CN104098170A - Decoloration method and system for electroplating wastewater - Google Patents
Decoloration method and system for electroplating wastewater Download PDFInfo
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- CN104098170A CN104098170A CN201410341485.0A CN201410341485A CN104098170A CN 104098170 A CN104098170 A CN 104098170A CN 201410341485 A CN201410341485 A CN 201410341485A CN 104098170 A CN104098170 A CN 104098170A
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Abstract
The invention belongs to the field of wastewater treatment, and particularly discloses a decoloration method and system for electroplating wastewater. According to the method, a certain quantity of strong reducing agent systems NaBH4/NaHSO3 at certain proportions is added into final settlement tank effluent with a pH (potential of hydrogen) value of 7 in the electroplating wastewater, the mixture is uniformly stirred to stabilize the pH, a dilute sulphuric acid solution is added to adjust the pH to 7.0-8.0, wastewater containing resist salt is treated to be transparent and colorless in 1-10 minutes, and color reversion phenomenon is not caused during natural placement or after oxidizing agents such as sodium hypochlorite and the like are added. The treatment system based on the decoloration method for electroplating wastewater comprises a preparation chamber, a NO.1 reaction tank, a NO.2 reaction tank, a pH adjusting tank and the like, wherein the preparation chamber comprises a NaBH4 solution (containing 10%-40% of NaOH) preparation bucket, a NaHSO3 solution preparation bucket, a reaction system preparation bucket, a sulfuric acid storage bucket and a liquid caustic soda storage bucket. The method and the system have the characteristics of high electroplating wastewater decoloration efficiency, low probability of color reversion and the like.
Description
Technical field
The present invention relates to the decolouring treatment technology of electroplating wastewater, particularly a kind of electroplating wastewater decoloring method and system containing reserve salt.
Background technology
Electroplating sewerage complicated component, is mainly derived from plating piece pre-treatment sewage, coating rinse water, coating aftertreatment sewage and electroplating effluent.According to its pollutant characteristic, can be divided into pre-treatment oily(waste)water, high concentration chrome wastewater, cyanogens-containing sewage water, containing other heavy metal containing sewage, soda acid sewage.Electroplate rinsing sewage contains the multiple toxic substances such as prussiate, sexavalent chrome, copper, nickel, zinc conventionally.If not treated or only with regard to discharge meeting, environment is caused to great threat through simple processing.
Present stage, along with China more and more payes attention to environment protection and the progressively development of green technology, electroplating industry has very large progress from fermentation such as cleaner production and tail water treatment technologies.The removal technology up to standard of the conventional pollutents such as heavy metal ion, prussiate and COD is also ripe gradually, yet electroplating wastewater colourity problem is but difficult to be resolved always.At present, electroplating wastewater is after FEOL is processed, and conventional sense index is substantially up to standard, but water outlet has the phenomenon of jaundice always.And decolour and process rear or be difficult to decolouring by the existing methods such as chlorine class oxygenant and high-level oxidation technology and technology, after decolouring, return soon look phenomenon, discharge outlet effluent color dilution is difficult to up to standard, therefore and these method dosings are large, no matter from technical feasibility with can all be difficult to reach requirement economic feasibility.To this, we study invention a kind of can be low-cost, the decolouring of the electroplating wastewater containing reserve salt treatment technology that efficiency is high.
Summary of the invention
In order to overcome the defect of existing electroplating wastewater decolouring treatment technology, the present invention aims to provide a kind of electroplating wastewater decoloring method that can cost is low, speed is fast, decolorizing efficiency is high.
Another object of the present invention is to provide a kind of electroplating wastewater decolouring system that realizes above-mentioned electroplating wastewater decoloring method.
To achieve these goals, technical scheme of the present invention is as follows
An electroplating wastewater decoloring method, comprises following treatment step:
(1) in cooling bath, configure 10%～40% aqueous sodium hydroxide solution, sodium hydroxide dissolve completely and cooling after, add NaBH
4be configured to containing 5%～20%NaBH
4solution.
(2) configuration 5%～20%NaHSO
3the aqueous solution.
(3) configuration of reduction system: take volume ratio as 1:100～1:50 is by NaBH step (1) Suo Shu
4solution adds to the described NaHSO of step (2)
3the aqueous solution, limit edged mixes.
(4) take volume ratio and reduction system step (3) Suo Shu is added in the yellow electroplating wastewater containing reserve salt as 1:100～1:50, stirring and evenly mixing, carries out initial reaction, and the reaction times is controlled at 5～10min.After pH is stable, add sulphur acid for adjusting pH extremely, 7.0～8.0, the rapid reaction stage is proceeded, after 1～10min, can realize decolouring.
Based on above-mentioned decoloring method, the present invention also provides a kind of concrete electroplating wastewater decolouring system, this system comprise make up a prescription between, 1# reaction tank, 2# reaction tank and pH adjustment pond etc.It is characterized in that: described in comprise 1# compounding bin, 2# compounding bin, 3# compounding bin, sulfuric acid medicine storing drum and liquid caustic soda medicine storing drum between making up a prescription; Described 1# reaction tank is connected by the water pipe with peristaltic pump and under meter with pre-treatment clean water basin, is furnished with electric blender simultaneously; Described 2# reaction tank by being connected with the water pipe of under meter with valve, is furnished with electric blender and pH meter with 1# reaction tank simultaneously; Described pH adjusts pond and is connected by water pipe with 2# reaction tank, and is furnished with electric blender and pH meter.
The concentration that artificial preparation is housed in described 1# compounding bin is 5%～20%NaBH
4solution (10%～40%NaOH), is equipped with electric blender.
In described 2# compounding bin, 5%～20%NaHSO is housed
3the aqueous solution, is equipped with electric blender.
Described 3# compounding bin is furnished with electric blender, by the UPVC drug-transmitting pipe with peristaltic pump and under meter, is connected to 1# reaction tank, is connected respectively by the UPVC drug-transmitting pipe with peristaltic pump, valve and under meter with 1# compounding bin with 2# compounding bin simultaneously.
Described sulfuric acid medicine storing drum is equipped with sulfuric acid, by being with valvular UPVC drug-transmitting pipe to adjust pond with 2# reaction tank with pH respectively, is connected.
Described liquid caustic soda medicine storing drum is equipped with 30% liquid caustic soda, by being with valvular UPVC drug-transmitting pipe to adjust pond with 2# reaction tank with pH, is connected.
Than existing electroplating wastewater decolouring technology, the present invention has following advantage:
(1) the technology of the present invention realizes decolouring object by the main component reserve salt of colourity contribution in reduction electroplating wastewater, its medicament usage quantity is little and without sludge creation, the residence time (reaction times) is short, saved the floor space of a large amount of reagent consumption and treatment facility, the technology of the present invention can be saved working cost 20%～50% than common Fenton and other advanced treatment technology.
(2) the present invention is simple to operation, and treatment effect is good, can realize yellow electroplating wastewater clean water basin effluent color dilution is down to below 5 times, even water white transparency in the short period of time.
(3) electroplating wastewater that in addition the technology of the present invention was processed, regardless of being all difficult to return look phenomenon naturally placing or add under oxygenant condition, is almost better than current all electroplating wastewater decolouring technologies in this.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of electroplating wastewater decolouring system of the present invention, wherein
1 is pre-treatment water reservoir, and 2 is 1# reaction tank, and 3 is 2# reaction tank, 4 for pH adjusts pond, and 5 between making up a prescription, and 6 is 1# compounding bin, 1 is 2# compounding bin, and 8 is 3# compounding bin, and 9 is sulfuric acid medicine storing drum, 10 is liquid caustic soda medicine storing drum, 11 is peristaltic pump, and 12 is under meter, and 13 is valve, 14 is electric blender, and 15 is pH meter.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
As shown in Figure 1, between making up a prescription, in 5 1# compounding bin 6, first configure 20% aqueous sodium hydroxide solution, sodium hydroxide dissolve completely and cooling after, then add NaBH
4be configured to containing 10%NaBH
4solution; In 3# compounding bin 8, configure 5% NaHSO
3the aqueous solution; In 2# compounding bin 7, be NaBH
4/ NaHSO
3reduction system, by 6 Chinese medicines and 8 Chinese medicines according to the volume ratio of 1:50 mix, now with the current.It in medicine storing drum 9, is 20% dilute sulphuric acid; In medicine storing drum 10, be 30% liquid caustic soda solution.Electroplating wastewater (colourity is about 300 times) yellow in pre-treatment tank 1 is squeezed into 1# reaction tank 2 by peristaltic pump 11, utilize under meter 12 and valve 13 to control flooding quantity, in 2, pass into the medicament in 7 simultaneously, keeping medicament and flooding velocity ratio is 1:100, keep electric blender 14 constantly to stir, keeping the residence time (reaction times) is 5min.14 water outlet (pH is greater than 9.0) is by entering 2# reaction tank 3 from stream mode, by the pH value of pH meter 15 monitoring waste water, by the dilute sulphuric acid adding in 9, control pH at pH=7, keeping the residence time is that 10min can find that 3 water outlet waste water becomes maintenance clarification (colourity is less than 5 times), and its water outlet pH is 7.5.In 3, water outlet enters behind pH adjustment pond 4, and controlling pH is 7.0, can arrange outward by discharge outlet.It is transparent limpid that outer row's waste water keeps in standing 12h, without obviously returning look phenomenon.
Above-described embodiment is only preferably embodiment of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any deviates from change, the modification made under spirit of the present invention and principle, substitutes, combination, simplify; all should be considered as equivalent substitute mode, all be included in protection scope of the present invention.
Claims (7)
1. a decoloring method for electroplating wastewater, its feature comprises the following steps:
(1) in cooling bath, configure 10%～40% aqueous sodium hydroxide solution, sodium hydroxide dissolve completely and cooling after, add NaBH
4be configured to containing 5%～20%NaBH
4solution.
(2) configuration 5%～20%NaHSO
3the aqueous solution.
(3) configuration of reduction system: take volume ratio as 1:100～1:50 is by NaBH step (1) Suo Shu
4solution adds to the described NaHSO of step (2)
3the aqueous solution, limit edged mixes.
(4) take volume ratio and reduction system step (3) Suo Shu is added in yellow electroplating wastewater as 1:100～1:50, stirring and evenly mixing, carries out initial reaction, and the reaction times is controlled at 5～10min.After pH is stable, add sulphur acid for adjusting pH to 6.0～8.0.
(5) after the chroma in waste water decolouring of processing until step (4), regulating pH is 7.0.
2. the decoloring method of a kind of electroplating wastewater according to claim 1, is characterized in that: the NaHSO that step (2) is described
3can use Na
2sO
3substitute.
3. according to the decoloring method of a kind of electroplating wastewater claimed in claim 1, it is characterized in that: the described yellow electroplating wastewater of step (4) for using the waste water that has used reserve salt after reserve salt in electroplate technology, this waste water is after existing materialization treatment technology and biochemical processing method processing, under other conventional sense index prerequisite up to standard, colourity cannot be removed.
4. the decolouring system of the electroplating wastewater of a decoloring method of realizing electroplating wastewater claimed in claim 1, comprise make up a prescription between, 1# reaction tank, 2# reaction tank and pH adjust pond, it is characterized in that: described in comprise 1# compounding bin, 2# compounding bin, 3# compounding bin, sulfuric acid medicine storing drum and liquid caustic soda medicine storing drum between making up a prescription; Described 1# reaction tank is connected by the water pipe with peristaltic pump and under meter with pre-treatment clean water basin, is furnished with electric blender simultaneously; Described 2# reaction tank by being connected with the water pipe of under meter with valve, is furnished with electric blender and pH meter with 1# reaction tank simultaneously; Described pH adjusts pond and is connected by water pipe with 2# reaction tank, and is furnished with electric blender and pH meter.
The concentration that artificial preparation is housed in described 1# compounding bin is 5%～20%NaBH
4solution (10%～40%NaOH), is equipped with electric blender.
In described 2# compounding bin, 5%～20%NaHSO is housed
3the aqueous solution, is equipped with electric blender.
Described 3# compounding bin is furnished with electric blender, by the UPVC drug-transmitting pipe with peristaltic pump and under meter, is connected to 1# reaction tank, is connected respectively by the UPVC drug-transmitting pipe with peristaltic pump, valve and under meter with 1# compounding bin with 2# compounding bin simultaneously.
Described sulfuric acid medicine storing drum is equipped with sulfuric acid, by being with valvular UPVC drug-transmitting pipe to adjust pond with 2# reaction tank with pH respectively, is connected.
Described liquid caustic soda medicine storing drum is equipped with 30% liquid caustic soda, by being with valvular UPVC drug-transmitting pipe to adjust pond with 2# reaction tank with pH, is connected.
5. system according to claim 5, is characterized in that: the pH meter in described 2# reaction tank and pH adjustment pond can automatically be controlled medicine system with the pH purchasing on market and substitute.
6. system according to claim 5, is characterized in that: the reagent of described 2# compounding bin is now with the current.
7. system according to claim 5, is characterized in that: it is discharge outlet that described pH adjusts pond end, its water outlet after naturally placing and after adding other oxygenant nothing obviously return look phenomenon.
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|---|---|---|---|
| CN201410341485.0A CN104098170B (en) | 2014-07-17 | 2014-07-17 | A kind of decoloring method of electroplating wastewater and system |
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| CN104098170B CN104098170B (en) | 2015-10-28 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104556476A (en) * | 2014-12-23 | 2015-04-29 | 东莞市粤威环保科技有限公司 | Method of treating reserve salt of sodium m-nitro-p-toluenesulfonate in electroplating wastewater harmlessly |
| CN106167313A (en) * | 2016-08-18 | 2016-11-30 | 紫金矿业集团股份有限公司 | A kind of discoloration method of electroplating wastewater |
| CN106396192A (en) * | 2016-11-22 | 2017-02-15 | 镇江市和云工业废水处置有限公司 | Treatment process of reserve salt S containing stripping solution |
Citations (2)
| 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 |
| CN101531418A (en) * | 2009-04-17 | 2009-09-16 | 同济大学 | Method for preparing composite material for water treatment and application thereof |
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2014
- 2014-07-17 CN CN201410341485.0A patent/CN104098170B/en active Active
Patent Citations (2)
| 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 |
| CN101531418A (en) * | 2009-04-17 | 2009-09-16 | 同济大学 | Method for preparing composite material for water treatment and application thereof |
Non-Patent Citations (1)
| Title |
|---|
| 季一友等: "混合办公废纸脱墨浆的漂白", 《纸和造纸》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104556476A (en) * | 2014-12-23 | 2015-04-29 | 东莞市粤威环保科技有限公司 | Method of treating reserve salt of sodium m-nitro-p-toluenesulfonate in electroplating wastewater harmlessly |
| CN106167313A (en) * | 2016-08-18 | 2016-11-30 | 紫金矿业集团股份有限公司 | A kind of discoloration method of electroplating wastewater |
| CN106167313B (en) * | 2016-08-18 | 2019-04-12 | 紫金矿业集团股份有限公司 | A kind of discoloration method of electroplating wastewater |
| CN106396192A (en) * | 2016-11-22 | 2017-02-15 | 镇江市和云工业废水处置有限公司 | Treatment process of reserve salt S containing stripping solution |
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|---|---|
| CN104098170B (en) | 2015-10-28 |
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