CN112811507A - Method for advanced reductive degradation of azo dye by using ultraviolet/magnesium desulfurization residues - Google Patents
Method for advanced reductive degradation of azo dye by using ultraviolet/magnesium desulfurization residues Download PDFInfo
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- CN112811507A CN112811507A CN202110248720.XA CN202110248720A CN112811507A CN 112811507 A CN112811507 A CN 112811507A CN 202110248720 A CN202110248720 A CN 202110248720A CN 112811507 A CN112811507 A CN 112811507A
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- desulfurization
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 27
- 230000023556 desulfurization Effects 0.000 title claims abstract description 27
- 239000011777 magnesium Substances 0.000 title claims abstract description 22
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 21
- 239000000987 azo dye Substances 0.000 title claims abstract description 18
- 230000015556 catabolic process Effects 0.000 title claims description 10
- 238000006731 degradation reaction Methods 0.000 title claims description 10
- 230000002829 reductive effect Effects 0.000 title claims description 10
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 238000006243 chemical reaction Methods 0.000 claims abstract description 19
- 239000002893 slag Substances 0.000 claims abstract description 19
- 239000002351 wastewater Substances 0.000 claims abstract description 18
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003546 flue gas Substances 0.000 claims abstract description 9
- 230000001678 irradiating effect Effects 0.000 claims abstract description 6
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000000227 grinding Methods 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000001914 filtration Methods 0.000 claims abstract description 3
- 230000008569 process Effects 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- 238000007873 sieving Methods 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 claims description 2
- 231100000719 pollutant Toxicity 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 10
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000000593 degrading effect Effects 0.000 abstract description 2
- 239000002910 solid waste Substances 0.000 abstract description 2
- 230000007935 neutral effect Effects 0.000 abstract 1
- CSNNHWWHGAXBCP-UHFFFAOYSA-L Magnesium sulfate Chemical compound [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 4
- 229940012189 methyl orange Drugs 0.000 description 4
- 239000006227 byproduct Substances 0.000 description 2
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 2
- 235000019341 magnesium sulphate Nutrition 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- JESHZQPNPCJVNG-UHFFFAOYSA-L magnesium;sulfite Chemical compound [Mg+2].[O-]S([O-])=O JESHZQPNPCJVNG-UHFFFAOYSA-L 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
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Classifications
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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
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
-
- 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
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- 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
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- 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
- C02F2103/30—Nature of the water, waste water, sewage or sludge to be treated from the textile industry
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Removal Of Specific Substances (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for degrading azo dyes by advanced reduction of desulfurization residues by an ultraviolet/magnesium method. The method mainly comprises the following steps: (1) drying waste (desulfurized slag) generated by a wet magnesium oxide flue gas desulfurization system which operates stably, grinding the waste to pass through a sieve, and bagging the powder under the sieve for later use; (2) placing a certain amount of azo dye wastewater into a reaction tank, adding a certain amount of pretreated desulfurization ash, adjusting the reaction pH of the solution, and irradiating the reaction solution by using an ultraviolet lamp; (3) adjusting the treated wastewater to be neutral, standing for a period of time, and filtering out water. The process realizes high value-added resource utilization of the waste while performing harmless treatment on the waste water and the waste, achieves the aim of treating the waste by the waste, and has remarkable economic benefit, social benefit and environmental benefit.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for advanced reduction degradation of azo dyes by using ultraviolet/magnesium desulphurization slag.
Background
In recent years, the wet magnesium flue gas desulfurization technology has attracted much attention due to its unique advantages. Compared with the wet lime-gypsum method, the magnesium method has high desulfurization efficiency, low liquid-gas ratio, difficult blockage of pipelines and lower operation and capital construction cost. The desulfurization by-product mainly comprises magnesium sulfite, a small amount of magnesium sulfate and unreacted desulfurizing agent magnesium hydroxide. At present, the treatment methods of the flue gas desulfurization by-products by the wet magnesium oxide method mainly comprise a abandoning method, a method for recovering magnesium sulfate by forced oxidation and a method for regenerating magnesium oxide by pyrolysis. However, the above processes are relatively expensive in both capital and operating costs, and the cost of desulfurization can only be significantly reduced if the recovered product can be sold. Therefore, it is very important to find a low-cost desulphurization slag treatment method or resource utilization mode.
Disclosure of Invention
The invention provides a method for degrading azo dyes by advanced reduction of desulfurization residues by an ultraviolet/magnesium method, which takes wet-type desulfurization residues by a magnesium oxide method as a reducing agent, degrades and removes the azo dyes in wastewater by strong reducing radicals generated by an advanced reduction system of the UV/desulfurization residues under the promotion action of ultraviolet light, realizes high value-added resource utilization of wastes while performing harmless treatment on the wastewater and the wastes, achieves the aim of treating the wastes by the wastes, and has remarkable economic benefit, social benefit and environmental benefit.
1. A method for advanced reductive degradation of azo dyes by using desulfurization residues by an ultraviolet/magnesium method is characterized by comprising the following steps:
(1) drying the waste (desulfurized slag) generated by a wet magnesium flue gas desulfurization system which operates stably at 80 ℃, grinding and sieving the waste by a 80-mesh sieve, and bagging the powder under the sieve for later use;
(2) and (2) putting a certain amount of azo dye wastewater into a reaction tank, adding a certain amount of pretreated desulfurization ash, and adjusting the solution with HCl and NaOH to react, wherein the pH is = 2.5-7.0. Continuously stirring, and irradiating the reaction solution with a 20-80W ultraviolet lamp for 0.5-4.0 h;
(3) adjusting the pH of the treated wastewater to be 6.0-7.0, standing for a period of time, and filtering out water.
The magnesium desulphurization slag belongs to waste generated by wet magnesium oxide flue gas desulphurization.
The mass of the desulfurization slag added into the reaction tank is about 20-80 times of that of azo dye pollutants in the wastewater, and the reaction pH = 2.5-7.0.
The reaction needs to be irradiated by an ultraviolet lamp with the power of 20W-80W for 0.5-4.0 h under the condition of continuous stirring.
Compared with the prior art, the invention has the characteristics and beneficial effects that:
the invention realizes the high value-added resource utilization of the waste while performing harmless treatment on the waste water and the waste, achieves the aim of treating the waste by the waste, and has obvious economic benefit, social benefit and environmental benefit.
Drawings
FIG. 1 is a photograph of a magnesium-based desulfurization slag used in the examples of the present invention.
FIG. 2 is an XRD pattern of a magnesium desulfurization slag used in the examples of the present invention.
Detailed Description
The method and technique of the present invention are described below by way of example, but not limitation in practical applications.
Example 1
The method for advanced reductive degradation of azo dyes by using ultraviolet/magnesium desulphurization slag comprises the following steps:
(1) drying the waste (desulfurized slag) generated by a wet magnesium flue gas desulfurization system which operates stably at 80 ℃, grinding and sieving the waste by a 80-mesh sieve, and bagging the powder under the sieve for later use;
(2) and (3) taking 150 mL of methyl orange wastewater with the concentration of 200 mg/L into a reaction tank, adding 0.9 g of pretreated desulfurization slag, and adjusting the reaction pH of the solution to be = 3.5. Continuously stirring, and irradiating the reaction solution by using a 20W ultraviolet lamp for 3.0 h;
(3) the treated wastewater was adjusted to pH =6.0 and after standing for a period of time, the water was filtered off.
The methyl orange removal rate of the treated wastewater can reach more than 85 percent through measurement.
Example 2
The method for advanced reductive degradation of azo dyes by using ultraviolet/magnesium desulphurization slag comprises the following steps:
(1) drying the waste (desulfurized slag) generated by a wet magnesium flue gas desulfurization system which operates stably at 80 ℃, grinding and sieving the waste by a 80-mesh sieve, and bagging the powder under the sieve for later use;
(2) and (3) putting 200 mL of methyl orange wastewater with the concentration of 100 mg/L into a reaction tank, adding 0.8 g of pretreated desulfurization slag, and adjusting the reaction pH of the solution to be = 3.0. Continuously stirring, and irradiating the reaction solution for 2.0 h by using an 80W ultraviolet lamp;
(3) the treated wastewater was adjusted to pH =7.0 and after standing for a period of time, the water was filtered off.
The methyl orange removal rate of the treated wastewater can reach more than 85 percent through measurement.
The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto,
technical solutions according to the present invention and methods thereof within the technical scope of the present disclosure
The inventive concept is intended to cover such alternatives, modifications and equivalents as may be included within the spirit and scope of the invention.
Claims (4)
1. A method for advanced reductive degradation of azo dyes by using desulfurization residues by an ultraviolet/magnesium method is characterized by comprising the following steps:
(1) drying the waste (desulfurized slag) generated by a wet magnesium flue gas desulfurization system which operates stably at 80 ℃, grinding and sieving the waste by a 80-mesh sieve, and bagging the powder under the sieve for later use;
(2) placing a certain amount of azo dye wastewater into a reaction tank, adding a certain amount of pretreated desulfurization ash, adjusting the pH of the solution to be 2.5-7.0 by using HCl and NaOH, continuously stirring, and irradiating the reaction solution by using a 20-80W ultraviolet lamp for 0.5-4.0 h;
(3) adjusting the pH of the treated wastewater to be 6.0-7.0, standing for a period of time, and filtering out water.
2. The method for advanced reductive degradation of azo dyes by using ultraviolet/magnesium desulphurization slag according to claim 1, wherein the magnesium desulphurization slag belongs to waste generated by wet magnesium oxide flue gas desulphurization.
3. The method for advanced reductive degradation of azo dyes by using ultraviolet/magnesium desulphurization slag according to claim 1, characterized in that the mass of the desulphurization slag added in the reaction tank is about 20-80 times of the mass of azo dye pollutants in the wastewater, and the reaction pH = 2.5-7.0.
4. The method for advanced reductive degradation of azo dyes from desulfurization residue by UV/Mg process according to claim 1, wherein the reaction is carried out by irradiating with UV lamp of 20W-80W for 0.5-4.0 h under continuous stirring.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110248720.XA CN112811507A (en) | 2021-03-08 | 2021-03-08 | Method for advanced reductive degradation of azo dye by using ultraviolet/magnesium desulfurization residues |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110248720.XA CN112811507A (en) | 2021-03-08 | 2021-03-08 | Method for advanced reductive degradation of azo dye by using ultraviolet/magnesium desulfurization residues |
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| CN112811507A true CN112811507A (en) | 2021-05-18 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999019257A2 (en) * | 1997-10-09 | 1999-04-22 | Waste Water Reclamation Technologies, Inc. | Processes and systems for treating wastewater effluent |
| CN101353210A (en) * | 2008-09-22 | 2009-01-28 | 华南理工大学 | Method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar |
| CN105923835A (en) * | 2016-06-20 | 2016-09-07 | 东北大学 | Method for treating vanadium industrial waste water by magnesium desulfurization wastes |
-
2021
- 2021-03-08 CN CN202110248720.XA patent/CN112811507A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999019257A2 (en) * | 1997-10-09 | 1999-04-22 | Waste Water Reclamation Technologies, Inc. | Processes and systems for treating wastewater effluent |
| CN101353210A (en) * | 2008-09-22 | 2009-01-28 | 华南理工大学 | Method for processing aluminum section bar chromizing waste water with calcium sulfite type desulphurization mortar |
| CN105923835A (en) * | 2016-06-20 | 2016-09-07 | 东北大学 | Method for treating vanadium industrial waste water by magnesium desulfurization wastes |
Non-Patent Citations (2)
| Title |
|---|
| 程爱华等: "高级还原技术处理偶氮染料废水的研究", 《现代化工》 * |
| 韩慧丽等: "真空紫外-亚硫酸盐法降解PFOS影响因素", 《环境科学》 * |
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Application publication date: 20210518 |
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