Sludge Volume Index (S.V.I) – Formula

Sludge Volume Index (SVI) – Formula

The term sludge volume index or sludge index is defined as the volume occupied in ml by one gm of solids in the mixed liquor after settling for 30 minutes.

Sludge Volume Index (S.V.I) - Formula

It is used to indicate the physical state of the sludge produced in the biological aeration system.

It represents the degree of concentration of the sludge in the system, and it is determined experimentally.

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