Textile and dyeing wastewater is a kind of refractory industrial wastewater, which has the characteristics of complex composition, high organic concentration, deep and changeable color, great changes in PH value and water quantity and quality. Especially, the organic biochemistry of PVA slurry, rayon alkali, new fuels and additives in water is poor, and it is difficult to remove them by common methods. In view of the above situation, through exploration and practice, the company has developed "coagulation method", "adsorption method", "ultraviolet irradiation method", "electrolysis method", "membrane treatment method" and so on, which effectively solved the difficult problem of textile printing and dyeing wastewater treatment.