For dyeing and printing wastewater decolorization of COD commonly used treatment methods and selected agents for the printing and dyeing wastewater decolorization and COD treatment methods commonly used and selected agents recently Caijing environmental documentary "under the dome" has attracted the attention of the community, aroused intense repercussions The positive significance of environmental protection and improvement of people's livelihood is expected to have a significant impact on the secondary market. Investment opportunities in leading secondary companies representing China's environmental protection and emission reduction-related industries will emerge. However, the development of related enterprises and the promotion and application of technology products will The Foundation for Improving the Healthy Development of the Domestic Market - The Chinese Environment Relying on "Same Breath and Total Destiny". Now that the stringent enforcement and requirements of the environmental protection laws across the country have become more and more stringent, most of the industrial waste water has put great pressure on handling. In recent years, the decolorization of wastewater from the textile printing and dyeing industry is a problem. Since some factories are still using traditional processing methods to date and often lead to non-compliance, one of them is the chroma, which is mainly due to the phenomenon of returning to the color after the treatment. It is a headache for factory managers. In addition, improper handling of this item can easily lead to non-compliance and stench of COD in water quality. If untreated, discharge will have a great impact on the lake environment and the biological chain. So, how to deal with this situation? In fact, if the printing and dyeing wastewater after the treatment often return color phenomenon, it should be changed away from the traditional treatment methods, after all, nowadays the printing and dyeing industry, printing and dyeing dyes and auxiliaries are innovating, and the environmental law requires more stringent, The traditional treatment can only be eliminated. Today, the decolorization of COD for dyeing wastewater is commonly used in physical and biological methods. Among them, although biological treatment is better, due to the high operating cost of biological method, some small and medium-sized enterprises simply can not afford the operating costs of treatment. Therefore, the commonly used method is the materialized method, in which the lowest cost is the flocculation sedimentation method , More for wastewater pretreatment, and the reagents used in this step is also an important factor affecting the follow-up treatment effect. Today, in water treatment, flocculation sedimentation treatment so mostly Poly aluminum chloride and polyacrylamide. Mainly due to the combination of these two agents have the advantages of other pharmaceuticals, of which aluminum chloride is among the fourth generation of aluminum salts purifying agent, the use of the treatment effect is the best, the most significant decolorization effect , For the printing and dyeing wastewater through coagulation, the water pollutant suspended solids destabilizing aggregation, the formation of easily flocculation of mud flocs, so as to achieve decolorization effect, and because of some water treatment cohesion effect is not very good, so in the treatment The process will also add polyacrylamide to aid coagulation, but also the small residual suspended solids in the water together coagulation precipitation, which can also COD in water degradation. And if there is back to the phenomenon, there are several possibilities: 1. Improper adjustment of pH of water quality; 2. Polyaluminum chloride dosing excess and so on. If you want to know more about the details, please call the filter water purification consult our technical team goods log on official website http://www.gyzhenyu.com/ to view.