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Treatment method of medium-alkaline azo dye-containing wastewater

A technology of azo dyes and treatment methods, applied in water/sewage treatment, multi-stage water/sewage treatment, degassed water/sewage treatment, etc., can solve the problems of no degradation activity, reduced reduction activity, and low degradation performance

Active Publication Date: 2021-09-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing research results show that as the pH of wastewater increases, the reducing activity of zero-valent metals gradually decreases, or even has almost no degradation activity, which leads to their degradation performance under alkaline conditions being significantly lower than those in acidic and neutral environments. performance

Method used

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  • Treatment method of medium-alkaline azo dye-containing wastewater
  • Treatment method of medium-alkaline azo dye-containing wastewater
  • Treatment method of medium-alkaline azo dye-containing wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The surface of the pure iron sheet was polished to remove the scale, and the electrochemical experiments were carried out in the original and deoxidized golden orange II dye solutions. Nitrogen was exposed to the solution for 30 minutes to remove oxygen, the dye concentration was 25mg / L, pH=6.0, and the test temperature was 25°C. Test results such as figure 1 shown.

[0048] figure 1 Polarization curves of pure iron flakes in pristine and deoxygenated golden orange II dye solutions at pH = 6.0. It can be seen from the figure that when the dissolved oxygen in the solution is eliminated, the corrosion potential of the pure iron sheet drops from -0.255V to -0.370V, and the corrosion current density decreases from 5.4×10 -7 A / cm 2 up to 7.2×10 -7 A / cm 2 . The test results show that the reactivity of the pure iron sheet in the dye solution becomes stronger after oxygen removal.

Embodiment 2

[0050] The surface of the pure iron sheet was polished to remove the scale, and the electrochemical experiments were carried out in the original and deoxidized golden orange II dye solutions. Nitrogen was exposed to the solution for 30 minutes to remove oxygen, the dye concentration was 25mg / L, pH=10.0, and the test temperature was 25°C. Test results such as figure 2 shown.

[0051] figure 2 Polarization curves of pure iron flakes in pristine and deoxygenated golden orange II dye solutions at pH = 10.0. It can be seen from the figure that when the dissolved oxygen in the solution is eliminated, the corrosion potential of the pure iron sheet drops significantly from -0.368V to -0.646V, and the corrosion current density decreases from about 6.4×10 -7 A / cm 2 Significantly increased to 1.1×10 -6 A / cm 2 . The test results show that after oxygen removal, the reactivity of the pure iron sheet in the highly basic dye solution is greatly enhanced.

Embodiment 3

[0053] Clean the pure iron particles with an average particle size of 350 μm with hydrochloric acid of pH = 2.5 to remove surface oxides, and then fully wash with deionized water to remove residual acid. The cleaned pure iron is used to degrade golden oranges with a concentration of 25mg / L For solution II, the amount of pure iron used is 10g / L, the experimental temperature is 25°C, and the stirring speed is 240rpm. The test solution is divided into the original pH and deoxygenated solution, and the deoxygenated solution is obtained by aerating nitrogen for 30 minutes.

[0054] image 3 When pH=6.0 and 10.0, the normalized concentration of pure iron degraded original Golden Orange II solution and deoxygenated Golden Orange II solution varies with the degradation time. It can be seen from the figure that in the dye solution without oxygen removal, pure iron shows lower degradation performance at pH=6.0 and 10.0; in the dye solution with oxygen removal, the degradation rate of p...

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Abstract

The invention discloses a treatment method for medium-alkaline azo-dye-containing wastewater, which comprises the following steps: using an inert gas to deoxygenate the azo-dye-containing wastewater whose initial pH value is 6-12, and remove the azo-dye-containing wastewater Dissolved oxygen in dye wastewater; application of zero-valent metals to the azo dye-containing wastewater for wastewater treatment.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a treatment method for medium-alkaline azo dye-containing wastewater. Background technique [0002] my country is a big country in the printing and dyeing industry, and the discharged printing and dyeing wastewater is an important component of industrial wastewater, and azo dyes are currently the most widely used type of dyes. As the main pollutant in printing and dyeing wastewater, azo dyes contain one or more azo double bonds in their molecular structure and are chemically stable. There are intramolecular hydrogen bonds in the molecular structure of most azo dyes currently produced and used, which further improves the stability of azo dyes. The discharge of untreated azo dye wastewater will pose a continuous threat to the ecological environment and human health. [0003] Due to the high chemical stability of azo dyes, it is difficult to degrade in the natural environ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/38
CPCC02F1/20C02F1/705C02F2101/308C02F2101/38
Inventor 姚可夫斯佳佳栾亨伟杨兴龙邵洋
Owner TSINGHUA UNIV
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