The efficiency of a settling tank can be increased by

Increase in depth of tank

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Decrease in depth of tank

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Increase in surface area of tank

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Decrease in surface area of tank

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Solution

The correct option is D Decrease in surface area of tank
Efficiency of tank $= \frac{V_{0}}{V_{s}} \times 100$
$V_{0}$ overflow rate is inversely proportional to surface area $(V_{0} = \frac{Q}{B L})$ . Therefore, efficiency of settling tank can be increased by reducing the surface area of tank.

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