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_________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling.

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_________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling.

(a) BOD loading

(b) Suspended solid volume

(c) Sludge volume index

(d) Organic loading

This question was posed to me in an interview.

The question is from Design of Activated Sludge Plant in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering

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The correct answer is (c) Sludge volume index

Explanation: Sludge volume index is used to indicate the settling behavior of sludge. It is measured in ml/gm.

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