CN101274806B - Novel process for reclaiming waste water containing CN- and NH3 or NH4- - Google Patents
Novel process for reclaiming waste water containing CN- and NH3 or NH4- Download PDFInfo
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- CN101274806B CN101274806B CN2007100649549A CN200710064954A CN101274806B CN 101274806 B CN101274806 B CN 101274806B CN 2007100649549 A CN2007100649549 A CN 2007100649549A CN 200710064954 A CN200710064954 A CN 200710064954A CN 101274806 B CN101274806 B CN 101274806B
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Abstract
The invention relates to a method for separating HCN and NH3 for reclamation or realizing standardized discharge from wastewater solution that contains CN<-> and NH3 or NH4<+>, particularly relates to a new technique of resource cyclic utilization of high-salt cyanide and ammonium bearing wastewater, which is represented by cyanuric chloride industry, thus opening a new way of resource cyclic utilization of the high-salt cyanide and ammonium bearing wastewater, which is represented by cyanuric chloride, and providing a totally new clean production technology with simple technique, investment-saving and low operation fee and resource cyclic used feature of the integrated utilization of wastewater that contains the CN<-> and NH3 or NH4<+>.
Description
Technical field
The present invention relates to a kind of from containing CN
-And contain NH
3Or NH
4 +Separation and Recovery HCN and NH in the waste water solution
3The method of back reuse or qualified discharge, particularly relating to the cyanuric chloride industry is that the high salt of representative contains CN
-And contain NH
3Or NH
4 +The resource utilization recycle novel method of waste water.
Background technology
Through nearly 20 years development, the cyanuric chloride industry of China begins to take shape, and has formed the throughput of ten thousand tons/year of 6-8.But owing to all adopt traditional sodium cyanide method production, have that technical process is long, material consumption is high, and produce the problem of the high density chlorination sodium waste water that contains impurity such as ammonium, cyanogen, sodium formiate in a large number.Owing to contain the sodium-chlor of high density, use this waste water difficulty of biological degradation art breading bigger, other chemical physics method is also difficult removes wherein contained ammonium, cyanogen and sodium formiate etc. simultaneously.Thereby the complicacy and the processing cost of wastewater treatment have been increased.The precedent that the Technology and the method for such utilization of wastewater resource also do not had success at present.Therefore, the clearer production technology of exploitation cyanuric chloride and the industrial technology of waste water reclaiming recycle have great importance.
The production of cyanuric chloride is to be raw material with sodium cyanide and chlorine, and synthetic chlorine cyanogen makes cyanuric chloride through the gas phase catalysis polymerization again, and a large amount of simultaneously the generation contained the ammonia that sodium-chlor, free cyanogen and cyanogen hydrolysis produce and the waste water of sodium formiate.
Therefore, the sodium chloride-containing waste water that chlorination workshop section if can be produced is refining cheaply for electrolytic saltwater, not only can realize the resource circulation utilization, and can effectively reduce production costs to have good economy and environmental benefit.
At present, can be used for that cyanide wastewater separates and the Technology that reclaims mainly contains gas formulation, membrane separation process, solvent extration and ion exchange method.Traditional gas formulation is to utilize air under acidic conditions
Running cost is very high.Ion exchange method reduced investment, technology are simple, operation is also comparatively convenient, yet regeneration of resin is met difficulty, if with ammonia stripping regeneration then enter atmosphere and cause secondary pollution, if water absorb weak ammonia that ammonia that stripping goes out obtains generally all can not reuse, do not have export value yet.
In sum, for containing CN
-And NH
3Or NH
4 +Waste water, existing single treatment technology individual curing all exists various deficiencies, or can only the single CN that must handle in the waste water
-Or NH
3/ NH
4 +, or the chemical reagent consumption is big, the energy consumption height.The contriver explores through a large amount of tests, has invented the CN that contains that a kind of energy consumption is low, the chemical reagent consumption is few
-And contain NH
3Or NH
4 +The novel process for recycling of waste water can not only be with the CN in the waste water
-And NH
3Efficient recovery, and can also to make with the cyanuric chloride be that the sodium chloride brine that is produced in the production process of representative reaches electrolysis salt solution standard, characteristics economic, efficient, environmental protection that resource circulation utilization, whole waste water treatment process have embodied.
Summary of the invention
The present invention relates to a kind of from containing CN
-And contain NH
3Or NH
4 +Separation and Recovery HCN and NH in the waste water solution
3The method of back reuse or qualified discharge, this method may further comprise the steps:
1), the acid waste water in the decyanation tower or adjusted pH value to tart waste water bubbling air stripping go out HCN, reclaimed after absorbing with alkali lye (as sodium hydroxide solution), the waste water after the decyanation is put into deammoniation tower;
2), the waste water after the decyanation is added alkali (as sodium hydroxide, calcium oxide) and adjust waste water ph to alkaline range; The bubbling air stripping goes out NH in deammoniation tower
3, produce ammonium salt with acid (as sulfuric acid, phosphoric acid, acetic acid) absorption and reclaimed, will put into comprehensive stills for air blowing after the decyanation deamination waste water filtering disgorging matter;
3), in comprehensive stills for air blowing, add the oxygenant (as clorox, chlorine, ozone, hydrogen peroxide) of waste water weight 0.1-2% behind the stripping in the solution of residual minim cyanogen and ammonia, the oxidation after-filtration promptly gets satisfactory solution.
Description of drawings
Fig. 1 be the present invention a kind of from waste water separation of C N
-And NH
3And the technical process of purification solution and equipment synoptic diagram.Further specify the solution of the present invention and effect below in conjunction with accompanying drawing.
Step 1) waste water is from containing CN in-And contain NH3Or NH4 +Waste water, Cyanuric Chloride manufacture waste water for example, this waste water can contain metal cation such as H after active metal, transition metal and the transition+、Li
+、Na
+、K
+、Ca
2+、Mg
2+、Au
+、Cu
2+、Al
3+Deng and anion such as Cl-、SO
4 2-、SO
3 2-、PO
4 3-、S
2-、CO
3 2-、HCOO
-、CN
-Deng one or more the aqueous solution of arbitrary composition.
Being operating as step 1): (the pH value of waste water is less than 7 to acid waste water for the acid waste water in the decyanation tower or modulated whole pH value, be preferably 2～6) pass into air stripping and go out HCN, send in the decyanation tower, pass into the stripping air, gas liquid ratio is 150～500: 1 (m3/m
3), be preferably 200～400: 1 (m3/m
3). The air of carrying HCN secretly that stripping goes out is used after suction cyanogen tower is with alkali liquor absorption and is returned the decyanation tower. When Cyanide in Waste Water residual volume during less than 40mg/L, waste water is put into deammoniation tower.
Being operating as step 2): pH value of waste water in the deammoniation tower is adjusted into 10～13, is preferably 11～12; Pass into air and carry out stripping, gas liquid ratio is 500～1000: 1 (m3/m
3), be preferably 600～900: 1 (m3/m
3). Carry NH behind the stripping secretly3Air absorb with acid after retrieval system carry out stripping, when ammonia residual volume in the waste water less than 100mg/L the time, waste water is put into comprehensive stills for air blowing.
Being operating as step 3): add a small amount of oxidant (such as clorox, chlorine, ozone, hydrogen peroxide) in comprehensive stills for air blowing, for example the oxidant of waste water weight 0.1-2% is preferably 0.5-1.5%, the CN of oxidation removal remnants-And NH3Or NH4 +With other reducing substanceses that may exist, the solid matter that removes by filter generation gets final product to get satisfactory solution.
With step 1) the cyanogen residual volume of decyanation waste water is controlled at less than 40mg/L; With with step 2) the ammonia residual volume of deamination waste water is controlled at less than 100mg/L to be favourable to the enforcement of the inventive method, can to alleviate like this oxidation burden in the comprehensive stills for air blowing. Yet cyanogen residual volume and ammonia residual volume are a little excessive equally also to be acceptable, just step 3) need to add slightly a large amount of oxidants. The addition of oxidant depends on CN in the waste water usually-And NH3Or NH4 +Residual quantity, it can be according to CN in the waste water-And NH3Or NH4 +Residual quantity adjust in right amount.
Used decyanation tower, deammoniation tower can be interior circulation type tower among the present invention, also can be packing tower, or its combination, circulation type tower in being preferably.
Proposed by the invention a kind of from the aqueous solution separation of C N
-And NH
3And the novel process of purification solution, be the CN of Separation and Recovery more than 93% under acidic conditions and under alkaline condition respectively
-And NH
3, make CN in the waste water
-Concentration is less than 40mg/L, NH
3Concentration is less than 100mg/L, the remaining CN of comprehensive then oxide treatment
-, NH
3With other reducing substanceses.With the existing CN that contains
-, NH
3Wastewater processing technology is compared, and has not only solved the blow-off method processing and has contained the cyanogen ammonia-containing water at CN
-, NH
3Energy consumption height, processing cost were higher than the problem of recovery value when concentration was low; Also solved alkaline chlorination process Treatment of Cyanide-containing Wastewater and break point chlorination Ammonia-Containing Wastewater Treatment handle the chemical reagent consumption that produces big, the problem that processing cost is high, and because the employing gas-liquid distributes, the stripping tower such as the interior ring type stripping tower of full contact carry out stripping, the vapour-liquid ratio that makes traditional blow-off method Treatment of Cyanide-containing Wastewater is by 600～900: 1 (m
3/ m
3) significantly reduce to 200～400: 1 (m
3/ m
3); The vapour-liquid ratio of stripping ammonia is by 3000～4000: 1 traditional (m
3/ m
3) reduce to 600～900: 1 (m
3/ m
3), simultaneously because the minimizing of gas usage makes the CN that stripping comes out
-And NH
3The absorption organic efficiency improve.Make whole waste water treatment process economy, effectively and reasonably.The inventive method chemical reagent consumption amount is few, facility investment and process cost is low, the entire treatment process does not have the new three wastes and produces.
Embodiment
Below by indefiniteness embodiment the inventive method is done and to be specified.
Embodiment 1
By flow process shown in Figure 1, the high salt that the cyanuric chloride production process is produced contains cyanogen and contains ammonium and contain sodium formiate waste water and (contain CN
-: 800mg/L, NH
4 +-N:1200mg/L, NaCl:200000mg/L, HCOONa:1200mg/L, waste water pH:8.0) is sent into the decyanation tower, and adding the hydrochloric acid adjust pH is 2.0, and feeding vapour-liquid ratio is 250: 1 (m
3/ m
3) air carry out stripping, the air of carrying HCN secretly behind the stripping returns the decyanation tower after sodium hydroxide solution absorbs HCN.800mg/L when the concentration of cyanogen was by beginning in the waste water after stripping finished drops to 20mg/L, and its stripping rate is 97.5%, and the cyanogen total amount is 7640mg in the absorption tower, and specific absorption is 97.4%.
The waste water hydro-oxidation sodium adjust pH that comes out from the decyanation tower is 11.5, sends into deammoniation tower, and feeding vapour-liquid ratio is 900: 1 (m
3/ m
3) air carry out stripping, carry NH secretly behind the stripping
3Air through sulfuric acid absorption NH
3After return deammoniation tower.1200mg/L when the concentration of ammonia was by beginning in the waste water after stripping finished drops to 60mg/L, and its stripping rate is 95%, and the ammonia total amount is 11200mg in the absorption tower, and specific absorption is 98.2%.
Waste water behind the decyanation deamination is sent into comprehensive stills for air blowing, add the chlorine bleach liquor of waste water weight 0.6%, feed pressurized air and stir, behind the catalytic oxidation 30min, transferring pH is 6～7, continues at 60 ℃ of oxide treatment 6h, the salt solution cyanogen content that filtration obtains is less than 0.01mg/L, NH
3Content is less than 1mg/L, and TOC has reached the standard of electrolysis with table salt water less than 5mg/L, can return chlor-alkali production.
Embodiment 2
By flow process shown in Figure 2, the high salt that the cyanuric chloride production process is produced contains cyanogen and contains ammonium and contain sodium formiate waste water and (contain CN
-: 800mg/L, NH
4 +-N:1200mg/L, NaCl:200000mg/L, HCOONa:1200mg/L, waste water pH:8.0) is sent into the decyanation tower, and adding the hydrochloric acid adjust pH is 6.0, and feeding vapour-liquid ratio is 250: 1 (m
3/ m
3) air carry out stripping, the air of carrying HCN secretly behind the stripping returns the decyanation tower after sodium hydroxide solution absorbs HCN.800mg/L when the concentration of cyanogen was by beginning in the waste water after stripping finished drops to 40mg/L, and its stripping rate is 95%, and the cyanogen total amount is 7334mg in the absorption tower, and specific absorption is 96.5%.
The waste water hydro-oxidation sodium adjust pH that comes out from the decyanation tower is 10.5, sends into deammoniation tower, and feeding vapour-liquid ratio is 900: 1 (m
3/ m
3) air carry out stripping, carry NH secretly behind the stripping
3Air through sulfuric acid absorption NH
3After return deammoniation tower.1200mg/L when the concentration of ammonia was by beginning in the waste water after stripping finished drops to 80mg/L, and its stripping rate is 93.3%, and the ammonia total amount is 10976mg in the absorption tower, and specific absorption is 98.0%.
Waste water behind the decyanation deamination is sent into comprehensive stills for air blowing, feed salt solution cyanogen content that the ozone Oxidation Treatment after-filtration of waste water weight 0.1% obtains less than 0.01mg/L, NH
3Content is less than 1mg/L, and TOC has reached the standard of electrolysis with table salt water less than 3mg/L, returns chlor-alkali production.
Embodiment 3
By flow process shown in Figure 1, will contain CN
-: 800mg/L, CaCl
2: 20000mg/L, NH
4Cl:8000mg/L, the waste water of pH:3.0 is sent into the decyanation tower, and feeding vapour-liquid ratio is 200: 1 (m
3/ m
3) air carry out stripping, the air of carrying HCN secretly behind the stripping returns the decyanation tower after potassium hydroxide solution absorbs HCN.800mg/L when the concentration of cyanogen was by beginning in the waste water after stripping finished drops to 10mg/L, and its stripping rate is 98.8%, and the cyanogen total amount is 7750mg in the absorption tower, and specific absorption is 98.1%.
The waste water adding calcium hydroxide adjust pH that comes out from the decyanation tower is 11.5, sends into deammoniation tower, and feeding vapour-liquid ratio is 1000: 1 (m
3/ m
3) air carry out stripping, carry NH secretly behind the stripping
3Air through acetic acid absorption of N H
3After return deammoniation tower.2690mg/L when the concentration of ammonia was by beginning in the waste water after stripping finished drops to 100mg/L, and its stripping rate is 96.2%, and the ammonia total amount is 2486mg in the absorption tower, and specific absorption is 96%.
To send into comprehensive stills for air blowing behind the waste water filtering disgorging behind the decyanation deamination, promptly obtain purified calcium chloride solution after the aqueous hydrogen peroxide solution oxide treatment of adding waste water weight 1%, return to produce and use.
Embodiment 4
By flow process shown in Figure 1, will contain CN
-Be 900mg/L, NH
4 +-N:600mg/L and contain metal ions such as gold and silver, copper, zinc, lead and they and CN
-The waste water of complex compound send into the decyanation tower, adding the sulfuric acid adjust pH is 2, feeding vapour-liquid ratio is 500: 1 (m
3/ m
3) air carry out stripping, the air of carrying HCN secretly behind the stripping returns the decyanation tower after potassium hydroxide absorbs HCN.900mg/L when the concentration of cyanogen was by beginning in the waste water after stripping finished drops to 30mg/L, and its stripping rate is 96.7%, and the cyanogen total amount is 829mg in the absorption tower, and specific absorption is 95.3%.
Throw out back end hydrogenation calcium oxide or the calcium oxide adjust pH of above-mentioned decyanation waste water filtering being removed generation are 11, send into deammoniation tower, and feeding vapour-liquid ratio is 600: 1 (m
3/ m
3) air carry out stripping, carry NH secretly behind the stripping
3Air through nitric acid absorption of N H
3After return deammoniation tower.600mg/L when the concentration of ammonia was by beginning in the waste water after stripping finished drops to 40mg/L, and its stripping rate is 93.3%, and the ammonia total amount is 5499.2mg in the absorption tower, and specific absorption is 98.2%.
Send into comprehensive stills for air blowing after the waste water behind the decyanation deamination removes by filter throw out once more, add the aqueous hydrogen peroxide solution of waste water weight 1.5%, oxidation removes the throw out that deoxidation produces, and it is colourless to handle the back clarification of water, its CN
-, metal ion, NH
4 +Or NH
3, COD all reached emission standard.
Claims (8)
1. one kind from containing CN
-And contain NH
3Or NH
4 +Separation and Recovery HCN and NH in the waste water solution
3The method of back reuse or qualified discharge, this method may further comprise the steps:
1), the acid waste water in the decyanation tower or adjusted pH value to tart waste water bubbling air stripping go out HCN, reclaimed after absorbing with alkali lye, the waste water after the decyanation is put into deammoniation tower;
2), the waste water after the decyanation is added alkali and adjust waste water ph to alkaline range; The bubbling air stripping goes out NH in deammoniation tower
3, produce ammonium salt with the acid absorption, waste water is put into comprehensive stills for air blowing behind the deamination;
3), residual minim CN behind the stripping in comprehensive stills for air blowing
-And NH
3Or NH
4 +Solution in add oxygenant, oxidation removes by filter throw out and promptly gets satisfactory solution.
2. in accordance with the method for claim 1, it is characterized in that the alkali lye in the step 1) is aqueous sodium hydroxide solution; Step 2) alkali in is selected from sodium hydroxide and/or calcium oxide, and acid is selected from sulfuric acid, phosphoric acid or acetic acid; The oxygenant of step 3) is selected from one or more in clorox, chlorine, ozone and the hydrogen peroxide.
3. according to claim 1 or 2 described methods, the pH value that it is characterized in that waste water in the described step 1) is less than 7, and feeding stripping air vapour-liquid ratio is 150～500: 1 (m
3/ m
3).
4. according to claim 1 or 2 described methods, it is characterized in that described step 2) in to adjust wastewater pH be 10～13; The bubbling air vapour-liquid ratio is 500～1000: 1 (m
3/ m
3).
5. according to claim 1 or 2 described methods, it is characterized in that in step 1) less than 40mg/L the time, waste water being put into deammoniation tower when cyanogen residual volume in the waste water; In step 2) in when ammonia residual volume in the waste water less than 100mg/L the time, waste water is put into comprehensive stills for air blowing.
6. according to claim 1 or 2 described methods, it is characterized in that adding in the described step 3) oxygenant of waste water weight 0.1-2%, the CN of oxide treatment remnants
-And NH
3Or NH
4 +With other reducing substances that may exist, make it to reach reuse or emission standard.
7. according to claim 1 or 2 described methods, it is characterized in that decyanation tower, deammoniation tower are interior circulation type towers, also can be packing tower, or its combination.
8. according to claim 1 or 2 described methods, its described waste water is cyanuric chloride manufacture waste water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100649549A CN101274806B (en) | 2007-03-30 | 2007-03-30 | Novel process for reclaiming waste water containing CN- and NH3 or NH4- |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100649549A CN101274806B (en) | 2007-03-30 | 2007-03-30 | Novel process for reclaiming waste water containing CN- and NH3 or NH4- |
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| Publication Number | Publication Date |
|---|---|
| CN101274806A CN101274806A (en) | 2008-10-01 |
| CN101274806B true CN101274806B (en) | 2010-09-29 |
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|---|---|---|---|
| CN2007100649549A Active CN101274806B (en) | 2007-03-30 | 2007-03-30 | Novel process for reclaiming waste water containing CN- and NH3 or NH4- |
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| CN102120629B (en) * | 2011-03-23 | 2013-01-02 | 山东新华制药股份有限公司 | Method for treating cyanide-containing waste water with air stripping method |
| CN102241422B (en) * | 2011-04-22 | 2013-03-13 | 杭州恒易环保科技有限公司 | Circulating closed ammonia nitrogen stripping system |
| CN102517609B (en) * | 2012-01-13 | 2015-01-07 | 株洲三特环保节能股份有限公司 | Method and equipment for removing fluorine and chlorine from zinc electrolyte |
| CN103318918B (en) * | 2013-05-14 | 2016-01-13 | 武汉百富环保工程有限公司 | A kind of method of purifying and recovering ammonia gas |
| CN103395924A (en) * | 2013-06-08 | 2013-11-20 | 营创三征(营口)精细化工有限公司 | Method for reuse of cyanuric chloride analytic kettle wastewater in production of chlor-alkali by ion membrane process |
| AU2016268593A1 (en) * | 2015-05-22 | 2017-12-21 | Katayama Chemical, Inc. | Method for treating cyanogen-containing wastewater |
| CN106431830B (en) * | 2016-08-11 | 2020-03-31 | 刘定忠 | Method and apparatus for decomposing tetramethylammonium hydroxide solution |
| CN106219853A (en) * | 2016-08-31 | 2016-12-14 | 河北诚信有限责任公司 | The continuous treatment process of cyanide wastewater |
| CN106629878A (en) * | 2016-10-20 | 2017-05-10 | 安庆市长虹化工有限公司 | High-cyanide-content wastewater treatment system and treatment method |
| CN107176760A (en) * | 2017-06-26 | 2017-09-19 | 中电环保股份有限公司 | A kind of high salt advance for the treatment of process of cyanide-bearing effluent and processing system |
| CN109650568A (en) * | 2017-10-10 | 2019-04-19 | 江苏苏盐井神股份有限公司 | The sudden and violent qi exhaustion ammonia system of one kind vacuum of waste liquid containing ammonia and method |
| CN109626652A (en) * | 2019-01-16 | 2019-04-16 | 黄婷静 | A kind of Integrated Processing Unit for Chemical Manufacture waste material |
| CN109824199B (en) * | 2019-03-22 | 2021-08-17 | 盛隆资源再生（无锡）有限公司 | Method for treating high COD (chemical oxygen demand) membrane production wastewater containing sodium hypochlorite and PVP (polyvinyl pyrrolidone) |
| CN115093047B (en) * | 2022-06-21 | 2024-01-09 | 河北诚信集团有限公司 | Treatment method of byproduct high-salt wastewater |
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|---|---|
| CN101274806A (en) | 2008-10-01 |
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Address after: 100085 Haidian District, Anning Zhuang Road, No. 18, Beijing Co-patentee after: Evonik Sanzheng (Yingkou) Fine Chemical Co., Ltd. Patentee after: TH-UNIS Insight Co., Ltd. Address before: 100085 Haidian District, Anning Zhuang Road, No. 18, Beijing Co-patentee before: Degusai Sanzheng (Yingkou) Fine Chemical Co., Ltd. Patentee before: Beijing Tsinghua Unisplendour Insight Chemical Technology LLC |
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| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: 100085 No. 10, No. 18, Anning Zhuang Road, Haidian District, Beijing Co-patentee after: Yingchuang Sanzheng (Yingkou) Fine Chemical Co., Ltd. Patentee after: TH-UNIS Insight Co., Ltd. Address before: No. 18, Anning Zhuang Road, Haidian District, Beijing, Beijing Co-patentee before: Evonik Sanzheng (Yingkou) Fine Chemical Co., Ltd. Patentee before: TH-UNIS Insight Co., Ltd. |