Choosing APAM, CPAM, or NPAM for flocculation
The first selection question is usually ion type. The answer depends on solids chemistry, treatment stage, pH, salinity, and whether the goal is clarification or sludge dewatering.
| Type | Typical fit | Where to test first |
|---|---|---|
| Anionic PAM (APAM) | Inorganic suspended solids, mining water, produced water clarification, high-TDS streams. | Clarifiers, thickeners, tailings water, reuse polishing. |
| Cationic PAM (CPAM) | Organic-rich sludge, biological solids, low-to-neutral pH wastewater, sludge conditioning. | Centrifuges, belt presses, filter presses, municipal sludge. |
| Nonionic PAM (NPAM) | Broad pH conditions or cases where charge interaction must be gentle. | Acidic water, mixed industrial streams, special clarification trials. |
Selection variables
- Molecular weight: affects polymer chain length, bridging, floc size, and shear sensitivity.
- Charge density: controls interaction strength with particles and dissolved ions.
- Dissolution time: under-hydrated polymer causes inconsistent field results.
- Make-down concentration: impacts mixing, activation, and dose accuracy.
After narrowing the polymer family, review supplier data and request samples. Xinqi Polymer provides product references for anionic polyacrylamide and cationic polyacrylamide, which can be compared against jar test results.
Next step: match the polymer family to specific water treatment applications, then validate with jar testing.