Cationic polyacrylamide (CPAM) is a linear polymer compound. Because it has a variety of active groups, it can form hydrogen bonds with many substances through affinity and adsorption. It is mainly used to flocculate negatively charged colloids and has functions such as turbidity removal, decolorization, adsorption, and adhesion. It is suitable for dyeing, papermaking, food, construction, metallurgy, mineral processing, coal powder, oil fields, aquatic product processing and fermentation and other industries. Organic colloid content High wastewater treatment, especially suitable for dehydration treatment of urban sewage, urban sludge, papermaking sludge and other industrial sludge.