Anionic flocculants are co-polymers of acrylamide with increasing proportions of acrylate groups.Among organic polymer flocculants, anionic flocculant (APAM) is a kind of water-soluble polymer with the longest development history, the most mature technology and the most extensive application. 

Anionic flocculants can produce higher molecular weight than cationic flocculant(CPAM) products, mainly used for flocculation settlement of various industrial wastewater, precipitation and clarification treatment, such as papermaking, mineral processing, oil extraction, steel plant wastewater, metallurgical wastewater, coal washing wastewater and other sewage treatment, sludge dehydration. It can also be used for drinking water purification treatment. Due to its macromolecule chain contains a certain amount of active amide groups. It can through the adsorption of solid particles suspended in water, make the bridge between particles or by charge neutralization will be condensed to form larger particles flocculate. It can accelerate particle in the slurry settlement. It has very obviously effect of accelerating the solution clarifies and improving the filtration.