The treatment process is mainly combined treatment of physicochemical-biological-membrane method

BOD: organic matter, such as dyes, slurries, surfactants, ester phenols, processing chemicals, etc.;

COD: dyes, reducing bleaching agents, aldehydes, starch finishing agents, etc.;

Heavy metals: copper, lead, zinc, mercury, cyanide ions, etc.;

Chroma: Dyes, Pigments

The printing and dyeing wastewater treatment process is mainly based on biological methods, supplemented by physical methods and chemical methods.

The common treatment methods of printing and dyeing wastewater can be divided into three categories: physical method, chemical method and biological method. Coagulation, electrolytic oxidation, adsorption, mildew elimination, etc. Biological methods include anaerobic biological method, aerobic biological method, and facultative biological method.

Chemical wastewater refers to the wastewater generated in the production process of chemical products. The classification is more complicated. The types of wastewater generally include production sewage, cooling water, flushing water and domestic sewage.

It contains industrial production materials, intermediate products, by-products and pollutants generated in the production process that are lost with wastewater.