CN112979044A - Chemical nickel plating wastewater treatment and recovery unit - Google Patents
Chemical nickel plating wastewater treatment and recovery unit Download PDFInfo
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- CN112979044A CN112979044A CN202110250740.0A CN202110250740A CN112979044A CN 112979044 A CN112979044 A CN 112979044A CN 202110250740 A CN202110250740 A CN 202110250740A CN 112979044 A CN112979044 A CN 112979044A
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 145
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 72
- 238000007747 plating Methods 0.000 title claims abstract description 58
- 239000000126 substance Substances 0.000 title claims abstract description 57
- 238000011084 recovery Methods 0.000 title claims abstract description 19
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 18
- 239000002351 wastewater Substances 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 126
- 238000005192 partition Methods 0.000 claims description 7
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 6
- 229920003229 poly(methyl methacrylate) Polymers 0.000 claims description 6
- 239000004926 polymethyl methacrylate Substances 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 239000010936 titanium Substances 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- CJTCBBYSPFAVFL-UHFFFAOYSA-N iridium ruthenium Chemical compound [Ru].[Ir] CJTCBBYSPFAVFL-UHFFFAOYSA-N 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 238000009713 electroplating Methods 0.000 claims 1
- 239000000460 chlorine Substances 0.000 abstract description 15
- QWPPOHNGKGFGJK-UHFFFAOYSA-N hypochlorous acid Chemical compound ClO QWPPOHNGKGFGJK-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052801 chlorine Inorganic materials 0.000 abstract description 8
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 7
- 239000002699 waste material Substances 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 230000003647 oxidation Effects 0.000 abstract description 6
- 238000007254 oxidation reaction Methods 0.000 abstract description 6
- 238000006303 photolysis reaction Methods 0.000 abstract description 6
- 230000015843 photosynthesis, light reaction Effects 0.000 abstract description 6
- 230000003301 hydrolyzing effect Effects 0.000 abstract description 4
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 10
- WQYVRQLZKVEZGA-UHFFFAOYSA-N hypochlorite Chemical compound Cl[O-] WQYVRQLZKVEZGA-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- AEMRFAOFKBGASW-UHFFFAOYSA-N Glycolic acid Chemical compound OCC(O)=O AEMRFAOFKBGASW-UHFFFAOYSA-N 0.000 description 2
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000013522 chelant Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000008139 complexing agent Substances 0.000 description 2
- 230000005518 electrochemistry Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910001453 nickel ion Inorganic materials 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 description 1
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 1
- KDYFGRWQOYBRFD-UHFFFAOYSA-N Succinic acid Natural products OC(=O)CCC(O)=O KDYFGRWQOYBRFD-UHFFFAOYSA-N 0.000 description 1
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 1
- -1 accelerator Substances 0.000 description 1
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- KDYFGRWQOYBRFD-NUQCWPJISA-N butanedioic acid Chemical compound O[14C](=O)CC[14C](O)=O KDYFGRWQOYBRFD-NUQCWPJISA-N 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000315 carcinogenic Toxicity 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000007772 electroless plating Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 239000001630 malic acid Substances 0.000 description 1
- 235000011090 malic acid Nutrition 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 230000001235 sensitizing effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
-
- 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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
- C25C1/06—Electrolytic production, recovery or refining of metals by electrolysis of solutions or iron group metals, refractory metals or manganese
- C25C1/08—Electrolytic production, recovery or refining of metals by electrolysis of solutions or iron group metals, refractory metals or manganese of nickel or cobalt
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
- C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
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- 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
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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- Hydrology & Water Resources (AREA)
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Abstract
A chemical nickel plating wastewater treatment and recovery device relates to a chemical nickel plating wastewater treatment and recovery device. The invention aims to solve the technical problem that the complex compound heavy metal in the plating solution cannot be effectively removed by the existing heavy metal ion removal method. Chemical nickel plating waste waterAfter entering the electrolytic cell, Cl-in the wastewater is oxidized into Cl by anode when flowing through the anode plate2，Cl2Further hydrolyzing to HOCl/OCl‑，HOCl/OCl‑Under the irradiation of the ultraviolet lamp tube, hydroxyl radicals and active chlorine radicals can be generated, wherein anodic oxidation, ultraviolet photolysis, the hydroxyl radicals and the active chlorine radicals can break the complex, the complex breaking effect is greatly enhanced by the cooperation of the two, the nickel in the complex state is changed into nickel in a free state after being broken, and the free nickel is changed into a simple nickel substance under the reduction of the cathode plate 3, so that the recovery of the nickel in the chemical nickel plating wastewater can be completed.
Description
Technical Field
The invention relates to a chemical plating wastewater treatment and recovery device.
Background
Chemical plating, also called electroless plating, is a method which does not need to be electrified and utilizes a strong reducing agent in a solution of metal ions to reduce the metal ions into metal and deposit the metal ions on the surfaces of various materials to form a compact plating layer according to the principle of redox reaction. The nickel solution is a solution commonly used in chemical plating, and the chemical plating nickel has excellent comprehensive physical properties such as uniformity, hardness, wear resistance, corrosion resistance and the like, and the technology is widely applied. However, the chemical nickel plating waste liquid contains a large amount of metallic nickel which has carcinogenic and sensitizing effects and is an expensive noble metal, so that the chemical nickel plating waste liquid needs to be thoroughly treated and discharged.
In the chemical nickel plating process, in order to ensure the stability, service life and coating quality of the plating solution, a large amount of complexing agent, accelerator, stabilizer, brightener, pH value buffer agent and the like are added into the plating solution. In the chemical nickel plating solution, most of the complexing agents used are organic acids, such as citric acid, tartaric acid, malic acid, lactic acid, glycolic acid, succinic acid, acetic acid and the like. Excessive complex can react with heavy metal ions to generate stable chelate, and the traditional heavy metal ion removal method can not effectively remove the chelate, so that the heavy metal wastewater containing the complex becomes a difficult problem in chemical plating wastewater.
Therefore, how to further reduce the pollution of the chemical plating wastewater to the environment has become a great problem to be solved urgently in the field, and the development of the field is restricted to a certain extent.
Disclosure of Invention
The invention provides a device for treating and recovering chemical nickel plating wastewater, aiming at solving the technical problem that the complex compound heavy metal in plating solution cannot be effectively removed by the existing heavy metal ion removal method.
The chemical nickel plating wastewater treatment and recovery device consists of an electrolytic cell 1, an anode plate 2, a cathode plate 3, a water inlet pipe 4, a water outlet pipe 5, a clamping table 6, a circulating water pump 7, a partition plate 8, an upper cover 9 and an ultraviolet lamp tube 10;
the electrolytic cell 1 is a cuboid, the top of the electrolytic cell is of an open structure, and a circle of clamping table 6 is fixed at the upper part of the inner side wall of the electrolytic cell 1; a water inlet 1-1 is arranged at the lower part of one side wall of the electrolytic cell 1, a water outlet 1-2 is arranged at the upper part of the other side wall of the electrolytic cell 1, the water outlet 1-2 is lower than the clamping table 6, and the side wall where the water inlet 1-1 is positioned and the side wall where the water outlet 1-2 is positioned are oppositely arranged; the water outlet end of the water inlet pipe 4 is communicated with the water inlet 1-1, the water inlet end of the water inlet pipe 4 is communicated with the water outlet end of the circulating water pump 7, the water inlet end of the water outlet pipe 5 is communicated with the water outlet 1-2, and the water outlet end of the water outlet pipe 5 is communicated with the water inlet end of the circulating water pump 7;
a plurality of anode plates 2 and cathode plates 3 are fixed on the lower surface of the separator 8, the number of the anode plates 2 is equal to that of the cathode plates 3, the anode plates 2 and the cathode plates 3 are both vertically arranged and staggered, the anode plates 2 and the cathode plates 3 are arranged in parallel, and the structures and the sizes of the anode plates 2 and the cathode plates 3 are completely the same; the separator 8 is clamped on the clamping table 6, and the anode plate 2 and the cathode plate 3 are both positioned in the electrolytic cell 1; the clapboard 8 and the electrolytic cell 1 form a closed cavity; the electric wires connected with the anode plate 2 and the cathode plate 3 are arranged above the separator 8 through the separator 8; the side wall of the electrolytic cell 1 where the water inlet 1-1 is positioned is vertical to the cathode plate 3;
the upper cover 9 is a cuboid with an open bottom, two opposite side walls of the upper cover 9 are respectively provided with a through hole 9-1, and the ultraviolet lamp tube 10 passes through the two through holes 9-1 and is arranged in the inner cavity of the upper cover 9; one side wall of the upper cover 9 is provided with an electric threading hole 9-2; the upper cover 9 is arranged above the electrolytic cell 1, the side wall of the upper cover 9 where the through hole 9-1 is positioned is vertical to the side wall of the electrolytic cell 1 where the water inlet 1-1 is positioned, and electric wires connected with the anode plate 2 and the cathode plate 3 penetrate out of the electric wire through hole 9-2 to be connected with an external power supply.
The use method of the chemical nickel plating wastewater treatment and recovery device comprises the following steps:
connecting the chemical nickel plating wastewater to be treated to a water inlet of a circulating water pump 7, pressurizing the chemical nickel plating wastewater to be treated by the circulating water pump 7 to enable the chemical nickel plating wastewater to be treated to enter the electrolytic cell 1 from the water inlet 1-1, flow into a gap between the anode plate 2 and the cathode plate 3 towards a water outlet 1-2, finally flow out from a water outlet pipe 5, flow into the electrolytic cell 1 again from a water inlet pipe 4 through the circulating water pump 7, and performing the circulating operation until the nickel is completely reduced and then discharged through the water outlet 1-2.
The reaction principle of the device in the process of treating the chemical nickel plating wastewater is as follows:
after the chemical nickel plating wastewater enters the electrolytic cell 1 and flows through the anode plate 2, Cl-in the wastewater is anodized into Cl2，Cl2Further hydrolyzing to HOCl/OCl-，HOCl/OCl-Under the irradiation of the ultraviolet lamp tube 10, hydroxyl radicals and active chlorine radicals can be generated, wherein anodic oxidation, ultraviolet photolysis, the hydroxyl radicals and the active chlorine radicals can break the complex, the complex breaking effect is greatly enhanced through the joint coordination and the complex breaking, the nickel in the complex state is changed into nickel in the free state after being broken, the free nickel is changed into a simple nickel substance under the reduction of the cathode plate 3, and the recovery of the nickel in the chemical nickel plating wastewater can be completed.
The chemical nickel plating wastewater treatment and recovery device has the following beneficial effects:
1) the device integrates the electrochemistry and the photochemistry, so that the device treatment is integrated, the process is simple, and the occupied area and the process cost of a wastewater treatment facility are greatly reduced;
2) the device disclosed by the invention has the advantages that the degradation effect and the degradation rate are greatly improved through anodic oxidation, ultraviolet photolysis and complex breaking of a plurality of active groups;
3) the device of the invention electrochemically and hydrolytically reacts high-concentration Cl universally existing in the wastewater-The hypochlorous acid/hypochlorite is converted, and an oxidant, an acid-base agent and the like are not required to be added, so that the treatment process is simplified, and the cost is reduced;
4) the ultraviolet lamp tube 10 is arranged in the upper cover 9, and cannot contact with the wastewater in the electrolytic cell 1, so that the generation of dirt on the ultraviolet lamp tube 10 is avoided, and the influence on later-stage cleaning cost and luminous efficiency is reduced;
5) the device of the invention finally separates out the complex nickel in the wastewater in the form of simple substance on the cathode plate 3, is convenient for collection and recycling, avoids secondary pollution, completely conforms to the principle of changing waste into valuable and recycling waste, belongs to the environment-friendly process flow for treating the chemical plating wastewater containing nickel ions, conforms to the current strategic development requirements of China, and has great popularization and application values.
Drawings
FIG. 1 is a schematic external view of an electrolytic cell 1 and a top cover 9 combined together according to a first embodiment;
FIG. 2 is a schematic view of an electrolytic cell 1 according to a first embodiment;
FIG. 3 is a schematic top view of the electrolytic cell 1, the water inlet pipe 4, the water outlet pipe 5, and the circulating water pump 7 according to the first embodiment;
FIG. 4 is a schematic front view of the electrolytic cell 1 and the separator 8 in combination according to the first embodiment;
fig. 5 is a schematic front view of the combination of the upper cover 9 and the ultraviolet lamp 10 in the first embodiment.
Detailed Description
The first embodiment is as follows: the embodiment is a chemical nickel plating wastewater treatment and recovery device, as shown in fig. 1-5, which is specifically composed of an electrolytic cell 1, an anode plate 2, a cathode plate 3, a water inlet pipe 4, a water outlet pipe 5, a clamping table 6, a circulating water pump 7, a partition plate 8, an upper cover 9 and an ultraviolet lamp tube 10;
the electrolytic cell 1 is a cuboid, the top of the electrolytic cell is of an open structure, and a circle of clamping table 6 is fixed at the upper part of the inner side wall of the electrolytic cell 1; a water inlet 1-1 is arranged at the lower part of one side wall of the electrolytic cell 1, a water outlet 1-2 is arranged at the upper part of the other side wall of the electrolytic cell 1, the water outlet 1-2 is lower than the clamping table 6, and the side wall where the water inlet 1-1 is positioned and the side wall where the water outlet 1-2 is positioned are oppositely arranged; the water outlet end of the water inlet pipe 4 is communicated with the water inlet 1-1, the water inlet end of the water inlet pipe 4 is communicated with the water outlet end of the circulating water pump 7, the water inlet end of the water outlet pipe 5 is communicated with the water outlet 1-2, and the water outlet end of the water outlet pipe 5 is communicated with the water inlet end of the circulating water pump 7;
a plurality of anode plates 2 and cathode plates 3 are fixed on the lower surface of the separator 8, the number of the anode plates 2 is equal to that of the cathode plates 3, the anode plates 2 and the cathode plates 3 are both vertically arranged and staggered, the anode plates 2 and the cathode plates 3 are arranged in parallel, and the structures and the sizes of the anode plates 2 and the cathode plates 3 are completely the same; the separator 8 is clamped on the clamping table 6, and the anode plate 2 and the cathode plate 3 are both positioned in the electrolytic cell 1; the clapboard 8 and the electrolytic cell 1 form a closed cavity; the electric wires connected with the anode plate 2 and the cathode plate 3 are arranged above the separator 8 through the separator 8; the side wall of the electrolytic cell 1 where the water inlet 1-1 is positioned is vertical to the cathode plate 3;
the upper cover 9 is a cuboid with an open bottom, two opposite side walls of the upper cover 9 are respectively provided with a through hole 9-1, and the ultraviolet lamp tube 10 passes through the two through holes 9-1 and is arranged in the inner cavity of the upper cover 9; one side wall of the upper cover 9 is provided with an electric threading hole 9-2; the upper cover 9 is arranged above the electrolytic cell 1, the side wall of the upper cover 9 where the through hole 9-1 is positioned is vertical to the side wall of the electrolytic cell 1 where the water inlet 1-1 is positioned, and electric wires connected with the anode plate 2 and the cathode plate 3 penetrate out of the electric wire through hole 9-2 to be connected with an external power supply.
The using method of the chemical nickel plating wastewater treatment and recovery device of the embodiment is as follows:
connecting the chemical nickel plating wastewater to be treated to a water inlet of a circulating water pump 7, pressurizing the chemical nickel plating wastewater to be treated by the circulating water pump 7 to enable the chemical nickel plating wastewater to be treated to enter the electrolytic cell 1 from the water inlet 1-1, flow into a gap between the anode plate 2 and the cathode plate 3 towards a water outlet 1-2, finally flow out from a water outlet pipe 5, flow into the electrolytic cell 1 again from a water inlet pipe 4 through the circulating water pump 7, and performing the circulating operation until the nickel is completely reduced and then discharged through the water outlet 1-2.
The reaction principle of the device of the embodiment in the process of treating the chemical nickel plating wastewater is as follows:
after the chemical nickel plating wastewater enters the electrolytic cell 1 and flows through the anode plate 2, Cl-in the wastewater is anodized into Cl2，Cl2Further hydrolyzing to HOCl/OCl-，HOCl/OCl-Under the irradiation of the ultraviolet lamp tube 10, hydroxyl radicals and active chlorine radicals can be generated, wherein anodic oxidation, ultraviolet photolysis, the hydroxyl radicals and the active chlorine radicals can break the complex, the complex breaking effect is greatly enhanced through the joint coordination and the complex breaking, the nickel in the complex state is changed into nickel in the free state after being broken, the free nickel is changed into a simple nickel substance under the reduction of the cathode plate 3, and the recovery of the nickel in the chemical nickel plating wastewater can be completed.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is: the electrolytic cell 1 is made of acrylic glass. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the upper cover 9 is made of acrylic glass. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the difference between this embodiment mode and one of the first to third embodiment modes is: the partition plate 8 is made of quartz glass. The rest is the same as one of the first to third embodiments.
The fifth concrete implementation mode: the fourth difference between this embodiment and the specific embodiment is that: the anode plates 2 and the cathode plates 3 are arranged in a staggered mode according to a single-pole parallel connection mode. The rest is the same as the fourth embodiment.
The sixth specific implementation mode: the fifth embodiment is different from the fifth embodiment in that: the anode plate 2 is a titanium-based ruthenium iridium electrode. The rest is the same as the fifth embodiment.
The seventh embodiment: the sixth embodiment is different from the sixth embodiment in that: the cathode plate 3 is a pure titanium electrode. The rest is the same as the sixth embodiment.
The specific implementation mode is eight: the seventh embodiment is different from the seventh embodiment in that: the wavelength of the ultraviolet lamp tube 10 is 254 nm. The rest is the same as the seventh embodiment.
The invention was verified with the following tests:
test one: the test is a chemical nickel plating wastewater treatment and recovery device, as shown in figures 1-5, and specifically comprises an electrolytic cell 1, an anode plate 2, a cathode plate 3, a water inlet pipe 4, a water outlet pipe 5, a clamping table 6, a circulating water pump 7, a partition plate 8, an upper cover 9 and an ultraviolet lamp tube 10;
the electrolytic cell 1 is a cuboid, the top of the electrolytic cell is of an open structure, and a circle of clamping table 6 is fixed at the upper part of the inner side wall of the electrolytic cell 1; a water inlet 1-1 is arranged at the lower part of one side wall of the electrolytic cell 1, a water outlet 1-2 is arranged at the upper part of the other side wall of the electrolytic cell 1, the water outlet 1-2 is lower than the clamping table 6, and the side wall where the water inlet 1-1 is positioned and the side wall where the water outlet 1-2 is positioned are oppositely arranged; the water outlet end of the water inlet pipe 4 is communicated with the water inlet 1-1, the water inlet end of the water inlet pipe 4 is communicated with the water outlet end of the circulating water pump 7, the water inlet end of the water outlet pipe 5 is communicated with the water outlet 1-2, and the water outlet end of the water outlet pipe 5 is communicated with the water inlet end of the circulating water pump 7;
a plurality of anode plates 2 and cathode plates 3 are fixed on the lower surface of the separator 8, the number of the anode plates 2 is equal to that of the cathode plates 3, the anode plates 2 and the cathode plates 3 are both vertically arranged and staggered, the anode plates 2 and the cathode plates 3 are arranged in parallel, and the structures and the sizes of the anode plates 2 and the cathode plates 3 are completely the same; the separator 8 is clamped on the clamping table 6, and the anode plate 2 and the cathode plate 3 are both positioned in the electrolytic cell 1; the clapboard 8 and the electrolytic cell 1 form a closed cavity; the electric wires connected with the anode plate 2 and the cathode plate 3 are arranged above the separator 8 through the separator 8; the side wall of the electrolytic cell 1 where the water inlet 1-1 is positioned is vertical to the cathode plate 3;
the upper cover 9 is a cuboid with an open bottom, two opposite side walls of the upper cover 9 are respectively provided with a through hole 9-1, and the ultraviolet lamp tube 10 passes through the two through holes 9-1 and is arranged in the inner cavity of the upper cover 9; one side wall of the upper cover 9 is provided with an electric threading hole 9-2; the upper cover 9 is arranged above the electrolytic cell 1, the side wall of the upper cover 9 where the through hole 9-1 is positioned is vertical to the side wall of the electrolytic cell 1 where the water inlet 1-1 is positioned, and electric wires connected with the anode plate 2 and the cathode plate 3 penetrate out of the electric wire through hole 9-2 to be connected with an external power supply;
the electrolytic cell 1 is made of acrylic glass; the upper cover 9 is made of acrylic glass; the partition plate 8 is made of quartz glass; the anode plates 2 and the cathode plates 3 are arranged in a staggered mode according to a single-pole parallel connection mode; the anode plate 2 is a titanium-based ruthenium iridium electrode; the cathode plate 3 is a pure titanium electrode; the wavelength of the ultraviolet lamp tube 10 is 254 nm.
The use method of the chemical nickel plating wastewater treatment and recovery device in the test is as follows:
connecting the chemical nickel plating wastewater to be treated to a water inlet of a circulating water pump 7, pressurizing the chemical nickel plating wastewater to be treated by the circulating water pump 7 to enable the chemical nickel plating wastewater to be treated to enter the electrolytic cell 1 from the water inlet 1-1, flow into a gap between the anode plate 2 and the cathode plate 3 towards a water outlet 1-2, finally flow out from a water outlet pipe 5, flow into the electrolytic cell 1 again from a water inlet pipe 4 through the circulating water pump 7, and performing the circulating operation until the nickel is completely reduced and then discharged through the water outlet 1-2.
The reaction principle of the device in the process of treating the chemical nickel plating wastewater is as follows:
after the chemical nickel plating wastewater enters the electrolytic cell 1 and flows through the anode plate 2, Cl-in the wastewater is anodized into Cl2，Cl2Further hydrolyzing to HOCl/OCl-，HOCl/OCl-Under the irradiation of the ultraviolet lamp tube 10, hydroxyl radicals and active chlorine radicals can be generated, wherein anodic oxidation, ultraviolet photolysis, the hydroxyl radicals and the active chlorine radicals can break the complex, the complex breaking effect is greatly enhanced through the joint coordination and the complex breaking, the nickel in the complex state is changed into nickel in the free state after being broken, the free nickel is changed into a simple nickel substance under the reduction of the cathode plate 3, and the recovery of the nickel in the chemical nickel plating wastewater can be completed.
This experimental chemical nickel plating waste water treatment and recovery unit has following beneficial effect:
1) the test device integrates the electrochemical treatment and the photochemical treatment, has simple process, and greatly reduces the occupied area and the process cost of wastewater treatment facilities;
2) the test device greatly improves the degradation effect and rate by anodic oxidation, ultraviolet photolysis and complex breaking of various active groups;
3) the test device can be used for testing the ubiquitous high-concentration Cl in the wastewater through electrochemistry and hydrolysis-The hypochlorous acid/hypochlorite is converted, and an oxidant, an acid-base agent and the like are not required to be added, so that the treatment process is simplified, and the cost is reduced;
4) the ultraviolet lamp tube 10 is arranged in the upper cover 9 of the test device and cannot contact with the wastewater in the electrolytic cell 1, so that the generation of dirt on the ultraviolet lamp tube 10 is avoided, and the influence on later-stage cleaning cost and luminous efficiency is reduced;
5) the test device separates out the complex nickel in the wastewater in the cathode plate 3 in the form of simple substance, is convenient to collect and recycle, avoids secondary pollution, completely accords with the principle of changing waste into valuable and recycling waste, belongs to the environment-friendly process flow for treating the chemical plating wastewater containing nickel ions, accords with the current strategic development requirements of China, and has great popularization and application values.
The chemical nickel plating wastewater treatment is carried out by using the experimental device, the operation is carried out for 2h, and the data of the wastewater before and after the treatment are shown in the table 1:
TABLE 1
Claims (8)
1. A chemical nickel plating wastewater treatment and recovery device is characterized by consisting of an electrolytic cell (1), an anode plate (2), a cathode plate (3), a water inlet pipe (4), a water outlet pipe (5), a clamping table (6), a circulating water pump (7), a partition plate (8), an upper cover (9) and an ultraviolet lamp tube (10);
the electrolytic cell (1) is a cuboid, the top of the electrolytic cell is of an open structure, and a circle of clamping table (6) is fixed on the upper part of the inner side wall of the electrolytic cell (1); a water inlet (1-1) is arranged at the lower part of one side wall of the electrolytic cell (1), a water outlet (1-2) is arranged at the upper part of the other side wall of the electrolytic cell (1), the water outlet (1-2) is lower than the clamping table (6), and the side wall where the water inlet (1-1) is arranged is opposite to the side wall where the water outlet (1-2) is arranged; the water outlet end of the water inlet pipe (4) is communicated with the water inlet (1-1), the water inlet end of the water inlet pipe (4) is communicated with the water outlet end of the circulating water pump (7), the water inlet end of the water outlet pipe (5) is communicated with the water outlet (1-2), and the water outlet end of the water outlet pipe (5) is communicated with the water inlet end of the circulating water pump (7);
the lower surface of the separator (8) is fixed with a plurality of anode plates (2) and cathode plates (3), the number of the anode plates (2) is equal to that of the cathode plates (3), the anode plates (2) and the cathode plates (3) are both vertically arranged and are arranged in a staggered manner, the anode plates (2) and the cathode plates (3) are arranged in parallel, and the structures and the sizes of the anode plates (2) and the cathode plates (3) are completely the same; the separator (8) is clamped on the clamping table (6), and the anode plate (2) and the cathode plate (3) are both positioned in the electrolytic cell (1); the clapboard (8) and the electrolytic cell (1) form a closed cavity; the electric wires connected with the anode plate (2) and the cathode plate (3) penetrate through the separator (8) and are arranged above the separator (8); the side wall of the electrolytic cell 1 where the water inlet (1-1) is positioned is vertical to the cathode plate (3);
the upper cover (9) is a cuboid with an open bottom, two opposite side walls of the upper cover (9) are respectively provided with a through hole (9-1), and the ultraviolet lamp tube (10) penetrates through the two through holes (9-1) and is arranged in the inner cavity of the upper cover (9); one side wall of the upper cover (9) is provided with an electric threading hole (9-2); the upper cover (9) is arranged above the electrolytic cell (1), the side wall of the upper cover (9) where the through hole (9-1) is located is vertical to the side wall of the electrolytic cell (1) where the water inlet (1-1) is located, and electric wires connected with the anode plate (2) and the cathode plate (3) penetrate out of the electric wire connecting through hole (9-2) to be connected with an external power supply.
2. The device for treating and recycling chemical nickel plating wastewater as claimed in claim 1, characterized in that the material of the electrolytic cell (1) is acrylic glass.
3. The chemical nickel plating wastewater treatment and recovery device of claim 1, characterized in that the material of the upper cover (9) is acrylic glass.
4. An apparatus for treating and recycling nickel-plating waste water according to claim 1, characterized in that said partition plate (8) is made of quartz glass.
5. An apparatus for treating and recovering waste water from chemical nickel plating according to claim 1, characterized in that said anode plates (2) and cathode plates (3) are arranged in a staggered manner in a single-pole parallel connection.
6. The apparatus for treating and recovering waste water from electroless nickel plating process according to claim 1, characterized in that said anode plate (2) is a titanium-based ruthenium iridium electrode.
7. An apparatus for treating and recovering waste water from chemical nickel plating according to claim 1, characterized in that said cathode plate (3) is a pure titanium electrode.
8. An apparatus for treating and recycling nickel electroplating wastewater chemically according to claim 1, characterized in that the wavelength of said ultraviolet lamp tube (10) is 254 nm.
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