CN112919609A - Method for synergistically degrading azo dye by desulfurization slag through ultrasonic-ultraviolet-magnesium method - Google Patents
Method for synergistically degrading azo dye by desulfurization slag through ultrasonic-ultraviolet-magnesium method Download PDFInfo
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- CN112919609A CN112919609A CN202110238188.3A CN202110238188A CN112919609A CN 112919609 A CN112919609 A CN 112919609A CN 202110238188 A CN202110238188 A CN 202110238188A CN 112919609 A CN112919609 A CN 112919609A
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 35
- 230000023556 desulfurization Effects 0.000 title claims abstract description 35
- 239000002893 slag Substances 0.000 title claims abstract description 27
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 23
- 239000011777 magnesium Substances 0.000 title claims abstract description 23
- 239000000987 azo dye Substances 0.000 title claims abstract description 18
- 230000000593 degrading effect Effects 0.000 title claims abstract description 9
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 239000002351 wastewater Substances 0.000 claims abstract description 21
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 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
- 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
- 230000002195 synergetic effect Effects 0.000 claims abstract description 6
- 238000001035 drying 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
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 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
- 230000015556 catabolic process Effects 0.000 claims 3
- 238000006731 degradation reaction Methods 0.000 claims 3
- 230000035484 reaction time Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 10
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002910 solid waste Substances 0.000 abstract description 2
- 230000007935 neutral effect Effects 0.000 abstract 1
- 238000002604 ultrasonography Methods 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
- 230000001678 irradiating effect Effects 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
- 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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- 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
- 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
- C02F1/34—Treatment of water, waste water, or sewage with mechanical oscillations
- C02F1/36—Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- 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
- C02F2101/308—Dyes; Colorants; Fluorescent agents
-
- 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
- C02F2101/34—Organic compounds containing oxygen
- C02F2101/345—Phenols
-
- 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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention belongs to the technical field of solid waste resource utilization and wastewater advanced reduction treatment, and particularly relates to a method for degrading azo dyes by using ultrasonic-ultraviolet-magnesium method desulfurization slag in a synergistic manner. 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 pH value of the solution, and treating the wastewater under the irradiation conditions of ultrasound and 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 wastewater advanced reduction treatment, and particularly relates to a method for synergistically degrading azo dyes by desulfurization slag by an ultrasonic-ultraviolet-magnesium method.
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 using ultrasonic-ultraviolet-magnesium method desulfurization slag in a synergic manner, which takes wet magnesium oxide method desulfurization slag as a reducing agent, utilizes strong reducing free radicals generated by a high-grade reduction system consisting of the ultrasonic-ultraviolet-magnesium method desulfurization slag to degrade and remove the azo dyes in wastewater under the synergistic effect of ultrasonic waves and ultraviolet light, realizes high value-added resource utilization of wastes while performing harmless treatment on the wastewater and the wastes, achieves the purpose of treating the wastes with the wastes, and has remarkable economic benefit, social benefit and environmental benefit.
1. A method for degrading azo dyes by the synergy of desulfurization slag of an ultrasonic-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. Reacting for 0.5-4.0 h under the irradiation conditions of ultrasonic wave with the frequency of 40-100 kHz and an ultraviolet lamp with the power of 20-80W;
(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 carried out for 0.5 to 4.0 hours under the conditions of ultrasonic wave with the frequency of 40 to 100 kHz and ultraviolet lamp irradiation with the frequency of 20 to 80W.
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 degrading azo dye by the synergy of the desulfurization slag by the ultrasonic-ultraviolet-magnesium method 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 150 mg/L into a reaction tank, adding 0.8g of pretreated desulfurization slag, and adjusting the reaction pH of the solution to be = 2.5. Irradiating the reaction solution for 2.0 h at an ultrasonic frequency of 80 kHz and a 20W ultraviolet lamp;
(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 degrading azo dye by the synergy of the desulfurization slag by the ultrasonic-ultraviolet-magnesium method 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 1.0g of pretreated desulfurization slag, and adjusting the reaction pH of the solution to be = 3.0. Irradiating the reaction solution for 3.0 h at an ultrasonic frequency of 100 kHz and a 60W 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 over 90 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 degrading azo dyes by the synergy of desulfurization slag of an ultrasonic-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 solution with HCl and NaOH to react at pH =2.5-7.0, and reacting for 0.5-4.0 h under the conditions of 40-100 kHz ultrasonic wave and 20-80W ultraviolet lamp irradiation;
(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 the synergistic degradation of azo dyes by the ultrasonic-ultraviolet-magnesium desulfurization slag according to claim 1, characterized in that the magnesium desulfurization slag belongs to waste generated by wet magnesium oxide flue gas desulfurization.
3. The method for the synergistic degradation of the azo dye by the desulfurization slag through the ultrasonic-ultraviolet-magnesium method according to claim 1, characterized in that the mass of the desulfurization slag added into 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 the synergistic degradation of azo dyes from desulfurization residues by the ultrasonic-ultraviolet-magnesium method according to claim 1, wherein the reaction is carried out under the ultrasonic condition with the frequency of 40-100 kHz and the ultraviolet lamp irradiation condition with the ultraviolet lamp irradiation frequency of 20W-80W, and the reaction time is 0.5-4.0 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110238188.3A CN112919609A (en) | 2021-03-04 | 2021-03-04 | Method for synergistically degrading azo dye by desulfurization slag through ultrasonic-ultraviolet-magnesium method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110238188.3A CN112919609A (en) | 2021-03-04 | 2021-03-04 | Method for synergistically degrading azo dye by desulfurization slag through ultrasonic-ultraviolet-magnesium method |
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| CN112919609A true CN112919609A (en) | 2021-06-08 |
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| CN202110238188.3A Pending CN112919609A (en) | 2021-03-04 | 2021-03-04 | Method for synergistically degrading azo dye by desulfurization slag through ultrasonic-ultraviolet-magnesium method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200336A (en) * | 2007-12-18 | 2008-06-18 | 赵志军 | Process for zero-discharge treatment of o-phenylenediamine sodium sulfide reduction wastewater |
| CN105923835A (en) * | 2016-06-20 | 2016-09-07 | 东北大学 | Method for treating vanadium industrial waste water by magnesium desulfurization wastes |
| US20170217803A1 (en) * | 2011-11-07 | 2017-08-03 | Marcus George Theodore | Redox water treatment method |
-
2021
- 2021-03-04 CN CN202110238188.3A patent/CN112919609A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101200336A (en) * | 2007-12-18 | 2008-06-18 | 赵志军 | Process for zero-discharge treatment of o-phenylenediamine sodium sulfide reduction wastewater |
| US20170217803A1 (en) * | 2011-11-07 | 2017-08-03 | Marcus George Theodore | Redox water treatment method |
| 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 (3)
| Title |
|---|
| 涂锋: "工业废料中六价铬化合物的无害处理方法", 《四川环境》 * |
| 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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