In today's era where environmental protection concepts have taken root in people's hearts, water-based paints, with their advantages of using water as a diluent, being free from organic solvents, and being non-toxic and odorless, are widely used for surface coating of various materials such as wood, metal, and plastic. However, during the production and use of water-based paints, a large amount of wastewater is generated, including mixing and stirring wastewater from the manufacturing process, equipment cleaning wastewater, and inspection wastewater. These wastewaters not only contain pigments and solvents but also are rich in various hard-to-degrade organic compounds, displaying vibrant colors. If discharged without treatment, they will cause severe pollution to soil and water bodies, threatening biodiversity and human health
Water-based paint decolorizers have emerged as a key solution to this problem. In terms of type, they generally consist of additives, water-based paint separators, and flocculants. Additives can be divided into inorganic mixtures and organic types, primarily serving the function of coagulation; water-based paint separators are cationic polymer composites that react with components in the paint that are difficult to separate, achieving separation; flocculants mainly consist of polyacrylamides with different degrees of polymerization and ionization, including anionic, cationic, and modified amphoteric types, which should be selected based on the actual conditions of the wastewater.
Its mechanism is multifaceted. Under the flocculation sedimentation process, decolorizers react with pigment particles in wastewater to form large flocs that settle and separate. Cationic groups in some flocculants can bind with pigment anions, promoting precipitation. In terms of physical adsorption, decolorizer materials with a large specific surface area can adsorb dyes and organic compounds from water, reducing color intensity. Some decolorizers containing activated carbon components work in this way. Some highly efficient decolorizers also utilize redox reactions to convert colored substances into colorless or low-color substances, thereby reducing water color, such as using strong oxidizing agents to disrupt the molecular structure of pigments
When using, first adjust the pH of the wastewater to neutral, add a decolorizing agent to break the original structure of the wastewater, then add polyacrylamide to make the paint coagulate into large floc particles, achieving separation of impurities from water. The supernatant can be reused or discharged up to standard. Water-based paint decolorizers have significant advantages; they can efficiently remove color from wastewater and reduce chemical oxygen demand (COD). Moreover, the process is simple and adaptable, helping companies achieve wastewater purification and promoting green development in the industry.
FREE SAMPLE PLS CONTACT Vivian Whatsapp 86 13790671695 viviansun@san-mei.com
中文
English
