Settling Aids and Sludge Dewatering Aids

The need for settling aids and sludge dewatering aids

Settling aids are used to improve settling in the clarifier (mainly secondary) resulting in lower TSS and BOD for treated effluent prior to discharge.

Sludge dewatering aids are used to increase dryness content (closer to 40%) for ease of handling / transport and efficient burning (as a fuel) in the boiler.

The use of these aids provides the following benefits:

  • Improved final effluent quality.
  • Improved settling rates in sedimentation clarifiers.
  • Improved floatation rates in dissolved air floatation units.
  • Increased final sludge density, dryness of cake and lower filtrate solids.
  • Reduced dosage requirement.

Application areas

Dosage levels and application points depend on the nature of the substrate and operating conditions. Typical dosage ranges from 0.2 and 1.0 ppm for clarification. For sludge dewatering, dosage levels range from 1.5 to 3.0 Kg/ton of bone dry sludge.

We would recommend that diluted solutions be utilised within 24 hours for maximum effectiveness.


Amazon Papyrus has a range of settling and sludge dewatering aids for different raw material furnishes, market pulp producer or integrated pulp and paper operation etc. and to achieve specific purposes.

Our range includes high molecular weight, cationic charge density powder polymers. These are designed to be used as a highly effective flocculants in a variety of liquid – solid separations in clarifiers, thickeners and sludge dewatering equipment in waste water treatment plants.

Our team of professionals would work with you to select the most appropriate products to meet your specific needs.