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Method for synergistically degrading azo dye by using ultrasonic-ultraviolet-magnesium desulfurization slag

A technology of magnesium desulfurization and azo dyes, applied in chemical instruments and methods, water pollutants, multi-stage water treatment, etc., can solve the problems of reduced desulfurization costs, high infrastructure investment and operating costs, and achieve significant economic benefits Effect

Pending Publication Date: 2021-06-08
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the infrastructure investment and operating costs of the above methods are relatively high, and only when the recovered products can be sold, the desulfurization cost can be significantly reduced

Method used

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  • Method for synergistically degrading azo dye by using ultrasonic-ultraviolet-magnesium desulfurization slag
  • Method for synergistically degrading azo dye by using ultrasonic-ultraviolet-magnesium desulfurization slag

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Experimental program
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Effect test

Embodiment 1

[0017] A method for synergistically degrading azo dyes with ultrasonic-ultraviolet-magnesium desulfurization slag in this embodiment is carried out according to the following steps:

[0018] (1) Dry the waste (desulfurization residue) from the wet magnesium flue gas desulfurization system in stable operation at 80°C, grind it through an 80-mesh sieve, and take the powder under the sieve and bag it for use;

[0019] (2) Take 200 mL of methyl orange wastewater with a concentration of 150 mg / L in the reaction tank, add 0.8 g of pretreated desulfurization residue, and adjust the reaction pH of the solution to 2.5. Irradiate the reaction solution at an ultrasonic frequency of 80 kHz and a 20W ultraviolet lamp for 2.0 h;

[0020] (3) Adjust the pH of the treated wastewater to 6.0, and after standing for a period of time, filter the water.

[0021] After treatment, the removal rate of methyl orange in wastewater can reach more than 85%.

Embodiment 2

[0023] A method for synergistically degrading azo dyes with ultrasonic-ultraviolet-magnesium desulfurization slag in this embodiment is carried out according to the following steps:

[0024] (1) Dry the waste (desulfurization residue) from the wet magnesium flue gas desulfurization system in stable operation at 80°C, grind it through an 80-mesh sieve, and take the powder under the sieve and bag it for use;

[0025] (2) Take 150 mL of methyl orange wastewater with a concentration of 200 mg / L in the reaction tank, add 1.0 g of pretreated desulfurization residue, and adjust the reaction pH of the solution to 3.0. Irradiate the reaction solution at an ultrasonic frequency of 100 kHz and a 60W ultraviolet lamp for 3.0 h;

[0026] (3) Adjust the pH of the treated wastewater to 7.0, and after standing for a period of time, filter the water.

[0027] After treatment, the removal rate of methyl orange in wastewater can reach more than 90%.

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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 synergistically degrading an azo dye by using ultrasonic-ultraviolet-magnesium process desulfurization slag. According to the method, the wet-type magnesium oxidedesulfurization slag is used as a reducing agent, under the synergistic effect of ultrasonic waves and ultraviolet light, azo dyes in the wastewater are degraded and removed by utilizing strong reducing free radicals generated by an advanced reduction system consisting of the ultrasonic-ultraviolet-magnesium desulfurization slag. The method mainly comprises the following steps: (1) drying, grinding and sieving wastes (desulfurization slag) generated by a stably operated wet-type magnesium oxide flue gas desulfurization system, and bagging sieved powder for later use; (2) putting a certain amount of azo dye wastewater into a reaction tank, adding a certain amount of pretreated desulfurized fly ash, adjusting the pH value of the solution, and treating the wastewater under ultrasonic and ultraviolet lamp irradiation conditions; and (3) adjusting the treated wastewater to be neutral, performing standing for a period of time, and filtering the effluent. According to the process, high-added-value resource utilization of the waste is achieved while harmless treatment is conducted on the waste water and the waste, the purpose of treating waste with waste is achieved, and the method has remarkable economic benefits, social benefits and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste and advanced reduction treatment of waste water, and specifically relates to a method for synergistically degrading azo dyes by ultrasonic-ultraviolet-magnesium desulfurization slag. Background technique [0002] In recent years, wet magnesium flue gas desulfurization technology has attracted widespread attention due to its unique advantages. Compared with the wet lime-gypsum method, the magnesium method has high desulfurization efficiency, low liquid-gas ratio, is not easy to block pipelines, and has lower operation and infrastructure costs. Its desulfurization by-products are mainly composed of magnesium sulfite, a small amount of magnesium sulfate and unreacted desulfurization agent magnesium hydroxide. At present, the treatment methods for the by-products of flue gas desulfurization by the wet magnesium oxide process mainly include the discarding method, the forced...

Claims

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Application Information

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IPC IPC(8): C02F1/70C02F1/36C02F1/32C02F1/66C02F9/04C02F9/08C02F101/34C02F101/38
CPCC02F1/70C02F1/36C02F1/32C02F1/66C02F9/00C02F2101/345C02F2101/38C02F2101/308C02F2301/08
Inventor 方得安
Owner SHENYANG UNIV
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