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Method for advanced reduction degradation of azo dye by using ultraviolet/magnesium process desulfurization slag

A magnesium desulfurization and azo dye technology, applied in the field of solid waste resource utilization, can solve the problems of high infrastructure investment and operation costs, and reduced desulfurization costs

Pending Publication Date: 2021-05-18
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 advanced reduction degradation of azo dye by using ultraviolet/magnesium process desulfurization slag
  • Method for advanced reduction degradation of azo dye by using ultraviolet/magnesium process desulfurization slag

Examples

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Effect test

Embodiment 1

[0017] A method of using ultraviolet / magnesium desulfurization slag in this embodiment for advanced reduction and degradation of azo dyes 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 150 mL of methyl orange wastewater with a concentration of 200 mg / L in the reaction tank, add 0.9 g of pretreated desulfurization residue, and adjust the reaction pH of the solution to 3.5. Continue to stir, and irradiate the reaction solution with a 20W ultraviolet lamp for 3.0 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 of using ultraviolet / magnesium desulfurization slag in this embodiment for advanced reduction and degradation of azo dyes 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 200 mL of methyl orange wastewater with a concentration of 100 mg / L in the reaction tank, add 0.8 g of pretreated desulfurization residue, and adjust the reaction pH of the solution to 3.0. Continue to stir, and irradiate the reaction solution with an 80W ultraviolet lamp for 2.0 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 85%.

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Abstract

The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for advanced reductive degradation of azo dye by using ultraviolet / magnesium process desulfurization slag, which comprises the following steps of: taking wet magnesium process flue gas desulfurization slag as a reducing agent; and degrading and removing the azo dye in the wastewater by utilizing strong reducing free radicals generated by the UV / desulfurization slag advanced reduction system under the promotion action of ultraviolet light. The method mainly comprises the following steps: (1) drying, grinding and sieving wastes (desulfurization residues) 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 reaction pH of the solution, and irradiating the reaction solution with an ultraviolet lamp; and (3) adjusting the treated wastewater to be neutral, 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 remarkable economic benefits, social benefits and environmental benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and in particular relates to a method for advanced reduction and degradation of azo dyes by using 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 oxidation recovery of magnesium sulfate...

Claims

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Application Information

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IPC IPC(8): C02F1/32C02F1/70C02F101/38C02F103/30C02F103/18
CPCC02F1/32C02F1/70C02F2101/38C02F2103/30C02F2103/18
Inventor 方得安
Owner SHENYANG UNIV
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