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Created on 04.13
Why PAM Isn't Settling: 10 Troubleshooting Checkpoints (part 4)
Checkpoint 9: Solution age and temperature can quietly reduce performance
Even when perfectly prepared, polymer solutions can lose effectiveness over time due to biological growth, hydrolysis changes, or gradual chain scission—especially when warm and recirculated.
Practical controls
· Make smaller batches and compare “fresh” vs “aged” solution side-by-side in a jar test;
· Keep tanks shaded and as cool as feasible; high temperature accelerates degradation mechanisms;
· Avoid unnecessary circulation once fully hydrated.
Checkpoint 10: Product handling issues—expired stock, contamination, or wrong dilution water
PAM is sensitive to storage and handling. Emulsions can separate; dry polymers can cake and absorb moisture; contamination with oil, surfactants, or incompatible coagulants can reduce performance.
Quick check list
· Verify lot number and shelf-life; compare a new container against current stock;
· Check for freezing/overheating history; both can damage emulsions and solutions;
· Inspect day tank and lines for oil/grease contamination (common after maintenance);
· Confirm dilution water source hasn’t changed (switching to chlorinated or high-salinity water is a frequent culprit).
A fast, repeatable troubleshooting workflow (so you don’t chase ghosts)
To resolve PAM performance issues efficiently, isolate variables in this order—each step removes a common failure mode before you change chemistry.
00001. Prepare a fresh small batch with correct wetting order and adequate hydration time.
00002. Run a mini dose ladder (e.g., low/medium/high) in jar tests to bracket the optimum and spot overdosing.
00003. Compare site water vs low-oxidant/low-salinity water for make-down if available.
00004. Bypass or reduce shear (gravity feed or low-shear pump) and compare results.
00005. Adjust injection point to improve dispersion but protect forming floc.
00006. If still poor, try a different charge density or molecular weight with the same workflow.
Most fixes become obvious by step 3. If they don’t, you likely have a grade mismatch or an upstream change in solids/coagulant chemistry that requires re-optimization.
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