Anionic polyacrylamide PRAESTOL 2640 DK is a high–molecular-weight, water-soluble polymer specifically designed for efficient flocculation, solid–liquid separation, sedimentation acceleration, and sludge dewatering. With its optimized anionic charge density and long molecular chain structure, PRAESTOL 2640 DK provides excellent bridging between fine suspended particles, making it particularly effective for inorganic solids, mineral suspensions, and high-turbidity wastewater systems. It is widely applied in municipal and industrial wastewater treatment, mining and mineral processing, sand washing, sludge dewatering, papermaking, and various industrial effluent treatment operations.

1. Municipal and Industrial Wastewater Treatment

One of the primary applications of PRAESTOL 2640 DK is in municipal and industrial wastewater treatment plants. Wastewater typically contains suspended solids such as clay, silt, metal hydroxides, fiber fines, and fine organic matter that are difficult to settle naturally. PRAESTOL 2640 DK rapidly destabilizes these fine particles and aggregates them into large, compact flocs, which significantly improves sedimentation speed and clarification efficiency.

In primary clarification, it reduces turbidity and total suspended solids (TSS). In secondary biological treatment, it improves sludge settleability in activated sludge systems, reducing the risk of sludge bulking. In tertiary treatment, PRAESTOL 2640 DK is used as a polishing flocculant to further enhance effluent clarity before discharge or reuse. It is widely applied to wastewater from chemical plants, electroplating factories, textile mills, dyeing units, food processing plants, steel mills, and pharmaceutical facilities, helping industries meet strict environmental discharge standards.

2. Sludge Dewatering and Conditioning

PRAESTOL 2640 DK is extensively used as a sludge conditioning and dewatering aid in mechanical dewatering equipment such as belt filter presses, centrifuges, screw presses, and plate-and-frame filter presses. When added before dewatering, it binds fine sludge particles into strong, fast-draining flocs.

Key performance benefits include:

• Increased sludge cake dry solids content

• Faster filtration and dewatering speed

• Reduced sludge volume

• Lower energy consumption

• Significant savings in sludge transport and disposal costs

It performs particularly well in the dewatering of inorganic sludges, such as those generated from mineral processing, sand washing plants, coal preparation plants, and metallurgical wastewater systems. It is also highly effective for municipal sewage sludge, where moisture reduction is critical for landfill disposal, incineration, or composting.

3. Mining and Mineral Processing Industry

In the mining and mineral processing sector, PRAESTOL 2640 DK is widely used as a thickening and tailings treatment flocculant. During ore beneficiation, grinding and flotation processes generate large quantities of ultrafine mineral particles that remain suspended in process water. PRAESTOL 2640 DK rapidly aggregates these fines, allowing fast sedimentation in thickeners, clarifiers, and tailings ponds.

It is commonly applied in the processing of:

• Iron ore

• Copper ore

• Gold ore

• Coal

• Phosphate

• Bauxite

Its use significantly improves overflow water clarity, enabling efficient water recycling and reducing freshwater consumption. In tailings treatment, PRAESTOL 2640 DK promotes faster solids consolidation, improved dam stability, and enhanced water recovery, which are essential for safe and environmentally responsible mining operations.

4. Sand Washing and Aggregate Processing

PRAESTOL 2640 DK is widely used in sand washing plants, quarry operations, and construction aggregate processing facilities. Wash water generated during sand and gravel processing contains high levels of fine clay, silt, and suspended solids that settle very slowly under natural conditions.

By applying PRAESTOL 2640 DK, these fine particles rapidly flocculate and settle in thickeners or clarifiers, enabling:

• Efficient recycling of process water

• Reduced size and maintenance of settling ponds

• Cleaner and higher-quality sand production

• Lower environmental discharge load

This application is especially important in areas with limited water resources and strict environmental regulations.

5. Papermaking and Pulp Processing

In the pulp and paper industry, PRAESTOL 2640 DK is used as a retention aid, drainage aid, and white-water clarification agent. It improves the retention of:

• Cellulose fibers

• Mineral fillers such as calcium carbonate and kaolin

• Fine paper additives

As a result, it enhances paper sheet formation, product strength, production efficiency, and raw-material utilization. In white-water recovery systems, PRAESTOL 2640 DK helps separate fibers and fines from water, allowing clean water reuse and reducing wastewater discharge volume.

6. Textile and Dyeing Wastewater Treatment

Textile and dyeing wastewater contains high color, surfactants, starch, suspended fibers, and complex organic compounds. PRAESTOL 2640 DK is used after coagulation to flocculate these contaminants and promote rapid sedimentation. This leads to:

• Improved color removal

• Reduced turbidity and suspended solids

• Lower COD and BOD load on biological treatment systems

• More stable operation of downstream treatment units

Its use allows textile factories to achieve regulatory compliance while controlling chemical consumption and operating costs.

7. Food and Beverage Industry Wastewater

In the food and beverage industry, wastewater typically contains proteins, fats, sugars, starches, and fine organic solids. PRAESTOL 2640 DK efficiently flocculates these pollutants and improves clarification and flotation performance. It is widely applied in:

• Dairy processing plants

• Breweries and beverage factories

• Meat and poultry processing facilities

• Sugar, starch, and food ingredient manufacturing

Its application reduces treatment system loading and improves sludge dewatering efficiency.

8. Key Performance Advantages

PRAESTOL 2640 DK offers several important technical and economic advantages:

• High molecular weight for strong floc formation

• Excellent performance with inorganic and mineral suspensions

• Low dosage requirement and high cost efficiency

• Rapid dissolution and easy handling

• Wide operating pH range

• Good environmental compatibility