CN107662984A - The processing method of chemical nickle-plating wastewater - Google Patents
The processing method of chemical nickle-plating wastewater Download PDFInfo
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- CN107662984A CN107662984A CN201610613342.XA CN201610613342A CN107662984A CN 107662984 A CN107662984 A CN 107662984A CN 201610613342 A CN201610613342 A CN 201610613342A CN 107662984 A CN107662984 A CN 107662984A
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- plating wastewater
- chemical nickle
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- plating
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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
- C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
-
- 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
- C02F1/70—Treatment of water, waste water, or sewage by reduction
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2201/00—Apparatus for treatment of water, waste water or sewage
- C02F2201/002—Construction details of the apparatus
- C02F2201/007—Modular design
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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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 provides a kind of processing method of chemical nickle-plating wastewater, comprise the following steps：Under conditions of pH value 79, the sodium dithionite that 1~9g/L is added in chemical nickle-plating wastewater carries out reduction reaction, reacts more than 10 minutes；The pH value of chemical nickle-plating wastewater is adjusted to more than 10；And 0.2~1g/L calcium salt is added in chemical nickle-plating wastewater, after reacting more than 10 minutes, add flocculant and carry out flocculation sediment.
Description
Technical field
The invention mainly relates to field of industrial waste water treatment, more particularly to a kind of processing method of chemical nickle-plating wastewater.
Background technology
Chemical nickel plating is to develop faster process for treating surface in recent years, and it is so that nickel salt and hypophosphites etc. act on and give birth to
Into nickel, a kind of coating method of phosphorus coating.Chemical nickel plating due to coating uniformly, be not required to that external power, hardness is high, anti-wear performance
The advantages that good, plating is not limited by part dimension shape and be widely used in every field.With chemical nickel plating application
Constantly expand with production scale, caused chemical nickel plating waste solution environmental pollution is also increasingly severe therewith.
At present, industrial chemistry nickel plating is carried out in sodium hypophosphite is the acidity or alkaline system of reducing agent, in order to protect
Stability, service life and the quality of coating of plating solution are demonstrate,proved, needs to add complexing agent, stabilizer, accelerator, pH value buffering in plating solution
Agent and nickel plating brightener etc..These materials are organic matter, such as citric acid, tartaric acid, malic acid, hydroxyacetic acid, succinic acid, amber
Amber acid, acetic acid etc..
Due in plating solution there is the substantial amounts of hypophosphites and phosphite and complexing agent and reducing agent with reproducibility,
Plating solution COD can be caused drastically to raise.In the plating solution, the accumulation of the sulfate and phosphite that are generated due to reaction simultaneously, easily
Make plating solution aging, chemical nickel-plating liquid may be caused partly or entirely to scrap.Therefore, polluted in the plating solution and plating piece washings scrapped
Material is more, it is necessary to is handled.
Because the composition of chemical plating fluid and waste water is complex, include inorganic salts, complex compound etc., therefore chemical nickel plating
The processing of waste water is relatively difficult.The complexing dosage especially added in chemical plating fluid is more, and these materials have stronger with nickel
Complexing, easily forms stable comple with nickel, and the processing to plating solution brings difficulty.The processing of waste liquid and waste water is mainly adopted at present
Handled with pretreatment (oxidation), the multi-grade chemical precipitation method, the combination of heavy metal chelating agent.This handling process is extremely
Cost that is complicated, disposing waste liquid is higher, and treatment effect is unstable.
The content of the invention
The technical problem to be solved in the present invention is to provide the processing method of chemical nickle-plating wastewater, has more simplified processing
Flow.
In order to solve the above technical problems, the invention provides a kind of processing method of chemical nickle-plating wastewater, including following step
Suddenly：Under conditions of pH value 7-9, the sodium dithionite that 1~9g/L is added in chemical nickle-plating wastewater carries out reduction reaction, instead
Answer more than 10 minutes；The pH value of chemical nickle-plating wastewater is adjusted to more than 10；And in chemical nickle-plating wastewater add 0.2~
1g/L calcium salt, after reacting more than 10 minutes, add flocculant and carry out flocculation sediment.
In one embodiment of this invention, the above method also includes adjusting the pH value of chemical nickle-plating wastewater to 7~9.
In one embodiment of this invention, after flocculation sediment is carried out, in addition to by chemical nickle-plating wastewater carry out ion friendship
Change, to ensure that the concentration of nickel is less than 0.1mg/L.
In one embodiment of this invention, the ion exchange uses chelating class ion exchange resin.
In one embodiment of this invention, the calcium salt is calcium chloride or calcium hydroxide.
In one embodiment of this invention, the flocculant is PAM.
Compared with prior art, the present invention utilizes the single reducing agent of sodium dithionite, makes to be complexed in chemical nickle-plating wastewater
State nickel separate out, so as to realize the efficient removal by a chemical precipitation, pH value of waste water is without repeatedly adjusting, sedimentation effect
It is good.The technological process of the present invention is simple, and operation is simple, and processing cost is low, and operation maintenance is convenient, and treatment effect is reliable and stable.
Brief description of the drawings
Fig. 1 is the process flow figure of the chemical nickle-plating wastewater of one embodiment of the invention.
Fig. 2 is the process flow figure of the chemical nickle-plating wastewater of one embodiment of the invention.
Fig. 3 is the processing equipment schematic diagram of the chemical nickle-plating wastewater of one embodiment of the invention.
Embodiment
For the above objects, features and advantages of the present invention can be become apparent, the tool below in conjunction with accompanying drawing to the present invention
Body embodiment elaborates.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with
It is different from other manner described here using other to implement, therefore the present invention is not limited by following public specific embodiment
System.
The present invention utilizes flocculation sediment processing of electronation after the water quality characteristicses of chemical nickle-plating wastewater are considered
Main process, removed most nickel in waste water.
Fig. 1 is the process flow figure of the chemical nickle-plating wastewater of one embodiment of the invention.With reference to shown in figure 1, this implementation
The method of example comprises the following steps：
In step 101, under conditions of pH value 7-9, the sodium dithionite that 1~9g/L is added in chemical nickle-plating wastewater enters
Row reduction reaction, react more than 10 minutes.
This course of reaction, the pH value of waste water can be made to fall 1~2 unit, and waste water blackening, appearance muddiness, this shows also
It is former complete.
In step 102, the pH value of chemical nickle-plating wastewater is adjusted to more than 10.
In step 103,0.2~1g/L calcium salt is added in chemical nickle-plating wastewater, after reacting more than 10 minutes, adds wadding
Solidifying agent carries out flocculation sediment.
In above-mentioned flow, the reduction reaction of step 101 can make the nickel separate out of complex state in chemical nickle-plating wastewater,
Make it possible that the chemical flocculation precipitation of step 103 removes most nickel.By contrast, it is conventional by nickel or other metals
The method of separate out mainly includes acidifying, displacement and oxidation from complex state.In addition, in the selection of reducing agent, the company of discovery
The effect of sodium sulfite is the most notable, and other reducing agents, such as sodium sulfite and vulcanized sodium, effect are poor, contact break
Effect is not notable.
The use of matching step 101 and 104, after step 103, it is ensured that the nickel concentration of water outlet is less than 0.3mg/L,
Even the nickel concentration of water outlet can be made to be less than 0.1mg/L in most cases.By contrast, the single chemistry through other method
Precipitation process, water outlet nickel can only handle 1mg/L or so.
In step 101, if the original pH of waste water is in 7-9 section, directly beginning reduction reaction.If waste water
Original pH in 7-9 section, does not then carry out the regulation of pH value first.
In step 103, the nickel in processing waste water can be cooperateed with using calcium salt, while coagulating sedimentation, calcium salt can be promoted
Can be calcium chloride or calcium hydroxide.In addition, there are various flocculants to select, such as PAM.
Fig. 2 is the process flow figure of the chemical nickle-plating wastewater of another embodiment of the present invention.With reference to shown in figure 2, this reality
The method for applying example comprises the following steps：
In step 201, under conditions of pH value 7-9,1~9g/L sodium dithionite is added in chemical nickle-plating wastewater
Reduction reaction is carried out, is reacted more than 10 minutes.
This course of reaction, the pH value of waste water can be made to fall 1~2 unit, and waste water blackening, appearance muddiness, this shows also
It is former complete.
In step 202, the pH value of chemical nickle-plating wastewater is adjusted to more than 10.
In step 203,0.2~1g/L calcium salt is added in chemical nickle-plating wastewater, after reacting more than 10 minutes, adds wadding
Solidifying agent carries out flocculation sediment.
In step 204, chemical nickle-plating wastewater is subjected to ion exchange, to ensure that the concentration of nickel is less than 0.1mg/L.
Standard in view of nickel qualified discharge is that concentration is less than 0.1mg/L, further can ensure to reach by step 204
Mark discharge.Certainly, because step 201-203 can also make the concentration of nickel be less than 0.1mg/L in most cases, can test in advance
The nickel concentration after step 201-203 is demonstrate,proved, considers further that whether select step 204.
In the present embodiment, the ion exchange of step 204 can use chelating class ion exchange resin.
Fig. 3 is the processing equipment schematic diagram of the chemical nickle-plating wastewater of one embodiment of the invention.With reference to shown in figure 3, waste water is first
Into collecting pit 301, then enter batch reactor 203 through water-delivery pump 302.In batch reactor 203, step is performed
201-203.Add various reagents to be reacted, the precipitation of reaction is discharged as sludge from bottom, and clear water continues through elevator pump
304 are transported to optional ion exchange tower 305.Enter filtered water tank 306 after ion exchange.
For the example of some practical applications.
Certain company's chemical nickel plating waste solution, raw water reach 4g/L containing nickel concentration, and pH value is 8.5.Using the side of the embodiment of the present invention
Method is handled, the uncomfortable pH value of raw water, adds 4g/L sodium dithionite, is reacted 30 minutes；PH value is adjusted to 11.0；Add
0.5g/L calcium chloride, after reacting 10 minutes, add a small amount of PAM flocculation sediments；Water outlet reaches 3.6mg/L containing nickel concentration, removes
Rate reaches 99.9%；By the water outlet after chelating resin, water outlet 0.087mg/L containing nickel concentration, reach《Electroplate pollutant emission mark
Quasi- GB21900-2008》Special discharge limitation require.The total phosphorus in waste water also has original 2200mg/L near simultaneously
300mg/L, clearance reach 86%.
Certain company's chemical nickle-plating wastewater, raw water reach 53.6mg/L containing nickel concentration, and pH value is entered using the technology of the present invention 6.7
Row processing, regulation raw water pH value add 1.5g/L sodium dithionite to 9.0, after reaction 30 minutes, regulation pH value to
10.9,0.3g/L calcium chloride is added, after reacting 10 minutes, adds a small amount of PAM flocculation sediments, water outlet reaches containing nickel concentration
0.06mg/L, reach《Electroplate pollutant emission standard GB21900-2008》Special emission limit requirement.
The present invention has following unique distinction：
1st, technological process is simple, and operation is simple, and processing cost is low, and operation maintenance is convenient, and treatment effect is reliable and stable；
2nd, using the single reducing agent of sodium dithionite, complex state nickel separate out in chemical nickle-plating wastewater is made, so as to real
The now efficient removal Jing Guo a chemical precipitation, for pH value of waste water without repeatedly adjusting, sedimentation effect is good；
3rd, it subsequently can not only promote chemical precipitation using calcium salt, and can realize that the part of phosphorus removes；
4th, advanced treating uses chelating ion exchange resin, it can be ensured that the stably reaching standard of final outflow water.
Although the present invention describes with reference to current specific embodiment, those of ordinary skill in the art
It should be appreciated that the embodiment of the above is intended merely to the explanation present invention, can also make in the case of without departing from spirit of the invention
Go out various equivalent change or replacement, therefore, as long as change, change in the spirit of the present invention to above-described embodiment
Type will all fall in the range of following claims.
Claims (6)
1. a kind of processing method of chemical nickle-plating wastewater, comprises the following steps：
Under conditions of pH value 7-9, the sodium dithionite that 1~9g/L is added in chemical nickle-plating wastewater carries out reduction reaction,
Reaction more than 10 minutes；
The pH value of chemical nickle-plating wastewater is adjusted to more than 10；And
0.2~1g/L calcium salt is added in chemical nickle-plating wastewater, after reacting more than 10 minutes, flocculant is added and flocculate and sink
Form sediment.
2. the processing method of chemical nickle-plating wastewater according to claim 1, it is characterised in that also include giving up chemical nickel plating
The pH value of water is adjusted to 7~9.
3. the processing method of chemical nickle-plating wastewater according to claim 1, it is characterised in that after flocculation sediment is carried out,
Also include chemical nickle-plating wastewater carrying out ion exchange, to ensure that the concentration of nickel is less than 0.1mg/L.
4. the processing method of chemical nickle-plating wastewater according to claim 1, it is characterised in that the ion exchange uses chelating
Class ion exchange resin.
5. the processing method of chemical nickle-plating wastewater according to claim 1, it is characterised in that the calcium salt is calcium chloride or hydrogen
Calcium oxide.
6. the processing method of chemical nickle-plating wastewater according to claim 1, it is characterised in that the flocculant is PAM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610613342.XA CN107662984A (en) | 2016-07-29 | 2016-07-29 | The processing method of chemical nickle-plating wastewater |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610613342.XA CN107662984A (en) | 2016-07-29 | 2016-07-29 | The processing method of chemical nickle-plating wastewater |
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| CN201610613342.XA Pending CN107662984A (en) | 2016-07-29 | 2016-07-29 | The processing method of chemical nickle-plating wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111170499A (en) * | 2019-12-28 | 2020-05-19 | 湖南中冶艾迪环保资源开发有限公司 | Method for recovering nickel sulfate from nickel electroplating waste liquid |
| CN115259466A (en) * | 2022-08-05 | 2022-11-01 | 广东先导稀材股份有限公司 | Method for treating nickel in high-ammonia-nitrogen high-salt wastewater |
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| JP2014198288A (en) * | 2013-03-29 | 2014-10-23 | 栗田工業株式会社 | Method for treating poorly biodegradable organic matter-containing water and treatment apparatus thereof |
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| CN111170499A (en) * | 2019-12-28 | 2020-05-19 | 湖南中冶艾迪环保资源开发有限公司 | Method for recovering nickel sulfate from nickel electroplating waste liquid |
| CN115259466A (en) * | 2022-08-05 | 2022-11-01 | 广东先导稀材股份有限公司 | Method for treating nickel in high-ammonia-nitrogen high-salt wastewater |
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Application publication date: 20180206 |