Printing and dyeing wastewater has complex components and often contains a variety of dyes. It is dark in color, highly toxic, difficult to degrade, has large value fluctuations, and has high concentration and large amounts of wastewater. It is one of the industrial wastewaters that is difficult to treat. Water treatment agents are widely used in printing and dyeing wastewater, and there are many types, so it is critical to select the appropriate agent in the application. Currently, green chemistry provides us with methods to make full use of resources and energy, reduce costs, and contribute to the sustainable development of mankind. > Polyacrylamide for printing and dyeing factories is a composite polymer. It can effectively clarify the coal washing water, make the fine particles in the water quickly agglomerate and settle, and increase the recovery amount of peat, thereby achieving the effects of saving water and preventing pollution. The problem of sludge disposal produced by printing and dyeing wastewater is a headache for manufacturers. Printing and dyeing sludge generally has high inert substances. For example, the sludge produced by denim garment washing and bleaching wastewater has a high sand content, but low content of organic matter, pathogenic bacteria, etc., and has a low calorific value. It is also low and generally has high heavy metal content (compared to sludge produced from urban domestic sewage). Since the printing and dyeing industry itself produces different sludge compositions due to different raw materials, product varieties, product processing methods, etc., companies that use sulfur dyes are bound to have higher sulfide content. Therefore, the selection and dosage of chemicals during printing and dyeing sludge treatment need to be treated differently according to the source of sludge, starting from the scale of sewage treatment, sludge output, chemical sources, chemical dosage, operating costs, mud cake moisture content, etc. Adapt measures to local conditions and take comprehensive considerations.
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