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The moisture content of sludge is reduced from 90 to 80...

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Waste Water Engineering
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The moisture content of sludge is reduced from 90% to 80% in a sludge digestion tank. The percentage decrease in the volume of sludge, is

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Correct Answer: Option B
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Atif Muneer
Atif Muneer 5 years ago
Initial = 90%.
Final = 80%.

V2/V1 = (100 - Initial) / (100- Final).
= 100 - 90 / 100 - 80,
= 10 / 20,
= 1/2.

For % multiply by 100.
Ans is 50%.
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