Transcription of Lecture 4: Sedimentation
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Islamic University of Gaza Environmental Engineering DepartmentWaterTreatmentWater TreatmentEENV 4331 Lecture 4: SedimentationDr. Fahid Rabah14. Sedimentation in water Definition of Sedimentation :It is the process of removing solid particles heavier than waterby gravity force. Particles that will settle within a reasonable period of timecan be removed using a Sedimentation tank (also calledclarifiers). Sedimentationisusedinwatertreatmentatthe locationsindicated in Figures 1 through Sedimentation in water Applications of Sedimentation in water treatment:pp1. Plain settling ( or pre Sedimentation ) of river surfacewater .2. In filtration treatment plants treating surface water toremoves flocculated solids. The Sedimentation tank comesafter the flocculation In Softening treatment plants treating hard water toremoves flocculated solids.
The design procedure for sedimentation tanks of type 2 and 3 are the same as type 1. The difference is mainly in the overflow rate (v 0) .The following table gives the design criteria of these two types. Process Settling type Detention Surface Weir loading time (h) …
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