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Why sludge volume index- SVI less than 100 can be seen as operating satisfactorily and SVI greater than 150 can be referred as sludge bulking not the other way around?
Wiki User
∙ 14y ago
SVI is an empirical measurement. In other words, there is no theory that says 100 is the magic number that means sludge should settle satisfactorily. Rather, repeated measurements have found that SVI less than 100 tend to settle well. As filamentous bacteria grow in the sludge, the sludge settles less and less because the filamentous bacteria do not compress well. When this happens, you get a higher SVI. At about SVI = 150, the sludge will bulk and the clarifier will stop operating properly.
SVI = (settled volume of sludge after 30 min in a 1-L graduated cylinder in mL/L)*1000/(suspended solids in the reactor in mg/L)
A larger settled volume or a smaller suspended solids makes the SVI go higher.
Wiki User
∙ 14y ago
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