Polymer Selection for Thickening
Cationic polymer charge density and molecular weight both need to match the specific sludge type being thickened.
Primary sludge, waste activated sludge, and digested sludge each carry different surface charge characteristics, requiring different polymer chemistries for effective flocculation.
A polymer that performs well on WAS may underperform on digested sludge, so a change in feed sludge composition often requires re-evaluating polymer selection, not just dose.
Vendor jar testing across multiple polymer products, not just dose variations of a single product, is worth doing periodically as feed sludge character shifts.
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