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Question
What will be the Sludge Volume Index (SVI) (ml/gram) if 100 ml of sludge collected in 30 mins on drying weighs 800 mg?
A.
125
B.
8
C.
0.008
D.
0.125
Answer ( Option A)

125

Solution

Sludge volume index is the volume occupied in mL by one gm of solids in the mixed liquor after settling for 30 minutes. 
The recommended value of the Sludge Volume Index (SVI) for municipal sewage is approximately lying in the range of 80 to 150.
Calculation: 
Given, 
Volume of settled sludge = 100 ml, Drying weight (MLSS) = 800 mg

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