Sedimentation
Sedimentation is a physical treatment process that separates suspended solids from water using gravity. There are four types of sedimentation processes. Type I involves discrete settling of low particle concentrations, Type 2 is flocculant settling of higher solids concentrations, Type 3 is hindered settling of suspensions with high solids concentrations, and Type 4 is compression settling of suspensions with extremely high solids concentrations requiring compression for further sedimentation. Each type describes specific characteristics of particle settling in water treatment applications.
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Presentation Transcript
Sedimentation is a physical treatment process that utilize a gravity separate suspended soilds from water. In general, there are four types of sedimentation:
Type I : known as discrete setling describes the sedimentation of low concentration of particles that settle as individual entities. Un this type of settling the particles settle unhindered at a constant velocity through water.
Type 2 Known as flocculant settling, describes sedimentation of larger concentration of solids that agglomerate as they settle. The particles begins to settle as discrete particles but their concentration is sufficiently high to ensure particle collision.
Type 3 Known as hindered settling describes the sedimentation of a suspension with solids concentration sufficiently high to cause the particles to settle as a mass e.g. the upper portion of the sludge blanket behave like type 3
Type 4 Known as compression settling , describes the sedimentation of suspension with soilds concentration so high that the particles are in contact with an another and further sedimentation can occur only by compression of the mass