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Method for synergistically degrading azo dye by ultrasonic-ultraviolet-semi-dry desulfurization ash

A semi-dry desulfurization and azo dye technology, which is applied in the field of solid waste resource utilization and advanced reduction treatment of wastewater, can solve problems such as difficulty in comprehensive utilization, complex and changeable components of desulfurization products, etc., and achieve significant economic benefits.

Pending Publication Date: 2021-06-04
SHENYANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the composition of its desulfurization products is complex and changeable (the main components are calcium sulfite, calcium carbonate, calcium hydroxide and a small amount of calcium sulfate, etc.), it is strongly alkaline and easy to decompose, so comprehensive utilization is very difficult

Method used

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  • Method for synergistically degrading azo dye by ultrasonic-ultraviolet-semi-dry desulfurization ash

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Effect test

Embodiment 1

[0017] A method of ultrasonic-ultraviolet-semi-dry desulfurization ash synergistically degrading azo dyes in this embodiment is carried out according to the following steps:

[0018] (1) Grind the desulfurization ash from the semi-dry calcium flue gas desulfurization system in stable operation and pass it through an 80-mesh sieve, then take the powder under the sieve and pack it into bags for later use;

[0019] (2) Take 150 mL of methyl orange wastewater with a concentration of 100 mg / L in the reaction tank, add 0.8 g of pretreated desulfurization ash, and adjust the reaction pH of the solution to 2.5. React for 3.0 h under the conditions of 80kHz ultrasound and 60W ultraviolet lamp irradiation;

[0020] (3) Adjust the pH of the treated wastewater to 7.0, 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 90%.

Embodiment 2

[0023] A method of ultrasonic-ultraviolet-semi-dry desulfurization ash synergistically degrading azo dyes in this embodiment is carried out according to the following steps:

[0024] (1) Grind the desulfurization ash from the semi-dry calcium flue gas desulfurization system in stable operation and pass it through an 80-mesh sieve, then take the powder under the sieve and pack it into bags for later use;

[0025] (2) Take 200 mL of methyl orange wastewater with a concentration of 200 mg / L in the reaction tank, add 2.5 g of pretreated desulfurization ash, and adjust the reaction pH of the solution to 3.0. React for 3.0 h under the conditions of 100kHz ultrasound and 60W ultraviolet lamp irradiation;

[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 through ultrasonic-ultraviolet-semi-dry desulfurization ash. The azo dye in the wastewater is degraded and removed by utilizing strong reducing free radicals generated by an advanced reduction system consisting of ultrasound, ultraviolet and desulfurized fly ash under the synergistic effect of ultrasound and ultraviolet light. The method mainly comprises the following steps: (1) grinding and sieving wastes (desulfurized fly ash) generated by a stably operated semi-dry calcium 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 treating the wastewater under ultrasonic and ultraviolet lamp irradiation conditions; 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 advanced reduction treatment of waste water, and specifically relates to a method for synergistically degrading azo dyes by ultrasonic-ultraviolet-semi-dry desulfurization ash. Background technique [0002] The semi-dry flue gas desulfurization process is a flue gas desulfurization technology that combines the advantages of wet and dry methods. Compared with wet methods, this method has high desulfurization efficiency, simple process system, low infrastructure costs, and a small footprint. The desulfurization product is similar to the dry method, and it is in the form of dry powder without waste water. However, its desulfurization products have complex and changeable components (the main components are calcium sulfite, calcium carbonate, calcium hydroxide and a small amount of calcium sulfate, etc.), are strongly alkaline and easy to decompose, so comprehensive util...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/30
CPCC02F9/00C02F2101/308C02F1/32C02F1/36C02F1/70C02F1/66C02F1/001
Inventor 方得安
Owner SHENYANG UNIV
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