CN101549916A - Method for treating electroplating cyanide waste water - Google Patents
Method for treating electroplating cyanide waste water Download PDFInfo
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- CN101549916A CN101549916A CNA2008100602250A CN200810060225A CN101549916A CN 101549916 A CN101549916 A CN 101549916A CN A2008100602250 A CNA2008100602250 A CN A2008100602250A CN 200810060225 A CN200810060225 A CN 200810060225A CN 101549916 A CN101549916 A CN 101549916A
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Abstract
The invention relates to a method for treating electroplating cyanide waste water. Aiming at overcoming the defects of halfway oxidization of cyanide, low reaction speed and requirement of regulation of the pH in the waste water with acid and alkali of the prior alkaline sodium hypochlorite oxidization method, the invention provides a high-efficiency high-speed method for completely treating the electroplating cyanide waste water. The method comprises the following steps: (1) adding and stirring a sulfuric acid solution to cyanide waste water so as to ensure that an oxidation-reduction potential of the waste water is below 100; (2) adding an oxidizing agent under stirring for reaction of 15-30 minutes so as to ensure that the oxidation-reduction potential of the waste water reaches more than 2,000; and (3) enabling the waste water to flow into a neutralization pond for neutralization and neutralizing precipitates. In the process of treating the electroplating cyanide waste water, the cyanide in the cyanide waste water is oxidized into carbon dioxide and nitrogen, thereby eliminating the toxicity of the cyanide. In the method for treating the electroplating cyanide waste water, the used oxidizing agent can be potassium permanganate, perchloric acid and sodium persulfate.
Description
Technical field
The invention belongs to the technical field of Industrial Wastewater Treatment, particularly a kind of method for treating electroplating cyanide waste water.
Background technology
Up to now, the electroplating cyanide wastewater treatment is a long-standing problem always.The existing alkaline hypochlorite oxidation method of generally using exists serious problem, make cyanide oxidation not thoroughly, speed of response slow (wanting more than hour), want the PH of secondary with alkali and acid adjusting waste water.Main disease disease is that oxidizing potential is low, causes the wastewater treatment of numerous plating producer not up to standard.Once invest greatly and steam the recovery cyanide process with ion exchange method and acid, the operational administrative complexity is so fail to obtain to promote.
Summary of the invention
The present invention is directed to the weak point that the existing existing cyanide oxidation of alkaline hypochlorite oxidation method that generally uses is not thorough, speed of response is slow, want secondary to regulate the PH in the waste water with alkali and acid, provide a kind of efficient high-speed thoroughly to handle the method for treating electroplating cyanide waste water of cyanide wastewater.This method for treating electroplating cyanide waste water speed of response is fast, can be in 10～30 minutes thorough broken cyanide, contain cyanogen amount (CN in the secondary wastewater
-)＜0.5mg/l has avoided the complexing action of prussiate to metal ion, makes wastewater treatment up to standard.
The technical solution used in the present invention is finished in the following way: a kind of method for treating electroplating cyanide waste water, and it may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding oxygenant down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
In the electroplating cyanide wastewater treatment process, the prussiate in the cyanide wastewater is oxidized to carbonic acid gas and nitrogen, has eliminated the toxicity of prussiate.
After the electroplating cyanide wastewater treatment finishes, get after the above oxidation examination of wastewater its contain cyanogen amount or copper content, in the waste water contain the cyanogen amount or copper content is all answered＜0.5mg/l.
In above-mentioned method for treating electroplating cyanide waste water, the instrument that is used for detecting the redox potential in the cyanide wastewater is to adopt oxidation-reduction potentiometer, and this oxidation-reduction potentiometer can be used to indicate current potential and the dosing dosage in the waste water.
In above-mentioned method for treating electroplating cyanide waste water, employed oxygenant is potassium permanganate, perchloric acid, Sodium Persulfate.
In above-mentioned method for treating electroplating cyanide waste water, if adopt potassium permanganate as oxygenant, then the tartrate in the electroplating cyanide waste water, citric acid complexing agent also can be simultaneously oxidized, lose complexing action, make that heavy metal ion content is up to standard to be guaranteed; If adopt clorox as oxygenant, then the tartrate in the electroplating cyanide waste water, citric acid complexing agent can be not oxidized, are oxidized prussiate.
Method for treating electroplating cyanide waste water of the present invention is compared with existing plating cyanide wastewater alkalescence hypochlorite oxidation method, has following characteristics:
1, processing cost is low, and general needs 10 yuan/ton below the cyanide wastewater; And adopt existing plating cyanide wastewater alkalescence hypochlorite oxidation method only to need 15～20 yuan of/ton cyanide wastewaters, and also there is the halfway defective of processing;
2, speed of response is fast, and general oxygenant got final product as not considering oxidation hydroxyl complexing agent in 15 minutes;
3, processing ease, the level of automation height.
Adopt the present invention, not needing increases equipment in addition, utilizes original cyanide wastewater treatment facility to get final product.
Embodiment
Below in conjunction with embodiment a kind of method for treating electroplating cyanide waste water of the present invention is described further, but the present invention is not limited to these embodiment.
Embodiment 1
A kind of method for treating electroplating cyanide waste water, it may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding potassium permanganate down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
After the electroplating cyanide wastewater treatment finishes, get after the above oxidation examination of wastewater its contain the cyanogen amount, contain cyanogen amount＜0.5mg/l in the waste water.
In above-mentioned method for treating electroplating cyanide waste water, the instrument that is used for detecting the redox potential in the cyanide wastewater is to adopt oxidation-reduction potentiometer.
Embodiment 2
A kind of method for treating electroplating cyanide waste water, it may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding potassium permanganate down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
After the electroplating cyanide wastewater treatment finishes, get its copper content of examination of wastewater after the above oxidation, the copper content＜0.5mg/l in the waste water.
In above-mentioned method for treating electroplating cyanide waste water, the instrument that is used for detecting the redox potential in the cyanide wastewater is to adopt oxidation-reduction potentiometer.
Embodiment 3
A kind of method for treating electroplating cyanide waste water, it may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding perchloric acid down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
After the electroplating cyanide wastewater treatment finishes, get after the above oxidation examination of wastewater its contain the cyanogen amount, contain cyanogen amount＜0.5mg/l in the waste water.
In above-mentioned method for treating electroplating cyanide waste water, the instrument that is used for detecting the redox potential in the cyanide wastewater is to adopt oxidation-reduction potentiometer.
Embodiment 4
A kind of method for treating electroplating cyanide waste water, it may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding perchloric acid down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
After the electroplating cyanide wastewater treatment finishes, get its copper content of examination of wastewater after the above oxidation, the copper content＜0.5mg/l in the waste water.
In above-mentioned method for treating electroplating cyanide waste water, the instrument that is used for detecting the redox potential in the cyanide wastewater is to adopt oxidation-reduction potentiometer.
Embodiment 5
A kind of method for treating electroplating cyanide waste water, it may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding Sodium Persulfate down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
After the electroplating cyanide wastewater treatment finishes, get after the above oxidation examination of wastewater its contain the cyanogen amount, contain cyanogen amount＜0.5mg/l in the waste water.
In above-mentioned method for treating electroplating cyanide waste water, the instrument that is used for detecting the redox potential in the cyanide wastewater is to adopt oxidation-reduction potentiometer.
Embodiment 6
A kind of method for treating electroplating cyanide waste water, it may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding Sodium Persulfate down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
After the electroplating cyanide wastewater treatment finishes, get its copper content of examination of wastewater after the above oxidation, the copper content＜0.5mg/l in the waste water.
In above-mentioned method for treating electroplating cyanide waste water, the instrument that is used for detecting the redox potential in the cyanide wastewater is to adopt oxidation-reduction potentiometer.
Claims (5)
1, a kind of method for treating electroplating cyanide waste water is characterized in that this method for treating electroplating cyanide waste water may further comprise the steps:
(1) stirring adds sulphuric acid soln down in cyanide wastewater, and the redox potential of waste water is in below 100;
(2) stir adding oxygenant down, the redox potential of waste water is reached more than 2000, the reaction times is 15～30 minutes;
(3) waste water flows in the neutralization tank and neutralizes, and neutralization precipitation gets final product.
2, method for treating electroplating cyanide waste water according to claim 1, the instrument that it is characterized in that being used for detecting the redox potential in the cyanide wastewater are to adopt oxidation-reduction potentiometer.
3, method for treating electroplating cyanide waste water according to claim 1 and 2 is characterized in that employed oxygenant is a potassium permanganate.
4, method for treating electroplating cyanide waste water according to claim 1 and 2 is characterized in that employed oxygenant is a perchloric acid.
5, method for treating electroplating cyanide waste water according to claim 1 and 2 is characterized in that employed oxygenant is a Sodium Persulfate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100602250A CN101549916A (en) | 2008-03-31 | 2008-03-31 | Method for treating electroplating cyanide waste water |
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| CNA2008100602250A CN101549916A (en) | 2008-03-31 | 2008-03-31 | Method for treating electroplating cyanide waste water |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102531296A (en) * | 2012-02-14 | 2012-07-04 | 深圳市银台环保工程技术有限公司 | Comprehensive electroplating wastewater treatment method |
| CN102883783A (en) * | 2010-04-26 | 2013-01-16 | 三菱瓦斯化学株式会社 | Treatment agent for decomposition of chemical substance which comprises persulfuric acid salt and silver complex, and method for decomposition of chemical substance using same |
| RU2659056C1 (en) * | 2017-02-13 | 2018-06-27 | Федеральное государственное бюджетное учреждение науки Байкальский институт природопользования Сибирского отделения Российской академии наук (БИП СО РАН) | Method of treating sewage from stable nitriles |
| CN110980916A (en) * | 2019-11-14 | 2020-04-10 | 东北大学 | Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition |
| CN112062328A (en) * | 2020-08-25 | 2020-12-11 | 天津正达科技有限责任公司 | Method for rapidly treating cyanide-containing wastewater in blast furnace cooling |
| CN113233654A (en) * | 2021-06-28 | 2021-08-10 | 沈阳东泰环保产业有限公司 | Method for treating electroplating cyanide-containing wastewater |
| CN115028293A (en) * | 2022-07-19 | 2022-09-09 | 东北大学 | Method for treating cyanide-containing wastewater by using manganese dioxide in synergistic oxidation mode |
-
2008
- 2008-03-31 CN CNA2008100602250A patent/CN101549916A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102883783A (en) * | 2010-04-26 | 2013-01-16 | 三菱瓦斯化学株式会社 | Treatment agent for decomposition of chemical substance which comprises persulfuric acid salt and silver complex, and method for decomposition of chemical substance using same |
| CN102883783B (en) * | 2010-04-26 | 2016-01-13 | 三菱瓦斯化学株式会社 | Chemical substance degraded inorganic agent containing persulfate and silver complex and employ its biodegrading process of chemical substance |
| CN102531296A (en) * | 2012-02-14 | 2012-07-04 | 深圳市银台环保工程技术有限公司 | Comprehensive electroplating wastewater treatment method |
| CN102531296B (en) * | 2012-02-14 | 2014-03-12 | 深圳市银台环保工程技术有限公司 | Comprehensive electroplating wastewater treatment method |
| RU2659056C1 (en) * | 2017-02-13 | 2018-06-27 | Федеральное государственное бюджетное учреждение науки Байкальский институт природопользования Сибирского отделения Российской академии наук (БИП СО РАН) | Method of treating sewage from stable nitriles |
| CN110980916A (en) * | 2019-11-14 | 2020-04-10 | 东北大学 | Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition |
| CN110980916B (en) * | 2019-11-14 | 2021-03-26 | 东北大学 | Method for degrading thiocyanate in cyanogen-containing barren solution under acidic condition |
| CN112062328A (en) * | 2020-08-25 | 2020-12-11 | 天津正达科技有限责任公司 | Method for rapidly treating cyanide-containing wastewater in blast furnace cooling |
| CN112062328B (en) * | 2020-08-25 | 2022-09-09 | 天津正达科技有限责任公司 | Method for rapidly treating cyanide-containing wastewater in blast furnace cooling |
| CN113233654A (en) * | 2021-06-28 | 2021-08-10 | 沈阳东泰环保产业有限公司 | Method for treating electroplating cyanide-containing wastewater |
| CN115028293A (en) * | 2022-07-19 | 2022-09-09 | 东北大学 | Method for treating cyanide-containing wastewater by using manganese dioxide in synergistic oxidation mode |
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Application publication date: 20091007 |