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In this study, the settling velocity and organic properties of sedimentation-selected mud flocs were experimentally measured to understand the organic properties, settling characteristics, and flocculation mechanisms in the course of settling. It was found that the settling velocity of mud flocs significantly depended on the amount and properties of adsorbed organic matter. Further, the settling velocity of mud flocs is averaged due to the fact that differences of the settling velocities of particles are diminished under the collision and flocculation of particles in the settling process. Finally, the experiment results suggest that the flocculation of particles adsorbed by large amounts of organic matter was electrically difficult to generate; whereas it was facilitated owing to an increasing positive charge surface of particles by elimination of the organic matter.

Settling Characteristics of Mud Carrying Different Floc Structures