Low Dose PolyDADMAC Cationic Polyelectrolyte for Surface Water Coagulation

Product Overview

PolyDADMAC, also known as PDADMAC or Poly(dimethyldiallylammonium chloride), is a liquid cationic polyelectrolyte with strong charge neutralization ability. It is widely used in drinking water treatment, wastewater treatment, sludge dewatering, industrial clarification, mining, paper-making, textile, and oil industry applications.

In surface water treatment, raw water from rivers, lakes, reservoirs, and canals often contains clay, silt, algae, natural organic matter, colloids, and fine suspended particles. These impurities are usually negatively charged and remain stable in water, making them difficult to remove by natural settling or filtration alone.

Bluwat Low Dose PolyDADMAC provides high cationic charge density to neutralize these particles rapidly. Once destabilized, the fine particles can aggregate into larger flocs, making them easier to remove by sedimentation, clarification, flotation, or filtration.

Because of its strong charge neutralization performance, PolyDADMAC can be effective at relatively low dosage levels after proper jar testing and plant optimization.

Application in Surface Water Coagulation

Surface water quality can change due to rainfall, seasonal runoff, algae growth, flooding, and organic matter variation. A stable coagulant system is important for water treatment plants that need reliable clarification performance under changing raw water conditions.

Bluwat PolyDADMAC Cationic Polyelectrolyte can be used in:

Key Benefits

Working Principle

PolyDADMAC improves surface water coagulation mainly through charge neutralization and floc formation.

Treatment mechanism:

1. Surface water contains negatively charged clay, silt, algae, organic matter, and colloidal particles.
2. PolyDADMAC provides strong cationic charge to neutralize particle surfaces.
3. Destabilized particles begin to collide and aggregate.
4. Larger flocs form during slow mixing.
5. Flocs settle in clarifiers or are removed by filtration.
6. Clarified water has lower turbidity and reduced suspended solids.

Recommended Treatment Process

Product Specifications

Available PolyDADMAC Liquid Grades

DA 20% Series

DA 40% Series

DA 45% Series

DA 50% Series

Application Method

For surface water coagulation, PolyDADMAC should be selected according to raw water turbidity, suspended solids concentration, organic matter, algae content, water temperature, pH value, treatment process, and required clarified water quality.

When used alone, PolyDADMAC is normally diluted to 0.5–5% concentration based on solid content before dosing.

The optimum low dosage should be confirmed by jar testing and plant trials. The dosing point and mixing speed should be carefully controlled to ensure uniform dispersion and proper floc formation. Excessive shear should be avoided after flocs are formed.

Product Selection Guidance

For low to medium turbidity surface water, DA 201 to DA 203 or DA 401 to DA 403 can be tested first because they offer easier dispersion and fast charge neutralization.

For high turbidity water, rainfall runoff, algae-containing water, or difficult colloidal particles, DA 204, DA 205, DA 404, or DA 405 may help improve floc size and settling performance.

For treatment systems requiring higher active content and lower logistics volume, 40%, 45%, or 50% liquid grades can be considered after confirming dosing system compatibility.

Final product selection should be based on turbidity removal, floc size, settling speed, clarified water quality, filter performance, dosage, and total treatment cost.

Use with PAC or Other Coagulants

PolyDADMAC can be used alone or together with inorganic coagulants such as PAC, alum, ACH, ferric chloride, or ferric sulfate.

PolyDADMAC mainly provides strong charge neutralization.

PAC, alum, ACH, and ferric salts mainly provide inorganic coagulation and hydroxide floc formation.

Combined use may improve floc quality, reduce residual turbidity, enhance sedimentation, and optimize total chemical consumption. The best dosing sequence and dosage should be confirmed through jar testing using actual surface water samples.

Packaging and Storage

Bluwat PolyDADMAC Liquid is available in:

Store the product in original containers in a cool and dry place. Keep away from heat, flame, and direct sunlight. Refer to the TDS, MSDS, product label, and applicable regulatory documents for detailed storage and handling information.

Why Choose Bluwat Low Dose PolyDADMAC?

Bluwat Chemicals is a professional manufacturer and exporter of water treatment chemicals, supplying PolyDADMAC, PAC, PAM, ACH, Polyamine, and other coagulants and flocculants for municipal and industrial water treatment.

Advantages:

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