PolyDADMAC Cationic Flocculant Polymer for DAF and Coagulation Process

PolyDADMAC Cationic Flocculant Polymer for DAF and Coagulation Process

BLUWAT PolyDADMAC is a high charge density cationic flocculant polymer used in DAF and coagulation processes for wastewater treatment, effluent clarification, turbidity reduction, suspended solids removal and sludge dewatering.

In many industrial and municipal wastewater treatment systems, fine particles, colloids, oils, organic impurities and color-causing substances are difficult to separate directly. These contaminants often carry negative charges and remain stable in water.

PolyDADMAC provides strong cationic charge neutralization. After dosing, it destabilizes negatively charged particles and helps them gather into larger flocs. These flocs can then be removed more efficiently by dissolved air flotation, sedimentation, filtration or sludge dewatering equipment.

BLUWAT BLU DA Series Liquid PolyDADMAC is available in 20% to 50% solid content grades with different viscosity and molecular weight options. It is easy to dilute, pump and dose, making it suitable for continuous wastewater treatment operation.

Product Overview

PolyDADMAC, also known as PDADMAC or Poly Dimethyl Diallyl Ammonium Chloride, is a water-soluble cationic polymer widely used as a coagulant and flocculation aid.

For DAF systems, PolyDADMAC helps condition wastewater before air flotation. It improves particle destabilization, floc formation and flotation efficiency. For coagulation processes, it can be used alone or together with inorganic coagulants such as Polyaluminium Chloride to improve treatment performance.

It is suitable for textile wastewater, paper mill wastewater, chemical wastewater, food processing wastewater, oily wastewater, municipal wastewater, mining wastewater and sludge conditioning.

Key Benefits

Technical Information

Application in DAF Process

DAF, or dissolved air flotation, is widely used for wastewater treatment where suspended solids, oil, grease, fibers or light flocs need to be separated from water.

Before DAF, the wastewater usually needs chemical conditioning. PolyDADMAC helps improve this conditioning stage by neutralizing charges and helping small particles form flocs.

In DAF systems, PolyDADMAC can help with:

• Suspended solids removal
• Oil and grease separation support
• Turbidity reduction
• Floc formation before flotation
• Improved bubble-floc attachment
• Clearer floated water
• Better sludge scum formation

It is commonly used in textile wastewater, paper mill wastewater, food processing wastewater, oily wastewater, chemical wastewater and municipal wastewater pretreatment.

Application in Coagulation Process

In coagulation treatment, the main goal is to destabilize suspended solids and colloids so they can gather into larger particles.

PolyDADMAC works as a cationic polymer coagulant. It provides strong positive charges to neutralize negatively charged impurities in wastewater.

It can be applied in:

• Rapid mixing tanks
• Coagulation tanks
• DAF pretreatment systems
• Sedimentation systems
• Industrial wastewater pretreatment
• Municipal wastewater clarification
• Sludge conditioning systems

For many wastewater types, PolyDADMAC can improve treatment stability when influent quality changes.

Recommended Treatment Sequence

For many DAF and coagulation systems, the process can be adjusted as follows:

1. Step 1: Test wastewater pH, turbidity, suspended solids, color and oil content
2. Step 2: Adjust pH if required by jar test
3. Step 3: Add PAC if inorganic coagulation is needed
4. Step 4: Add PolyDADMAC for charge neutralization and floc conditioning
5. Step 5: Add PAM if larger flocs are required
6. Step 6: Send conditioned wastewater to DAF, sedimentation or filtration
7. Step 7: Check final effluent clarity, sludge condition and chemical cost
8. Step 8: Optimize dosage according to actual site performance

For some wastewater, PolyDADMAC may be dosed before PAC. For other wastewater, PAC may be dosed first. The best dosing order should be confirmed by jar test.

Typical Applications

How PolyDADMAC Works

Most fine particles and colloids in wastewater carry negative surface charges. These charges keep particles separated and stable in water.

PolyDADMAC provides strong positive charges. After dosing, it neutralizes the negative charges on suspended particles and colloids. Once destabilized, the particles can collide and form larger flocs.

In a DAF system, these flocs can attach to air microbubbles and float to the surface for removal. In a sedimentation system, the flocs settle more easily. In a filtration system, the flocs are easier to capture.

This makes PolyDADMAC useful for both DAF pretreatment and conventional coagulation processes.

Recommended Use Method

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

The actual dosage depends on wastewater type, pH, turbidity, suspended solids, oil content, color intensity and treatment target.

Jar testing is strongly recommended before full-scale application.

The dosing point and mixing speed should be carefully controlled. PolyDADMAC should be mixed evenly with wastewater, but excessive shear should be avoided after flocs are formed because strong mixing may break the flocs.

Product Selection Guide

Choose low viscosity grades when easy pumping, fast dilution and low molecular weight performance are needed.

Choose medium viscosity grades for general DAF pretreatment and wastewater coagulation.

Choose high viscosity grades when stronger floc formation, better sludge conditioning or more difficult wastewater conditions are involved.

For DAF systems, product selection should consider the wastewater source, suspended solids level, oil content, floc size, flotation speed and scum quality.

For coagulation processes, product selection should consider turbidity, color, colloid stability, pH and downstream separation method.

Available Liquid PolyDADMAC Grades

BLUWAT supplies Liquid PolyDADMAC in different solid content and viscosity grades.

20% solid content series includes DA 201, DA 202, DA 203, DA 204 and DA 205.

40% solid content series includes DA 401, DA 402, DA 403, DA 404, DA 405, DA 406, DA 407 and DA 408.

45% solid content grade includes DA 451.

50% solid content series includes DA 501, DA 502, DA 503, DA 504, DA 505, DA 506 and DA 507.

Different grades are available from low viscosity to very high viscosity. The suitable grade can be selected according to wastewater condition, DAF design, coagulation process and treatment target.

Packaging

BLUWAT Liquid PolyDADMAC is available in:

• 25L plastic drum
• 200L plastic drum
• 1000L IBC drum

Packaging can be selected according to order quantity, storage condition and dosing system requirements.

Storage

Store the product in original sealed containers in a cool and dry place. Keep away from heat, flame and direct sunlight.

Please refer to the product label, TDS and MSDS for detailed handling, storage and shelf life information.

Why Choose BLUWAT PolyDADMAC

BLUWAT Chemicals is a professional manufacturer of water treatment chemicals with more than 25 years of manufacturing experience.

We supply coagulants and flocculants for DAF, coagulation, wastewater clarification, color removal, sludge dewatering and industrial water treatment applications.

Our product range includes PolyDADMAC, Polyamine, Polyaluminium Chloride, Polyacrylamide, Water Decoloring Agent, Aluminum Chlorohydrate and other water treatment chemicals.

BLUWAT PolyDADMAC offers stable quality, flexible grade selection, factory direct supply, technical support and global supply capability.

Frequently Asked Questions