CN1488588A - Cyanogen-containing waste water treating method and treating system thereof - Google Patents
Cyanogen-containing waste water treating method and treating system thereof Download PDFInfo
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- CN1488588A CN1488588A CNA031323308A CN03132330A CN1488588A CN 1488588 A CN1488588 A CN 1488588A CN A031323308 A CNA031323308 A CN A031323308A CN 03132330 A CN03132330 A CN 03132330A CN 1488588 A CN1488588 A CN 1488588A
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Abstract
The invention refers to a treatment method and the system for dicyan-contained waster water. The invention adds in acid to solution containing formonitrile group ion and adjusts the pH value and makes the formonitrile group ion changed into formonitrile. It uses air blow method to transfer the cyanide from water phase into gas phase, and treats the hot charcoal with blew air. The invention reduces the air treatment quantity, and reduces the cost.
Description
Technical Field
The invention relates to a method for treating wastewater, in particular to a method for treating cyanide-containing wastewater and a treatment system thereof.
Background
At present, para-Cyanogen (CN)-) The waste water treating process mainly adopts oxidation process, such as sodium hypochlorite oxidation process, chlorine dioxide oxidation process, etc. Although the used oxidants are different, the various oxidation processes for treating cyanide-containing wastewater have a common characteristic: make Cyanide (CN)-) Oxidized and further oxidized to carbon dioxide and nitrogen. A common process for transferring contaminants in the aqueous phase to the gas phase is air stripping, such as treating ammonia in water. But instead of the other end of the tubeThe common air stripping process has no way of treating the waste gas containing pollutants up to the standard because of large air consumption, and can only dilute the waste gas up to the standard by utilizing the characteristic of large air quantity. The treatment is essentially to transfer the pollutants discharged from the water phase into the gas phase for dilution and diffusion, and does not reduce the absolute amount of the discharged pollutants.
Disclosure of Invention
The invention aims to provide a method for treating cyanide-containing wastewater, which converts hydrocyanic acid in a water phase into a gas phase by using a gas stripping method and then uses hot coke to crack the hydrocyanic acid.
Another object of the present invention is to provide a set of cyanide-containing wastewater treatment system.
The invention is realized by adopting the following method: adding acid into the solution containing hydrocyanic acid to adjust pH to 8-6 to convert hydrocyanic acid salt into hydrocyanic acid, and addingAir circulation stripping, cyanide in the water phase is transferred to the gas phase, and when the hydrocyanic acid concentration in the circulating air reaches 10mg/m3----1000mg/m3During the process, the cyanide-containing air after stripping is treated by cracking hydrocyanic acid by hot coke carbon, and the hydrocyanic acid in a gas phase is oxidized into water, carbon dioxide and nitrogen. The chemical reaction process comprises the following steps:
aqueous phase
Gas phase
The system for treating cyanide-containing wastewater comprises a stripping tower, a fan and a cracking furnace, wherein the fan sucks air from an air inlet, compresses the air and then adds the air into the stripping tower storing the cyanide-containing wastewater, and hydrocyanic acid stripped by the stripping tower enters the cracking furnace for hot coke cracking treatment. Wherein the pH value in the stripping tower is 8-6, the gas-water ratio is 20-4: 1, the height of a carbon layer in the cracking furnace is 20-50cm, and the temperature is 200-600 ℃.
The system for treating the wastewater preferably comprises a wastewater storage tank, a stripping tower II, a water pump, an air storage tank I, II and a fan; after the fan sucks compressed air, adding the air into an air stripping tower II to strip hydrocyanic acid, introducing return air of the air stripping tower II into an air storage tank II, and sucking air by the fan in the air storage tank II and an air inlet to complete an air cycle; after the air is sucked in the air storage tank II, the compressed air is added into the stripping tower I to strip hydrocyanic acid, and the return air of the stripping tower I enters the air storage tank I; the fan draws air between air reservoir II and air reservoir I to complete another air cycle. Wherein the pH value in the stripping tower II is 7-6, and the ratio of gas to water is 20-4:1.
The invention has the advantages that the defect that the pollutant which is intensively discharged from the water phase is only diluted and diffused when being transferred into the gas phase at present and the discharge amount of the pollutant is not really reduced is overcome, and the method for cracking the cyanogen-containing air after stripping by adopting the hot coke makes the treatment more thorough; in addition, the method of the air storage tank is adopted to recycle the blow-off air, so that the subsequent waste gas treatment capacity is reduced, and the investment cost is reduced.
Drawings
FIG. 1 is a schematic view of the working process of the cyanide-containing wastewater treatment system of the present invention
FIG. 2 is another flow chart of the cyanide-containing wastewater treatment system of the present invention, wherein a stripping tower I-1 blower-2 cracking furnace-3 wastewater storage tank-4 stripping tower II-5 water pump-6 gas storage tank I, II-7\9 blower-8
Detailed Description
The first embodiment is as follows:
the discharge amount of cyanide-containing waste water produced by a certain electroplating plant is 2 tons/day, and the concentration of cyanide is 100 mg/l. The factory adopts a system of mutually connecting a blow-off tower I-1, a fan-2, a cracking furnace-3, a waste water storage tank-4 and a water pump-6 to treat waste water, firstly, the cyanide-containing waste water is lifted from the waste water storage tank-4 to the blow-off tower I-1 by the water pump-6, the air sucked by the fan-2 enters the blow-off tower 1-1 after being compressed, andthe cyanide-containing air discharged from the blow-off tower I-1 enters the cracking furnace-3 to be treated by hot coke. The treatment cost of the plant is 1.5 yuan/ton water once every 10 days, and the total investment is only 8 ten thousand yuan.
Example two:
the discharge amount of cyanide-containing waste water generated in the coal gas production section of a certain fertilizer plant is 8000 tons/day, and the concentration of cyanide is 40-50 mg/l. The factory adopts a system of mutually connecting an air stripping tower I-1 fan, a cracking furnace-2, a wastewater storage tank-3, a blowing tower II-5 water pump-6 air storage tank I, II-7\9 fan-8 to treat wastewater, the fan-8 is added into the blowing tower II-5 to blow off hydrocyanic acid after sucking compressed air, return air of the blowing tower II-5 enters an air storage tank II-9, and the fan-8 sucks air in the air storage tank II-9 and an air inlet to complete air circulation; after the air is sucked in the air storage tank II-9, the fan-2 adds compressed air into the stripping tower I-1 to strip hydrocyanic acid, and return air of the stripping tower I-1 enters the air storage tank I-7; the fan-2 sucks air between the air storage tank II-9 and the air storage tank I-7 simultaneously to complete another air circulation. When the treatment system finishes the first air circulation, the cyanogen content in the air is possibly low, if the air is directly discharged and treated, the air discharge amount is large, and the treatment difficulty and the investment cost are increased; for this reason, after the first air cycle is completed, the system is circulated again; after multiple circulation, the cyanogen concentration in the air reaches a certain value, and the re-discharge treatment reduces the air treatment capacity and the investment cost.
The fertilizer plant adopts the system to treat the wastewater, the treatment cost is only 1.2 yuan per ton of water, and the investment is only 150 ten thousand yuan.
Claims (5)
1. A process for treating the cyanide-containing waste water includes such steps as adding acid to the solution containing hydrocyanic acid to regulate pH value to 8-6, converting the ions of hydrocyanic acid to hydrocyanic acid, air circulation stripping, transferring the cyanide in water phase to gas phase, and treating the air containing cyanogen by thermal coke cracking.
2. A system for treating cyanide-containing wastewater according to the method of claim 1, which comprises a stripping tower, a blower and a cracking furnace, wherein the blower sucks air from an air inlet, compresses the air, then adds the air into the stripping tower storing the cyanide-containing wastewater, and then feeds hydrocyanic acid stripped by the stripping tower into the cracking furnace for thermal coke cracking treatment.
3. The system for treating cyanide-containing wastewater according to claim 2, wherein the pH in the stripping tower is 8-6 and the ratio of gas to water is 20-4: 1; the height of the carbon layer in the cracking furnace is 20-50cm, and the temperature is 200-600 ℃.
4. The system for treating cyanide-containing wastewater according to claim 2, further comprising a wastewater storage tank, a blow-off tower, a water pump, an air storage tank I, II, a blower; after the fan sucks compressed air, the compressed air is added into an air stripping tower to strip hydrocyanic acid, return air of the air stripping tower enters an air storage tank II, and the fan sucks air in the air storage tank II and an air inlet to complete air circulation; after the air is sucked in the air storage tank II, the compressed air is added into the stripping tower to strip hydrocyanic acid, and the return air of the stripping tower enters the air storage tank I; the fan simultaneously inhales between the air storage tank II and the air storage tank I to complete another air cycle.
5. The system for treating cyanide-containing wastewater according to claim 4, wherein the pH value in the stripping tower 5 is 7-6, and the ratio of gas to water is 20-4: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132330 CN1283568C (en) | 2003-08-15 | 2003-08-15 | Cyanogen-containing waste water treating method and treating system thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03132330 CN1283568C (en) | 2003-08-15 | 2003-08-15 | Cyanogen-containing waste water treating method and treating system thereof |
Publications (2)
| Publication Number | Publication Date |
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| CN1488588A true CN1488588A (en) | 2004-04-14 |
| CN1283568C CN1283568C (en) | 2006-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 03132330 Expired - Fee Related CN1283568C (en) | 2003-08-15 | 2003-08-15 | Cyanogen-containing waste water treating method and treating system thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101781010A (en) * | 2010-03-17 | 2010-07-21 | 湖南国发精细化工科技有限公司 | Novel treatment process for cyclic utilization of high-concentration sodium cyanide-containing waste water |
| CN106315944A (en) * | 2015-06-30 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Method for processing cyanogens-containing waste water from gold mine |
| CN108314218A (en) * | 2018-03-12 | 2018-07-24 | 广东新大禹环境科技股份有限公司 | A kind of processing method of electroplating cyanic waste water |
-
2003
- 2003-08-15 CN CN 03132330 patent/CN1283568C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101781010A (en) * | 2010-03-17 | 2010-07-21 | 湖南国发精细化工科技有限公司 | Novel treatment process for cyclic utilization of high-concentration sodium cyanide-containing waste water |
| CN106315944A (en) * | 2015-06-30 | 2017-01-11 | 铜仁市万山区盛和矿业有限责任公司 | Method for processing cyanogens-containing waste water from gold mine |
| CN108314218A (en) * | 2018-03-12 | 2018-07-24 | 广东新大禹环境科技股份有限公司 | A kind of processing method of electroplating cyanic waste water |
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| Publication number | Publication date |
|---|---|
| CN1283568C (en) | 2006-11-08 |
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