The common agents used in sewage treatment are color removal agents, which are mainly used for decolorizing high-color wastewater from reactive, acidic, and disperse dyes. They can also be used for decolorizing wastewater from textiles, chemical industry, coking, paper making, printing and dyeing, bleaching, leather, urban sewage, industrial sewage stations, etc.
Color removal agents are water-soluble and, when added to sewage, create a compressed double electric layer that destabilizes the colloidal particles in the sewage, causing them to coagulate into larger particles and sink, thus achieving the treatment effect. By adding color removal agents to sewage, it is possible to remove finely dispersed solid particles, emulsified oil, and colloidal substances, efficiently reducing the turbidity and color of the sewage, removing various high molecular substances such as COD, ammonia nitrogen, and SS, and also removing soluble inorganic substances that can cause eutrophication, such as phosphorus. In addition, it can also improve the dewatering performance of sludge, making it easier for subsequent biochemical treatment and reducing costs by requiring only a small amount of color removal agent.
Color removal agents can be said to be a new type of organic high-molecular compound polymer that uses flocculation and decolorization to effectively remove COD, suitable for treating concentrated and colorful dye and dye intermediate production process wastewater. The principle of color removal agents is to effectively separate and flocculate various types of chromatic bodies in wastewater through reduction and adsorption, effectively treating various forms of chromatic bodies and other pollutants in wastewater. They can be used alone or in combination with common inorganic and organic flocculants or coagulants.
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