What term describes the aggregation of coagulated particles into larger flocs?

The correct term for the aggregation of coagulated particles into larger flocs is flocculation. This process occurs after coagulation, where smaller particles that have been neutralized and pulled together begin to bond with one another to form larger clusters or 'flocs'. These larger flocs can more easily be removed from water through subsequent treatment processes, such as sedimentation or filtration.

Coagulation refers specifically to the process of destabilizing the fine particles in water so that they can adhere to one another, while filtration is a method used to remove particles from the water after all treatment processes. Settling involves the gravitational separation of flocs from the water column, but it is a separate step that occurs after flocculation has resulted in sufficient floc size for removal. Thus, flocculation accurately describes the stage of the aggregation of particles, making it the appropriate choice in this context.