Water and Wastewater.com Help Forum - Old sludge/young sludge dewaterability?
sludge age - dewaterability relation is very complex. There are certainly differences between activated sludge and digested sludge. It well might be that after an initial degradation in dewaterability of activated sludge this will improve again.
The point with the extracellular polymers is that these will also consume polyelectrolyte.
So with activated sludge I suppose the problem is the release of the extracellular polymers, which later might be consumed by bacteria (leading to an improvement then).
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