The application efficiency of ozone catalyst from printing and dyeing wastewater treatment

Printing and dyeing industry is a major industrial wastewater discharge, printing and dyeing wastewater composition is complex, great harm to the environment. The main pollution sources of printing and dyeing wastewater come from dyes, auxiliaries and so on. There are many kinds of dyes with complex structure, containing a large number of organic groups such as benzene ring and naphthalene ring, which are difficult to biodegrade. The additives contain a large number of surfactants, salts, etc., which further increases the difficulty of wastewater treatment.
If printing and dyeing wastewater is discharged directly without effective treatment, it will lead to serious consequences. High chroma in wastewater will affect the light transmittance of water, hinder the photosynthesis of aquatic plants, and destroy the aquatic ecological balance. A large amount of refractory organic matter will consume dissolved oxygen in the water, resulting in the death of aquatic organisms such as fish. In addition, some harmful substances may be enriched through the food chain and eventually endanger human health.
Ozone catalyst plays a key role in the treatment of printing and dyeing wastewater. Its application mechanism is based on the strong oxidation of ozone. Under the action of catalyst, ozone can produce more hydroxyl free radicals (· OH). The hydroxyl radical has a very high oxidation potential, which is more oxidizing than ozone itself. These free radicals can react with organic matter in printing and dyeing wastewater, decompose macromolecular organic matter into small molecules, and destroy the color base group of dyes, so as to achieve the purpose of decolorization and degradation of organic matter. The catalyst can reduce the activation energy of hydroxyl radical generated by ozone decomposition and improve the reaction efficiency, so that ozone can play an efficient oxidation role under relatively mild conditions.