Cationic flocculants are co-polymers of acrylamide with increasing proportions of cationic monomers.

Compared with other organic flocculants, cationic flocculant  has high molecular weight, good linearity, high cationic degree and good solubility. Cationic flocculant can not only through adsorption bridging, charge neutralization flocculation, but also can react with the negatively charged suspended particles, generate flocculant precipitate, the floc large and dense, which is beneficial to settling dehydration. Cationic flocculant has very good decolorizing function at the same time, the organic and inorganic substances have very good purification effect, the effective PH range is very wide, less dosage, toxicity is small. It is more suitable for removing fine particles in wastewater and purifying wastewater with high colloid organic matter content. In addition, it can be combined with various inorganic polymer flocculants to form a series of new and efficient inorganic -organic composite flocculants. This new type of composite flocculant not only has the price advantage of inorganic polymer flocculant, but also has the advantages of high stability and good flocculation effect of organic polymer flocculant. Therefore, in the municipal water supply and industrial wastewater treatment, the application of cationic polyacrylamide has become a trend.