Dye production wastewater containing acid, alkali, salt, halogen, hydrocarbon, amine and nitro and substances such as dyes intermediates, some still containing pyridine, melamine, phenol, benzidine and heavy metals such as mercury, cadmium, chromium.
The waste water is complex in composition.
Toxic and difficult to treat.
Therefore, the treatment of dye production wastewater.
The characteristics and discharge requirements of waste water should be considered.
Choose the appropriate treatment.
For example, coagulation and filtration can be used to remove solid impurities and inorganic substances.
Chemical oxidation, biological method and reverse osmosis method are used to remove organic matter and toxic substances.
The decoloring process can be made up of coagulation method and adsorption method, and the ion exchange method can be used to remove heavy metals