CN110395815A - A kind of processing method of acidity electroplating wastewater of chromium - Google Patents
A kind of processing method of acidity electroplating wastewater of chromium Download PDFInfo
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- CN110395815A CN110395815A CN201910632377.1A CN201910632377A CN110395815A CN 110395815 A CN110395815 A CN 110395815A CN 201910632377 A CN201910632377 A CN 201910632377A CN 110395815 A CN110395815 A CN 110395815A
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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
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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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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- Environmental & Geological Engineering (AREA)
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- Treatment Of Water By Oxidation Or Reduction (AREA)
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Abstract
The invention belongs to electroplating wastewater processing fields, and in particular to a kind of processing method of acidity electroplating wastewater of chromium.Specific processing step is as follows: hydrazine hydrate dilution being added drop-wise in acid electroplating wastewater of chromium, adjusting its pH value is 7.9~8.8, then proceedes to stir, obtains mixed solution；To mixed solution and dripping composite iron salt solution, and continue to stir；Polyacrylamide solution is added into mixed solution again and carries out flocculation sedimentation, continues to stir, is then separated by solid-liquid separation, liquid is recycled by treated.This method can reduce the use of lime and molysite, reduce cost, and can chromium in the solution of high efficiency synchronous place to go, copper and mickel, it can be achieved that acid electroplating wastewater of chromium high-efficient purification.
Description
Technical field
The invention belongs to electroplating wastewater processing fields, and in particular to a kind of processing method of acidity electroplating wastewater of chromium.
Background technique
The fast development of electroplating industry, adjoint is a large amount of electroplating wastewater discharge, and environmental pollution causes can not
Inverse serious harm, while the health of the mankind can also be posed a serious threat.Often containing a large amount of more in electroplating wastewater
Heavy metal species ion (chromium, copper, nickel etc.), these metal ions are eventually as drinking water source or aquatic products group food Zhong enter to human body
It is interior, influence human health, it is therefore necessary to strict control outlet heavy metal out of electroplating wastewater content, especially answer priority control toxicity compared with
The discharge of big chromium.
The common processing method of electroplating wastewater has chemical precipitation method, membrane separation process, absorption method etc..Wherein membrane separating method is imitated
Fruit highest, but processing cost is very high；The adsorbed heavy metal ion of absorption method also needs to be further processed, costly and presence
The risk of secondary pollution；Chemical precipitation method is addition reducing agent (such as ferrous sulfate, sulfurous acid in the waste water containing hexavalent chromium
Sodium, iron powder etc.), by hexavalent chrome reduction at trivalent chromium after, be added waste water treating agent sodium hydroxide, adjust the pH value of waste water, be classified
The heavy metal ion in waste water is precipitated, finally also needs the supernatant pH value adjusted after precipitating by acid adding that could discharge.This
Outside, the general pH value also needed with lime or sodium hydroxide adjustment waste water during handling acid electroplating wastewater of chromium, from
And more waste residues can be generated, processing cost is further increased, and generally handled just for pollution of chromium, and the copper in waste water
It is then handled with nickel not exclusively.Using traditional chemical precipitation process electroplating wastewater, dosing is big, processing technological flow
Length, land occupation is more, investment is big, energy consumption is big, operational management difficulty is big, labor intensity of workers is big, operating cost is high, can't protect
Card wastewater treatment is steadily run.
Therefore, it is necessary to more further be studied acid electroplating wastewater of chromium, explore more effective, more convenient, more cheap
Processing technique, make it with more the utility value in industry.
Summary of the invention
Copper and mickel processing of the dosing greatly, in waste water is incomplete when to solve processing waste water containing chrome in the prior art asks
Topic, the present invention provide a kind of processing method of acid electroplating wastewater of chromium.
To achieve the above object, the invention adopts the following technical scheme:
The present invention provides a kind of processing method of acid electroplating wastewater of chromium, comprising the following steps:
Step A: hydrazine hydrate dilution is added drop-wise in acid electroplating wastewater of chromium, adjust its pH value be 7.9~8.8, then after
Continuous stirring, obtains mixed solution；The volume basis hundred of the hydrazine hydrate dilution is the 4~6% of acid electroplating wastewater of chromium；
Step B: to mixed solution and dripping composite iron salt solution, and continue to stir；The volume basis of the composite iron salt solution
Than 4~8% for acid electroplating wastewater of chromium；
Step C: polyacrylamide solution is added into mixed solution again and carries out flocculation sedimentation, continues to stir, then carries out solid-liquid
Separation, treated, and liquid is recycled；The percent by volume of the poly- propionyl amine aqueous solution is acid electroplating wastewater of chromium
0.1~0.3%.
Further, it according to volume ratio is 1:2~6 that hydrazine hydrate dilution, which is technical grade hydrazine hydrate and water, in the step A
Mixed diluting liquid, content >=80% of the technical grade hydrazine hydrate.
Further, the composite iron salt solution in the step B is the ratio of composite iron salt and water according to 10g:80~110mL
The solution that example mixes, the composite iron salt are made of the ferrous sulfate that mass ratio is 8~6:2~4 and bodied ferric sulfate.
Further, the polyacrylamide solution in the step C be by solid polypropylene amide and water according to 0.1~
The ratio of 0.5g:100mL is formulated.
Further, the stirring in the step A is 10~20min.
Further, the stirring in the step B is 2~8min.
Further, stirring is 2~5min in the step C.
Compared with prior art, the invention has the following advantages:
The present invention adjusts the pH value of acid electroplating wastewater of chromium using hydrazine hydrate dilution, while also by part Cr VI in solution
Originally it is trivalent chromium, the use of lime is not only eliminated during adjusting pH value, also reduces the usage amount of subsequent molysite, thus
The level of residue in water treatment procedure is reduced, the expense of general waste processing is reduced；Then secondary reduction is carried out with molysite compound
And precipitating, poly-ferric chloride and ferric coagulating sedimentation can chromium in the solution of high efficiency synchronous place to go, copper and mickel, it can be achieved that acid
Property electroplating wastewater of chromium high-efficient purification, finally using polyacrylamide carry out flocculation sedimentation, pass through be separated by solid-liquid separation after liquid
Middle content of 6-valence Cr ions is limited lower than detection, and the content of nickel and copper reduces 70% and 80% or more respectively, meets discharge standard, is passed through
The electroplating wastewater of processing can be used for plating piece cleaning and wash away mill floor, can be realized waste water safe reuse, operating cost is low, price
It is cheap, operability and application value with higher.
Specific embodiment
The present invention is described in further details combined with specific embodiments below, the electroplating wastewater used in following embodiment
It is all from Changge City, Henan Province electroplating enterprise.The chemicals of use is as follows: ferrous sulfate, FeSO4·7H2O >=99%, point
Analyse pure, Tianjin Kermel Chemical Reagent Co., Ltd.；Hydrazine hydrate analyzes pure, content >=80%, the close europeanized examination of Tianjin section
Agent Co., Ltd；Polyacrylamide analyzes pure, solid content >=90%, Tianjin Kermel Chemical Reagent Co., Ltd..
Embodiment 1
Hydrazine hydrate 10mL is taken, carries out mixed diluting with 50mL water, in case using；Weigh 8g ferrous sulfate and 2g bodied ferric sulfate into
Then mixture is dissolved in formation composite iron salt solution in 100mL water by row mixing, in case using；Weigh 0.1g solid polypropylene
Amide is dissolved in 100mL water, is configured to the polyacrylamide solution that concentration is 0.1%, in case using.
Acid electroplating wastewater of chromium 10mL is taken, addition 0.6mL hydrazine hydrate dilution adjustment solution ph is 8.8, is sufficiently stirred
20min is mixed, 0.8mL composite iron salt solution is added, mixes well 5min, adds 0.02mL polyacrylamide solution, is mixed
5min, filter paper filtering.Acid electroplating wastewater of chromium detects with treated before handling, and the results are shown in Table 1.
Before being handled in 1. embodiment 1 of table with treated acid electroplating wastewater of chromium testing result
| pH | Total chromium (mg/L) | Cr VI (mg/L) | Nickel (mg/L) | Copper (mg/L) | |
| Before processing | 3.4 | 407.3 | 320.7 | 0.45 | 1.69 |
| After processing | 8.6 | 0.0331 | — | 0.125 | 0.188 |
As can be seen from the table, the pH value of solution significantly improves after processing, has reached 8.6.Total chromium and Cr VI in solution
Content there is apparent decline, be reduced to respectively 0.0331mg/L and lower than detection limit.The content of nickel and copper also occurs bright
Aobvious decline, reduces 72.2% and 88.9% respectively.
Embodiment 2
Hydrazine hydrate 10mL is taken, carries out mixed diluting with 40mL water, in case using；Weigh 8g ferrous sulfate and 2g bodied ferric sulfate into
Then mixture is dissolved in formation composite iron salt solution in 100mL water by row mixing, in case using；Weigh 0.1g solid polypropylene
Amide is dissolved in 100mL water, is configured to the polyacrylamide solution that concentration is 0.1%, in case using.
Acid electroplating wastewater of chromium 10mL is taken, addition 0.6mL hydrazine hydrate dilution adjustment solution ph is 8.8, is sufficiently stirred
20min is mixed, 0.6mL composite iron salt solution is added, mixes well 5min, adds polyacrylamide solution 0.03mL, is stirred
2min, filter paper filtering.Acid electroplating wastewater of chromium detects with treated before handling, and the results are shown in Table 2.
Before being handled in 2. embodiment 2 of table with treated acid electroplating wastewater of chromium testing result
| pH | Total chromium (mg/L) | Cr VI (mg/L) | Nickel (mg/L) | Copper (mg/L) | |
| Before processing | 3.4 | 407.3 | 320.7 | 0.45 | 1.69 |
| After processing | 8.7 | 0.0314 | — | 0.134 | 0.288 |
As can be seen from the table, the pH value of solution significantly improves after processing, has reached 8.7.Total chromium and Cr VI contains in solution
There is apparent decline in amount, is reduced to 0.0314mg/L respectively and lower than detection limit.Under the content of nickel and copper also occurs obviously
Drop, reduces 70.2% and 83.0% respectively.
Embodiment 3
Hydrazine hydrate 10mL is taken, carries out mixed diluting with 30mL water, in case using；Weigh 8g ferrous sulfate and 2g bodied ferric sulfate into
Then mixture is dissolved in formation composite iron salt solution in 110mL water by row mixing, in case using；Weigh 0.3g solid polypropylene
Amide is dissolved in 100mL water, is configured to the polyacrylamide solution that concentration is 0.3%, in case using.
Acid electroplating wastewater of chromium 10mL is taken, addition 0.5mL hydrazine hydrate dilution adjustment solution ph is 8.5, is sufficiently stirred
10min is mixed, 0.6mL composite iron salt solution is added, mixes well 5min, adds polyacrylamide solution 0.01mL, is stirred
3min, filter paper filtering.Acid electroplating wastewater of chromium detects with treated before handling, and the results are shown in Table 3.
Before being handled in 3. embodiment 3 of table with treated acid electroplating wastewater of chromium testing result
| pH | Total chromium (mg/L) | Cr VI (mg/L) | Nickel (mg/L) | Copper (mg/L) | |
| Before processing | 3.4 | 407.3 | 320.7 | 0.45 | 1.69 |
| After processing | 8.2 | 0.0765 | — | 0.1193 | 0.317 |
As can be seen from the above table, the pH value of solution significantly improves after processing, has reached 8.2.Total chromium and Cr VI in solution
Content there is apparent decline, be reduced to respectively 0.0765mg/L and lower than detection limit.The content of nickel and copper also occurs bright
Aobvious decline, reduces 73.5% and 81.2% respectively.
Embodiment 4
Hydrazine hydrate 10mL is taken, carries out mixed diluting with 40mL water, in case using；Weigh 7g ferrous sulfate and 3g bodied ferric sulfate into
Then mixture is dissolved in formation composite iron salt solution in 80mL water by row mixing, in case using；Weigh 0.2g solid polypropylene acyl
Amine is dissolved in 100mL water, is configured to the polyacrylamide solution that concentration is 0.2%, in case using.
Acid electroplating wastewater of chromium 10mL is taken, addition 0.4mL hydrazine hydrate dilution adjustment solution ph is 7.9, is sufficiently stirred
15min is mixed, 0.6mL composite iron salt solution is added, mixes well 5min, adds polyacrylamide solution 0.01mL, is stirred
3min, filter paper filtering.Acid electroplating wastewater of chromium detects with treated before handling, and the results are shown in Table 4.
Before being handled in 4. embodiment 4 of table with treated acid electroplating wastewater of chromium testing result
| pH | Total chromium (mg/L) | Cr VI (mg/L) | Nickel (mg/L) | Copper (mg/L) | |
| Before processing | 3.4 | 407.3 | 320.7 | 0.45 | 1.69 |
| After processing | 7.6 | 0.06475 | — | 0.1056 | 0.0731 |
As can be seen from the above table, the pH value of solution significantly improves after processing, has reached 7.6.Total chromium and Cr VI in solution
Content there is apparent decline, be reduced to respectively 0.06475mg/L and lower than detection limit.The content of nickel and copper also occurs bright
Aobvious decline, reduces 76.5% and 95.7% respectively.
Embodiment 5
Hydrazine hydrate 10mL is taken, carries out mixed diluting with 20mL water, in case using；Weigh 6g ferrous sulfate and 4g bodied ferric sulfate into
Then mixture is dissolved in formation composite iron salt solution in 100mL water by row mixing, in case using；Weigh 0.2g solid polypropylene
Amide is dissolved in 100mL water, is configured to the polyacrylamide solution that concentration is 0.2%, in case using.
Acid electroplating wastewater of chromium 10mL is taken, addition 0.4mL hydrazine hydrate dilution adjustment solution ph is 7.9, is sufficiently stirred
20min is mixed, 0.4mL composite iron salt solution is added, mixes well 2min, adds polyacrylamide solution 0.01mL, is mixed
3min, filter paper filtering.Acid electroplating wastewater of chromium detects with treated before handling, and the results are shown in Table 5.
Before being handled in 5. embodiment 5 of table with treated acid electroplating wastewater of chromium testing result
| pH | Total chromium (mg/L) | Cr VI (mg/L) | Nickel (mg/L) | Copper (mg/L) | |
| Before processing | 3.4 | 407.3 | 320.7 | 0.45 | 1.69 |
| After processing | 7.6 | 0.0587 | — | 0.119 | 0.217 |
As can be seen from the above table, the pH value of solution significantly improves after processing, has reached 7.6.Total chromium and Cr VI in solution
Content there is apparent decline, be reduced to respectively 0.0587mg/L and lower than detection limit.The content of nickel and copper also occurs bright
Aobvious decline, reduces 73.6% and 87.2% respectively.
The embodiment of the above, only presently preferred embodiments of the present invention, is only used to explain the present invention, not limit
The scope of the present invention processed to those of ordinary skill in the art certainly can be according to skill disclosed in this specification
Art content makes other embodiments easily by way of replacing or changing, therefore all made in the principle of the present invention
Changes and improvements etc., should be included in scope of the present invention patent.
Claims (7)
1. a kind of processing method of acidity electroplating wastewater of chromium, which comprises the following steps:
Step A: hydrazine hydrate dilution is added drop-wise in acid electroplating wastewater of chromium, adjust its pH value be 7.9~8.8, then after
Continuous stirring, obtains mixed solution；The percent by volume of the hydrazine hydrate dilution is the 4~6% of acid electroplating wastewater of chromium；
Step B: to mixed solution and dripping composite iron salt solution, and continue to stir；The volume basis of the composite iron salt solution
Than 4~8% for acid electroplating wastewater of chromium；
Step C: polyacrylamide solution is added into mixed solution again and carries out flocculation sedimentation, continues to stir, then carries out solid-liquid
Separation, treated, and liquid is recycled；The percent by volume of the poly- propionyl amine aqueous solution is acid electroplating wastewater of chromium
0.1~0.3%.
2. a kind of processing method of acid electroplating wastewater of chromium according to claim 1, which is characterized in that in the step A
Hydrazine hydrate dilution is technical grade hydrazine hydrate and water according to the mixed diluting liquid that volume ratio is 1:2~6, the technical grade hydrazine hydrate
Content >=80%.
3. a kind of processing method of acid electroplating wastewater of chromium according to claim 1, which is characterized in that in the step B
Composite iron salt solution be the solution that is mixed according to the ratio of 10g:80~110mL of composite iron salt and water, the compound iron
Salt is made of the ferrous sulfate that mass ratio is 8~6:2~4 and bodied ferric sulfate.
4. a kind of processing method of acid electroplating wastewater of chromium according to claim 1, which is characterized in that in the step C
Polyacrylamide solution be to be formulated by solid polypropylene amide and water according to the ratio of 0.1~0.5g:100mL.
5. a kind of processing method of acid electroplating wastewater of chromium according to claim 1, which is characterized in that in the step A
Stirring be 10~20min.
6. a kind of processing method of acid electroplating wastewater of chromium according to claim 1, which is characterized in that in the step B
Stirring be 2~8min.
7. a kind of processing method of acid electroplating wastewater of chromium according to claim 1, which is characterized in that in the step C
Stirring is 2~5min.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111186940A (en) * | 2020-01-19 | 2020-05-22 | 西安瑞联新材料股份有限公司 | Industrial treatment method of high-valence chromium wastewater |
| CN111646598A (en) * | 2020-06-16 | 2020-09-11 | 华辰环保能源(广州)有限责任公司 | Method for co-processing chromium-containing electroplating waste liquid and electroplating cleaning water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111186940A (en) * | 2020-01-19 | 2020-05-22 | 西安瑞联新材料股份有限公司 | Industrial treatment method of high-valence chromium wastewater |
| CN111646598A (en) * | 2020-06-16 | 2020-09-11 | 华辰环保能源(广州)有限责任公司 | Method for co-processing chromium-containing electroplating waste liquid and electroplating cleaning water |
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