Civil Engineering > GATE 2025 SET-1 > Water Treatment
The Surface Overflow Rate (SOR) in a rectangular sedimentation tank is 45 m3/m2/d. Minimum diameters of spherical inorganic and organic particles expected to be completely removed in this tank are calculated. Assume that Stoke's law is applicable. Which of the following options is/are correct:
Specific gravity of inorganic particles =2.65
Specific gravity of organic particles =1.20
Acceleration due to gravity (g)=9.81 m/s2
Kinematic viscosity (ν)=1×10-6 m2/s
A
Minimum diameter of inorganic particles is 24 μm
B
Minimum diameter of organic particles is 69 μm
C
Minimum diameter of inorganic particles is 15 μm
D
Minimum diameter of organic particles is 55 μm

Correct : a

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