CN106167313A - A kind of discoloration method of electroplating wastewater - Google Patents
A kind of discoloration method of electroplating wastewater Download PDFInfo
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- CN106167313A CN106167313A CN201610683866.6A CN201610683866A CN106167313A CN 106167313 A CN106167313 A CN 106167313A CN 201610683866 A CN201610683866 A CN 201610683866A CN 106167313 A CN106167313 A CN 106167313A
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- electroplating wastewater
- colourity
- discoloration method
- sodium dithionite
- wastewater
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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
- C02F1/54—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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
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- Organic Chemistry (AREA)
Abstract
The invention discloses the discoloration method of a kind of electroplating wastewater, operating procedure and process conditions is: first add acid in electroplating wastewater, makes pH value regulate and control to 2.0 ~ 5.5；Then add strong reductant sodium dithionite mix homogeneously, carry out decoloring reaction under agitation；Adding nonionic high polymer coagulant PAM in mixed liquor again, then carry out solid-liquid separation, precipitate carries out harmless treatment；The colourity of monitoring clear liquid, if colourity is higher than 50 times, enters circulation bleaching process, until the colourity of water reaches primary standard in " integrated wastewater discharge standard " (GB8978 1996) after processing.The discoloration method of this electroplating wastewater has simple to operate, low cost, decolorizing efficiency height, good decolorizing effect and the advantage not producing secondary pollution.
Description
Technical field
The present invention relates to technology for treating industrial waste water, particularly to a kind of electroplating wastewater discoloration method containing reserve salt.
Background technology
Plating, as a kind of process for treating surface, all played an important role in many fields.Electroplating process typically wraps
Include pretreatment process, plating and strip process, each workshop section all can output waste water, and wash away the surface water, coating bath percolating water, equipment
Cooling water etc. collectively forms electroplating wastewater.Electroplating wastewater water quality is complicated, containing contents of many kinds of heavy metal ion and cyanide, and its Organic substance
Content is high, and colourity is high, and some belongs to carcinogenic, teratogenesis, mutagenic extremely toxic substance, if not dealing carefully with, it will serious harm week
Surrounding environment, jeopardizes human health.Along with the appearance in succession of the tightest environmental law Yu " ten, water ", China is to environmental conservation the most more and more
Pay attention to, electroplating industry Conventional pollution such as heavy metal, cyanide, CODcr treatment technology up to standard the most ripe, but electroplating wastewater
A difficult problem for industry is always perplexed in decolouring, and conventional oxychloride method and high-level oxidation technology exist that dosing is big, cost is high, de-
Color difficulty is big, easily return the problems such as color, such as Fenton oxidation method after decolouring is only capable of removing the colourity of 70%.
During plating strip, the use of reserve salt (such as m-nitrobenzene sodium sulfonate) is the reason causing waste water to develop the color, and face
The chromic color of normal complexion is very much like.Reducing process decolouring is used for electroplating wastewater decolouring field, Chinese patent
CN104098170B is disclosed " discoloration method of a kind of electroplating wastewater and system ", and the method is by adding NaBH4/NaHSO3Mixed
Closing the colourity of liquid reduction treatment electroplating wastewater, water outlet can process to clear, colorless, but this technique needs to prepare NaBH4-NaOH is molten
Liquid, NaHSO3Solution and NaBH4/NaHSO3Reduction system, operates not convenient and NaBH4Price is high；Additionally, Beijing, Shanghai,
The discharge standard of the clearly total boron of local integrated wastewater discharge standard, the integrated wastewater that wherein District of Shanghai performs are formulated in the ground such as Liaoning
Boron≤5 mg/L in discharge standard, it is seen that NaBH4Use can cause secondary pollution of water.
Summary of the invention
It is an object of the invention to provide a kind of simple to operate, low cost, decolorizing efficiency, decolouring is high effective and does not produces
The discoloration method of the electroplating wastewater of secondary pollution.
For realizing object above, the discoloration method of a kind of electroplating wastewater of the present invention include pH regulation and control, reduction, solid-liquid separation and
Circulation four operations of decolouring, concrete operation step and process conditions are as follows:
The first step, pH regulation process: add acid in electroplating wastewater, make electroplating wastewater pH value regulate and control to 2.0 ~ 5.5；
Second step, reduction process: in the electroplating wastewater of the adjusted pH value of the first step, add strong reductant sodium dithionite also
Mix homogeneously, carries out decoloring reaction under agitation；
3rd step, solid-liquid separation: in the mixed liquor that second step obtains, add nonionic high polymer coagulant PAM, then enter
Row solid-liquid separation, precipitate carries out harmless treatment；The colourity of monitoring clear liquid, if colourity is higher than 50 times, enters next step circulation
Bleaching process；
4th step, circulation decolouring: when the colourity of clear liquid is higher than 50 times, repetition first is to three step process step, after processing
The colourity of water reaches primary standard in " integrated wastewater discharge standard " (GB8978-1996).
The preferred span of control of pH value of the described first step is 2.5 ~ 3.5.
The better value of the pH of the described first step is 3.0.
The feed postition of described sodium dithionite is the one in solid form or aqueous solution form.
The addition of described sodium dithionite and the colourity negative correlation of waste water, when chroma in waste water is more than 2000 times, connect
The addition of sodium sulfite is 0.1 ~ 0.5 g/L；When chroma in waste water is 500-2000 times, the addition of sodium dithionite
It is 0.5 ~ 1.5 g/L；When chroma in waste water is less than 500 times, addition 1.5 g/L of sodium dithionite.
The time of the stirring reaction in described second step is 5 min.
Solid-liquid separating method in described 3rd step is the one in coagulating sedimentation, dense precipitation, filtration and filter-pressing method
Or the combination of several method.
Circulation decolouring in described 4th step is twice circulation, until water body chroma is not more than 50 times after Chu Liing.
The discoloration method of above-mentioned a kind of electroplating wastewater uses the sodium dithionite of strong reducing property to process electroplating wastewater, removing
The colourity of electroplating wastewater, after process, effluent color dilution can meet " integrated wastewater discharge standard " (GB8978-1996) primary standard.Should
Method is compared other discoloration method and is had the advantage that
1, simple to operate, technological process is short, and decolorizing efficiency is high, and electroplating wastewater colourity can be processed to less than 50 times by the short time；
2, dosing is low and source is wide, can save operating cost about 30%；
3, colourity≤50 times, can meet " integrated wastewater discharge standard " (GB8978-1996) primary standard, and before and after process, colourity is total
Removal efficiency is not less than 85%；
4, the reproducibility medicament used does not results in the secondary pollution of water body；
5, waste water is naturally placed after decolouring or is added oxidant and do not returns color.
The discoloration method of a kind of electroplating wastewater of the present invention is by adding strong reductant hydrosulfurous acid under certain pH conditions
Sodium carries out reduction-decolor reaction, then makes colour developing Organic substance carry out solid-liquid separation after precipitating by adding flocculant PAM, it is achieved process
Rear chroma in waste water is less than 50 times, and can stably reach country " integrated wastewater discharge standard " (GB8978-1996) primary standard.Should
The low source of method dosing is wide, and decolorizing efficiency is high, can solve well easily to return color after electroplating wastewater is difficult to decolouring, decolouring
Problem, and do not introduce secondary pollution.
Detailed description of the invention
Discoloration method below in conjunction with specific embodiment electroplating wastewater a kind of to the present invention is described in further detail.
Embodiment 1
Electroplating wastewater is from certain Electroplate Factory, and its pH is 11.8, and colourity is 3000 times.
Take this electroplating wastewater of 10 L, use the discoloration method of a kind of electroplating wastewater of the present invention by following operating procedure and technique
Condition processes:
The first step: pH regulation process.The pH using concentrated sulphuric acid regulation electroplating wastewater is 3.0.
Second step: reduction process.The hydrosulfurous acid of 0.5 g/L is added in the electroplating wastewater of above-mentioned adjusted pH value
Sodium, mix homogeneously, stirring reaction 10 min, complete decolouring, then carry out next step solid-liquid separation.
3rd step: solid-liquid separation process.Preparation nonionic PAM solution, concentration 1 wt ‰, addition in every liter of water in advance
Being 2.0 mL, standing sedimentation 10 min, solid-liquid separation, sediment stores up subsequent treatment, and processing effluent color dilution is 400 times, and colourity takes off
Except rate reaches 87%, processing water outlet pH is 4.5；Under sunlight condition after accumulative standing 24 h, without substantially returning color phenomenon.
4th step: circulation decolouring.Repeat the first step to three step process step, sodium dithionite addition in this circulation
Being 1.5 g/L, processing effluent color dilution is 30 times, and colourity removal efficiency reaches 93%, and processing water outlet pH is 4.0；Add containing effective chlorine 25%
Bleaching powder 10 g/L, stirring reaction is not less than 2 h, without substantially returning color phenomenon.
This total removal efficiency of embodiment colourity is 99%.
Embodiment 2
Electroplating wastewater pH is 8.5, and colourity is 800 times.
Repeat electroplating wastewater by the same steps of example 1, but except for the difference that first step hydrochloric acid regulates electroplating wastewater
PH is 2.2；In second step, sodium dithionite consumption is 1.0 g/L, all other technical parameters and step and embodiment 1 phase
With；After single treatment, effluent color dilution is 50 times；After placing 24 h under ultraviolet irradiation condition, without substantially returning color phenomenon.
This total removal efficiency of embodiment colourity is 94%.
Contrast both examples above, the comprehensive technical indexes of embodiment 1 is more preferable, is most preferred embodiment.
It should be pointed out that, above-described embodiment is only the present invention preferably embodiment, on the application of the present invention is not limited to
State citing, for those of ordinary skills, under the premise without departing from the principles of the invention, it is also possible to according to the above description
Being improved or modify, all these improvement or modification all should fall in the protection domain of the claims in the present invention.
Claims (8)
1. a discoloration method for electroplating wastewater, is characterized in that: it includes pH regulation and control, reduction, solid-liquid separation and circulation decolouring four
Individual operation, concrete operation step and process conditions are as follows:
The first step, pH regulation process: add acid in electroplating wastewater, make electroplating wastewater pH value regulate and control to 2.0 ~ 5.5；
Second step, reduction process: in the electroplating wastewater of the adjusted pH value of the first step, add strong reductant sodium dithionite also
Mix homogeneously, carries out decoloring reaction under agitation；
3rd step, solid-liquid separation: in the mixed liquor that second step obtains, add nonionic high polymer coagulant PAM, then enter
Row solid-liquid separation, precipitate carries out harmless treatment；The colourity of monitoring clear liquid, if colourity is higher than 50 times, enters next step circulation
Bleaching process；
4th step, circulation decolouring: when the colourity of clear liquid is higher than 50 times, repetition first is to three step process step, after processing
The colourity of water reaches primary standard in " integrated wastewater discharge standard " (GB8978-1996).
The discoloration method of a kind of electroplating wastewater the most as claimed in claim 1, is characterized in that: the preferably control of pH value in the described first step
Scope processed is 2.5 ~ 3.5.
The discoloration method of a kind of electroplating wastewater the most as claimed in claim 1 or 2, is characterized in that: more preferably pH in the described first step
Value is 3.0.
The discoloration method of a kind of electroplating wastewater the most as claimed in claim 1, is characterized in that: the addition side of described sodium dithionite
Formula is the one in solid form or aqueous solution form.
5. the discoloration method of a kind of electroplating wastewater as described in claim 1 or 4, is characterized in that: adding of described sodium dithionite
Entering the colourity negative correlation of amount and waste water, when chroma in waste water is more than 2000 times, the addition of sodium dithionite is 0.1 ~ 0.5
g/L；When chroma in waste water is 500-2000 times, the addition of sodium dithionite is 0.5 ~ 1.5 g/L；When chroma in waste water is less than
When 500 times, addition 1.5 g/L of sodium dithionite.
The discoloration method of a kind of electroplating wastewater the most as claimed in claim 1, is characterized in that: the stirring reaction in described second step
Time be 5 min.
The discoloration method of a kind of electroplating wastewater the most as claimed in claim 1, is characterized in that: the solid-liquid separation side in described 3rd step
Method is the combination of one or more methods in coagulating sedimentation, dense precipitation, filtration and filter-pressing method.
The discoloration method of a kind of electroplating wastewater the most as claimed in claim 1, is characterized in that: the circulation decolouring in described 4th step is
Twice circulation, until water body chroma is not more than 50 times after Chu Liing.
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| CN201610683866.6A CN106167313B (en) | 2016-08-18 | 2016-08-18 | A kind of discoloration method of electroplating wastewater |
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| CN201610683866.6A CN106167313B (en) | 2016-08-18 | 2016-08-18 | A kind of discoloration method of electroplating wastewater |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058469A (en) * | 2007-05-23 | 2007-10-24 | 泉州师范学院 | supplementary decoloration process for dye-containing waste water |
| JP2009189992A (en) * | 2008-02-18 | 2009-08-27 | Tsurui Chemical Co Ltd | Method for recovering and removing brominated flame retardant |
| CN104098170A (en) * | 2014-07-17 | 2014-10-15 | 浙江海拓环境技术有限公司 | Decoloration method and system for electroplating wastewater |
| CN105858973A (en) * | 2016-06-14 | 2016-08-17 | 沧州泓海化工有限公司 | Hexavalent-chromium wastewater treatment technology |
-
2016
- 2016-08-18 CN CN201610683866.6A patent/CN106167313B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101058469A (en) * | 2007-05-23 | 2007-10-24 | 泉州师范学院 | supplementary decoloration process for dye-containing waste water |
| JP2009189992A (en) * | 2008-02-18 | 2009-08-27 | Tsurui Chemical Co Ltd | Method for recovering and removing brominated flame retardant |
| CN104098170A (en) * | 2014-07-17 | 2014-10-15 | 浙江海拓环境技术有限公司 | Decoloration method and system for electroplating wastewater |
| CN105858973A (en) * | 2016-06-14 | 2016-08-17 | 沧州泓海化工有限公司 | Hexavalent-chromium wastewater treatment technology |
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