CN111847776A - Nickel-containing electroplating wastewater treatment device - Google Patents
Nickel-containing electroplating wastewater treatment device Download PDFInfo
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- CN111847776A CN111847776A CN202010667787.2A CN202010667787A CN111847776A CN 111847776 A CN111847776 A CN 111847776A CN 202010667787 A CN202010667787 A CN 202010667787A CN 111847776 A CN111847776 A CN 111847776A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 51
- 238000009713 electroplating Methods 0.000 title claims abstract description 33
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 51
- 238000001728 nano-filtration Methods 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 29
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 13
- 239000010802 sludge Substances 0.000 claims abstract description 8
- 238000001556 precipitation Methods 0.000 claims abstract description 7
- 239000002699 waste material Substances 0.000 claims abstract description 7
- 238000005265 energy consumption Methods 0.000 claims abstract description 6
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 4
- 230000000813 microbial effect Effects 0.000 claims abstract description 4
- 239000012528 membrane Substances 0.000 claims description 15
- 238000004519 manufacturing process Methods 0.000 claims description 11
- 230000009471 action Effects 0.000 claims description 6
- 238000011001 backwashing Methods 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000005842 biochemical reaction Methods 0.000 claims description 4
- 238000005273 aeration Methods 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 229910021645 metal ion Inorganic materials 0.000 claims description 3
- 239000002923 metal particle Substances 0.000 claims description 3
- 244000005700 microbiome Species 0.000 claims description 3
- 150000002894 organic compounds Chemical class 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000012855 volatile organic compound Substances 0.000 claims description 3
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 abstract description 7
- 230000008569 process Effects 0.000 abstract description 7
- 229910001453 nickel ion Inorganic materials 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract 1
- 229910001385 heavy metal Inorganic materials 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 239000002738 chelating agent Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009388 chemical precipitation Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 2
- 229910000359 iron(II) sulfate Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 239000008237 rinsing water Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910021586 Nickel(II) chloride Inorganic materials 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- -1 TA-Ni Chemical compound 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 235000003891 ferrous sulphate Nutrition 0.000 description 1
- 239000011790 ferrous sulphate Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000004060 metabolic process Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L nickel dichloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- LGQLOGILCSXPEA-UHFFFAOYSA-L nickel sulfate Chemical compound [Ni+2].[O-]S([O-])(=O)=O LGQLOGILCSXPEA-UHFFFAOYSA-L 0.000 description 1
- 229910000363 nickel(II) sulfate Inorganic materials 0.000 description 1
- 239000012716 precipitator Substances 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
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Classifications
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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
- 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
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- 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
- C02F2101/30—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
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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)
- Separation Using Semi-Permeable Membranes (AREA)
- Activated Sludge Processes (AREA)
Abstract
The invention discloses a nickel-containing electroplating wastewater treatment device, which comprises a wastewater pretreatment system, a first storage tank, a low-temperature vacuum concentration system, a security filter, a second storage tank, a nanofiltration device and an MBR device, and comprises the following steps: step S1 filtration, step S2 precipitation, step S3 separation by low temperature vacuum concentration system, step S4 temporary storage, step S5 nanofiltration, step S6 microbial decomposition. The system is simple to construct, the treatment device is basically divided into seven modules, the water quality of the nickel-containing electroplating wastewater sequentially treated by the seven modules meets the discharge standard, the facility layout is compact and reasonable, the occupied area is small, each process module is optimized to find the optimal operation condition, the treatment efficiency and the operation energy consumption are greatly improved, compared with the traditional treatment method, no sludge is generated, and nickel ions basically exist in the waste liquid discharged by the low-temperature vacuum concentration device and can be recycled.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a nickel-containing electroplating wastewater treatment device.
Background
At present, nickel-containing electroplating wastewater mainly comes from aqueduct waste liquid and aqueduct rinsing water in a nickel plating production process, the aqueduct rinsing water is a main source of the electroplating wastewater, free nickel mainly comprising nickel sulfate and nickel chloride is treated in the nickel plating wastewater, various complexing agents are required to be added according to a production process, and more stable acidic complex nickel such as TA-Ni, CA-Ni, SP-Ni and the like is formed with Ni2+ in the wastewater, so that the nickel-containing wastewater is difficult to effectively treat, although the nickel is one of trace elements necessary for organisms, the excessive nickel can block the growth and development of plants, influence the normal growth and metabolism of the plants and even cause the death of the plants, and meanwhile, the nickel can be accumulated in the plants, and when the plants with the content higher than the normal content enter a food chain, the health of animals and even human beings can be influenced. If the nickel-containing wastewater is discharged at will without being treated, water, soil and air are polluted, ecological balance is influenced, and the discharge area is changed into an ecological environment area with serious nickel pollution.
The treatment technology of the nickel-containing electroplating wastewater can divide the method for treating the nickel-containing electroplating wastewater into three major categories according to different principles: a chemical method, a physical-chemical method and a biological method are adopted to treat nickel-containing electroplating wastewater, wherein the chemical precipitation method mainly comprises a hydroxide precipitation method and a sulfide precipitation method, the traditional chemical precipitation method has the advantages of mature technology, less investment, low treatment cost and the like when being used for treating the nickel-containing electroplating wastewater, but a large amount of sludge can be generated in the reaction process and even secondary pollution is caused, the iron oxide method is that ferrous sulfate is added into the wastewater, FeSO4 can enable various heavy metal ions to form ferrite crystals to precipitate, the general formula of the iron body is FeO.Fe2O3, Ni2+ in the wastewater can occupy crystal lattices of Fe2+ to form coprecipitation and be removed, the ferrite method has the advantages of simple treatment equipment, less investment, recyclable sediment and the like when being used for treating the nickel-containing electroplating wastewater, but the discharge standard of 0.5mg/L cannot be achieved once, the high-efficiency heavy metal chelating precipitation method uses a novel precipitator, namely a heavy metal chelating agent, the heavy metal chelating agent has a good trapping effect on Ni2+, under a certain condition, the removal rate of the heavy metal chelating agent on Ni2+ in wastewater reaches more than 98.5%, but the treatment cost is higher by using the metal chelating agent, a large amount of sludge can be generated, the biological treatment method has a wide prospect, but the understanding of reaction kinetics between biological adsorption and heavy metal is not sufficient at present, a biological adsorbent with large adsorption capacity is to be developed, and the method has a certain distance from the wide industrial application.
In view of the above problems of various nickel-containing electroplating wastewater treatment processes, there is a need to develop a stable and effective process for deep removal of nickel.
Disclosure of Invention
The invention aims to provide a nickel-containing electroplating wastewater treatment device to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a nickel-containing electroplating wastewater treatment device, includes waste water pretreatment system, first storage tank, the concentrated system in low temperature vacuum, cartridge filter, second storage tank, receives and strains device and MBR device, includes following step:
step S1, filtering: pumping nickel-containing electroplating wastewater into a pretreatment system, wherein the pretreatment system is mainly a paper bag filter, and filtering out metal particles and macromolecular organic matters in the nickel-containing wastewater generated on a production line so as to reduce the load of subsequent equipment treatment;
step S2, precipitation: firstly, the nickel-containing wastewater passing through the pretreatment system enters a first storage tank for natural sedimentation;
step S3, separating by a low-temperature vacuum concentration system: pumping the supernatant settled in the first storage tank into a low-temperature vacuum concentration system, wherein under the condition of low-temperature vacuum, under the boiling condition of the nickel-containing wastewater, water vapor and volatile organic compounds enter a cartridge filter along with a pipeline to further improve the subsequent treatment water quality, and most of the residual metal ions and the nonvolatile organic compounds exist in the discharged concentrated solution;
Step S4, temporarily storing: the waste water passing through the security filter is temporarily stored in the second storage tank.
Step S5, nanofiltration: the second storage tank reaches a corresponding liquid level, under the control of the PLC, wastewater in the second storage tank enters the nanofiltration device, the nanofiltration device is automatically started, the wastewater is subjected to internal circulation in the nanofiltration device, the concentration ratio of the nanofiltration device is about 30%, water produced by the nanofiltration device directly enters the MBR device, concentrated solution produced by the nanofiltration device flows back to the first storage tank, and is subjected to primary low-temperature vacuum concentration and is discharged along with concentrated waste liquid;
step S6, microbial decomposition: the nanofiltration water is subjected to biochemical reaction in an MBR device, some organic matters are decomposed under the action of microorganisms, the water quality is further improved, and finally the effluent reaches the standard and is discharged.
Further, a liquid level meter is arranged in the first storage tank and connected with a PLC (programmable logic controller) to automatically control the on-off of the feeding pump;
furthermore, the operation pressure of the low-temperature vacuum concentration device is between 15KPa and 20KPa, the operation temperature is between 55 ℃ and 60 ℃, the generated steam is changed into high-temperature steam by a compressor, and the high-temperature steam is recycled, so that the energy consumption is greatly reduced;
furthermore, the paper bag filter used in the invention has the filtering precision of 5 μm, and the cartridge filter has the filtering precision of 1 μm;
Further, a liquid level meter is arranged in the second storage tank and connected with the PLC, and the opening and closing of the feeding pump are automatically controlled;
furthermore, electromagnetic valves are arranged on a water production pipe and a return pipe of the nanofiltration membrane device, the circulation time of the wastewater in the nanofiltration device is controlled, and the concentration ratio is controlled to be about 30 percent;
furthermore, the nanofiltration device is provided with an automatic backwashing device, and backwashing of the nanofiltration membrane is automatically carried out by comparing the water production flow;
further, carrying out aeration treatment on the wastewater in an aerobic tank of an MBR device, overflowing the wastewater after aerobic reaction to a membrane treatment tank, and intercepting sludge and part of macromolecular organic matters;
further, when the MBR device runs, in order to eliminate pollution, the logic of starting for 9 minutes and stopping for 1 minute is adopted;
further, in the MBR device produced water from inhaling pump inlet pipeline, installed the pressure gauge, know the degree of membrane pollution through the reading of pressure gauge, compare with initial pressure, the pressure differential reaches 2 meters water columns, washs the MBR membrane group.
Compared with the prior art, the invention has the beneficial effects that:
1. the system of the invention has simple construction, the treatment device is basically divided into seven modules, the water quality of the nickel-containing electroplating wastewater after being sequentially treated by the seven modules meets the discharge standard, the facility layout is compact and reasonable, and the occupied area is smaller.
2. The invention optimizes each process module, finds the optimal operation condition, and greatly improves the treatment efficiency and the operation energy consumption.
3. Compared with the traditional treatment method, the method does not generate sludge, and basically all nickel ions exist in the waste liquid discharged by the low-temperature vacuum concentration device, and can be recycled.
4. The invention has high automation degree, uses a large amount of PLC programs to control the automatic operation of the system, improves the automation operation degree and reduces the loss of manpower and material resources.
Drawings
FIG. 1 is a schematic flow chart of a nickel-containing electroplating wastewater treatment device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the present invention provides a technical solution: the utility model provides a nickel-containing electroplating wastewater treatment device, includes waste water pretreatment system, first storage tank, the concentrated system in low temperature vacuum, cartridge filter, second storage tank, receives and strains device and MBR device, includes following step:
Step S1, filtering: pumping nickel-containing electroplating wastewater into a pretreatment system, wherein the pretreatment system is mainly a paper bag filter, and filtering out metal particles and macromolecular organic matters in the nickel-containing wastewater generated on a production line so as to reduce the load of subsequent equipment treatment;
step S2, precipitation: firstly, the nickel-containing wastewater passing through the pretreatment system enters a first storage tank for natural sedimentation;
step S3, separating by a low-temperature vacuum concentration system: pumping the supernatant settled in the first storage tank into a low-temperature vacuum concentration system, wherein under the condition of low-temperature vacuum, under the boiling condition of the nickel-containing wastewater, water vapor and volatile organic compounds enter a cartridge filter along with a pipeline to further improve the subsequent treatment water quality, and most of the residual metal ions and the nonvolatile organic compounds exist in the discharged concentrated solution;
step S4, temporarily storing: the waste water passing through the security filter is temporarily stored in the second storage tank.
Step S5, nanofiltration: the second storage tank reaches a corresponding liquid level, under the control of the PLC, wastewater in the second storage tank enters the nanofiltration device, the nanofiltration device is automatically started, the wastewater is subjected to internal circulation in the nanofiltration device, the concentration ratio of the nanofiltration device is about 30%, water produced by the nanofiltration device directly enters the MBR device, concentrated solution produced by the nanofiltration device flows back to the first storage tank, and is subjected to primary low-temperature vacuum concentration and is discharged along with concentrated waste liquid;
Step S6, microbial decomposition: the nanofiltration water is subjected to biochemical reaction in an MBR device, some organic matters are decomposed under the action of microorganisms, the water quality is further improved, and finally the effluent reaches the standard and is discharged.
In the invention, a liquid level meter is arranged in a first storage tank, is connected with a PLC and automatically controls the start and stop of a feeding pump;
in the invention, the low-temperature vacuum concentration device has the operating pressure of between 15KPa and 20KPa and the operating temperature of between 55 ℃ and 60 ℃, and the generated steam is changed into high-temperature steam by the compressor for secondary utilization, thereby greatly reducing the energy consumption;
in the invention, the filtering precision of the paper bag filter is 5 μm, and the filtering precision of the cartridge filter is 1 μm;
in the invention, a liquid level meter is arranged in the second storage tank and connected with a PLC (programmable logic controller) to automatically control the on-off of the feeding pump;
in the invention, the water production pipe and the return pipe of the nanofiltration membrane device are provided with electromagnetic valves, the circulation time of the wastewater in the nanofiltration device is controlled, and the concentration ratio is controlled to be about 30 percent;
in the invention, the nanofiltration device is provided with an automatic backwashing device, and backwashing of the nanofiltration membrane is automatically carried out by comparing the water production flow;
according to the invention, the wastewater is subjected to aeration treatment in an aerobic tank of an MBR device, and the wastewater after aerobic reaction overflows to a membrane treatment tank to intercept sludge and part of macromolecular organic matters;
In the invention, when the MBR device runs, the logic of starting for 9 minutes and stopping for 1 minute is adopted for removing pollution;
in the invention, a pressure gauge is arranged in an inlet pipeline of the water-producing self-priming pump of the MBR device, the degree of membrane pollution is known through the reading of the pressure gauge, and compared with the initial pressure, the pressure difference reaches 2 meters of water column, so that the MBR membrane group is cleaned.
In the method, factors influencing the treatment effect mainly comprise the operation pressure and concentration ratio of a low-temperature vacuum concentration device, the concentration ratio of a nanofiltration device, the biochemical reaction time of an MBR device and the like, the method can achieve the discharge effect on the nickel-containing electroplating wastewater, the system construction is simple, the treatment device is basically divided into seven modules, the water quality of the nickel-containing electroplating wastewater sequentially treated by the seven modules meets the discharge standard, the facility layout is compact and reasonable, the occupied area is small, each process module is optimized, the optimal operation condition is found, the treatment efficiency and the operation energy consumption are greatly improved, compared with the traditional treatment method, sludge is not generated, nickel ions basically and completely exist in the waste liquid discharged by the low-temperature vacuum concentration device, the recovery treatment can be carried out, the automation degree is high, and the method utilizes a large number of PLC programs to control the automatic operation of the system, the automatic operation degree is improved, and the loss of manpower and material resources is reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. The utility model provides a nickeliferous electroplating effluent treatment plant, includes useless pretreatment of water system, first storage tank, the concentrated system in low temperature vacuum, cartridge filter, second storage tank, nanofiltration device and MBR device, its characterized in that: the method comprises the following steps:
Step S1, filtering: pumping nickel-containing electroplating wastewater into a pretreatment system, wherein the pretreatment system is mainly a paper bag filter, and filtering out metal particles and macromolecular organic matters in the nickel-containing wastewater generated on a production line so as to reduce the load of subsequent equipment treatment;
step S2, precipitation: firstly, the nickel-containing wastewater passing through the pretreatment system enters a first storage tank for natural sedimentation;
step S3, separating by a low-temperature vacuum concentration system: pumping the supernatant settled in the first storage tank into a low-temperature vacuum concentration system, wherein under the condition of low-temperature vacuum, under the boiling condition of the nickel-containing wastewater, water vapor and volatile organic compounds enter a cartridge filter along with a pipeline to further improve the subsequent treatment water quality, and most of the residual metal ions and the nonvolatile organic compounds exist in the discharged concentrated solution;
step S4, temporarily storing: the waste water passing through the security filter is temporarily stored in the second storage tank;
step S5, nanofiltration: the second storage tank reaches a corresponding liquid level, under the control of the PLC, wastewater in the second storage tank enters the nanofiltration device, the nanofiltration device is automatically started, the wastewater is subjected to internal circulation in the nanofiltration device, the concentration ratio of the nanofiltration device is about 30%, water produced by the nanofiltration device directly enters the MBR device, concentrated solution produced by the nanofiltration device flows back to the first storage tank, and is subjected to primary low-temperature vacuum concentration and is discharged along with concentrated waste liquid;
Step S6, microbial decomposition: the nanofiltration water is subjected to biochemical reaction in an MBR device, some organic matters are decomposed under the action of microorganisms, the water quality is further improved, and finally the effluent reaches the standard and is discharged.
2. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: a liquid level meter is arranged in the first storage tank, and is connected with a PLC (programmable logic controller) to automatically control the start and stop of the feeding pump.
3. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: the low-temperature vacuum concentration device has the operating pressure of between 15KPa and 20KPa and the operating temperature of between 55 ℃ and 60 ℃, and the generated steam is changed into high-temperature steam by a compressor for secondary utilization, so that the energy consumption is greatly reduced.
4. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: the paper bag filter used in the invention has the filtering precision of 5 mu m, and the cartridge filter has the filtering precision of 1 mu m.
5. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: and a liquid level meter is arranged in the second storage tank, is connected with a PLC and automatically controls the start and stop of the feeding pump.
6. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: the water production pipe and the return pipe of the nanofiltration membrane device are provided with electromagnetic valves to control the circulation time of the wastewater in the nanofiltration device, and the concentration ratio is controlled to be about 30 percent.
7. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: the nanofiltration device is provided with an automatic backwashing device, and backwashing of the nanofiltration membrane is automatically carried out by comparing the water production flow.
8. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: and (3) carrying out aeration treatment on the wastewater in an aerobic tank of the MBR device, and overflowing the wastewater subjected to aerobic reaction to a membrane treatment tank to intercept sludge and part of macromolecular organic matters.
9. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: when the MBR device is running, the logic of starting for 9 minutes and stopping for 1 minute is adopted to clear the pollution.
10. The nickel-containing electroplating wastewater treatment plant according to claim 1, characterized in that: in the MBR device produced water from inhaling pump inlet pipeline, installed the pressure gauge, know the degree of membrane pollution through the reading of pressure gauge, compare with initial pressure, the pressure differential reaches 2 meters water columns, washs the MBR membrane group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010667787.2A CN111847776A (en) | 2020-07-13 | 2020-07-13 | Nickel-containing electroplating wastewater treatment device |
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| CN113289358A (en) * | 2021-06-24 | 2021-08-24 | 常州思特恩节能科技有限公司 | Low-temperature evaporator and control system thereof |
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