Since discharge limits are becoming stricter for industrial wastes, textile manufacturers are searching for sufficient and economical methods of pollution reduction.
This is typical of the situation facing the textile industry, especially in the area of color pollution emitted into the earth's waterways. Ozone treatment for remove color from wastewater could be a solution to the problem of color pollution.
Color removal is achieved to a remarkable degree using ozone.
Ozone also can aid in removing some other pollutants like surfactants and carriers that are commonly found in textile wet processing wastewaters.
The processing of waste at its source is a new approach to waste treatment.
Color removal is a prime example of the advantages of this method. Color removal immediately allowing the dyeing process.
Increases the efficiency and the economics of ozonation and could
become the ideal treatment method Ofthe twenty-first century.
Ozone removes the color from textile wastewaters by oxidizing or breaking up the complex compounds and chromophores that form dyes used to color natural as well as synthetic fibers and fabrics.
The color is removed when the ozone cleaves the -C=C- bonds,
the -N=N- bonds and heterocyclic and aromatic rings.
The absorption of light by these bonds is shifted from the visible region to the ultraviolet or infrared region of the spectrum.
Reactive dyes are degraded to the greatest extent by ozonation. The wastewater from a printing dye works was treated to 95% decolorization.