Flocculation sedimentation is the process of flocculation and sedimentation of particles in water. After the coagulant is added to the water , the colloids and dispersed particles of the suspended solids form flocs under the interaction of molecular forces , and they collide with each other during the sedimentation process, and their size and mass continue to increase, and the sedimentation speed continues to increase . The removal rate of suspended matter not only depends on the sedimentation rate, but also on the sedimentation depth. The flocculation and sedimentation of the alum blooms formed after adding coagulant to the surface water, the organic suspended solids in the domestic sewage, and the activated sludge will occur during the sedimentation process.

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