Anionic polyacrylamide (APAM) is a water-soluble polymer, mainly used for flocculation and sedimentation, sedimentation and clarification of various industrial wastewaters, such as iron and steel plant wastewater, electroplating plant wastewater, metallurgical wastewater, coal washing wastewater, etc. Mud dehydration, etc. It can also be used for drinking water clarification and purification.