A settling tank in a water treatment plant is designed for a surface overflow rate of 30 m3/day.m2 . Assume specific gravity of sediment particles = 2.65, the density of water (ρ) = 1000 kg/m3, dynamic viscosity of water (μ) = 0.001 N.s/m2, and Stroke’ law is valid. The approximate minimum size of particles that would be completely removed is:

A settling tank in a water treatment plant is designed for a surface o

1.	A settling tank in a water treatment plant is designed for a surface overflow rate of 30 m3/day.m2 . Assume specific gravity of sediment particles = 2.65, the density of water (ρ) = 1000 kg/m3, dynamic viscosity of water (μ) = 0.001 N.s/m2, and Stroke’ law is valid. The approximate minimum size of particles that would be completely removed is:
A.	0.01 mm
B.	0.02 mm
C.	0.03 mm
D.	0.04 mm
Answer» C. 0.03 mm

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