Polyacrylamide flocculants and a cationic PolyDADMAC coagulant for clarification and sludge dewatering in municipal and industrial water treatment.
Flocculants are water-soluble polymers that bind small, destabilized particles into larger flocs that settle or filter out of water. In water treatment they follow coagulation: a coagulant first neutralizes the surface charge that keeps fine solids suspended, then a high-molecular-weight flocculant such as polyacrylamide bridges those particles into a floc the clarifier or dewatering press can remove. The two steps are distinct, and most clarification or sludge programs use both.
Polyacrylamide (PAM) is the workhorse flocculant, supplied as dry crystal or as an emulsion in anionic, cationic, and nonionic charges. Charge selection is the decision that matters: cationic PAM dewaters organic biosolids and sludge, while anionic PAM settles mineral and inorganic solids. The wrong charge gives little bridging and a wasted dose, so run a jar test before you specify. Dry product costs less per active pound; emulsion makes down faster at a higher unit price.
PolyDADMAC is a low-molecular-weight cationic polymer that works as an organic coagulant rather than a bridging flocculant. It neutralizes charge, often replacing or supplementing an inorganic coagulant such as alum, and is dosed ahead of or alongside a PAM flocculant. For potable-water contact, specify a grade certified to NSF/ANSI 60 and confirm residual-monomer limits, because residual acrylamide governs where polyacrylamide can be used.
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