Method for decoloring printing and dyeing waste water of reactive dye

Abstract

The invention discloses a method for decoloring printing and dyeing waste water of reactive dye and belongs to the technical field of waste water treatment. The method is characterized by comprising the following steps: adding oxidant with the dose of 0.5 to 10 g / l into the printing and dyeing waste water of the reactive dye and treating at the temperature of 20 and 55 DEG C for 5 to 60 minutes, wherein the oxidant is oxygen-containing oxidant or chlorine-containing oxidant; adding flocculant with the dose of 0.5 to 15 g / l, wherein the flocculant is bivalent or trivalent metal inorganic salt; adjusting the pH value of the waste water to 8 to 14; standing for 5 to 10 minutes; and performing centrifugal treatment at the rotating speed of 1,500 to 5,000 rpm for 2 to 12 minutes. The method for decoloring the printing and dyeing waste water of the reactive dye has important practical significance of saving energy and reducing emission in the textile printing and dyeing industry and solving the chromaticity of the printing and dyeing waste water of the reactive dye.

Description

Technical field:

[0001] The invention relates to a method for decolorizing reactive dye printing and dyeing wastewater, which belongs to the technical field of wastewater treatment. Background technique:

[0002] Reactive dyes contain one or more reactive groups in their molecules, which can react with hydroxyl groups on cellulose fibers, amino groups on protein fibers, and amino groups on polyamide fibers under appropriate conditions. The production of covalent bonds between them is currently not only used for the dyeing of cellulose fibers, but also used for the dyeing of protein fibers and nylon fibers. Due to the advantages of bright color, complete chromatogram, excellent wet fastness and convenient dyeing, reactive dyes have gradually replaced insoluble azo dyes, direct dyes, sulfur dyes and vat dyes, and have become the main dyes for cotton fabric dyeing. At present, the annual consumption of various dyes for textile dyeing and finishing in the world is about 750,000...

Examples

Embodiment 1

[0029] Put 100ml of a reactive dye printing and dyeing wastewater sample with a maximum absorption wavelength between 530nm and 550nm into a beaker, add 10.5g / l water-containing sulfate flocculant while stirring, stir at a low speed for 1min, and then centrifuge at 2000rpm 8min, the supernatant was taken to measure the absorbance, and the decolorization rate of the scheme was calculated to be 86%.

Embodiment 2

[0031] The above water-containing sulfate flocculant was replaced with 1.5g / l water-containing hydrochloride flocculant, treated in the same way, and the test decolorization rate was 89%.

Embodiment 3

[0033] Put 100ml of a reactive dye printing and dyeing wastewater sample with a maximum absorption wavelength between 530nm and 550nm into a beaker, add 11g / l of water-containing sulfate flocculant, and adjust the pH of the wastewater to 10-11.5 with sodium hydroxide. The decolorization rate of printing and dyeing wastewater is 95% after being treated at ℃ for 10 minutes and then centrifuged at 3000rpm for 6 minutes.

Technical field:

[0001] The invention relates to a method for decolorizing reactive dye printing and dyeing wastewater, which belongs to the technical field of wastewater treatment. Background technique:

[0002] Reactive dyes contain one or more reactive groups in their molecules, which can react with hydroxyl groups on cellulose fibers, amino groups on protein fibers, and amino groups on polyamide fibers under appropriate conditions. The production of covalent bonds between them is currently not only used for the dyeing of cellulose fibers, but also used for the dyeing of protein fibers and nylon fibers. Due to the advantages of bright color, complete chromatogram, excellent wet fastness and convenient dyeing, reactive dyes have gradually replaced insoluble azo dyes, direct dyes, sulfur dyes and vat dyes, and have become the main dyes for cotton fabric dyeing. At present, the annual consumption of various dyes for textile dyeing and finishing in the world is about 750,000...

Examples

Embodiment 1

[0029] Put 100ml of a reactive dye printing and dyeing wastewater sample with a maximum absorption wavelength between 530nm and 550nm into a beaker, add 10.5g / l water-containing sulfate flocculant while stirring, stir at a low speed for 1min, and then centrifuge at 2000rpm 8min, the supernatant was taken to measure the absorbance, and the decolorization rate of the scheme was calculated to be 86%.

Embodiment 2

[0031] The above water-containing sulfate flocculant was replaced with 1.5g / l water-containing hydrochloride flocculant, treated in the same way, and the test decolorization rate was 89%.

Embodiment 3

[0033] Put 100ml of a reactive dye printing and dyeing wastewater sample with a maximum absorption wavelength between 530nm and 550nm into a beaker, add 11g / l of water-containing sulfate flocculant, and adjust the pH of the wastewater to 10-11.5 with sodium hydroxide. The decolorization rate of printing and dyeing wastewater is 95% after being treated at ℃ for 10 minutes and then centrifuged at 3000rpm for 6 minutes.