Decolouring method of printing and dyeing waste water

Abstract

A process for decoloring the dyeing and printing waste water includes such steps as regulating pH value to be come acidic, adding natural MnK ore particles, selectively adding dielectrolyte calcium nitrate and illuminating, and stirring while reacting for several hr. Its advantages are high effect, low cost, no secondary pollution, and cyclic use of the said MnK ore.

Description

Technical field: [0001] The invention belongs to the technical field of wastewater treatment, in particular to a decolorization method for printing and dyeing wastewater. Background technique: [0002] Today, the annual output of synthetic dyes in the world is about 1 million tons, of which my country accounts for about 20%. Most of the raw materials input into dye production are aromatic compounds and heterocyclic compounds, so that most of the wastewater discharged during the production process is organic matter with aromatic groups such as benzene, naphthalene, anthracene, and quinone as the parent, with chromogenic groups, The color is very dark, with a chroma of 500-500,000, and has a strong sense of pollution. If it is discharged directly, it will cause serious pollution to water sources. Therefore, it is of great significance to study the treatment of dye wastewater to protect the ecological environment and human health. At present, the commonly used dye wastewater ...

AI Technical Summary

Problems solved by technology

However, these methods generally have the disadvantages of high cost, short timeliness and secondary pollution.

[0003] At present, most of the researches on the degradation of printing and dyeing wastewater by manganese oxides at home and abroad are artificially synthesized products, and there are no reports on the oxidative degradation of printing and dyeing wastewater by using natural manganese potassium ore.

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