Sludge volume index is defined as the ratio of

A Percentage of sludge by volume to percentage of suspended solids by weight
B Percentage of sludge by volume to percentage of total solids by weight
C Percentage of suspended solids by weight to percentage of sludge by volume
D Percentage of total solids by weight to percentage of sludge by volume

Correct Answer: Percentage of sludge by volume to percentage of suspended solids by weight

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