Flocculation is the process by which the organic polymer flocculant has a high molecular weight and linear structure as well as a moderate charge density, and the molecular structure, ionic morphology, strength and distribution of the particles in the suspension (or colloid) by the electron neutralization and adsorption bridging.
Molecular weight and distribution and the degree of support will have an effect on the flocculation effect, for a given suspension characteristics of the synthesis of the exact structure of the flocculant, so that the formation of the Flocculant product serialization is the common task of scientific research workers. The sludge dewatering and regulating treatment of municipal sewage treatment plant is an important aspect of the application of organic polymer flocculant, the sludge is divided into raw sludge (primary sedimentation sludge and residual sludge) and digested sludge, and the organic polymer flocculant should be selected according to the type and nature of sludge. When the sludge is vss/ss (the proportion of organic matter in SS) is higher, the flocculant with high cation degree should be selected and the amount of flocculant should be increased. When the SS concentration is high, the flocculant should be used when the SS concentration is low, and the low molecular weight flocculant can be selected when the density is lower. Sludge ph high (digestion sludge), Should choose the functional group as quaternary ammonium structure flocculant, ph low, tertiary amine and quaternary ammonium structure of the flocculant can be used.