CN111455444A - Treatment device and method for fully recycling electroplating rinse water - Google Patents
Treatment device and method for fully recycling electroplating rinse water Download PDFInfo
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- CN111455444A CN111455444A CN202010210907.6A CN202010210907A CN111455444A CN 111455444 A CN111455444 A CN 111455444A CN 202010210907 A CN202010210907 A CN 202010210907A CN 111455444 A CN111455444 A CN 111455444A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 126
- 238000009713 electroplating Methods 0.000 title claims abstract description 78
- 238000004064 recycling Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 39
- 239000007921 spray Substances 0.000 claims abstract description 123
- 238000011084 recovery Methods 0.000 claims abstract description 61
- 238000007747 plating Methods 0.000 claims abstract description 57
- 238000005507 spraying Methods 0.000 claims description 54
- 239000007788 liquid Substances 0.000 claims description 41
- 239000008237 rinsing water Substances 0.000 claims description 29
- 239000012528 membrane Substances 0.000 claims description 24
- 230000001276 controlling effect Effects 0.000 claims description 17
- 239000004033 plastic Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 238000001704 evaporation Methods 0.000 claims description 9
- 230000008020 evaporation Effects 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 239000002699 waste material Substances 0.000 claims description 8
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 238000005485 electric heating Methods 0.000 claims description 6
- -1 polypropylene Polymers 0.000 claims description 6
- 229920001155 polypropylene Polymers 0.000 claims description 6
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 6
- 239000004800 polyvinyl chloride Substances 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 239000013505 freshwater Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 description 35
- 238000004140 cleaning Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/16—Regeneration of process solutions
- C25D21/20—Regeneration of process solutions of rinse-solutions
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemically Coating (AREA)
Abstract
The invention relates to a treatment device for fully recycling electroplating rinse water, which comprises a spray concentration system device, a countercurrent rinsing concentration system and a plating tank, wherein the spray concentration system device comprises a first water pump, a spray tank, a nozzle and a spray recovery tank, the spray tank is communicated with the plating tank through a first pipeline, a three-way valve is arranged on the first pipeline, the nozzle is arranged in the spray tank, the spray recovery tank is arranged below the spray tank and is communicated with the bottom of the spray tank through a second pipeline, the spray recovery tank is also connected with the three-way valve through a third pipeline, and the third pipeline is provided with the first water pump.
Description
Technical Field
The invention relates to a treatment device and a treatment method for realizing zero discharge of rinsing water, in particular to a treatment device and a treatment method for realizing the zero discharge of the rinsing water by realizing the full recycling of electroplating rinsing by a circulating spray concentration method.
Background
Electroplating is one of industrial industries with strong universality and wide application range, and almost all industrial departments have electroplating processing in a certain range. However, the electroplating industrial wastewater has great harm to the environment, and different electroplating processes can generate different electroplating wastewater, which mainly comprises wastewater generated before electroplating, waste liquid generated in the electroplating process of plated parts and electroplating rinsing wastewater generated by cleaning of plated parts after electroplating. But the method for treating the electroplating wastewater in the traditional industry has certain limitations, the process has the advantages of controlling the source of the electroplating wastewater, realizing the recycling of the plating solution and saving water, and the like, solves the problems and the defects in the prior art, and provides the device for realizing the zero discharge of the electroplating rinsing full recycling water by the circulating spraying method.
Electroplating is one of three major global pollution industries, and according to incomplete statistics, more than twenty thousand electroplating sites are developed in China so far, and the amount of wastewater generated each year exceeds 4 billion cubic meters. Compared with other industries, the electroplating wastewater has relatively less wastewater amount, but has extremely strong toxicity, is difficult to carry out biochemical treatment, is distributed in a point source manner, and is difficult to carry out unified centralized treatment. The rinsing wastewater of the plated part is an important source of electroplating wastewater, and most of pollutants in the wastewater are generated when the pollutants are brought into a rinsing tank from an electroplating tank from the surface of the plated part, and account for more than 85% of the discharge amount of the wastewater in a workshop. The waste water generated by the plating solution filtration is mainly the discharged water of the plating solution and the like which is leaked in the plating solution filtration process and some waste liquid discharged when the plating tank is cleaned. The waste liquid is collected as much as possible to be purified and recycled, and the high concentration of the waste liquid cannot be treated well, so that the waste liquid has great harm to the environment. Various technologies for eliminating and reducing emissions are continuously developed in many countries in the world, and the technologies are roughly simplified into non-toxic treatment, harmless treatment, non-hazardous treatment, precious metal recovery, one-water multi-purpose treatment, recycling and the like, and the traditional industrial method for treating electroplating wastewater has certain limitations.
The process research for realizing electroplating rinsing full recycling by the project circulating spray concentration method is to apply a circulating spray technology in circulating cooling water to electroplating rinsing water, and is formed by improving on the basis of the treatment device and method for realizing electroplating wastewater zero discharge by the circulating spray method in the patent originally applied by the inventor. The original patent has some limitations, mainly including the defects that the spraying number is too many, the time is long, the efficiency is low, when the shape of the electroplated workpiece is complex, the workpiece cannot be cleaned, the concentration of the recovered solution cannot reach the concentration of the plating solution in the plating tank, and the like. This project is through keeping the washing tank that sprays in former patent, the multistage accumulator that sprays below the groove that sprays in former patent reduces to the one-level, thereby it adds a heating temperature regulating device to spray the accumulator below and thereby quickens the plating bath concentration to realize getting back to the coating bath behind the potcher after potcher concentration reaches the coating bath concentration in the coating bath, increase two adverse current potshers at the back of the washing tank that sprays, thereby it is too many to have solved the series of levels, can not wash totally when long-term inefficiency and electroplating work piece shape are complicated, the recovery liquid concentration can not reach plating bath concentration scheduling problem in the coating bath. The method is not reported for treating the electroplating wastewater at home at present, the process only needs a circulating spray system and a countercurrent rinsing system, the principle is to realize concentration by spraying and evaporating for many times, the concentration speed is far higher than that of countercurrent rinsing in a rinsing tank, and meanwhile, a spray device is used to save space compared with the rinsing tank, so the operation cost is definitely lower than that of a countercurrent rinsing method. In principle, the zero discharge of the electroplating rinse water can be realized by the circulating spray device; the water which is circularly concentrated to reach the concentration of the plating solution is returned to the plating tank, and zero emission of the whole electroplating process can be realized. Compared with the prior membrane separation technology, the process device is simple, the equipment maintenance and management are easy, the operating cost is low, the one-time investment is small, and the process device can bear the load of medium and small electroplating enterprises. Therefore, the research of the project is significant and has good application prospect.
Disclosure of Invention
The invention solves the problems and the defects in the prior art, and provides the treatment device for realizing the zero discharge of the electroplating wastewater by the circulating spray concentration method.
In order to solve the technical problem, the invention provides a treatment device for fully recycling electroplating rinse water, which is characterized in that: the device comprises a spray concentration system device, a countercurrent rinsing concentration system and a plating bath, wherein the spray concentration system device comprises a first water pump, a spray tank, a nozzle and a spray recovery tank, the spray tank is communicated with the plating bath through a first pipeline, a three-way valve is arranged on the first pipeline, the nozzle is arranged in the spray tank, the spray recovery tank is arranged below the spray tank and is communicated with the bottom of the spray tank through a second pipeline, the spray recovery tank is also connected with the three-way valve through a third pipeline, the third pipeline is provided with the first water pump, the countercurrent rinsing concentration system comprises an countercurrent rinsing tank, an overflow recovery tank, a membrane concentration device, a high-level pure water tank, a concentrated water tank, an overflow pipe, a second water pump and a third water pump, the high-level pure water tank is communicated with the countercurrent rinsing tank through a water inlet pipe, the countercurrent rinsing tank is communicated with the overflow recovery tank through an overflow pipe, the overflow recovery tank is communicated with the membrane concentration device through a fourth pipeline, the second water pump is installed on the fourth pipeline, the membrane concentration device is communicated with the high-level pure water tank through a fifth pipeline, the membrane concentration device is further communicated with the concentrated water tank through a sixth pipeline, the concentrated water tank is communicated with the spray recovery tank through a seventh pipeline, and the third water pump is installed on the seventh pipeline.
Further: the spraying groove is internally provided with a U-shaped spraying pipe, and the inner walls of two sections of parallel pipelines on the U-shaped spraying pipe are respectively provided with a plurality of nozzles.
And further: the spray recovery tank in still be provided with temperature regulating device, temperature regulating device constitute by electric heating pipe and temperature sensor, electric heating pipe and temperature sensor be connected with the controller electricity respectively, the spray tank with spray the recovery tank in all be provided with temperature sensor.
And further: the countercurrent rinsing tank is composed of a first countercurrent rinsing tank and a second countercurrent rinsing tank, the second countercurrent rinsing tank is connected with the high-level pure water tank through a water inlet pipe, the first countercurrent rinsing tank is connected with the overflow recovery tank through an overflow pipe, an overflow port is formed between the first countercurrent rinsing tank and the second countercurrent rinsing tank, the overflow port is inclined, and one end of the overflow port, which is positioned on the second countercurrent rinsing tank, is higher than one end of the overflow port, which is positioned on the first countercurrent rinsing tank.
And further: the horizontal position of one end of the overflow pipe connected to the first countercurrent rinsing groove is lower than the position of one end of the overflow port on the first countercurrent rinsing groove.
And further: the spray groove, the spray nozzle, the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline are all made of polyvinyl chloride plastics or polypropylene plastics.
And further: the water inlet pipe, the three-way valve, the first counter-current rinsing tank and the second counter-current rinsing tank are all made of polyvinyl chloride plastics, polypropylene plastics or plating bath materials.
The invention also provides a wastewater treatment method adopting the treatment device for fully recycling the electroplating rinse water, which is characterized by comprising the following steps: the method comprises the following steps:
s1: recovering the spraying liquid: when the plating piece enters the spraying tank from the plating tank for spraying, the overflowing or redundant spraying liquid in the spraying tank is recovered through the spraying recovery tank;
s2: controlling temperature and recycling: the temperature control device arranged in the spray recovery tank is used for controlling the temperature of the recovered spray liquid, then the first water pump is started to re-convey the spray liquid with the controlled temperature into the spray tank for continuous spraying, and the spray liquid with the controlled temperature is used for continuously controlling the temperature of the spray liquid in the spray tank, so that unnecessary evaporation waste is reduced;
s3: and (3) recovery of rinsing water: when the plating piece enters the countercurrent rinsing tank from the spraying tank for rinsing, the rinsing water flowing out of the countercurrent rinsing tank is recovered through the overflow recovery tank;
s4: and (3) recovering rinsing water for treatment: the reclaimed rinsing water is pumped into the membrane concentration device by starting the second water pump, the fresh water treated by the membrane concentration device is sent into the high-level pure water tank, then flows into the countercurrent rinsing tank through the water inlet pipe for continuous use, and the concentrated water is sent into the concentrated water tank and then is conveyed into the spray recovery tank by starting the third water pump to be mixed with the reclaimed spray liquid for continuous use.
The invention has the advantages that the structure is simple, only a circulating spray concentration system device and a countercurrent rinsing concentration system device are needed, the principle is similar to intermittent countercurrent rinsing, the concentration of the plating solution is accelerated by controlling the spray water quantity of a spray tank, the concentration is faster as the water quantity is smaller but the minimum water quantity requirement of the system for realizing the circulating spray is met, in addition, a temperature control device in the spray recovery tank can control the evaporation concentration speed of the circulating spray solution in the spray recovery tank by controlling the temperature, meanwhile, the plating solution concentration at the rightmost end of a second-stage rinsing tank can meet the requirement of electroplating rinsing, namely the concentration does not exceed 20 mg/L, when the concentration of the spray recovery tank reaches the corresponding requirement, the tank is reversed, the second-stage rinsing tank is supplemented with a proper amount of rinsing water to continue rinsing, the whole process realizes the full recycling and zero discharge of electroplating water, in the process of realizing the operation of the full recycling device of electroplating wastewater by the circulating spray concentration method, the full recycling of the electroplating wastewater is recycled back into the plating tank, all the rinsing water brought out of the plating tank is recycled, all the rinsing water enters the plating tank, no wastewater is generated, only a small amount of the electroplating wastewater evaporated and only a small amount of the rinsing water is evaporated and only lost, the rinsing water is generated by the electroplating wastewater, and the electroplating wastewater is easily recycled from the electroplating process, and the electroplating wastewater can be used for the electroplating industry, and the electroplating process of electroplating wastewater, and the electroplating wastewater can be used for maintaining of electroplating industries, and the electroplating industry, and the electroplating process, and the electroplating wastewater can be used for maintaining of electroplating industry, and the.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of the present design.
Detailed Description
The treatment device for recycling the electroplating rinse water completely as shown in figure 1 comprises a spray concentration system device, a countercurrent rinse concentration system and a plating tank 1, wherein the spray concentration system device comprises a first water pump B1, a spray tank 2, a nozzle 3 and a spray recovery tank 5, the spray tank is communicated with the plating tank through a first pipeline, a three-way valve K1 is installed on the first pipeline, the nozzle is arranged in the spray tank, the spray recovery tank is arranged below the spray tank and is communicated with the bottom of the spray tank through a second pipeline, the spray recovery tank is also connected with a three-way valve K1 through a third pipeline, a first water pump is arranged on the third pipeline, and the countercurrent rinse concentration system comprises a countercurrent rinse tank, an overflow recovery tank 13, a membrane concentration device 14, a high-level pure water tank 11, a concentrated water tank 15, an overflow pipe 12, a reverse flow pipe 12 and a plating tank 1, The high-level pure water tank is communicated with the counter-flow rinsing tank through a water inlet pipe 10, a water outlet tap K2 is installed on the water inlet pipe, the counter-flow rinsing tank is communicated with the overflow recovery tank through an overflow pipe, the overflow recovery tank is communicated with the membrane concentration device through a fourth pipeline, the second water pump is installed on the fourth pipeline, the membrane concentration device is communicated with the high-level pure water tank through a fifth pipeline, the membrane concentration device is also communicated with the concentrated water tank through a sixth pipeline, the concentrated water tank is communicated with the spray recovery tank through a seventh pipeline, and the third water pump is installed on the seventh pipeline.
A U-shaped spray pipe is arranged in the spray tank shown in figure 1, and dry nozzles are respectively arranged on the inner walls of two parallel pipelines on the U-shaped spray pipe.
A temperature control device 6 is also arranged in the spraying recovery tank shown in fig. 1, the temperature control device is composed of an electric heating pipe and a temperature sensor, the electric heating pipe and the temperature sensor are respectively electrically connected with a controller, and the spraying tank and the spraying recovery tank are both internally provided with temperature sensors.
The countercurrent rinsing tank shown in fig. 1 is composed of a first countercurrent rinsing tank 7 and a second countercurrent rinsing tank 8, the second countercurrent rinsing tank is connected with a high-level pure water tank through a water inlet pipe, the first countercurrent rinsing tank is connected with an overflow recovery tank through an overflow pipe, an overflow port 9 is formed between the first countercurrent rinsing tank and the second countercurrent rinsing tank, the overflow port is inclined, and one end of the overflow port, which is positioned on the second countercurrent rinsing tank, is higher than one end of the overflow port, which is positioned on the first countercurrent rinsing tank.
The overflow pipe 12 shown in fig. 1 is connected to the first counter-current rinse tank at one end at a lower level than the overflow port at the first counter-current rinse tank.
The spray groove, the spray nozzles, the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline are all made of polyvinyl chloride plastics or polypropylene plastics.
The water inlet pipe, the three-way valve, the first counter-current rinsing tank 7 and the second counter-current rinsing tank 8 are all made of polyvinyl chloride plastics, polypropylene plastics or plating bath materials.
The invention also provides a wastewater treatment method adopting the treatment device for fully recycling the electroplating rinse water, which is characterized by comprising the following steps: the method comprises the following steps:
s1: recovering the spraying liquid: when the plating piece enters the spraying tank from the plating tank for spraying, the overflowing or redundant spraying liquid in the spraying tank is recovered through the spraying recovery tank;
s2: controlling temperature and recycling: the temperature control device arranged in the spray recovery tank is used for controlling the temperature of the recovered spray liquid, then the first water pump is started to re-convey the spray liquid with the controlled temperature into the spray tank for continuous spraying, and the spray liquid with the controlled temperature is used for continuously controlling the temperature of the spray liquid in the spray tank, so that unnecessary evaporation waste is reduced;
s3: and (3) recovery of rinsing water: when the plating piece enters the countercurrent rinsing tank from the spraying tank for rinsing, the rinsing water flowing out of the countercurrent rinsing tank is recovered through the overflow recovery tank;
s4: and (3) recovering rinsing water for treatment: the reclaimed rinsing water is pumped into the membrane concentration device by starting the second water pump, the fresh water treated by the membrane concentration device is sent into the high-level pure water tank, then flows into the countercurrent rinsing tank through the water inlet pipe for continuous use, the concentrated water is sent into the concentrated water tank for standby as spraying cleaning and supplementing water, and the concentrated water in the concentrated water tank is conveyed into the spraying recovery tank for spraying concentration again by starting the third water pump after the concentration of the spraying cleaning liquid reaches the plating solution concentration guide groove.
The plating part 4 is taken out from the plating bath 1 and put into the spray tank 2, the water pump B1 and the corresponding three-way valve K1 are opened (the pump is communicated with the spray tank and is not communicated with the plating bath), the spray liquid in the spray recovery tank 5 reaches the nozzle through the spray pipeline and is sprayed on the plating part, the spray liquid flows into the spray recovery tank 5 through the sewer pipe of the spray tank, the sprayed solution circularly flows into the spray tank for continuous spraying, the temperature of the rinsing liquid is controlled by the temperature control device 6 in the process, and different temperatures are controlled according to different conditions so as to control the evaporation and concentration speed of the rinsing liquid; and after controlling the spraying and cleaning in the spraying recovery tank 5 for a certain time (such as 30 seconds to 1 minute), stopping the pump, and finishing the spraying and rinsing. At the moment, the plated part is operated to a first-stage countercurrent rinsing tank 7 for countercurrent rinsing, the plated part 4 moves from left to right in the first-stage countercurrent rinsing tank, rinsing water flows out of a second-stage countercurrent rinsing tank from a water inlet pipe 10 from right to left, flows into the first-stage countercurrent rinsing tank through an overflow port 9, overflows from an overflow pipe 12 into an overflow recovery tank 13 when flowing to the leftmost end of the first-stage countercurrent rinsing tank, and the horizontal position of the overflow pipe 12 is lower than the overflow port 9 so as to ensure that the rinsing liquid in the first-stage countercurrent rinsing tank cannot diffuse into the second-stage rinsing tank; when the plated part 4 moves from left to right to the rightmost end in the first-stage countercurrent rinsing tank, the plated part 4 is lifted to stay above the first-stage countercurrent rinsing tank for a short time and then continuously enters the second-stage countercurrent rinsing tank to repeat the process of the plated part in the first-stage countercurrent rinsing tank, and when the plated part 4 moves from left to right to the rightmost end in the second-stage countercurrent rinsing tank, the plated part 4 is lifted, and rinsing is finished. The rinsing liquid overflowing from the overflow pipe 12 into the overflow recovery tank 13 is pumped into a membrane concentration device 14 by a pump, the fresh water treated by the membrane concentration device 14 is sent into a high-level pure water tank 11, and the concentrated water is sent into a concentrated water tank 15. The second batch of plated parts repeats the process of the first batch of plated parts, the concentration of the spray liquid in the spray recovery tank 5 after the second batch of plated parts are rinsed is higher than that after the first batch of plated parts are rinsed, the concentration of the spray liquid in the spray recovery tank 5 after the second batch of plated parts are rinsed is higher than that after the third batch of plated parts are rinsed, and the like, meanwhile, the water evaporation is carried out in the spray process, the speed of the water evaporation can be controlled by controlling the temperature, when the concentration of the spray liquid in the spray recovery tank 5 reaches the concentration of the plating liquid in the plating tank, the guide groove is started, namely, the water pump B1 and the corresponding three-way valve K1 (the pump is communicated with the plating tank and is not communicated with the spray tank) are started, the rinse liquid in the spray recovery tank 5 is guided into the plating tank, and then the concentrated solution in the concentrated water tank 15. The amount and concentration of the rinsing liquid needing membrane concentration treatment can be controlled by controlling the flow rate of the K2 water outlet faucet, when the concentrated water produced by the membrane concentration device treatment is the same as the amount of the rinsing liquid returned to the plating tank, the system reaches the balance, and the water evaporated in the process is supplemented into the high-level pure water tank 11 by pure water.
The left side of a three-way valve K1 in a spray tank pipe network can be communicated with a coating bath for pouring the coating bath, the rightmost side of a second-stage rinsing bath is provided with a water outlet tap K2 of a high-level pure water bath 11, new pure water can be used for replenishing rinsing water through K2, when the concentration of the rinsing water in the spray tank reaches the concentration of the pouring bath, the water outlet tap K1 and the three-way valve K1 are controlled to feed the rinsing water into the coating bath, so that the pouring bath is realized, meanwhile, the water outlet tap K2 of the rightmost side of the second-stage rinsing bath 11 is controlled to replenish the new rinsing water, in order to reach the cleaning standard, the maximum concentration of the plating solution at the rightmost end in the second-stage rinsing bath is controlled to be less than 20 mg/L, the concentration can be controlled by adjusting the flow of the water outlet tap K2 of the high-level pure water bath 11, the process can be repeated after the pouring bath is cleaned until the.
The principle of the invention is similar to intermittent countercurrent rinsing, the concentration of plating solution is accelerated by controlling the spraying water quantity of a spraying tank, the concentration is faster as the water quantity is smaller but the minimum water quantity requirement for realizing the circulation spraying of the system is required to be met, in addition, a temperature control device in the spraying recovery tank can control the evaporation concentration speed of the circulation spraying liquid in a spraying recovery tank 5 by controlling the temperature, meanwhile, the plating solution concentration at the rightmost end of a second-stage rinsing tank can meet the requirement of electroplating rinsing, namely the concentration does not exceed 20 mg/L, when the concentration of the spraying recovery tank reaches the corresponding requirement, the tank is reversed, the second-stage rinsing tank is supplemented with a proper amount of rinsing water to continue rinsing, the full recovery and zero discharge of electroplating rinsing water are realized in the whole process, in the process of realizing the operation of the full recovery and zero discharge of the electroplating wastewater by the circulation spraying method, the plating solution brought out from the plating tank is completely recovered and returned to the plating tank for reuse, all rinsing water is completely recycled into the plating tank without generating any waste water, only a small amount of water evaporated and water evaporated into the air, and the electroplating wastewater is easy to be recycled from the plating tank, and the electroplating industry, and the electroplating wastewater can be used for the electroplating industry, and the electroplating industry, the electroplating wastewater pollution of the electroplating industry, the electroplating process can be reduced by the electroplating wastewater can be used for the electroplating industry, and the electroplating wastewater, and the electroplating industry, and the electroplating wastewater can be used for the electroplating industry, and.
The following table shows the actual consumption of the zinc plating, silver plating, nickel plating and chromium plating production after the device and the method are adopted:
Claims (8)
1. the utility model provides a processing apparatus that electroplating rinsing water is complete recycle which characterized in that: including spraying concentrated system device, concentrated system of countercurrent rinsing and coating bath (1), concentrated system device of spraying include first water pump (B1), spray tank (2), nozzle (3) and spray accumulator (5), the spray tank be linked together through first pipeline and coating bath, first pipeline on install three through to valve (K1), the nozzle setting in spray tank, the accumulator setting that sprays communicate through the bottom of second pipeline and spray tank in spray tank's below, the accumulator that sprays still link to each other with three through third pipeline and three-way valve (K1), the third pipeline on be provided with first water pump, concentrated system of countercurrent rinsing by countercurrent rinsing groove, overflow accumulator (13), membrane enrichment facility (14), high-order pure water groove (11), concentrated water tank (15), overflow pipe (12), The membrane concentration device comprises a first water pump (A2) and a second water pump (B3), wherein the high-level pure water tank is communicated with a reverse flow rinsing tank through a water inlet pipe 10, a water outlet tap (K2) is installed on the water inlet pipe, the reverse flow rinsing tank is communicated with an overflow recovery tank through an overflow pipe, the overflow recovery tank is communicated with a membrane concentration device through a fourth pipeline, the first water pump is installed on the fourth pipeline, the membrane concentration device is communicated with the high-level pure water tank through a fifth pipeline, the membrane concentration device is further communicated with a concentrated water tank through a sixth pipeline, the concentrated water tank is communicated with a spray recovery tank through a seventh pipeline, and the third water pump is installed on the seventh pipeline.
2. The processing apparatus for recycling electroplating rinse water according to claim 1, wherein: the spraying groove is internally provided with a U-shaped spraying pipe, and the inner walls of two sections of parallel pipelines on the U-shaped spraying pipe are respectively provided with a plurality of nozzles.
3. The processing apparatus for recycling electroplating rinse water according to claim 1, wherein: still be provided with temperature regulating device (6) in the accumulator sprays, temperature regulating device constitute by electric heating pipe and temperature sensor, electric heating pipe and temperature sensor be connected with the controller electricity respectively, the accumulator spray and all be provided with temperature sensor in the accumulator sprays.
4. The processing apparatus for recycling electroplating rinse water according to claim 1, wherein: the countercurrent rinsing tank is composed of a first countercurrent rinsing tank (7) and a second countercurrent rinsing tank (8), the second countercurrent rinsing tank is connected with the high-level pure water tank through a water inlet pipe, the first countercurrent rinsing tank is connected with the overflow recovery tank through an overflow pipe, an overflow port (9) is formed between the first countercurrent rinsing tank and the second countercurrent rinsing tank, the overflow port is inclined, and one end of the overflow port, which is positioned on the second countercurrent rinsing tank, is higher than one end of the overflow port, which is positioned on the first countercurrent rinsing tank.
5. The processing apparatus for recycling electroplating rinse water according to claim 4, wherein: the horizontal position of one end of the overflow pipe (12) connected to the first countercurrent rinsing groove is lower than the position of one end of the overflow port on the first countercurrent rinsing groove.
6. The processing apparatus for recycling electroplating rinse water according to claim 1, wherein: the spray groove, the spray nozzle, the first pipeline, the second pipeline, the third pipeline, the fourth pipeline, the fifth pipeline, the sixth pipeline and the seventh pipeline are all made of polyvinyl chloride plastics or polypropylene plastics.
7. The processing device for fully recycling electroplating rinse water according to claim 1, characterized in that: the water inlet pipe, the three-way valve, the first counter-current rinsing tank (7) and the second counter-current rinsing tank (8) are all made of polyvinyl chloride plastics, polypropylene plastics or plating bath materials.
8. A wastewater treatment method adopting a treatment device for fully recycling electroplating rinse water is characterized by comprising the following steps: the method comprises the following steps:
s1: recovering the spraying liquid: when the plating piece enters the spraying tank from the plating tank for spraying, the overflowing or redundant spraying liquid in the spraying tank is recovered through the spraying recovery tank;
s2: controlling temperature and recycling: the temperature control device arranged in the spray recovery tank is used for controlling the temperature of the recovered spray liquid, then the first water pump is started to re-convey the spray liquid with the controlled temperature into the spray tank for continuous spraying, and the spray liquid with the controlled temperature is used for continuously controlling the temperature of the spray liquid in the spray tank, so that unnecessary evaporation waste is reduced;
s3: and (3) recovery of rinsing water: when the plating piece enters the countercurrent rinsing tank from the spraying tank for rinsing, the rinsing water flowing out of the countercurrent rinsing tank is recovered through the overflow recovery tank;
s4: and (3) recovering rinsing water for treatment: the reclaimed rinsing water is pumped into the membrane concentration device by starting the second water pump, the fresh water treated by the membrane concentration device is sent into the high-level pure water tank, then flows into the countercurrent rinsing tank through the water inlet pipe for continuous use, and the concentrated water is sent into the concentrated water tank and then is conveyed into the spray recovery tank by starting the third water pump to be mixed with the reclaimed spray liquid for continuous use.
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