CN114230053A - Treatment method and treatment system for nickel-containing waste liquid - Google Patents
Treatment method and treatment system for nickel-containing waste liquid Download PDFInfo
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- CN114230053A CN114230053A CN202111293390.2A CN202111293390A CN114230053A CN 114230053 A CN114230053 A CN 114230053A CN 202111293390 A CN202111293390 A CN 202111293390A CN 114230053 A CN114230053 A CN 114230053A
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- containing waste
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 239000007788 liquid Substances 0.000 title claims abstract description 86
- 239000002699 waste material Substances 0.000 title claims abstract description 77
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005868 electrolysis reaction Methods 0.000 claims abstract description 56
- 230000003197 catalytic effect Effects 0.000 claims abstract description 49
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 42
- 239000011574 phosphorus Substances 0.000 claims abstract description 42
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 33
- 230000001590 oxidative effect Effects 0.000 claims abstract description 31
- 239000007800 oxidant agent Substances 0.000 claims abstract description 19
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000008394 flocculating agent Substances 0.000 claims abstract description 11
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 claims abstract description 10
- VEQPNABPJHWNSG-UHFFFAOYSA-N Nickel(2+) Chemical compound [Ni+2] VEQPNABPJHWNSG-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910001453 nickel ion Inorganic materials 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical group OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 24
- 238000006243 chemical reaction Methods 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 8
- 239000003002 pH adjusting agent Substances 0.000 claims description 8
- YADSGOSSYOOKMP-UHFFFAOYSA-N dioxolead Chemical compound O=[Pb]=O YADSGOSSYOOKMP-UHFFFAOYSA-N 0.000 claims description 6
- 238000004064 recycling Methods 0.000 claims description 6
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001110 calcium chloride Substances 0.000 claims description 4
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 4
- 239000000920 calcium hydroxide Substances 0.000 claims description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 4
- 239000000347 magnesium hydroxide Substances 0.000 claims description 4
- 229910001862 magnesium hydroxide Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- DPLVEEXVKBWGHE-UHFFFAOYSA-N potassium sulfide Chemical compound [S-2].[K+].[K+] DPLVEEXVKBWGHE-UHFFFAOYSA-N 0.000 claims description 4
- 229910052979 sodium sulfide Inorganic materials 0.000 claims description 4
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 238000010979 pH adjustment Methods 0.000 claims 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 14
- 238000001556 precipitation Methods 0.000 abstract description 13
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 abstract description 4
- 235000011007 phosphoric acid Nutrition 0.000 abstract description 2
- 229910001385 heavy metal Inorganic materials 0.000 abstract 1
- 239000000706 filtrate Substances 0.000 description 6
- 239000000203 mixture Substances 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- 238000009388 chemical precipitation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 229910001376 inorganic hypophosphite Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- OFNHPGDEEMZPFG-UHFFFAOYSA-N phosphanylidynenickel Chemical compound [P].[Ni] OFNHPGDEEMZPFG-UHFFFAOYSA-N 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-M phosphinate Chemical compound [O-][PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-M 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007086 side reaction Methods 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
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
-
- 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
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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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved 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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
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- 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
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- 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
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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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
- C02F2101/105—Phosphorus compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/20—Heavy metals or heavy metal compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention relates to a treatment method of nickel-containing waste liquid, which comprises the following steps: 1) collecting the nickel-containing waste liquid into a waste liquid tank; 2) adjusting the pH value of the waste liquid; 3) catalyzing electrolysis reaction; 4) introducing the waste liquid after the catalytic electrolysis reaction into a water outlet tank, adding a second pH regulator to regulate the pH to 9-10, sequentially adding an oxidant, a phosphorus removing agent, a nickel removing agent and a flocculating agent, and stirring for 30-120min to remove the positive phosphorus in a precipitation form. The invention adopts a catalytic electrolysis method to treat the nickel-containing waste liquid, and effectively reduces the content of nickel ions in the waste liquid by combining with the added nickel removing agent; the method has the advantages of oxidizing organic matters in the wastewater, realizing deep COD treatment of the wastewater, completely oxidizing and converting hypophosphorous acid and phosphorous into orthophosphoric acid, removing the phosphorous after oxidation in a precipitation mode, effectively removing the hypophosphorous acid, the phosphorous and heavy metal nickel, along with simple and convenient treatment operation, high efficiency and low cost, and realizing standard discharge.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a treatment method and a treatment system for nickel-containing waste liquid.
Background
With the appearance of more and more electronic products, the development of the circuit board industry is more and more rapid, so that more and more nickel-containing wastewater is generated in the industry, and the treatment of the nickel-containing wastewater becomes one of the current research hotspots for solving or reducing the environmental pollution.
The nickel-containing wastewater contains a large amount of pollution factors such as nickel, phosphorus, chemical oxygen demand, ammonia nitrogen and the like, and if the treated wastewater does not reach the discharge standard or is discharged into the environment without treatment, the wastewater not only pollutes the environment and causes harm to human beings and other organisms, but also causes waste of resources. Therefore, the development of the treatment technology of the nickel-containing wastewater has very important significance for protecting the environment and improving the resource utilization rate.
The prior nickel-containing wastewater treatment method mainly comprises a chemical precipitation method and an electrolysis method. The chemical method mainly recovers nickel-phosphorus sludge, has low recycling efficiency, causes secondary pollution to the environment and is gradually reduced in use. The electrolytic method is concerned about because of its low pollution, recovery of metals in simple substance form, and high recovery purity of metals. However, the existing electroplating wastewater dephosphorization technology mainly adopts a chemical precipitation method, but phosphorus in the chemical nickel plating wastewater exists in the form of low-price inorganic phosphorus, hypophosphite and phosphite have high solubility, and are difficult to form precipitates, so that the inorganic hypophosphite and the phosphorus cannot be thoroughly removed.
Therefore, the prior art has a larger improvement space.
Disclosure of Invention
The invention aims to make up for the defects of the prior art and provides a treatment method and a treatment system for nickel-containing waste liquid.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a treatment method of nickel-containing waste liquid comprises the following steps:
1) collecting the nickel-containing waste liquid into a waste liquid tank;
2) adjusting the pH value of the waste liquid: introducing the nickel-containing waste liquid into a pH adjusting tank, adding a first pH adjusting agent to adjust the pH to 7-9 to obtain an adjusting liquid;
3) catalytic electrolysis reaction: introducing the regulating solution obtained in the step 2) into a catalytic electrolysis reactor, and adding a main oxidant to perform catalytic electrolysis reaction; reducing nickel ions into metal simple substances for recycling, and oxidizing organic matters in the waste liquid and oxidizing hypophosphorous acid and phosphorous into phosphorus;
4) introducing the waste liquid after the catalytic electrolysis reaction into a water outlet tank, and adding a second pH regulator to regulate the pH to 9-10;
5) introducing the clear liquid obtained after precipitation in the step 4) into a dephosphorization reaction tank, sequentially adding an oxidant, a dephosphorization agent, a nickel removal agent and a flocculating agent, and stirring for 30-120 min.
According to the scheme, the main oxidant is hydrogen peroxide.
The catalytic electrolysis reaction takes hydrogen peroxide as a main oxidant, electrons given out by the cathode of the catalytic electrolysis reactor are used as a catalyst, the hydrogen peroxide is dissociated into hydroxyl radicals, and the hydroxyl radicals have strong oxidizability, so that organic matters in the wastewater are oxidized, and the deep COD treatment of the wastewater is realized; moreover, nickel can be recovered in the form of metal simple substance, and hypophosphorous acid and phosphorous oxide can be converted into orthophosphoric acid. The pH is adjusted to 9-10 by adding a second pH adjusting agent so that the phosphorus is removed in the form of precipitate.
According to the scheme, the first pH regulator is one or more of sodium hydroxide and ammonia water. The pH value of the nickel-containing waste liquid is adjusted to facilitate the electrolytic reaction, and the hydrogen evolution side reaction is reduced, so that the electrolytic efficiency is improved.
According to the scheme, the temperature of the catalytic electrolysis reactor is 30-60 ℃, the electrolysis time is 30-180min, and the current isDensity of 200-400A/m2。
According to the above scheme, the second pH regulator is one or more of calcium hydroxide and magnesium hydroxide.
According to the scheme, the oxidant is hydrogen peroxide; the phosphorus removing agent is one or more of calcium chloride and magnesium chloride; the nickel removing agent is one or more of sodium sulfide and potassium sulfide; the flocculant is polyacrylamide.
According to the scheme, the time interval between the addition of the phosphorus removing agent and the nickel removing agent and the flocculating agent is 20-40 min.
A nickel-containing waste liquid treatment system comprises a waste liquid tank, a pH adjusting tank, a catalytic electrolysis reactor, a water outlet tank, an oxidation and phosphorus removal reaction tank and a filter press; the water outlet of the waste liquid tank is connected with the water inlet of the pH adjusting tank, the water outlet of the pH adjusting tank is connected with the water inlet of the catalytic electrolysis reactor, the water outlet of the catalytic electrolysis reactor is connected with the water inlet of the water outlet tank, the water outlet tank is connected with the phosphorus removal reaction tank, and the phosphorus removal reaction tank is connected with the filter press.
According to the scheme, lifting pumps are arranged between the waste liquid tank and the pH adjusting tank, between the pH adjusting tank and the catalytic electrolysis reactor, between the catalytic electrolysis reactor and the water outlet tank, and between the water outlet tank and the phosphorus removal reaction tank, and a mud pressing pump is arranged between the phosphorus removal reaction tank and the filter press.
According to the scheme, in the catalytic electrolysis reactor, the anode adopts a lead dioxide high oxygen evolution potential coating anode, and the cathode adopts foamed nickel with a three-dimensional network space structure.
The conventional chemical precipitation method cannot remove the phosphorous precipitation, and the phosphorous precipitation is removed through oxidation after the phosphorous is converted into the phosphorus, and then through metal salt precipitation.
The invention has the beneficial effects that:
according to the invention, the nickel-containing waste liquid is treated by adopting a catalytic electrolysis method, nickel ions can be recovered in a simple substance form, and the content of the nickel ions in the waste liquid is effectively reduced by combining with the added nickel removal agent; the method has the advantages that organic matters in the wastewater are oxidized, deep COD treatment of the wastewater is realized, the hypophosphorous acid and the phosphorous are completely oxidized and converted, the oxidized phosphorous can be removed in a precipitation mode, the treatment operation is simple and convenient, the efficiency is high, the cost is low, the inorganic hypophosphorous acid and the phosphorous are effectively removed, standard discharge is realized, and the technical problem of poor treatment effect in the prior art is effectively solved.
Drawings
FIG. 1 is a schematic structural diagram of a system for treating a nickel-containing waste liquid according to the present invention.
In the figure: 1. a waste liquid tank; 11. a lift pump; 2. a pH adjusting tank; 3. a catalytic electrolysis reactor; 4. a water outlet groove; 5. a dephosphorization reaction tank; 6. a filter press; 61. a mud pressing pump.
Detailed Description
In order to better understand the present invention, the following examples are further provided to illustrate the content of the present invention, but the present invention is not limited to the following examples.
Example 1
A treatment method of nickel-containing waste liquid comprises the following steps:
1) collecting the nickel-containing waste liquid into a waste liquid tank;
2) adjusting the pH value of the waste liquid: introducing the nickel-containing waste liquid into a pH adjusting tank, adding a first pH adjusting agent to adjust the pH to 7 to obtain an adjusting liquid;
3) catalytic electrolysis reaction: introducing the regulating solution obtained in the step 2) into a catalytic electrolysis reactor, and adding hydrogen peroxide as a main oxidant to perform catalytic electrolysis reaction; reducing nickel ions into metal simple substances for recycling, and oxidizing organic matters in the waste liquid and oxidizing hypophosphorous acid and phosphorous into phosphorus;
4) introducing the waste liquid after the catalytic electrolysis reaction into a water outlet tank, adding a second pH regulator to regulate the pH to 9, and removing the positive phosphorus in a precipitation form;
5) introducing the clear liquid obtained after precipitation in the step 4) into a dephosphorization reaction tank, sequentially adding an oxidant, a dephosphorization agent, a nickel removal agent and a flocculating agent, and stirring for 30 min.
And finally, carrying out filter pressing treatment on the treated waste liquid, and discharging the filtrate after the filtrate reaches the standard after detection.
Wherein the first pH regulator is sodium hydroxide; the temperature of the catalytic electrolysis reactor is 30 ℃, the electrolysis time is 30min, and the current density is 200A/m2(ii) a The second pH regulator is calcium hydroxide; the oxidant is hydrogen peroxide; the phosphorus removing agent is calcium chloride; the nickel removing agent is sodium sulfide; the flocculant is polyacrylamide.
Furthermore, the time interval between the addition of the phosphorus removing agent and the nickel removing agent and the flocculating agent is 20-40 min.
Example 2
A treatment method of nickel-containing waste liquid comprises the following steps:
1) collecting the nickel-containing waste liquid into a waste liquid tank;
2) adjusting the pH value of the waste liquid: introducing the nickel-containing waste liquid into a pH adjusting tank, adding a first pH adjusting agent to adjust the pH to 8 to obtain an adjusting liquid;
3) catalytic electrolysis reaction: introducing the regulating solution obtained in the step 2) into a catalytic electrolysis reactor, and adding hydrogen peroxide as a main oxidant to perform catalytic electrolysis reaction; reducing nickel ions into metal simple substances for recycling, and oxidizing organic matters in the waste liquid and oxidizing hypophosphorous acid and phosphorous into phosphorus;
4) introducing the waste liquid after the catalytic electrolysis reaction into a water outlet tank, adding a second pH regulator to regulate the pH to 9.5 so as to remove the positive phosphorus in a precipitation form;
5) introducing the clear liquid obtained after precipitation in the step 4) into a dephosphorization reaction tank, sequentially adding an oxidant, a dephosphorization agent, a nickel removal agent and a flocculating agent, and stirring for 70 min.
And finally, carrying out filter pressing treatment on the treated waste liquid, and discharging the filtrate after the filtrate reaches the standard after detection.
Wherein the first pH regulator is ammonia water; the temperature of the catalytic electrolysis reactor is 45 ℃, the electrolysis time is 100min, and the current density is 300A/m2(ii) a Second pH regulatorIs magnesium hydroxide; the oxidant is hydrogen peroxide; the phosphorus removing agent is magnesium chloride; the nickel removing agent is potassium sulfide; the flocculant is polyacrylamide.
Furthermore, the time interval between the addition of the phosphorus removing agent and the nickel removing agent and the flocculating agent is 30 min.
Example 3
A treatment method of nickel-containing waste liquid comprises the following steps:
1) collecting the nickel-containing waste liquid into a waste liquid tank;
2) adjusting the pH value of the waste liquid: introducing the nickel-containing waste liquid into a pH adjusting tank, adding a first pH adjusting agent to adjust the pH to 9 to obtain an adjusting liquid;
3) catalytic electrolysis reaction: introducing the regulating solution obtained in the step 2) into a catalytic electrolysis reactor, and adding hydrogen peroxide as a main oxidant to perform catalytic electrolysis reaction; reducing nickel ions into metal simple substances for recycling, and oxidizing organic matters in the waste liquid and oxidizing hypophosphorous acid and phosphorous into phosphorus;
4) introducing the waste liquid after the catalytic electrolysis reaction into a water outlet tank, adding a second pH regulator to regulate the pH to 10, and removing the positive phosphorus in a precipitation form;
5) introducing the clear liquid obtained after precipitation in the step 4) into a dephosphorization reaction tank, sequentially adding an oxidant, a dephosphorization agent, a nickel removal agent and a flocculating agent, and stirring for 120 min.
And finally, carrying out filter pressing treatment on the treated waste liquid, and discharging the filtrate after the filtrate reaches the standard after detection.
Wherein the first pH regulator is a mixture of sodium hydroxide and ammonia water; the temperature of the catalytic electrolysis reactor is 60 ℃, the electrolysis time is 180min, and the current density is 400A/m2(ii) a The second pH regulator is a mixture of calcium hydroxide and magnesium hydroxide; the oxidant is hydrogen peroxide; the phosphorus removing agent is a mixture of calcium chloride and magnesium chloride; the nickel removing agent is a mixture of sodium sulfide and potassium sulfide; the flocculant is polyacrylamide.
Furthermore, the time interval between the addition of the phosphorus removing agent and the nickel removing agent and the flocculating agent is 40 min.
Example 4
As shown in figure 1, a nickel-containing waste liquid treatment system comprises a waste liquid tank 1, a pH adjusting tank 2, a catalytic electrolysis reactor 3, a water outlet tank 4, an oxidation and phosphorus removal reaction tank 5 and a filter press 6; the water outlet of the waste liquid tank 1 is connected with the water inlet of the pH adjusting tank 2, the water outlet of the pH adjusting tank 2 is connected with the water inlet of the catalytic electrolysis reactor 3, the water outlet of the catalytic electrolysis reactor 3 is connected with the water inlet of the water outlet tank 4, the water outlet tank 4 is connected with the phosphorus removal reaction tank 5, and the phosphorus removal reaction tank 5 is connected with the filter press 6.
Furthermore, lift pumps are arranged between the waste liquid tank 1 and the pH adjusting tank 2, between the pH adjusting tank 2 and the catalytic electrolysis reactor 3, between the catalytic electrolysis reactor 3 and the water outlet tank 4, and between the water outlet tank 4 and the phosphorus removal reaction tank 5, and a sludge pressure pump is arranged between the phosphorus removal reaction tank 5 and the filter press 6.
In the catalytic electrolysis reactor 3, the anode is a lead dioxide high oxygen evolution potential coating anode, and the cathode is foamed nickel with a three-dimensional network space structure.
Comparative example 1
A method for treating a nickel-containing waste liquid, which is substantially the same as in example 3, except that steps 2 to 4 are eliminated.
The treatment effects of examples 1 to 3 and comparative example 1 were examined, and the examination data are shown in table 1 below:
from the above, the method for treating the nickel-containing waste liquid can effectively remove nickel ions and total phosphorus in the waste liquid, so that the treated effluent can reach the discharge standard.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (10)
1. A method for treating nickel-containing waste liquid is characterized by comprising the following steps:
1) collecting the nickel-containing waste liquid into a waste liquid tank;
2) adjusting the pH value of the waste liquid: introducing the nickel-containing waste liquid into a pH adjusting tank, adding a first pH adjusting agent to adjust the pH to 7-9 to obtain an adjusting liquid;
3) catalytic electrolysis reaction: introducing the regulating solution obtained in the step 2) into a catalytic electrolysis reactor, and adding a main oxidant to perform catalytic electrolysis reaction; reducing nickel ions into metal simple substances for recycling, and oxidizing organic matters in the waste liquid and oxidizing hypophosphorous acid and phosphorous into phosphorus;
4) introducing the waste liquid after the catalytic electrolysis reaction into a water outlet tank, and adding a second pH regulator to regulate the pH to 9-10;
5) introducing the clear liquid obtained in the step 4) into a dephosphorization reaction tank, sequentially adding an oxidant, a dephosphorization agent, a nickel removal agent and a flocculating agent, and stirring for 30-120 min.
2. The method for treating the nickel-containing waste liquid according to claim 1, wherein the main oxidant is hydrogen peroxide.
3. The method according to claim 1, wherein the first pH adjuster is one or more of sodium hydroxide and aqueous ammonia.
4. The method for treating nickel-containing waste liquid as claimed in claim 1, wherein the temperature of the catalytic electrolysis reaction is 30-60 ℃, the electrolysis time is 30-180min, and the current density is 200-400A/m2。
5. The method for treating nickel-containing waste liquid according to claim 1, wherein the second pH adjuster is one or more of calcium hydroxide and magnesium hydroxide.
6. The method for treating the nickel-containing waste liquid according to claim 1, wherein the oxidant is hydrogen peroxide; the phosphorus removing agent is one or more of calcium chloride and magnesium chloride; the nickel removing agent is one or more of sodium sulfide and potassium sulfide; the flocculant is polyacrylamide.
7. The method for treating nickel-containing waste liquid according to claim 1, wherein the time interval between the addition of the phosphorus and nickel removing agents and the flocculating agent is 20-40 min.
8. A nickel-containing waste liquid treatment system is characterized by comprising a waste liquid tank, a pH adjusting tank, a catalytic electrolysis reactor, a water outlet tank, an oxidation and phosphorus removal reaction tank and a filter press; the water outlet of the waste liquid tank is connected with the water inlet of the pH adjusting tank, the water outlet of the pH adjusting tank is connected with the water inlet of the catalytic electrolysis reactor, the water outlet of the catalytic electrolysis reactor is connected with the water inlet of the water outlet tank, the water outlet tank is connected with the phosphorus removal reaction tank, and the phosphorus removal reaction tank is connected with the filter press.
9. The nickel-containing waste liquid treatment system according to claim 8, wherein a lift pump is provided between the waste liquid tank and the pH adjustment tank, between the pH adjustment tank and the catalytic electrolysis reactor, between the catalytic electrolysis reactor and the water outlet tank, and between the water outlet tank and the phosphorus removal reaction tank, and a sludge pressure pump is provided between the phosphorus removal reaction tank and the filter press.
10. The nickel-containing waste liquid treatment system according to claim 8, wherein in the catalytic electrolysis reactor, the anode is a lead dioxide high oxygen evolution potential coating anode, and the cathode is foamed nickel with a three-dimensional network space structure.
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