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Polyacrylamide / the equivalent of anionic polyacrylamide ALCLAR HP-21 can be replaced
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Anionic polyacrylamide ALCLAR HP-21 is a high-molecular-weight flocculant specifically developed for efficient solid–liquid separation in a wide range of industrial and municipal processes. With its optimized anionic charge density and long polymer chain structure, anionic polyacrylamide ALCLAR HP-21 provides excellent particle-bridging capability, rapid floc formation, and reliable settling performance. It is widely used in water treatment, sludge thickening and dewatering, mining and mineral processing, alumina refining, and other clarification and thickening applications where high efficiency and stable operation are required.
One of the most important applications of anionic polyacrylamide ALCLAR HP-21 is in municipal and industrial wastewater treatment plants. In primary and secondary clarification processes, ALCLAR HP-21 is typically used as a flocculant following the addition of inorganic coagulants such as aluminum sulfate, ferric chloride, or polyaluminum chloride. After charge neutralization by the coagulant, anionic polyacrylamide ALCLAR HP-21 promotes the aggregation of destabilized particles through polymer bridging.
In municipal wastewater treatment, anionic polyacrylamide ALCLAR HP-21 improves suspended solids removal, reduces effluent turbidity, and increases clarifier throughput. In industrial wastewater systems—including chemical manufacturing, steel production, food processing, textile operations, and power plants—ALCLAR HP-21 effectively captures fine colloidal particles and inorganic solids that are difficult to settle by gravity alone. Its stable performance helps treatment facilities maintain consistent effluent quality under variable hydraulic and solids loading conditions.
Anionic polyacrylamide ALCLAR HP-21 is widely applied in sludge thickening processes to increase solids concentration prior to mechanical dewatering. In gravity thickeners and dissolved air flotation systems, ALCLAR HP-21 forms large, compact flocs that release free water efficiently, resulting in higher thickened sludge solids and reduced sludge volume.
In municipal treatment plants, anionic polyacrylamide ALCLAR HP-21 is suitable for primary sludge, waste activated sludge, and mixed sludge systems. In industrial applications, it performs well in thickening sludges containing inorganic particles, fibers, or mineral solids. Improved thickening efficiency achieved with ALCLAR HP-21 reduces the load on downstream dewatering equipment, lowers energy consumption, and improves overall plant efficiency.
A key application of anionic polyacrylamide ALCLAR HP-21 is in mechanical sludge dewatering processes such as belt filter presses, centrifuges, screw presses, and chamber filter presses. When properly prepared and dosed, ALCLAR HP-21 conditions sludge by forming strong, shear-resistant flocs that withstand mechanical stress during dewatering.
The use of anionic polyacrylamide ALCLAR HP-21 increases cake solids content, reduces filtrate turbidity, and improves dewatering throughput. In high-shear centrifuge applications, ALCLAR HP-21 maintains floc integrity, resulting in stable operation and reduced polymer consumption. Improved dewatering performance leads to lower sludge transportation and disposal costs and easier handling of dewatered sludge.
In mining and mineral processing industries, anionic polyacrylamide ALCLAR HP-21 plays a critical role in tailings thickening, slurry clarification, and process water recovery. Fine mineral particles such as silica, clay, and metal oxides often remain suspended for extended periods due to their small particle size and surface charge characteristics. ALCLAR HP-21 effectively aggregates these particles into large flocs, accelerating settling and improving compaction.
In tailings thickeners, anionic polyacrylamide ALCLAR HP-21 increases underflow solids concentration and produces clear overflow water suitable for recycling back into the process circuit. This reduces freshwater consumption and supports sustainable mining operations. ALCLAR HP-21 is also used in high-density and paste thickening systems, where strong floc structure is essential for stable underflow discharge and safe tailings management.
A major industrial application of anionic polyacrylamide ALCLAR HP-21 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 to maximize alumina recovery.
Anionic polyacrylamide ALCLAR HP-21 enhances red mud flocculation, resulting in faster settling rates, improved underflow density, and clearer overflow liquor. This improves washing efficiency, reduces caustic soda losses, and stabilizes thickener operation. In high-solids red mud disposal systems, ALCLAR HP-21 contributes to improved rheology and more efficient pumping, stacking, or dry disposal of residue.
Anionic polyacrylamide ALCLAR HP-21 is also widely used in sand washing and aggregate processing plants. During washing and classification, fine silt and clay particles become suspended in process water. ALCLAR HP-21 promotes rapid flocculation of these fines, allowing efficient settling in clarifiers and settling tanks.
This application reduces the need for large settling ponds, improves water recycling efficiency, and minimizes environmental discharge. At the same time, the use of anionic polyacrylamide ALCLAR HP-21 enhances the quality of washed sand and aggregates by reducing residual fines content and improving product consistency.
The key advantages of anionic polyacrylamide ALCLAR HP-21 include high flocculation efficiency, low dosage requirement, and adaptability to a wide range of water chemistries. ALCLAR HP-21 performs effectively over a broad pH range and in both low- and high-solids systems. Proper polymer preparation, including controlled dissolution, sufficient aging time, and correct dosing, is essential to achieve maximum chain extension and optimal flocculation performance.
In summary, anionic polyacrylamide ALCLAR HP-21 is a versatile and high-performance flocculant used in municipal and industrial water treatment, sludge thickening and dewatering, mining and mineral processing, alumina refining, and aggregate processing. Its strong particle-bridging capability, reliable performance, and cost efficiency make anionic polyacrylamide ALCLAR HP-21 a preferred solution for challenging solid–liquid separation applications across multiple industries.
