SSC JE Civil Engineering 25-Sep-2019 Shift 1 Solved Paper

Question : 139 of 200

Marks: +1, -0

A water treatment plant has a flow rate of 0.6 m

^{3}

/s. The settling basin at the plant has effective settling volume dimensions of length 20 m, depth 3 m, and width 6 m. What percentage of the particles having a settling velocity of 0.004 m/sec is removed?

75%
92%
80%
100%

Validate

Solution:

As given that,
The volume = 20 × 3 × 6 = 360m

^{3}

Surface Area = 20 × 6 = 120m

^{2}

Time for particle remain in tank =

360/0.6

= 600 sec.
Now, Depth travel by particle = 0.004 m/s × 600 = 2.4m.
Now net % of the particle having a setting velocity is :
=

2.4/3× 100 = 80%.

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