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.
It is used to indicate the physical state of the sludge produced in biological aeration system.
It represents the degree of concentration of the sludge in the system, and it is determined experimentally.
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