T4 - Tutorial 4 TA Pang Shing Kin([email protected] So Wing...

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Unformatted text preview: Tutorial 4 TA: Pang Shing Kin ([email protected]) So Wing Kin ([email protected]) CIVL 242 Water and Wastewater Engineering Settling/ Sedimentation/ Clarification Type Description Examples I. Discrete Settling Individual, discrete particles settling, dilute suspension/ low concentration. grit, sand II Flocculation Settling Dilute suspension, particles flocculate, mass and settling rate of flocs increase with depth primary and upper secondary settlers III. Zone/ Hindered Settling Intermediate concentration, mass settles as a unit, interface at top secondary clarifiers IV. Compressing Settling High concentration, structure formed, compression causes settling Sludge thickening Experimental Method – Column Test :- Dilute Suspension with Particle Interaction- Mechanisms of Interparticle Contact Brownian Motion (minor) Fluid Motion (minor) Differential Sedimentation (Maximize)- Particles grow with time and settle faster. Thus, removal is dependent upon depth....
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This note was uploaded on 09/13/2011 for the course CIVL 242 taught by Professor Gh during the Fall '09 term at HKUST.

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T4 - Tutorial 4 TA Pang Shing Kin([email protected] So Wing...

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