Application Range

Cationic polyacrylamide can fully meet the requirements of wastewater treatment and sludge dewatering. It exhibits excellent performance in clarification, purification, sedimentation promotion, filtration enhancement, and thickening.

It is widely used for the treatment of wastewater with high organic colloid content in industries such as textile dyeing, papermaking, food processing, construction, metallurgy, mineral processing, coal washing, oilfield operations, aquatic product processing, and fermentation.

It is especially suitable for sludge dewatering of municipal wastewater, municipal sludge, papermaking sludge, and various industrial sludges.

Product Properties

Appearance: White powder or granular form

Solid Content: ≥ 90%

Molecular Weight: 8–12 million

Water Insolubles: ≤ 0.5%

Residual Monomer: ≤ 0.05%

Cationic Degree: 10–90%

Dissolution Time: ≤ 60 minutes

Features and Performance

1.Excellent water solubility; completely soluble even in cold water.

2.Only a small dosage of cationic polyacrylamide is required to achieve strong flocculation effects.

Typical dosage ranges from 0.01 to 10 ppm (0.01–10 g/m³).

3.When used in combination with inorganic flocculants such as polymeric ferric sulfate, polyaluminum chloride, or iron salts, enhanced treatment performance can be achieved.

Product Description

Cationic polyacrylamide is a linear high-molecular-weight polymer containing a large number of positively charged functional groups along its molecular chain.

It is synthesized through copolymerization of acrylamide monomers with cationic monomers (such as dimethyldiallylammonium chloride). The molecular weight generally ranges from 5 million to 12 million.

After dissolution in water, it forms long-chain molecules with strong positive charges, making it a key material in applications such as water treatment, papermaking, and oil recovery.

According to the cationic degree (typically 5%–60%), it can be classified into low, medium, and high cationic types.

Preparation Method

1.Prepare an aqueous solution with a concentration of 0.2% (based on solid content). Neutral water without salts is recommended.

2.During dissolution, slowly and evenly add the product into stirred water. Moderate heating (below 60°C) can accelerate dissolution.Typical stirring time is about 40 minutes.

3.Preparation should be carried out in enamel-lined, galvanized, aluminum, or plastic containers.

Iron containers must not be used for preparation or storage.

4.During dissolution, avoid lump formation by adding the product slowly under continuous stirring and heating if necessary.

Excessive mechanical shear should be avoided. The recommended stirring speed is 60–200 rpm.

Over-shearing may cause polymer degradation and reduce performance.

Usage Instructions

1.Concentration Control

The recommended solution concentration is generally 0.1%–0.3%.

Excessively high concentrations may cause material waste and poor dosing uniformity, while overly low concentrations may reduce treatment efficiency.

2.Sludge Property Matching

Select an appropriate cationic degree based on sludge source, characteristics, and composition.

Cationic polyacrylamide is mainly used for organic sludge dewatering. For sludge with strong acidity or alkalinity, suitable product types should be selected according to pH value.

3.Floc Size Control

Adjust molecular weight to achieve optimal floc size, ensuring effective dewatering without forming overly compact flocs that may reduce cake dryness.

4.Flocculant Selection

Prior to full-scale application, laboratory jar tests are recommended to determine the optimal CPAM grade and dosage, ensuring best flocculation performance and reduced operating costs.

5.Combination with Other Chemicals

When used together with coagulants such as polyaluminum chloride (PAC), the chemicals should be dissolved and added separately.

Follow the specified addition sequence and strictly control dosage ratios and dosing speed.

Precautions

1.Importance of Proper Selection

Different manufacturers and grades of cationic polyacrylamide vary significantly in molecular weight, cationic degree, and molecular structure.

No single product is universally suitable for all water qualities or process conditions.

Laboratory and pilot-scale tests are strongly recommended prior to application.

2.Dissolution and Preparation

CPAM is supplied as a white powder or granular solid and must be fully dissolved in water before use, typically at 0.1%–0.5% concentration.

Clean water should be used; high salinity or highly contaminated water should be avoided.

The product should be added slowly and evenly to prevent agglomeration.

3.Dosing Point and Dosage Control

Proper dosing point selection is critical.

For sludge dewatering, CPAM solution is usually added before the dewatering equipment to allow sufficient flocculation time while avoiding excessive shear that could break flocs.

Overdosing may lead to charge reversal and reduced flocculation efficiency.

4.After adding the flocculant solution to a suspension, prolonged intense agitation should be avoided, as it may destroy formed flocs.

5.CPAM solutions should be prepared fresh and used promptly.

Prolonged storage may result in gradual performance loss depending on water quality.

Packaging and Storage

Cationic polyacrylamide should be stored in a dry, clean, and well-ventilated area.

Avoid moisture, package damage, and contact with strong acids, strong alkalis, or high-salinity substances to prevent product degradation.

What advantages does CPAM offer in sludge dewatering?

A:
CPAM provides strong flocculation ability, fast settling speed, and improved sludge cake dryness.
With a low dosage requirement, it helps reduce chemical consumption and overall operating costs.