drive the filter cake formed in the filter plates 2 to move, so that the effect of rapidly removing the filter cake from the filter plates 2 is achieved; after the filter cake in the filter plate 2 falls, the filter cake vertically falls into the collecting box 17 to be collected, and a manual mobile phone is not needed in the process, so that the filter cake is convenient to use; when the filter cake enters the collecting box 17, the driving motor 18 is started, the output end of the driving motor 18 drives the spiral plate 19 to rotate, the spiral plate 19 is matched with the extrusion rod 21 and the spike 22 to extrude and crush the filter cake, and then the filter cake is discharged after being pushed by the spiral plate 19 along the discharging, so that the filter cake crushing treatment is realized, and the follow-up procedure is convenient to carry out;
after the filter plate 2 is used, a valve of the cleaning water pipe 23 is opened, water in the cleaning water pipe 23 is sprayed out along the spray holes 24 and is sprayed to the filter plate 2, the filter plate 2 is cleaned, residual filter cake residues are cleaned, and the filter cake is prevented from affecting the next use of the filter plate 2; the cleaning water sprayed from the spray hole 24 contacts with the diffusion block 26 and drives the diffusion block 26 to move, the diffusion block 26 stretches and bounces and changes positions when moving, the diffusion block 26 can achieve the diffusion effect on water flow, the cleaning effect is improved, and the through groove 27 is arranged so that the diffusion block 26 can not influence the cleaning effect under the spray hole 24.
The front, rear, left, right, up and down are all based on fig. 1 in the drawings of the specification, the face of the device facing the observer is defined as front, the left side of the observer is defined as left, and so on, according to the viewing angle of the person.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. A zero discharge process of electroplating nickel-containing wastewater is characterized in that: the process comprises the following steps:
s1: raw water enters an adjusting tank by a pump, sodium hydroxide is added into the adjusting tank to adjust the pH value to be 9-10, the alkaline environment is then entered into a coagulation tank, PAC is added into the coagulation tank, the mixture is fully stirred and then entered into a flocculation tank, and PAM is added into the flocculation tank and fully precipitated;
s2: the water added with PAM is guided into the plate-and-frame filter press through the water inlet pipe (6) to carry out filter pressing operation, when raw water flows in the water inlet pipe (6), the spiral blade (8) is driven to rotate, the spiral blade (8) is hit against the flexible plate (9) when rotating, the flexible plate (9) shakes to be matched with the spiral blade (8), water flow is stirred, and the raw water added with PAM is stirred, so that the raw water and the PAM are further fully mixed;
s3: after the precipitated sludge is subjected to filter pressing by a plate-and-frame filter press, filter pressing effluent is returned to a raw water tank for treatment again, supernatant fluid of the precipitation tank enters an equalizing tank, and HCL is added to adjust the pH value to 7-8;
s4: concentrating the treated water by a membrane, performing primary microfiltration by a cartridge filter to remove suspended matters with the size of more than 1 mu m, and enabling the effluent of the cartridge filter to enter an RO membrane system by a high-pressure pump to remove most inorganic salts, organic matters, microorganisms and the like;
s5: and (3) evaporating and crystallizing the water after membrane concentration, enabling the water after membrane concentration to enter a concentrated water tank, enabling the water to enter a low-temperature normal-pressure evaporation system through a pump, recycling or directly discharging the evaporated water, enabling the evaporated concentrated liquid to enter a crystallizer, enabling the generated crystals to enter solid waste generated after separation of a centrifugal machine, enabling mother liquor to enter a reaction kettle for circular evaporation, and finally completing discharging.
2. A zero-discharge facility for nickel-containing electroplating wastewater, which is applied to the zero-discharge process for nickel-containing electroplating wastewater according to claim 1, and is characterized in that: the plate-and-frame filter press comprises an equipment frame (1), a driving piece (4) is arranged on the surface of the equipment frame (1), a baffle (5) is fixedly arranged on the surface of the equipment frame (1), a water inlet pipe (6) is arranged on the surface of the equipment frame (1), a group of filter plates (2) are arranged on the surface of the equipment frame (1), filter cloth (3) is arranged on the surface of each filter plate (2), a positioning shaft (7) is arranged in the water inlet pipe (6), a spiral blade (8) is arranged on the surface of the positioning shaft (7), and a flexible plate (9) is fixedly arranged on the inner wall of the water inlet pipe (6).
3. The electroplating nickel-containing wastewater zero-emission facility according to claim 2, wherein: the water inlet pipe is characterized in that a positioning block (10) is fixedly arranged on the inner wall of the water inlet pipe (6), the positioning shaft (7) is in sliding connection with the inner wall of the positioning block (10), an elastic rope (11) is fixedly arranged on the surface of the positioning shaft (7), and the other end of the elastic rope (11) is fixedly connected with the inner wall of the water inlet pipe (6).
4. A zero-emission electroplating nickel-containing wastewater facility according to claim 3, wherein: the surface of filter plate (2) is all fixed mounting has air pump (12), the surface of filter plate (2) all is provided with a set of curved air pocket (13), be linked together between curved air pocket (13) and air pump (12), curved air pocket (13) have elasticity.
5. The zero-emission electroplating nickel-containing wastewater facility according to claim 4, wherein: the filter plates (2) are fixedly connected through connecting ropes (14).
6. The zero-emission electroplating nickel-containing wastewater facility according to claim 5, wherein: the inside of filter cloth (3) is provided with connecting pipe (15), fixed connection between connecting pipe (15) and air pump (12), be provided with the check valve between curved air pocket (13) and air pump (12), the surface fixed mounting of connecting pipe (15) has a set of elasticity bronchus (16).
7. The electroplating nickel-containing wastewater zero release facility according to claim 6, wherein: the surface of the equipment rack (1) is fixedly provided with a collecting box (17), and the collecting box (17) is arranged right below the filter plate (2).
8. The electroplating nickel-containing wastewater zero release facility according to claim 7, wherein: the surface fixed mounting of collection box (17) has driving motor (18), the output fixed mounting of driving motor (18) has screw plate (19), the surface fixed mounting of screw plate (19) has a set of extrusion pole (21), the surface fixed mounting of extrusion pole (21) has a set of spike (22), discharge gate (20) have been seted up on the surface of collection box (17).
9. The electroplating nickel-containing wastewater zero release facility according to claim 8, wherein: the surface of the equipment rack (1) is fixedly provided with a cleaning water pipe (23), the surface of the cleaning water pipe (23) is provided with spray holes (24), and the filter plate (2) is positioned under the spray holes (24).
10. The electroplating nickel-containing wastewater zero release facility according to claim 9, wherein: the inner wall fixed mounting of clean water pipe (23) has many pairs of bullet strip (25), the other end of bullet strip (25) is all fixed mounting has diffusion piece (26), diffusion piece (26) are located orifice (24), logical groove (27) have been seted up on the surface of diffusion piece (26).
CN202311303316.3A 2023-10-09 2023-10-09 Nickel-containing electroplating wastewater zero-emission facility and process Active CN117125860B (en)

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GB1229039A (en) * 1967-09-27 1971-04-21
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CN219355368U (en) * 2022-11-23 2023-07-18 江西三石有色金属有限公司 High-efficiency membrane filter press

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