Anionic polyacrylamide (APAM) is a water-soluble polymers, mainly used for a variety of industrial wastewater settling flocculation, sedimentation clarification treatment, such as iron and steel plant wastewater, electroplating factory wastewater, wastewater metallurgy, coal washing waste water sewage treatment, sewage sludge dewatering. Can also be used for drinking water clarification and purification. Because of its molecular chain containing a certain amount of polar groups, it can through adsorption of suspended solid particles, so that between the particles or by charge neutralization and bridging the particles agglomerate to form large flocs, it is possible to accelerate the particles in the suspension The settlement, there is a very significant speed up the solution is clear, promote filtering effect.