Sewage special use properties polyacrylamide flocculation: PAM allows suspended material by charge neutralization, bridging adsorption, since flocculation. Adhesion: through mechanical, physical, chemical effect, since adhesiveness. Drop resistance: PAM can effectively reduce the fluid friction, can be added to the water trace PAM 50-80% reduction in resistance. Thickening: PAM have thickening effect in neutral and acidic conditions, when the PH value above 10 ° C PAM easy hydrolysis, was semi-mesh structure, thickening more obvious. For sewage treatment polyacrylamide Principle Introduction: flocculation principle: PAM for flocculation, the flocs species with the surface properties, especially the PH value zeta potential, viscosity, turbidity and suspension related to zeta potential of the particle surface, inhibitor particle surface charge of the reasons to join the opposite PAM, can snap the potential decrease in cohesion. Adsorption bridging: PAM molecular chains immobilized on the surface of different particles, forming bridges between the polymer particles, the particles form aggregates and sedimentation. Adsorption: Adsorption of polar groups of various particles PAM molecule. Enhancement: PAM molecular chain and dispersed through a variety of mechanical, physical, chemical and other effects, the dispersed phase implicated together to form a network, thereby enhancing the role play.