PolyDADMAC 50% Liquid Coagulant Aid to Replace Alum in Drinking Water Treatment
Product Overview
PolyDADMAC, also known as PDADMAC or Poly(dimethyldiallylammonium chloride), is a water-soluble cationic polymer widely used in drinking water treatment, wastewater treatment, sludge dewatering, mining, paper-making, textile, oil industry, and industrial clarification applications.
In drinking water treatment plants, alum is commonly used to remove turbidity, colloids, clay, silt, algae, and suspended solids. However, traditional alum treatment may generate more sludge, increase chemical consumption, and require careful pH control.
Bluwat PolyDADMAC 50% Liquid Coagulant Aid provides strong cationic charge neutralization. It helps destabilize negatively charged particles and supports the formation of larger, stronger flocs. In suitable raw water systems, it can be used as a coagulant aid to reduce alum dosage, or as a primary coagulant to replace alum after laboratory testing and plant validation.
Application in Drinking Water Treatment
Bluwat PolyDADMAC 50% Liquid is suitable for drinking water and raw water clarification systems where plants need better coagulation efficiency, lower sludge production, and improved filter performance.
Typical applications include:
Drinking water treatment
Raw water clarification
Surface water treatment
River water purification
Lake and reservoir water treatment
Turbidity removal
Suspended solids reduction
Colloid destabilization
Alum dosage reduction
Alum replacement trial
Coagulant aid for PAC, alum, ACH, or ferric salts
Sedimentation tank performance improvement
Filter load reduction
Municipal water treatment plants
Industrial potable water pretreatment
Why Use PolyDADMAC to Replace or Reduce Alum?
Alum is an effective inorganic coagulant, but many water treatment plants want to improve treatment efficiency and reduce sludge load.
PolyDADMAC can help because it has very strong cationic charge density. Instead of relying mainly on metal hydroxide floc formation, PolyDADMAC directly neutralizes negatively charged suspended particles and colloids. This can improve particle destabilization, strengthen floc formation, and reduce the amount of inorganic coagulant required.
In some suitable systems, PolyDADMAC can reduce or eliminate alum and ferric salts when used as a primary coagulant. The final replacement ratio should always be confirmed by jar testing using actual raw water samples.
Key Benefits
50% High Active Liquid Grade
Bluwat PolyDADMAC 50% liquid grades provide 49.0–51.0% solid content, offering higher active polymer concentration and reduced transportation volume compared with lower solid content grades.
Strong Charge Neutralization
PolyDADMAC provides high cationic charge density to neutralize negatively charged clay, silt, algae, organic colloids, and suspended particles in raw water.
Alum Reduction or Replacement Potential
When used as a primary coagulant or coagulant aid, PolyDADMAC can help reduce the use of alum or ferric salts in suitable water treatment systems after proper testing.
Lower Sludge Generation
Compared with traditional inorganic coagulants, PolyDADMAC may help reduce sludge generation in coagulation and clarification systems, depending on raw water quality and dosage program.
Improved Floc Formation
PolyDADMAC helps form larger and more stable flocs, improving sedimentation performance and reducing fine solids carryover.
Better Filter Performance
Improved clarification can reduce suspended solids entering sand filters, multimedia filters, or membrane pretreatment systems, helping improve filtration stability.
Effective at Low Dosage
Because of its high charge density, PolyDADMAC can achieve strong coagulation support at optimized dosage levels.
Easy Liquid Dosing
Liquid PolyDADMAC can be diluted, pumped, and dosed continuously, making it suitable for automatic chemical dosing systems in water treatment plants.
Working Principle
PolyDADMAC improves drinking water coagulation mainly through charge neutralization.
Treatment mechanism:
- Raw water contains negatively charged clay, silt, algae, organic matter, and colloidal particles.
- PolyDADMAC supplies strong positive charges.
- Particle surface charges are neutralized.
- Destabilized particles collide and aggregate.
- Larger flocs form during slow mixing.
- Flocs settle in clarifiers or are removed by filtration.
- Clarified water has lower turbidity and reduced suspended solids.
When used with alum, PolyDADMAC improves charge neutralization and floc strength. When used as a primary coagulant, it may reduce or replace alum in suitable systems after testing.
Recommended Treatment Process
Product Specifications
Available 50% PolyDADMAC Liquid Grades
DA 501
Solid Content: 49.0–51.0%
Relative Molecular Weight: Low Medium
Brookfield Viscosity: 1000–2000 cps
Recommended Use: Easier dispersion and lower viscosity dosing systems for drinking water clarification and alum reduction trials.
DA 502
Solid Content: 49.0–51.0%
Relative Molecular Weight: Medium
Brookfield Viscosity: 2000–3000 cps
Recommended Use: General raw water clarification, turbidity removal, and coagulant aid applications.
DA 503
Solid Content: 49.0–51.0%
Relative Molecular Weight: High
Brookfield Viscosity: 3000–5000 cps
Recommended Use: Higher turbidity water and systems requiring stronger floc formation.
DA 504
Solid Content: 49.0–51.0%
Relative Molecular Weight: High
Brookfield Viscosity: 5000–8000 cps
Recommended Use: Difficult surface water clarification and stronger floc structure requirements.
DA 505
Solid Content: 49.0–51.0%
Relative Molecular Weight: Very High
Brookfield Viscosity: 8000–12000 cps
Recommended Use: Challenging raw water with fine colloids, algae, or high suspended solids.
DA 506
Solid Content: 49.0–51.0%
Relative Molecular Weight: Very High
Brookfield Viscosity: 12000–15000 cps
Recommended Use: High-strength floc formation and difficult clarification systems.
DA 507
Solid Content: 49.0–51.0%
Relative Molecular Weight: Very High
Brookfield Viscosity: Above 15000 cps
Recommended Use: Very difficult raw water conditions where stronger coagulation and floc structure need to be evaluated.
Application Method
For drinking water treatment, PolyDADMAC 50% Liquid should be selected according to raw water turbidity, suspended solids concentration, organic matter, algae content, water temperature, pH value, existing alum dosage, treatment process, and target clarified water quality.
When used alone, PolyDADMAC is normally diluted to 0.5–5% concentration based on solid content before dosing.
For alum replacement or alum reduction, jar testing should compare:
- Current alum-only dosage
- PolyDADMAC-only dosage
- Alum plus PolyDADMAC combination
- PAC or ACH plus PolyDADMAC combination
Key evaluation points include floc size, settling speed, clarified water turbidity, filter performance, sludge volume, residual control, and total chemical cost.
Product Selection Guidance
For water plants that need easier dosing and better dispersion, DA 501 or DA 502 can be tested first.
For medium to high turbidity raw water, DA 503 or DA 504 may provide stronger floc formation.
For high algae water, difficult colloidal particles, or poor settling conditions, DA 505 to DA 507 can be evaluated through jar testing.
For alum replacement projects, the final grade should be selected based on treatment performance, sludge reduction, finished water quality, chemical compatibility, and cost per treated cubic meter.
Use with Alum or PAC
PolyDADMAC 50% Liquid can be used in three ways:
- As a coagulant aid with alum to improve floc quality and reduce alum dosage
- As a coagulant aid with PAC or ACH to strengthen coagulation performance
- As a primary coagulant to replace alum in suitable water treatment systems
PolyDADMAC mainly provides strong cationic charge neutralization.
Alum, PAC, ACH, and ferric salts mainly provide inorganic coagulation and hydroxide floc formation.
The best dosage and replacement ratio should be confirmed through jar testing and plant trials.
Packaging and Storage
Bluwat PolyDADMAC 50% Liquid is available in:
- 25L plastic drums
- 200L plastic drums
- 1000L IBC drums
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 drinking water regulations for detailed storage and handling information.
Why Choose Bluwat PolyDADMAC 50% Liquid?
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:
50% high active liquid PolyDADMAC grade
High charge density cationic polymer
CAS No. 26062-79-3
Suitable for drinking water clarification
Can help reduce or replace alum after testing
Supports turbidity removal and suspended solids reduction
Multiple 50% viscosity grades available
Easy dilution and continuous dosing
COA, TDS, and MSDS available
Technical support for jar testing and dosage optimization
Stable export supply for water treatment projects
FAQ
Can PolyDADMAC replace alum in drinking water treatment?
In suitable water treatment systems, PolyDADMAC can reduce or replace alum when used as a primary coagulant. The actual replacement ratio should be confirmed by jar testing and plant trials.
Why use PolyDADMAC instead of alum?
PolyDADMAC provides strong charge neutralization, can improve floc formation, and may reduce sludge generation compared with traditional inorganic coagulants, depending on raw water quality and dosing program.
What is the solid content of PolyDADMAC 50% Liquid?
Bluwat PolyDADMAC 50% Liquid has 49.0–51.0% solid content.
What is the CAS number of PolyDADMAC?
The CAS number of PolyDADMAC is 26062-79-3.
Can PolyDADMAC be used with alum?
Yes. PolyDADMAC can be used as a coagulant aid with alum to improve floc formation, settling speed, turbidity removal, and filtration performance.
Can PolyDADMAC be used with PAC?
Yes. PolyDADMAC can also be used with PAC or ACH to improve coagulation efficiency and floc quality.
What dilution concentration is recommended?
When used alone, PolyDADMAC is commonly diluted to 0.5–5% concentration based on solid content before dosing.
Which 50% grade should be selected?
DA 501 to DA 502 can be tested for easier dispersion, DA 503 to DA 504 for stronger clarification performance, and DA 505 to DA 507 for difficult raw water conditions requiring very strong floc formation.
How should dosage be determined?
Dosage should be determined through jar testing and plant trials based on raw water turbidity, pH, organic matter, alum reduction target, floc formation, settling speed, clarified water quality, filtration performance, sludge volume, and total treatment cost.