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T3 - CIVL 242 TUTORIAL 3 So([email protected] Kin([email protected]

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CIVL 242 TUTORIAL 3 So ([email protected]) Kin ([email protected])
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Mixing Theory 2 1 ) ) μ ( Viscosity ) V ( basin mixing of Volume ) P ( input Power ( dx dv G = = Velocity gradient (G) the relative velocity ( v ) of two water elements divided by the relative distance ( x) of them, can be calculated as:
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Mixing Theory
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Rapid Mixing & Flocculation
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Horizontal Flocculator Arrangement Parallel to flow: Perpendicular to flow: (Droste, 1997)
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Factors of Flocculation - Gt Large G and small T give small but dense flocs Small G and large T give bigger but light flocs Large & dense flocs - which can be obtained by designing flocculator with different G values 1 2 3
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Flocculator Design 2 2 p p D v A C D ρ = 2 3 p p D v A C P ρ = 2 1 3 ) 2 ( μ ρ V v A C G p p D = 1. 2. 3. ) ( tip paddle at velocity ) ( force Drag ) ( input Power p v xWater D P = 2 1 ) ) μ ( Viscosity ) V ( basin mixing of Volume ) P ( input Power ( dx dv G = = V, V & A
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Flocculator Design 1. Gt = 10 -10
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Example: Determine the theoretical power requirement to achieve a G value of 100/s in a tank with a volume of 2800 m 3 . Assume that the wastewater temperature is 15 o C. What is the corresponding
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