L8_Clarificationwater

L8_Clarificationwater - Clarification(Settling A EVEG 3110...

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Clarification (Settling) A EVEG 3110 Lecture Malone: 3/13/03
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Clarification Objectives Water Treatment As a pretreatment to sand filtration Source waters Flocculated waters-turbidity removal Flocculated waters-softening Flocculated waters-iron removal
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City of New Orleans – Carrollton Sewerage and Water Board of New Orleans Sedimentation Chlorine Contact Screen Coagulation Basin Flocculation Basin Polyelectrolyte Ferric Sulfate Lime Rapid Sand Filters (44) Sodium Hexametaphosphate Fluorosilicic Acid Free Chlorine Anhydrous Ammonia M i s s i s s i p p i   R i v e r Finished Product Water (125 MGD)
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10 -4 10 - 3 10 -2 10 -1 1 10 100 Dissolved Colloidal Suspended Clarification Solids Particle sizes Filtration Coagulation Flocculation
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# Settling Classes Type I: Discrete (Free) Settling Particles fall independent of each other Type II: Flocculent Settling Intra particle interference Type III: Zone (Compression) Particles rest on each other
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I II III Discrete Flocculent Compression Tchobanoglous & Schroeder 1987
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Theory –Type I Tchobanoglous & Schroeder 1987
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Theory –Type I Tchobanoglous & Schroeder 1987
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Theory –Type I Tchobanoglous & Schroeder 1987
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Theory –Type I Tchobanoglous & Schroeder 1987
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Theory –Type I Generic Steady-state Solution
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Theory –Type I Tchobanoglous & Schroeder 1987
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nd Edition
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Theory –Type I Stokes Law For Low Reynolds Numbers <0.3
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This note was uploaded on 05/20/2010 for the course EVEG 3110 taught by Professor Malone during the Spring '10 term at LSU.

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L8_Clarificationwater - Clarification(Settling A EVEG 3110...

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