CN102357355A - Preparation method of modified fly ash for treating ammonia nitrogen waste water - Google Patents
Preparation method of modified fly ash for treating ammonia nitrogen waste water Download PDFInfo
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- CN102357355A CN102357355A CN201110277856XA CN201110277856A CN102357355A CN 102357355 A CN102357355 A CN 102357355A CN 201110277856X A CN201110277856X A CN 201110277856XA CN 201110277856 A CN201110277856 A CN 201110277856A CN 102357355 A CN102357355 A CN 102357355A
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Abstract
The invention discloses a preparation method of modified fly ash for treating ammonia nitrogen waste water. The preparation method comprises the following steps of immersing a raw material of fly ash in 0.5 to 8 mol/L of a sodium hydroxide solution for 0.5 to 10 hours under the conditions of a temperature of 10 to 90 DEG C and a solid-liquid ratio of 1: (2 to 10); washing by soft water which does not contain calcium and magnesium, and drying to obtain the modified fly ash. When ammonia nitrogen waste water flows through a device loaded with the modified fly ash, ammonia nitrogen in the ammonia nitrogen waste water can be removed and an ammonia nitrogen removal rate reaches above 75%.
Description
Technical field
The present invention relates to a kind of modified coal ash that can be used to handle nitrogen-containing wastewater, specifically is the preparation method of this modified coal ash.
Background technology
The discharging of ammonia nitrogen waste water is one type of bigger pollution sources of current nitrogen fertilizer plant.A large amount of ammonia nitrogen waste waters injects after the rivers and lakes, causes the large-area eutrophication of natural, ecological, not only destroys the ecological balance, and because some areas water pollution is serious, brings great difficulty for the preliminary treatment of water for industrial use.At present, the method for ammonia nitrogen waste water processing has bioanalysis, break point chlorination method and absorption method etc.Bioanalysis has very high requirement in actual production, denitrification effect is stable inadequately; The break point chlorination method needs to add a large amount of toxic chlorine in processing procedure, so this method is not suitable for the ammonia nitrogen in the Drinking Water; Absorption method causes people's attention because of having advantages such as treatment effeciency height, technology is simple, processing cost is low.
Flyash is the product of coal-fired power plant, sees from the chemical composition and the configuration of surface of flyash, and flyash is a kind of material for water treatment preferably.Research both at home and abroad shows the main chemical compositions SiO of flyash
2And Al
2O
3Deng, have stronger adsorption capacity, aspect wastewater treatment, having wide should have prospect.Flyash has Al-O tetrahedron and the special space structure of Si-O tetrahedron, and the surface has negative electrical charge, has ion-exchange performance. but the absorption property of original state flyash is not high, needs through modification to improve absorption property.At present; The method of modifying of flyash mainly contains sour modification, alkali modification, salt modification, method such as surfactant-modified, mixed and modified, and the flyash through after the modification all can improve its clearance to dissimilar waste water; But the research that flyash is handled to ammonia nitrogen waste water is less; If can flyash extensively be applied to the processing in ammonia nitrogen waste water field, not only can reduce present ammonia nitrogen waste water processing burden, simultaneously flyash is turned waste into wealth; Realize the treatment of wastes with processes of wastes against one another, reach the doulbe-sides' victory of economy and environmental benefit.
Summary of the invention
The purpose of this invention is to provide a kind of preparation method who is used to handle the modified coal ash of ammonia nitrogen waste water; This method can obtain the ability of the ammonia nitrogen of absorption ammonia nitrogen waste water to the raw meal coal ash through modification; Reduce the cost of material of handling waste water, had low, the effective advantage of cost.
To achieve these goals, the present invention adopts following technical scheme:
A kind of preparation method who is used to handle the modified coal ash of ammonia nitrogen waste water; It is the sodium hydroxide solution of 0.5-8 mol that the raw meal coal ash is placed concentration, and making solid-to-liquid ratio is 1: 2-10, after soaking 0.5-10 hour under 10-90 ℃; Clean with dry, obtain modified coal ash.
Said raw meal coal ash is the flyash after power plant's burning, and the scope of its granular size is: 10 μ m-300 μ m.
The used rinse water of said cleaning process is to take off the soft water of removing calcium and magnesium.
After adopting such scheme, the invention has the advantages that:
1, the present invention makes it obtain the ability of the ammonia nitrogen in the absorption ammonia nitrogen waste water through the raw meal coal ash is carried out modification, and these modified coal ash raw material sources are extensive; Cost is low; Reduced the cost of material of handling waste water, and ammonia nitrogen removal frank can reach more than 75%, ammonia nitrogen removal is effective.
2, can be used as agricultural fertilizer behind the modified coal ash absorption ammonia nitrogen of the present invention and use, turn waste into wealth.
The specific embodiment
The present invention is a kind of to be used to handle the preparation method of the modified coal ash of ammonia nitrogen waste water, realizes through following scheme:
It is the sodium hydroxide solution of 0.5-8 mol that the raw meal coal ash is placed concentration, and making solid-to-liquid ratio is 1: 2-10, after soaking 0.5-10 hour under 10-90 ℃, clean with dry, and obtain modified coal ash.Ammonia nitrogen waste water is flow through the device that this modified coal ash is housed, can remove the ammonia nitrogen in the waste water, ammonia nitrogen removal frank can reach more than 75%.
Wherein, the raw meal coal ash can adopt the flyash after power plant's burning, and the scope of its granular size is: 10 μ m-300 μ m.The used rinse water of cleaning process can adopt the soft water that takes off removing calcium and magnesium.
Embodiment 1:
Raw meal coal ash (10 μ m-300 μ m) is placed the sodium hydroxide solution of 0.5 mol, and making solid-to-liquid ratio is 1: 10, after soaking 10 hours under 90 ℃ of reaction temperatures, cleans with the soft water that takes off removing calcium and magnesium, and drying obtains modified coal ash.
Ammonia nitrogen waste water (the pH value is 7, and ammonia-nitrogen content is more than 150mg/ rises) is flow through the device of the modified coal ash that embodiment 1 gained is housed, can remove the ammonia nitrogen in the waste water, ammonia nitrogen removal frank can reach more than 80%.
Embodiment 2:
Raw meal coal ash (10m-300 μ m) is placed the sodium hydroxide solution of 5 mol, and making solid-to-liquid ratio is 1: 5, after soaking 5 hours under 50 ℃ of reaction temperatures, cleans with the soft water that takes off removing calcium and magnesium, and drying obtains modified coal ash.
Ammonia nitrogen waste water (the pH value is 5, and ammonia-nitrogen content is more than 80mg/ rises) is flow through the device of the modified coal ash that embodiment 2 gained are housed, can remove the ammonia nitrogen in the waste water, ammonia nitrogen removal frank can reach more than 75%.
Embodiment 3:
Raw meal coal ash (10m-300 μ m) is placed the sodium hydroxide solution of 8 mol, and making solid-to-liquid ratio is 1: 3, after soaking 0.5 hour under 10 ℃ of reaction temperatures, cleans with the soft water that takes off removing calcium and magnesium, and drying obtains modified coal ash.
Ammonia nitrogen waste water (the pH value is 10, and ammonia-nitrogen content is more than 250mg/ rises) is flow through the device of the modified coal ash that embodiment 3 gained are housed, can remove the ammonia nitrogen in the waste water, ammonia nitrogen removal frank can reach more than 88%.
Claims (3)
1. preparation method who is used to handle the modified coal ash of ammonia nitrogen waste water; It is characterized in that: it is the sodium hydroxide solution of 0.5-8 mol that the raw meal coal ash is placed concentration; Making solid-to-liquid ratio is 1: 2-10; After soaking 0.5-10 hour under 10-90 ℃, clean with dry, obtain modified coal ash.
2. a kind of preparation method who is used to handle the modified coal ash of ammonia nitrogen waste water according to claim 1 is characterized in that: said raw meal coal ash is the flyash after power plant's burning, and the scope of its granular size is: 10 μ m-300 μ m.
3. a kind of preparation method who is used to handle the modified coal ash of ammonia nitrogen waste water according to claim 1, it is characterized in that: the used rinse water of said cleaning process is to take off the soft water of removing calcium and magnesium.
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| CN201110277856XA CN102357355A (en) | 2011-09-16 | 2011-09-16 | Preparation method of modified fly ash for treating ammonia nitrogen waste water |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814473A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Preparation method of low-viscosity casting powder for preparing steelmaking cast ingots |
| CN102825231A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Crystallizer covering slag for continuously casting hot rolled steel and manufacturing method of crystallizer covering slag |
| CN102825227A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Continuous casting crystallizer casting powder for high-manganese wear-resistant steel |
| CN105819887A (en) * | 2016-03-08 | 2016-08-03 | 武汉大学 | Preparation method of non-sintered ceramsite with ammonia nitrogen adsorption function |
| CN105819891A (en) * | 2016-03-08 | 2016-08-03 | 武汉大学 | Preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment |
| CN106000288A (en) * | 2016-06-17 | 2016-10-12 | 广东省资源综合利用研究所 | Preparing method of rare-earth-carried modified fly ash |
| CN106076248A (en) * | 2016-06-17 | 2016-11-09 | 广东省资源综合利用研究所 | A kind of preparation method of rare earth modified flyash |
| CN107684897A (en) * | 2017-07-21 | 2018-02-13 | 中国环境科学研究院 | The denitrifier and its methods and applications prepared using river bottom mud |
| CN108033592A (en) * | 2017-11-27 | 2018-05-15 | 浙江师范大学 | A kind of processing method of high ammonia-nitrogen wastewater |
| CN111392804A (en) * | 2020-02-25 | 2020-07-10 | 国电新能源技术研究院有限公司 | Water purification method by using fly ash |
Citations (2)
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| CN101148301A (en) * | 2007-08-21 | 2008-03-26 | 南京大学 | Method for removing ammonia and nitrogen from coking wastewater |
| CN101428983A (en) * | 2008-12-11 | 2009-05-13 | 上海电力学院 | Method for modification treatment of coal ash |
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2011
- 2011-09-16 CN CN201110277856XA patent/CN102357355A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101148301A (en) * | 2007-08-21 | 2008-03-26 | 南京大学 | Method for removing ammonia and nitrogen from coking wastewater |
| CN101428983A (en) * | 2008-12-11 | 2009-05-13 | 上海电力学院 | Method for modification treatment of coal ash |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102814473A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Preparation method of low-viscosity casting powder for preparing steelmaking cast ingots |
| CN102825231A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Crystallizer covering slag for continuously casting hot rolled steel and manufacturing method of crystallizer covering slag |
| CN102825227A (en) * | 2012-07-31 | 2012-12-19 | 马鞍山科润冶金材料有限公司 | Continuous casting crystallizer casting powder for high-manganese wear-resistant steel |
| CN105819887A (en) * | 2016-03-08 | 2016-08-03 | 武汉大学 | Preparation method of non-sintered ceramsite with ammonia nitrogen adsorption function |
| CN105819891A (en) * | 2016-03-08 | 2016-08-03 | 武汉大学 | Preparation method of sludge ceramsite used for medium and low concentration ammonia nitrogen wastewater treatment |
| CN106000288A (en) * | 2016-06-17 | 2016-10-12 | 广东省资源综合利用研究所 | Preparing method of rare-earth-carried modified fly ash |
| CN106076248A (en) * | 2016-06-17 | 2016-11-09 | 广东省资源综合利用研究所 | A kind of preparation method of rare earth modified flyash |
| CN107684897A (en) * | 2017-07-21 | 2018-02-13 | 中国环境科学研究院 | The denitrifier and its methods and applications prepared using river bottom mud |
| CN108033592A (en) * | 2017-11-27 | 2018-05-15 | 浙江师范大学 | A kind of processing method of high ammonia-nitrogen wastewater |
| CN108033592B (en) * | 2017-11-27 | 2021-01-26 | 浙江师范大学 | Treatment method of high ammonia nitrogen wastewater |
| CN111392804A (en) * | 2020-02-25 | 2020-07-10 | 国电新能源技术研究院有限公司 | Water purification method by using fly ash |
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Application publication date: 20120222 |