Polyelectrolyte for drinking water treatment
Water treatment plants clarify raw river, lake or reservoir water before filtration. A small dose of polymer after the coagulant builds bigger flocs, so clarifiers settle faster and filters run longer.
Sunfloc Anionic HQ for regular plant use, or Anionic MQ for smaller plants and trials. Confirm on your own sample with a free jar test.
Where the polymer goes
After the coagulant (alum or PAC), in the flocculation zone where mixing is gentle, before the clarifier or settling tank.
Which charge
Anionic polyacrylamide is the usual flocculant aid after a metal-salt coagulant. Start with Anionic HQ or Anionic MQ.
Dose
Clean, low-turbidity raw water needs very little polymer; monsoon turbidity needs more. The dosing guide lists typical starting ranges.
Tender documents
We provide the specification sheet and SDS for each grade for your approval file. Ask us for anything else your tender needs.
Related
Polyelectrolyte dosing guide
Starting doses, solution strength and how to work out kilograms per day.
Read →Where this work clusters
The safety limits that apply
Polymers used in drinking-water treatment are controlled for their residual acrylamide monomer. The US EPA treatment technique in 40 CFR 141.111 limits the monomer to 0.05% in the product when it is dosed at 1 mg/L, or an equivalent combination of lower monomer and higher dose.
The reason is the WHO guideline value for acrylamide in drinking water, 0.5 µg/L. WHO notes that at 1 mg/L dose and 0.05% monomer, the theoretical maximum is 0.5 µg/L, and that conventional treatment does not remove acrylamide, so the polymer is the point to control.
In practice, use a grade certified for potable use where your authority requires it, dose as low as the jar test allows, and keep the dose record. Confirm the requirement with your water authority, since the rules differ between countries and utilities.
Sources: US EPA, 40 CFR 141.111: treatment techniques for acrylamide; WHO, Guidelines for Drinking-water Quality, chapter 12: acrylamide; ASTM D2035-19, Coagulation-Flocculation Jar Test of Water.
Not sure which grade suits your water?
Send us a one-litre sample or describe your process. We test it in our lab free of charge and recommend a grade and starting dose, and quote within 1 business hour.