Anionic polyacrylamide (APAM) is a water-soluble polymer, mainly used for all kinds of industrial wastewater flocculation settlement, precipitation clarification treatment, such as: iron and steel plant wastewater, electroplating plant wastewater, metallurgical wastewater, coal washing wastewater and other sewage treatment, sludge dewatering, can also be used for drinking water clarification and purification treatment.