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Sedimentation (water treatment)

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Sedimentation is a physical water treatment process using gravity to remove suspended solids from water.[1] Solid particles entrained by the turbulence of moving water may be removed naturally by sedimentation in the still water of lakes and oceans. Settling basins are ponds constructed for the purpose of removing entrained solids by sedimentation.[2] Clarifiers are tanks built with mechanical means for continuous removal of solids being deposited by sedimentation.[3] Clarification does not remove dissolved species.[4] Sedimentation is the act of depositing sediment.

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Suspended solids (or SS), is the mass of dry solids retained by a filter of a given porosity related to the volume of the water sample. This includes particles 10 μm and greater.

Colloids are particles of a size between 1 nm (0.001 µm) and 1 µm depending on the method of quantification. Because of Brownian motion and electrostatic forces balancing the gravity, they are not likely to settle naturally.