Dyeing wastewater has the characteristics of a large amount of water, high content of organic pollutants, large alkalinity, and large changes in water quality. It is one of the difficult industrial wastewater. The wastewater contains dyes, slurries, additives, oils, acids, alkalis, and fibers, impurities, sand substances, inorganic salts, etc. The main methods used in the treatment of printing and dyeing wastewater include physical and chemical methods, biochemical methods, chemical methods, and a combination of several processes. The pretreatment in wastewater treatment is mainly to improve the quality of wastewater and remove suspended solids and impurities that can be directly settled. Adjust the quality and quantity of wastewater, reduce the temperature of wastewater, etc., improve the overall effect of wastewater treatment, and ensure the stability of the entire treatment system. Therefore, pretreatment plays an extremely important role in the treatment of printing and dyeing wastewater.
Typical process flow:
Dyeing wastewater—grating—balance tank—coagulation sedimentation tank— Anaerobic tank—Anoxic tank—Aerobiotic tank—MBR —Treated Water tank