The dicyandiamide decolorizing agent is a specialized chemical used in wastewater treatment, primarily designed to remove color and other pollutants from wastewater. This decolorizing agent is based on the reaction product of dicyandiamide and formaldehyde, known as dicyandiamide-formaldehyde resin. It plays a significant role in treating wastewater from dyeing processes, petrochemical wastewater, and municipal sewage. The dicyandiamide-formaldehyde resin decolorizing agent effectively removes dyes, suspended solids, oils, and other contaminants while reducing chemical oxygen demand (COD).
Principle of Action: Dicyandiamide-formaldehyde resin is a high-molecular organic compound formed by the polycondensation of dicyandiamide and formaldehyde under the action of an acidic catalyst, such as hydrochloric acid. This resin possesses strong cationic properties, enabling it to combine with negatively charged dye molecules and other pollutants in wastewater. Sometimes, additional components are introduced as cross-linking agents or modifiers to further enhance the performance of the decolorizing agent. These auxiliary components help adjust the molecular structure and properties of the resin, optimizing its decolorizing effect.
Charge Neutralization and Flocculation: Dye molecules and other pollutants in wastewater often carry a negative charge. The cationic groups in the dicyandiamide decolorizing agent can neutralize these negative charges, disrupting the stability of the dye molecules. After charge neutralization, the dye molecules and pollutants aggregate to form flocs, which can be easily removed through physical methods such as precipitation or filtration.
Usage Method: Add the dicyandiamide decolorizing agent to the wastewater to be treated, stir thoroughly, and adjust the pH. Once flocs appear, add PAM (polyacrylamide) to aid coagulation and precipitation. After a certain period, the formed flocs can be removed through filtration or precipitation. This ensures that the majority of contaminants are effectively removed.
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