The Taylor Tutorial - Florida Rural Water Association

Sedimentation1. Settling of Larger Size Particles• Sand• Heavy silts• Removed by slowing down flow and allowing simple gravity settling• These are settleable solids2. Sedimentation Considerations• Sedimentation – The settling rate of a particle becomes much slower as thetemperature drops. The colder the water temperature becomes, the longer theparticle takes to settle out.• When water becomes colder, perform jar tests and adjust coagulant dosage toproduce a heavier floc and thus a faster settling floc.• The settled materials from coagulation or settling are referred to as sludge,and slurry refers to the suspended floc clumps in the clarifier. Sometime theterms sludge and slurry are use interchangeably.19