Due to the intermittent production of coatings, the main source of wastewater is washing water from washing equipment and production sites. For general comprehensive coating production enterprises, the wastewater contains pigments, fillers, resins, solvents, mineral oils, vegetable oils, saponification agents, alkalis, and other substances. The discharge of wastewater is irregular and periodic, and the content of pollutants in the wastewater varies greatly, which increases the difficulty of wastewater treatment. If wastewater is discharged directly into the sewer without treatment, it will cause a series of consequences: the solid pigments in it will increase the turbidity of the water, hinder the transmission of sunlight in the water, and thus affect the photosynthesis of plants in the water; The biodegradation of surfactants and cellulose thickeners in wastewater increases oxygen consumption and reduces the concentration of oxygen in water, which poses a threat to the survival of fish and other aquatic organisms.
The composition of pollutants in paint wastewater is complex, with high concentration of pollutants, high COD, high chromaticity, and high suspended solids content. The water also contains toxic organic substances such as phenolic aldehyde and benzene. The dispersion of water volume is large, making it difficult to treat paint wastewater and resulting in high treatment costs.
Paint wastewater decolorizing agent is a coagulant decolorizing water treatment agent. By adding a decolorizing agent, the colloidal particles and small suspended solids in the wastewater are aggregated to form a large volume, high density, and fast settling flocculent, thereby removing the small suspended solids and colloidal particles in the wastewater, reducing the chromaticity, COD, and other pollutants. The treated wastewater can meet the discharge standards.