The water content of activated sludge is usually above 95%. These charged sludge exist as fine particles. To make it destabilize, flocculate and dehydrate, a large amount of flocculant needs to be added during the flocculation process. Common flocculants include inorganic flocculants and organic flocculants. The addition of inorganic flocculants not only consumes large amounts of medicament, but also has a large amount of sediment, and the treatment effect is not good. In recent years, it has been gradually replaced by organic flocculants. At present, cationic polyacrylamide is mainly used by most manufacturers. Other points in the process are less dosage, good sedimentation performance, and low water content of the mud cake.

In recent years, some domestic manufacturers have begun to conduct a lot of research on Poly(Dimethyl diallyl ammonium Chloride) . Poly(Dimethyl diallyl ammonium Chloride) is a cationic organic polymer with dimethyldiallylammonium chloride as the main body. It has good water solubility, and the aqueous solution is neutral. After medium ionization, a positively charged quaternary ammonium salt linear action group is produced. In addition to the bridging and roll sweeping functions of general polymer flocculants, it also has quite strong electrical neutralization capabilities. The flocculation principle is that polymer cationic groups attract negatively charged sludge ions to reduce and neutralize the surface charge of colloidal particles, and at the same time compress the colloidal diffusion layer to make the particles agglomerate and destabilize, and with the help of polymer chains The adhesion and bridging effect of the coagulation caused flocculation and settlement. After studying the sludge dewatering performance of dimethyldiallyl chlorinated hinge homopolymerization and copolymerization products, experiments show that this type of flocculant has good sludge dewatering performance.