How Sedimentation Water Treatment Works

Sedimentation separates suspended solids from water by gravity. Polyacrylamide improves the process by turning fine, slow-settling particles into larger floc that moves quickly into the sludge zone.

1. Destabilize fine particles

Many wastewater and process water streams contain colloids that do not settle efficiently. Coagulants and pH control can reduce particle stability before polymer is added.

2. Build dense floc with PAM

Polyacrylamide adsorbs onto particle surfaces and bridges them together. The correct grade depends on charge, molecular weight, solids type, salinity, and mixing conditions.

3. Control settling and sludge withdrawal

Good floc should settle quickly without creating a fragile sludge blanket. Operators monitor overflow clarity, blanket height, sludge density, and chemical consumption.

4. Confirm by jar testing

Jar testing remains the practical first step. The trial should use real site water, realistic mixing energy, and enough settling time to compare supernatant clarity and sludge volume.