Application of Cationic Polyacrylamide PRAESTOL LT27 DK

PRAESTOL LT27 DK is a high-performance cationic polyacrylamide (CPAM) flocculant produced for advanced solid–liquid separation, sludge dewatering, and wastewater clarification. It is typically supplied in dry granular or powder form and is known for its medium to high cationic charge density combined with high molecular weight. These properties allow PRAESTOL LT27 DK to deliver strong charge neutralization, rapid floc formation, and excellent water release characteristics under a wide range of operating conditions. Due to its reliable performance and broad adaptability, PRAESTOL LT27 DK is widely used in municipal wastewater treatment plants, industrial effluent treatment systems, papermaking, food processing, mining, and oilfield applications.

1. Municipal Wastewater Treatment Application

One of the most important application fields of PRAESTOL LT27 DK is municipal sewage and sludge treatment. Domestic wastewater contains large amounts of negatively charged organic matter, bacteria, fine suspended solids, and colloidal particles that cannot settle efficiently by gravity alone. PRAESTOL LT27 DK neutralizes the surface charges of these particles and forms large, dense flocs through polymer bridging, significantly improving sedimentation efficiency.

In primary and secondary clarification, PRAESTOL LT27 DK helps reduce turbidity, total suspended solids (TSS), and organic carryover into downstream biological processes. Its application stabilizes clarifier operation, improves effluent quality, and ensures compliance with increasingly strict environmental discharge standards.

In sludge treatment systems, PRAESTOL LT27 DK is widely used as a sludge conditioning agent before belt filter presses, centrifuges, screw presses, and plate-and-frame filter presses. By breaking the hydration layer around sludge particles and forming strong, shear-resistant flocs, it enables rapid water release and significantly improves sludge cake dryness. This results in lower sludge volume, reduced transportation and disposal costs, and improved overall plant operating efficiency.

2. Industrial Wastewater Treatment

PRAESTOL LT27 DK plays a vital role in treating wastewater from a wide range of industries, including textile and dyeing, chemical manufacturing, pharmaceutical production, electroplating, leather processing, metallurgy, and food processing.

Textile and Dyeing Industry

Textile effluents are characterized by high color, high COD, and large quantities of anionic dyes, surfactants, and fine fibers. PRAESTOL LT27 DK effectively captures these pollutants through strong electrostatic attraction and polymer bridging, resulting in excellent color removal and turbidity reduction. This improves the performance of subsequent biological treatment and enables partial water reuse in some operations.

Electroplating and Metal Processing

Electroplating wastewater contains dissolved heavy metals such as copper, zinc, nickel, and chromium. After chemical precipitation, PRAESTOL LT27 DK improves the aggregation and settling of fine metal hydroxide particles. This ensures low residual metal content in treated water, protects downstream equipment, and helps enterprises meet strict environmental discharge regulations.

Chemical and Pharmaceutical Industry

Chemical and pharmaceutical wastewater often contains fine organic particles, emulsified materials, and colloidal impurities. PRAESTOL LT27 DK improves solid–liquid separation efficiency, stabilizes treatment performance, and reduces the toxic load entering biological treatment systems.

3. Sludge Dewatering and Conditioning

Sludge dewatering is one of the core application advantages of PRAESTOL LT27 DK. Activated sludge and industrial mixed sludge contain large quantities of bound water held by negatively charged organic compounds. Without proper conditioning, mechanical dewatering efficiency remains low.

PRAESTOL LT27 DK works by:

• Neutralizing the surface charges of sludge particles

• Destroying the hydration layer around solids

• Forming dense, compact, and shear-stable flocs

As a result, users benefit from:

• Faster filtration and centrifugation rates

• Higher dry solids content in sludge cake

• Reduced polymer consumption per ton of dry sludge

• Increased dewatering equipment capacity

It is suitable for a wide range of sludge types, including activated sludge, biological sludge, oily sludge, and mixed industrial sludge.

4. Papermaking and Pulp Industry

The papermaking industry is one of the largest users of cationic polyacrylamide products. PRAESTOL LT27 DK is widely used as:

• A retention aid

• A drainage aid

• A papermaking sludge dewatering agent

During paper sheet formation, large quantities of fine fibers, fillers such as calcium carbonate and kaolin clay, and sizing agents tend to escape with white water. PRAESTOL LT27 DK enhances first-pass retention, improves drainage speed on the wire section, and contributes to better paper formation and strength properties. Reduced fiber loss leads to improved raw material utilization and lower pollution load in papermaking wastewater.

In paper mill sludge treatment, PRAESTOL LT27 DK significantly improves dewatering efficiency, reduces energy consumption during thermal drying, and lowers sludge disposal costs.

5. Food and Beverage Industry

Wastewater from the brewery, dairy, sugar, beverage, starch, and meat processing industries contains high levels of suspended solids, fats, oils, proteins, and carbohydrates. PRAESTOL LT27 DK efficiently removes these pollutants by rapid flocculation and separation.

In dissolved air flotation (DAF) and sedimentation systems, PRAESTOL LT27 DK is often used in combination with inorganic coagulants such as PAC or aluminum sulfate to enhance flotation efficiency, improve scum formation, and achieve clear effluent suitable for biological treatment or discharge.

6. Mining and Mineral Processing

In mining operations, PRAESTOL LT27 DK is applied in:

• Tailings thickening

• Mineral slurry clarification

• Process water recycling

Fine mineral particles carry strong negative charges and remain suspended for long periods without chemical treatment. PRAESTOL LT27 DK promotes rapid particle aggregation and sedimentation, producing high-density underflow and clear overflow water for reuse. This helps reduce freshwater consumption, stabilize tailings ponds, and improve environmental protection at mining sites.

7. Oilfield and Drilling Wastewater

In oil and gas production, PRAESTOL LT27 DK is used to treat:

• Produced water

• Drilling fluid wastewater

• Refinery oily wastewater

It effectively removes fine suspended solids, clay particles, polymer residues, and emulsified oil droplets. This improves oil–water separation efficiency and ensures treated water meets reuse or discharge standards.

8. Key Advantages of PRAESTOL LT27 DK

PRAESTOL LT27 DK offers several technical and economic advantages, including:

• High flocculation efficiency at low dosage

• Strong and fast floc formation

• Excellent sludge dewatering performance

• Wide adaptability to different wastewater types and pH ranges

• Good compatibility with inorganic coagulants and flotation systems

• Reduced operating and sludge disposal costs

Conclusion

PRAESTOL LT27 DK is a versatile and highly efficient cationic polyacrylamide flocculant with outstanding performance in municipal wastewater treatment, industrial effluent clarification, sludge dewatering, papermaking, food processing, mining, and oilfield water treatment. Its strong charge neutralization capability, high molecular weight polymer structure, and excellent water-release characteristics enable it to significantly improve treatment efficiency while reducing chemical consumption and operating costs. With the tightening of global environmental regulations and the increasing demand for sustainable water management, PRAESTOL LT27 DK remains a reliable and cost-effective solution for modern wastewater and sludge treatment systems.