Textile printing and dyeing wastewater has the characteristics of water, high concentration of organic pollutant, alkaline, water quality variation and so that is difficult to deal with industrial wastewater, wastewater containing dyes, sizing agents, additives, oil agent, acid and alkali, fiber impurities, sand substance, inorganic salt. Currently used for the main method of printing and dyeing wastewater treatment with physical and chemical method, biochemical method, chemical method and several process combined with processing method, and pretreatment of wastewater treatment is mainly in order to improve the water quality of wastewater, the removal of suspended solids and direct deposition of impurities, regulating water water quality and water, reduce water temperature, improve the wastewater treatment effect, ensure the stability of the whole processing system, therefore the preconditioning has the extremely important status in the treatment of printing and dyeing wastewater
