Water and Wastewater.com Help Forum - Coagulation vs. Flocculation
flocculation is mostly carried out with polymeric flocculants, in most cases with cationic polyelectrolytes, given that particle surfaces have a net negative surface charge.
Coagulation is a preferred method for water treatment, in wastewater treatment it is mostly used when finely dispersed colloids with lower mass concentration have to be removed. On the other end for sludge dewatering flocculation is preferred.
Poor settling, besides other operational parameters, might be caused by using the wrong flocculant, by under and overdosing as well.
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