CN105967379A - Nickel-containing waste liquid treatment method - Google Patents
Nickel-containing waste liquid treatment method Download PDFInfo
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- CN105967379A CN105967379A CN201610279968.1A CN201610279968A CN105967379A CN 105967379 A CN105967379 A CN 105967379A CN 201610279968 A CN201610279968 A CN 201610279968A CN 105967379 A CN105967379 A CN 105967379A
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- Prior art keywords
- waste liquid
- processing method
- nickeliferous waste
- nickeliferous
- supernatant
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/52—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
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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
- C02F1/52—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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
-
- 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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a nickel-containing waste liquid treatment method. The method comprises the following steps: adding a reducing agent to a nickel-containing waste liquid under an acidic condition to carry out a reduction reaction, adding an alkali after the reduction reaction is completed in order to make the waste liquid be alkaline, standing the waste liquid to precipitate, taking the obtained supernatant, adding an oxidant to the supernatant to carry out an oxidation reaction, carrying out a full reaction, and adding a flocculating agent. The method has the advantages of effective nickel removal, realization of normal-temperature and normal-pressure operation, simple process, strong applicability, and stable industrial running effect.
Description
Technical field
The invention belongs to hazardous waste innoxious process for treating field, particularly relate to the processing method of a kind of nickeliferous waste liquid.
Background technology
Nickeliferous waste liquid is one of hazardous waste of electroplating industry generation, and the highest permission concentration of emission is 1mg/L, belongs to HW17 surface treatment waste in National Hazard refuse register.Other heavy metal elements in nickel and electroplating effluent thereof can cause human lesion the most carcinogenic.Nickel is primarily present in brain, bone marrow, the five internal organs after entering human body, causes the chronic disease of organ, and threat to life time serious, the compound of some nickel, such as hydroxyl nickel [Ni (CO)4] and nickel dirt be considered as carcinogen.Therefore, nickel is as first kind pollutant, and the injury of environment, human body be can not be ignored by it, and along with the continuous reinforcement of national environmental protection dynamics, the harmless treatment of the most nickelic electroplating effluent of electroplating effluent is extremely the most urgent.
The process of current nickeliferous waste liquid mainly uses chemical precipitation method, electrolysis, ion exchange, catalytic reduction method, electroosmose process, membrane permeation method, bioanalysis etc., great majority are two kinds or more of method integrated treatments, although some method treatment effect is preferable, but processing cost is higher, it is difficult to promote the use of.Because in Ni-Speed, need plating piece surface being carried out with diluted acid and clear water of variable interval, so the electroplating waste liquid containing nickle produced is acidity, and plating solution exists there is the hypophosphites of reproducibility, phosphite, citric acid and chelating agent and reducing agent in a large number, these organic and inorganic chelating agent form complex with the nickel ion in waste liquid, processing relatively difficult, single chemical precipitation method can not get good treatment effect.
Summary of the invention
It is an object of the invention to provide the processing method of a kind of nickeliferous waste liquid, the method can the most stably remove the nickel in waste liquid.
The technical scheme is that and be achieved in that: the processing method of a kind of nickeliferous waste liquid, comprise the following steps: in nickeliferous waste liquid, add reducing agent in acid condition carry out reduction reaction, after reduction reaction completes, adding alkali to waste liquid is alkalescence, stand, take supernatant after precipitation, in described supernatant, then add oxidant carry out oxidation reaction, fully add flocculant after reaction.
As preferably, the pH value of described acid condition is 1～4.
As preferably, described reducing agent is selected from ferrous sulfate；The addition of described reducing agent accounts for the 0.5%～2% of whole described nickeliferous waste liquid weight；The time of described reduction reaction is 30～60 minutes.
As preferably, described alkali is selected from the one in sodium hydroxide or Calx, or their arbitrary proportion mixture.
As preferably, the pH value of the waste liquid of described alkalescence is 9～10.
As preferably, time >=15 minute of described standing.
As preferably, described oxidant is sodium hypochlorite.
As preferably, the addition of described oxidant accounts for the 2%～6% of whole described supernatant weight；The time of described oxidation reaction is 15～30 minutes.
As preferably, described flocculant is anion-polyacrylamide solution.
As preferably, the addition of described flocculant accounts for the 0.01%～0.05% of whole described nickeliferous waste liquid weight.
The principle of the present invention is:
(1) ferrous sulfate is added under acid condition, on the one hand by Cr bigger for electroplating effluent toxic6+It is reduced into Cr3+, Fe simultaneously2+It is oxidized to Fe3+, Fe3+The colloidal particles catching in water by the hydroxide net hydrolyzed to form produce precipitation, it is achieved separate；On the other hand, the Ni2+ having neither part nor lot in the ferrous sulfate of reaction free with waste liquid reacts, and generates compound basic salt Ni Ni (OH)2·Fe(OH)3；
(2) during forming basic salt, heavy metal ion, by wrapping up, carrying effect secretly, is filled in lattice network and the slit of basic salt, when pH is 9～10, with OH—Combine closely and form stable solid solution；
(3) under the conditions of alkalescence, sodium hypochlorite has stronger oxidisability, destroys complexation nickel fractions in electroplating effluent, generates the metal ion of free state, utilizes precipitation principle, removes nickel and other heavy metal ion in specific hydroxide areas of sedimentation.
The beneficial effects of the present invention is:
(1) ensure that the heavy metal ion in other electroplating effluents reaches discharge standard while processing nickel；
(2) normal temperature and pressure operation, technique is simple, and the suitability is strong, and industrialization operational effect is stable；
(3) used by, medicament price is low, environment will not cause secondary pollution, and economic and social benefit is notable.
Detailed description of the invention
Below in conjunction with the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only one of them embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
Embodiment 1
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH=2.77, total Ni=1880mg/L, total Cu=128mg/L, total Cr=81mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 0.8% of waste liquid gross weight, stirring reaction 30min；Then the pH to 9.5 of feeding lime regulation waste liquid, stands 15min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 20min, and the anion-polyacrylamide solution adding 2 ‰ (wt%) by the 0.02% of electroplating effluent gross weight by the 5% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=0.736mg/L, total Cu=0.274mg/L, total Cr=1.22mg/L.
Embodiment 2
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH=1.38, total Ni=866mg/L, total Cu=306mg/L, total Cr=39mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 0.5% of waste liquid gross weight, stirring reaction 40min；Then the pH to 9 of feeding lime regulation waste liquid, stands 20min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 20min by the 3% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=0.233mg/L, total Cu=0.074mg/L, total Cr=0.518mg/L.
Embodiment 3
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH=3.15, total Ni=611mg/L, total Cu=41mg/L, total Cr=278mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 2% of waste liquid gross weight, stirring reaction 60min；Then the pH to 9.5 of feeding lime regulation waste liquid, stands 25min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 30min by the 2% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=0.091mg/L, total Cu=0.003mg/L, total Cr=0.935mg/L.
Embodiment 4
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH=3.66, total Ni=2850mg/L, total Cu=65mg/L, total Cr=8.45mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 1.5% of waste liquid gross weight, stirring reaction 45min；Then the pH to 10 of feeding lime regulation waste liquid, stands 30min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 20min, and the anion-polyacrylamide solution adding 2 ‰ (wt%) by the 0.05% of electroplating effluent gross weight by the 6% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=0.873mg/L, total Cu=0.488mg/L, total Cr=0.011mg/L.
Embodiment 5
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH=1.47, total Ni=177mg/L, total Cu=78.9mg/L, total Cr=11.6mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 0.5% of waste liquid gross weight, stirring reaction 30min；Then the pH to 9 of feeding lime regulation waste liquid, stands 15min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 30min by the 2.5% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=0.131mg/L, total Cu=0.007mg/L, total Cr=0.228mg/L.
Embodiment 6
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH < 1, total Ni=208mg/L, total Cu=61mg/L, total Cr=59mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 1.5% of waste liquid gross weight, stirring reaction 30min；Then the pH to 9.0 of feeding lime regulation waste liquid, stands 30min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 30min, and the anion-polyacrylamide solution adding 2 ‰ (wt%) by the 0.04% of electroplating effluent gross weight by the 6% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=8.68mg/L, total Cu=0.717mg/L, total Cr=5.39mg/L.
Embodiment 7
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH < 1, total Ni=208mg/L, total Cu=61mg/L, total Cr=59mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 2.0% of waste liquid gross weight, stirring reaction 30min；Then the pH to 11.0 of feeding lime regulation waste liquid, stands 30min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 30min, and the anion-polyacrylamide solution adding 2 ‰ (wt%) by the 0.05% of electroplating effluent gross weight by the 6% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=13.8mg/L, total Cu=7.11mg/L, total Cr=4.99mg/L.
Embodiment 8
With the electroplating effluent of certain Electroplate Factory for process object, former water constituent: pH=6.87, total Ni=488mg/L, total Cu=14.5mg/L, total Cr=25mg/L.
Utilize the method for the invention that this electroplating effluent is processed:
In electroplating effluent, add reducing agent ferrous sulfate, add by the 2.0% of waste liquid gross weight, stirring reaction 30min；Then the pH to 9.5 of feeding lime regulation waste liquid, stands 30min, and solid-liquid separation takes out supernatant；Adding sodium hypochlorite, stirring reaction 30min, and the anion-polyacrylamide solution adding 2 ‰ (wt%) by the 0.05% of electroplating effluent gross weight by the 6% of supernatant weight, stand, gained supernatant is process water outlet.
Water outlet is carried out water determination: always Ni=6.74mg/L, total Cu=1.45mg/L, total Cr=3.12mg/L.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included within the scope of the present invention.
Claims (10)
1. the processing method of a nickeliferous waste liquid, it is characterised in that: comprise the following steps: in acid condition
Adding reducing agent in nickeliferous waste liquid and carry out reduction reaction, after reduction reaction completes, adding alkali to waste liquid is alkali
Property, stand, after precipitation, take supernatant, then adding oxidant in described supernatant carries out oxidation reaction,
Fully add flocculant after reaction.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described acid
The pH value of property condition is 1～4.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described also
Former dose is selected from ferrous sulfate；The addition of described reducing agent account for whole described nickeliferous waste liquid weight 0.5%～
2%；The time of described reduction reaction is 30～60 minutes.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described alkali
One in sodium hydroxide or Calx, or their arbitrary proportion mixture.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described alkali
The pH value of the waste liquid of property is 9～10.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described quiet
Time >=15 minute put.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described oxygen
Agent is sodium hypochlorite.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described oxygen
The addition of agent accounts for the 2%～6% of whole described supernatant weight；The time of described oxidation reaction be 15～
30 minutes.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described wadding
Solidifying agent is anion-polyacrylamide solution.
The processing method of a kind of nickeliferous waste liquid the most according to claim 1, it is characterised in that: described
The addition of flocculant accounts for the 0.01%～0.05% of whole described nickeliferous waste liquid weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610279968.1A CN105967379A (en) | 2016-05-03 | 2016-05-03 | Nickel-containing waste liquid treatment method |
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| CN201610279968.1A CN105967379A (en) | 2016-05-03 | 2016-05-03 | Nickel-containing waste liquid treatment method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107500436A (en) * | 2017-07-26 | 2017-12-22 | 张家港市亚亨金属制品有限公司 | A kind of processing method of cupric, nickel ion waste plating solution |
| CN107986526A (en) * | 2017-11-30 | 2018-05-04 | 北京天维宝辰科贸有限公司 | The recovery and treatment method of copper ion in a kind of HEDP copper plating wastewaters |
| CN114956374A (en) * | 2022-05-12 | 2022-08-30 | 李正新 | Method for treating hypophosphorous acid in chemical nickel plating wastewater |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107500436A (en) * | 2017-07-26 | 2017-12-22 | 张家港市亚亨金属制品有限公司 | A kind of processing method of cupric, nickel ion waste plating solution |
| CN107986526A (en) * | 2017-11-30 | 2018-05-04 | 北京天维宝辰科贸有限公司 | The recovery and treatment method of copper ion in a kind of HEDP copper plating wastewaters |
| CN114956374A (en) * | 2022-05-12 | 2022-08-30 | 李正新 | Method for treating hypophosphorous acid in chemical nickel plating wastewater |
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