CN111072179A - Chemical nickel plating waste water treatment method - Google Patents
Chemical nickel plating waste water treatment method Download PDFInfo
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- CN111072179A CN111072179A CN201911371779.7A CN201911371779A CN111072179A CN 111072179 A CN111072179 A CN 111072179A CN 201911371779 A CN201911371779 A CN 201911371779A CN 111072179 A CN111072179 A CN 111072179A
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- tank
- nickel plating
- chemical nickel
- flocculation
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- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 106
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 53
- 238000007747 plating Methods 0.000 title claims abstract description 40
- 239000000126 substance Substances 0.000 title claims abstract description 40
- 238000004065 wastewater treatment Methods 0.000 title claims description 15
- 238000005189 flocculation Methods 0.000 claims abstract description 36
- 230000016615 flocculation Effects 0.000 claims abstract description 36
- 239000002351 wastewater Substances 0.000 claims abstract description 34
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical compound [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 claims abstract description 32
- MHAJPDPJQMAIIY-UHFFFAOYSA-N hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 11
- 238000004062 sedimentation Methods 0.000 claims abstract description 10
- 238000005273 aeration Methods 0.000 claims abstract description 9
- 210000003462 Veins Anatomy 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 22
- OAICVXFJPJFONN-UHFFFAOYSA-N phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 21
- 229910052698 phosphorus Inorganic materials 0.000 claims description 21
- 239000011574 phosphorus Substances 0.000 claims description 21
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000002699 waste material Substances 0.000 claims description 17
- 239000006228 supernatant Substances 0.000 claims description 14
- 239000010802 sludge Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 9
- 238000001556 precipitation Methods 0.000 claims description 9
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 206010042602 Supraventricular extrasystoles Diseases 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- 238000000926 separation method Methods 0.000 claims description 6
- 238000009713 electroplating Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 5
- 230000020477 pH reduction Effects 0.000 abstract description 2
- ZGKNDXOLMOFEJH-UHFFFAOYSA-M Sodium hypophosphite Chemical compound [Na+].[O-]P=O ZGKNDXOLMOFEJH-UHFFFAOYSA-M 0.000 description 6
- 239000008139 complexing agent Substances 0.000 description 6
- 229910001379 sodium hypophosphite Inorganic materials 0.000 description 6
- 229910001453 nickel ion Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000001488 sodium phosphate Substances 0.000 description 3
- 229910000162 sodium phosphate Inorganic materials 0.000 description 3
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 3
- 241000276438 Gadus morhua Species 0.000 description 2
- 235000019516 cod Nutrition 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 239000004310 lactic acid Substances 0.000 description 2
- 235000014655 lactic acid Nutrition 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000003638 reducing agent Substances 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- FEWJPZIEWOKRBE-XIXRPRMCSA-N Mesotartaric acid Chemical compound OC(=O)[C@@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-XIXRPRMCSA-N 0.000 description 1
- QMMRZOWCJAIUJA-UHFFFAOYSA-L Nickel(II) chloride Chemical compound Cl[Ni]Cl QMMRZOWCJAIUJA-UHFFFAOYSA-L 0.000 description 1
- 235000015450 Tilia cordata Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- -1 accelerator Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- VHUUQVKOLVNVRT-UHFFFAOYSA-N ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 239000006172 buffering agent Substances 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 235000015165 citric acid Nutrition 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000006179 pH buffering agent Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000002639 sodium chloride Nutrition 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000001502 supplementation Effects 0.000 description 1
- 239000011975 tartaric acid Substances 0.000 description 1
- 229960001367 tartaric acid Drugs 0.000 description 1
- 235000002906 tartaric acid Nutrition 0.000 description 1
Classifications
-
- 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
- C02F1/20—Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
Abstract
The invention provides a method for treating chemical nickel plating wastewater. The chemical nickel plating wastewater adopts the processes of acidification, hydrogen peroxide solution vein breaking, dephosphorization reaction, primary flocculation and sedimentation, ammonia nitrogen removal reaction, aeration and secondary flocculation and sedimentation. The method solves the problems of poor treatment effect, inconvenient management, high treatment cost and the like of the existing method for treating the chemical nickel plating wastewater.
Description
Technical Field
The invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a chemical nickel plating wastewater treatment method.
Background
The chemical nickel plating process is a method which does not need to be electrified and utilizes a reducing agent sodium hypophosphite to reduce nickel ions into metal nickel in a solution containing the metal nickel ions according to the principle of redox reaction so as to deposit the metal nickel on the surfaces of various materials to form compact plating layers. The chemical nickel plating layer has the advantages of uniformity, high hardness, good chemical stability, simple chemical nickel plating process, high production efficiency, low cost and many excellent characteristics. The method is widely applied to the fields of aerospace, automobile industry, electronic computers, machinery, precision instrument manufacturing industry and the like.
In order to improve the stability of the plating solution, prolong the service life and ensure the quality of the plating layer, the plating solution needs to be added with auxiliary agents such as complexing agent, stabilizer, accelerator, buffering agent, brightener and the like. The chemical nickel plating solution mainly uses nickel chloride as main salt, citric acid, tartaric acid, lactic acid and the like as complexing agents, sodium hypophosphite as a reducing agent and ammonia water as a pH buffering agent, so that the problems of total nickel, total phosphorus, COD, ammonia nitrogen and the like can be involved in the wastewater treatment, and the treatment of the chemical nickel plating wastewater is difficult.
The treatment difficulty of the chemical nickel plating wastewater is mainly embodied in three layers: firstly, sodium hypophosphite in wastewater is inorganic phosphorus which is very difficult to remove, and is difficult to remove by precipitation through lime or a traditional phosphorus removing agent; secondly, nickel ions in the chemical nickel plating rinsing wastewater and complexing agents such as lactic acid can form complex nickel, and the complex nickel is difficult to precipitate and remove under the condition of adding alkali; thirdly, the concentration of total nickel, total phosphorus, COD and ammonia nitrogen in the waste bath solution generated during the bath replacement of the chemical nickel plating is very high, and the waste bath solution is difficult to treat by a common chemical method to reach the standard.
Therefore, the method has important significance for finding a mature, reliable, low-cost, low-energy-consumption, simple and feasible combined process for treating the chemical nickel plating wastewater, effectively treating the chemical nickel plating wastewater, and reducing the pollution to the environment and the damage to the ecology.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for treating chemical nickel plating wastewater.
The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
The invention adopts the following technical scheme:
in some optional embodiments, the chemical nickel plating wastewater treatment method comprises the following steps:
s1: breaking collaterals;
s2: removing phosphorus;
s3: primary flocculation;
s4: primary precipitation;
s5: removing ammonia nitrogen;
s6: secondary flocculation;
s7: secondary precipitation;
s8: discharging the supernatant separated in the step S7 into a comprehensive concentrated water tank, and adjusting the pH value back to 6-9;
the method for breaking the network in the step S1 includes: collecting the chemical nickel plating wastewater discharged by the electroplating line into a chemical nickel wastewater tank, pumping the chemical nickel plating wastewater into a decomplexing tank, adding sulfuric acid into the decomplexing tank, adjusting the pH value of the wastewater to 2.0-4.0, adding hydrogen peroxide, and stirring for reacting for 30-60 min.
Wherein the phosphorus removal method in the step S2 comprises the following steps: and conveying the waste liquid in the vein breaking tank to a phosphorus removal tank, adding a phosphorus removal agent to the phosphorus removal tank, and carrying out aeration stirring for 30-60 min.
Wherein, the primary flocculation method in the step S3 comprises the following steps: and conveying the waste liquid in the dephosphorization tank to a primary flocculation tank, and adding PAC, PAM and liquid caustic soda to the primary flocculation tank to perform primary flocculation reaction.
Wherein, the method of the primary precipitation in the step S4 is as follows: and (4) conveying the waste liquid in the primary flocculation tank to a primary sedimentation tank, standing and settling for sludge-water separation, discharging the sludge to a nickel sludge tank, and reserving the supernatant.
Wherein, the method for removing ammonia nitrogen in the step S5 comprises the following steps: pumping the supernatant separated in the step S4 to an ammonia nitrogen removal tank through a pump, adding an ammonia nitrogen remover, and carrying out aeration stirring for 1-2 hours;
wherein, the secondary flocculation method in the step S6 comprises the following steps: conveying the waste liquid in the ammonia nitrogen removal tank to a secondary flocculation tank, adding PAC, PAM and liquid caustic soda to the secondary flocculation tank for secondary flocculation reaction, and controlling the pH value to be 11;
wherein, the method of the secondary precipitation in the step S7 is as follows: and (4) conveying the waste liquid in the secondary flocculation tank to a secondary sedimentation tank, standing and settling for sludge-water separation, discharging the sludge to a nickel sludge tank, and reserving the supernatant.
The invention has the following beneficial effects:
1. converting sodium hypophosphite in the wastewater into sodium phosphate by a hydrogen peroxide oxidation method, and eliminating a complexing agent coated on the surface of the metal nickel ions;
2. the ammonia nitrogen removing process section adopts an ammonia nitrogen remover to oxidize ammonia nitrogen in the wastewater, simultaneously takes the volatility of the ammonia nitrogen into consideration, adopts aeration stirring to improve the ammonia nitrogen removing effect, and can reduce the ammonia nitrogen concentration of the wastewater to zero;
3. compared with the biochemical treatment process, the method reduces the step of supplementing the carbon source, and is more stable than the biochemical treatment process;
4. the system can be started and stopped in time according to the production running condition, and has the advantages of convenience in control and management and the like;
5. the treatment process of the invention ensures that the heavy metal ions, ammonia nitrogen and total phosphorus after the chemical nickel plating wastewater treatment reach the national standard, meets the emission requirement and has good popularization prospect.
Drawings
FIG. 1 is a process flow chart of the chemical nickel plating wastewater treatment method of the invention.
Detailed Description
The technical solution of the present patent will be further described in detail with reference to the following embodiments.
As shown in figure 1, the solid line in figure 1 is a waste water pipeline, and the dotted line is a sludge pipeline, the invention provides a method for treating chemical nickel plating waste water, which comprises the following steps:
s1: collecting the chemical nickel plating wastewater discharged by the electroplating line into a chemical nickel wastewater tank, pumping the chemical nickel plating wastewater into a decomplexing tank, adding sulfuric acid into the decomplexing tank, adjusting the pH value of the wastewater to 2.0-4.0, adding hydrogen peroxide, and stirring for reacting for 30-60 min.
In the step S1, sodium hypophosphite in the wastewater is mainly converted into sodium phosphate, and meanwhile, most of organic acid is oxidized, so that nickel complex in the wastewater is subjected to oxidation reaction, the complexing agent is damaged, and nickel ions are separated from the complexing agent to form an ionic state.
S2: and conveying the waste liquid in the vein breaking tank to a phosphorus removal tank, adding a phosphorus removal agent to the phosphorus removal tank, and aerating and stirring for 30-60min to ensure that the sodium phosphate and trace residual sodium hypophosphite completely react with the phosphorus removal agent.
S3: and conveying the waste liquid in the phosphorus removal tank to a primary flocculation tank, adding PAC, PAM and caustic soda liquid to the primary flocculation tank for primary flocculation reaction, and adjusting the pH value of the added caustic soda liquid in a readjusting way while taking the pH value of the subsequent ammonia nitrogen reaction into consideration.
S4: and (3) conveying the waste liquid in the primary flocculation tank to a primary sedimentation tank, standing and settling for sludge-water separation, discharging the sludge to a nickel sludge tank, and reserving the supernatant to enter a subsequent treatment flow.
S5: pumping the supernatant separated in the step S4 to an ammonia nitrogen removal tank through a pump, adding an ammonia nitrogen remover, and carrying out aeration stirring for 1-2 hours. The ammonia nitrogen removing process section adopts an ammonia nitrogen remover to oxidize ammonia nitrogen in the wastewater, simultaneously takes the volatility of the ammonia nitrogen into consideration, adopts aeration stirring to improve the ammonia nitrogen removing effect, and can reduce the ammonia nitrogen concentration of the wastewater to zero.
S6: and conveying the waste liquid in the ammonia nitrogen removal tank to a secondary flocculation tank, adding PAC, PAM and liquid caustic soda to the secondary flocculation tank for secondary flocculation reaction, and controlling the pH value to be 11.
S7: and (3) conveying the waste liquid in the secondary flocculation tank to a secondary sedimentation tank, standing and settling for sludge-water separation, discharging the sludge to a nickel sludge tank, and reserving supernatant, wherein the concentrations of pollutants such as total phosphorus, ammonia nitrogen, total nickel and the like in the waste water reach the discharge standard.
S8: and (4) discharging the supernatant separated in the step S7 into an integrated concentrated water tank, and adjusting the pH value back to 6-9, wherein the supernatant treated in the step S7 reaches the discharge standard, and the supernatant is adjusted back to 6-9 through the integrated concentrated water tank and can be directly discharged.
The invention adopts the processes of acidification, hydrogen peroxide solution vein breaking, dephosphorization reaction, primary flocculation and sedimentation, ammonia nitrogen removal reaction, aeration and secondary flocculation and sedimentation for the chemical nickel plating wastewater. The method solves the problems of poor treatment effect, inconvenient management, high treatment cost and the like of the existing method for treating the chemical nickel plating wastewater.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. The chemical nickel plating wastewater treatment method is characterized by comprising the following steps:
s1: breaking collaterals;
s2: removing phosphorus;
s3: primary flocculation;
s4: primary precipitation;
s5: removing ammonia nitrogen;
s6: secondary flocculation;
s7: secondary precipitation;
s8: discharging the supernatant separated in the step S7 into a comprehensive concentrated water tank, and adjusting the pH value back to 6-9;
the method for breaking the network in the step S1 includes: collecting the chemical nickel plating wastewater discharged by the electroplating line into a chemical nickel wastewater tank, pumping the chemical nickel plating wastewater into a decomplexing tank, adding sulfuric acid into the decomplexing tank, adjusting the pH value of the wastewater to 2.0-4.0, adding hydrogen peroxide, and stirring for reacting for 30-60 min.
2. The chemical nickel plating wastewater treatment method of claim 1, wherein the phosphorus removal method in the step S2 is as follows: and conveying the waste liquid in the vein breaking tank to a phosphorus removal tank, adding a phosphorus removal agent to the phosphorus removal tank, and carrying out aeration stirring for 30-60 min.
3. The chemical nickel plating wastewater treatment method of claim 2, wherein the primary flocculation method in the step S3 is as follows: and conveying the waste liquid in the dephosphorization tank to a primary flocculation tank, and adding PAC, PAM and liquid caustic soda to the primary flocculation tank to perform primary flocculation reaction.
4. The chemical nickel plating wastewater treatment method of claim 3, wherein the primary precipitation method in the step S4 is as follows: and (4) conveying the waste liquid in the primary flocculation tank to a primary sedimentation tank, standing and settling for sludge-water separation, discharging the sludge to a nickel sludge tank, and reserving the supernatant.
5. The chemical nickel plating wastewater treatment method of claim 4, wherein the method for removing ammonia nitrogen in the step S5 is as follows: pumping the supernatant separated in the step S4 to an ammonia nitrogen removal tank through a pump, adding an ammonia nitrogen remover, and carrying out aeration stirring for 1-2 hours.
6. The chemical nickel plating wastewater treatment method of claim 5, wherein the secondary flocculation method in the step S6 is as follows: and conveying the waste liquid in the ammonia nitrogen removal tank to a secondary flocculation tank, adding PAC, PAM and liquid caustic soda to the secondary flocculation tank for secondary flocculation reaction, and controlling the pH value to be 11.
7. An electroless nickel plating wastewater treatment method according to claim 6, wherein the secondary precipitation method in step S7 is: and (4) conveying the waste liquid in the secondary flocculation tank to a secondary sedimentation tank, standing and settling for sludge-water separation, discharging the sludge to a nickel sludge tank, and reserving the supernatant.
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| CN109205846A (en) * | 2018-10-19 | 2019-01-15 | 浙江海拓环境技术有限公司 | A kind of chemical nickel wastewater treatment method |
| CN109721187A (en) * | 2019-01-10 | 2019-05-07 | 陕西福天宝环保科技有限公司 | A kind of chemical nickel plating waste solution processing method |
| CN110395817A (en) * | 2019-07-25 | 2019-11-01 | 苏州湛清环保科技有限公司 | The recycling processing method of chemical nickel plating waste solution |
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