Analysis Of Printing And Dyeing Wastewater Treatment Equipment In 2016

Nowadays, with the rapid development of China's economy, Textile printing and dyeing industry The volume of drainage increased considerably. According to incomplete statistics, the annual discharge of printing and dyeing wastewater in China is about 20 billion tons, ranking fifth of the total industrial wastewater discharge in China. The resulting environmental damage and huge economic losses. China's textile printing and dyeing are mostly small and medium-sized private enterprises, scattered scattered, waste water is not easy to concentrate on processing, and the overall production level is not high, the volume of pollutants per unit product is more than twice that of the developed countries. Small and medium-sized enterprises, because of their small scale of production, are greatly influenced by the market. Dyeing workshop Generally speaking, intermittent production, or small quantity and rapid change of orders, and great fluctuation of water quality make the sewage treatment system unable to operate stably and effectively. Because small and medium-sized enterprises are generally unable to bear the investment and operation cost of sewage treatment system, most of their wastewater has not been effectively managed, resulting in serious environmental pollution.

　　 There are many researches on the reuse of printing and dyeing wastewater in China.

(1) most of the reuse technologies are in the pilot study stage, mostly for small and pilot tests. The actual engineering application is less, and the water reuse rate is low, generally not more than 50%. The highest recovery rate of our company can reach about 70%, which is mainly used in the preceding process of low water quality requirement, and there is a lack of the promotion and application of high efficiency technology which is conducive to improving the water quality and reuse rate of reclaimed water.

(2) reuse treatment is mainly based on the treatment of printing and dyeing wastewater on the basis of standard treatment, so as to achieve the quality standard of reclaimed water. Coagulation, adsorption, filtration and oxidation are used in the treatment process, and the key technologies for removing salinity and hardness are few.

(3) due to the limitation of the existing technology level, printing and dyeing A large number of wastewater reuse will bring a series of problems to the production and wastewater treatment system, including the accumulation of organic pollutants and inorganic salts. At present, there are few studies on the long-term reuse of wastewater and the impact on the water treatment system, especially the accumulation of inorganic salts.