Decolorization method of disperse dye production wastewater

Abstract

The invention provides a decolorization method of disperse dye production wastewater. A strong-alkali reagent with good stability and high neutralization capability is used for performing high-efficient decolorization on the disperse dye production wastewater with high chromaticity, strong acidity and high chemical oxygen demand. The decolorization method of the disperse dye production wastewater provided by the invention has the advantages that strong alkali is used for regulating production wastewater until the pH is greater than 5.5; redundant raw materials, residual products and few intermediate byproducts in the wastewater are separated out; then, filtering is performed; the dye wastewater decolorization is realized. The method has the advantages of simplicity, convenience, high speed, high efficiency, cleanness, no secondary pollution and the like; the decolorization rate can reach to 90 percent or higher, and can reach to 96.41 percent to the highest degree. The decolorization of the disperse dye production wastewater is realized; organic matters in the dye wastewater are separated out, so that the chemical demand quantity of the dye wastewater is reduced; the quantity of hazardous wastes in the traditional quicklime neutralizing method is reduced; the technological process of subsequent wastewater treatment can also be reduced, so that the wastewater treatment cost is reduced.

Description

technical field [0001] The invention relates to the technical field of water pollution control and resource utilization, in particular to a decolorization method for disperse dye production wastewater. Background technique [0002] The dye industry has many varieties of dyes, and there are often large differences in the raw materials, production processes, and reaction conditions required by different varieties of dyes. Some residual raw materials and intermediates cause the production wastewater of the dye industry to have complex pollutant components and high chroma. , high COD, strong acidity, high toxicity, difficult to handle and so on. Therefore, the treatment of dye wastewater has always been a major problem in the dye industry. Whether the dye production wastewater can be treated efficiently, environmentally friendly and safely is an important factor restricting the long-term and healthy development of the industry. [0003] The traditional decolorization treatment ...

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a method for decolorizing wastewater from disperse dye production, so as to solve the problem of complex process, high technical requirements, difficult operation and easy secondary pollution in the existing method for processing wastewater produced by the preparation of disperse dyes. etc., the described decolorization method uses a strong base to adjust the dye production wastewater to a pH greater than 5.5, and precipitates excess raw materials, residual products and a small amount of intermediate by-products in the wastewater, and then performs filtration to realize the decolorization of the production wastewater. This method is simple and convenient. , high efficiency, clean and no secondary pollution

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