How does Cationic Polyacrylamide work in sludge dewatering?
2026-04-14 10:37:20
Cationic Polyacrylamide(CPAM)works through charge neutralization,adsorption bridging,and floc densification to turn fine,watery sludge into rigid,dewaterable flocs that release water easily under mechanical pressure.
Charge Neutralization
Sludge particles are mostly organic colloids with strong negative surface charges,which keep them dispersed and stable.
CPAM carries a high positive charge density that rapidly neutralizes these negative charges,eliminating repulsion between particles.
Adsorption Bridging
Long polymer chains of CPAM adsorb multiple sludge particles at the same time,linking them together to form large,compact flocs.
This creates a stable network structure that resists breaking during shearing in centrifuges,belt presses,or filter presses.
Free Water Release
As flocs form and condense,large amounts of interstitial free water are separated from the sludge.
Under mechanical pressure,the dense flocs continue to expel water,resulting in low-moisture sludge cakes and clear filtrate.
Improved Mechanical Dewatering
The tough,shear-resistant flocs allow dewatering equipment to operate more efficiently,
reducing sludge moisture content significantly and lowering transportation and disposal costs.
References
GB/T 7714
Liu Y,Zhang Q,Wang H.Flocculation mechanism of cationic polyacrylamide in sludge dewatering.Environmental Engineering,2021,39(4):102–106.
MLA
Liu,Y.,Q.Zhang,and H.Wang."Flocculation Mechanism of Cationic Polyacrylamide in Sludge Dewatering."Environmental Engineering,vol.39,no.4,2021,pp.102–106.
APA
Liu,Y.,Zhang,Q.,&Wang,H.(2021).Flocculation mechanism of cationic polyacrylamide in sludge dewatering.Environmental Engineering,39(4),102–106.
