Application of Anionic Polyacrylamide PRAESTOL 25100

Anionic polyacrylamide PRAESTOL 25100 is a high-molecular-weight flocculant developed for efficient solid–liquid separation in a wide range of industrial and municipal processes. With its strong anionic charge and long polymer chains, anionic polyacrylamide PRAESTOL 25100 is especially effective in aggregating fine, negatively charged particles through polymer bridging. It is widely used in wastewater treatment, sludge dewatering, mining and mineral processing, alumina refining, and other clarification and thickening applications where high settling efficiency and clear overflow are required.

Municipal and Industrial Wastewater Treatment

One of the primary applications of anionic polyacrylamide PRAESTOL 25100 is in municipal and industrial wastewater treatment plants. In primary and secondary clarification systems, PRAESTOL 25100 is typically dosed after inorganic coagulants such as aluminum sulfate, ferric chloride, or polyaluminum chloride. After charge neutralization by the coagulant, anionic polyacrylamide PRAESTOL 25100 acts as a flocculant, forming large and dense flocs via polymer bridging.

In municipal wastewater treatment, anionic polyacrylamide PRAESTOL 25100 improves suspended solids removal, reduces turbidity, and enhances clarifier capacity. In industrial wastewater treatment—such as wastewater from chemical plants, steel mills, refineries, food processing facilities, and power plants—PRAESTOL 25100 effectively captures fine colloids, inorganic solids, and organic matter that are difficult to settle by gravity alone. Its stable performance helps treatment plants maintain consistent effluent quality under fluctuating flow and loading conditions.

Sludge Thickening and Mechanical Dewatering

Anionic polyacrylamide PRAESTOL 25100 is extensively used in sludge thickening and mechanical dewatering processes. It is suitable for gravity thickeners, belt filter presses, centrifuges, screw presses, and chamber filter presses. When added to sludge, PRAESTOL 25100 conditions the solids by forming strong, shear-resistant flocs that release water efficiently during mechanical separation.

In activated sludge, primary sludge, and mixed sludge systems, anionic polyacrylamide PRAESTOL 25100 increases cake solids content while reducing filtrate turbidity. This results in lower sludge volume, reduced transportation and disposal costs, and improved overall plant efficiency. Due to its high molecular weight, PRAESTOL 25100 produces robust flocs that remain stable under high shear conditions, ensuring reliable dewatering performance.

Mining and Mineral Processing

In mining and mineral processing operations, anionic polyacrylamide PRAESTOL 25100 plays a critical role in tailings thickening, slurry clarification, and process water recovery. Fine mineral particles such as silica, clay, and metal oxides often carry negative surface charges and remain suspended for long periods. PRAESTOL 25100 effectively aggregates these particles, accelerating settling and improving underflow compaction.

In tailings thickeners, anionic polyacrylamide PRAESTOL 25100 increases underflow solids concentration and produces clear overflow water suitable for reuse in the process circuit. This reduces freshwater consumption and supports sustainable mining practices. PRAESTOL 25100 is also used in high-density and paste thickening applications, where stable floc formation is essential for consistent underflow discharge and safe tailings disposal.

Alumina Refining and Red Mud Treatment

A key industrial application of anionic polyacrylamide PRAESTOL 25100 is in alumina refining, particularly in red mud settling and washing circuits of the Bayer process. During bauxite digestion, fine red mud particles must be efficiently separated from sodium aluminate liquor. PRAESTOL 25100 enhances red mud flocculation, resulting in faster settling rates and improved mud compaction.

The use of anionic polyacrylamide PRAESTOL 25100 leads to clearer overflow liquor, improved washing efficiency, and reduced caustic soda losses. In high-solids red mud thickeners, PRAESTOL 25100 improves underflow rheology, supporting stable pumping, stacking, or dry disposal of residue and improving overall plant productivity.

Sand Washing and Aggregate Processing

Anionic polyacrylamide PRAESTOL 25100 is also widely applied in sand washing plants and aggregate processing facilities. During washing and classification, fine silt and clay particles are suspended in process water. PRAESTOL 25100 promotes rapid flocculation of these fines, allowing efficient settling in clarifiers and settling tanks.

This application improves water recycling efficiency, reduces the need for large settling ponds, and minimizes environmental discharge. At the same time, the use of anionic polyacrylamide PRAESTOL 25100 enhances the quality of washed sand and aggregates by reducing residual fines content.

Operational Advantages

The main advantages of anionic polyacrylamide PRAESTOL 25100 include high flocculation efficiency, low dosage requirement, and adaptability to a wide range of water chemistries. It performs well over a broad pH range and is effective in both low- and high-solids systems. Proper polymer dissolution and aging are essential to achieve optimal performance and maximize floc strength.

Conclusion

In conclusion, anionic polyacrylamide PRAESTOL 25100 is a versatile and high-performance flocculant used in wastewater treatment, sludge dewatering, mining, alumina refining, and aggregate processing. Its strong particle-bridging capability, reliable performance, and cost efficiency make anionic polyacrylamide PRAESTOL 25100 a preferred solution for demanding industrial solid–liquid separation applications.