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The high rate sludge digestion tanks are used when the capacity of the tank is ____ million liters per day.

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The high rate sludge digestion tanks are used when the capacity of the tank is ____ million liters per day.

(a) 1

(b) 3

(c) 4

(d) 10

I had been asked this question in an online interview.

Query is from Digestion of Sludge, Sludge Digestion Tank topic in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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Best answer
The correct answer is (c) 4

Explanation: High rate digesters are used when the capacity of tank is 4 million litres per day. Complete mixing and uniform feeding of raw sludge take place in high rate digesters.

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