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...

AI Technical Summary

Problems solved by technology

Most printing and dyeing factories use a combination of chemical treatment and biochemical treatment. Biochemical treatment uses microbial methods to degrade dye molecules and organic matter, but the degradation rate of harmful molecules in the biochemical treatment process is low, equipment investment is large, and operating costs are high. Therefore, choose a simple Economical and effective treatment methods become the focus of research on decolorization of printing and dyeing wastewater