同海大学 Tongji University 2.Flocculent settling Particles in a rather dilute suspension flocculate during the settling operation,resulting a increase in particle mass and a faster settling velocity For example,the removal of TSS in untreated wastewater in primary settling facilities,and in upper portions of secondary settling facilities,also the removal of chemical floc in settling tanks.Tongji University 2. Flocculent settling Particles in a rather dilute suspension flocculate during the settling operation, resulting a increase in particle mass and a faster settling velocity. For example, the removal of TSS in untreated wastewater in primary settling facilities, and in upper portions of secondary settling facilities, also the removal of chemical floc in settling tanks