Bluwat PolyDADMAC for Anaerobic Digested Sludge Dewatering Aid
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Product Overview
PolyDADMAC, also known as PDADMAC or Poly(dimethyl diallyl ammonium chloride), is a liquid cationic polymer with strong charge neutralization performance. It is widely used in wastewater treatment, sludge dewatering, industrial clarification, mining, paper-making, textile, and oil industry applications.
Anaerobic digested sludge is commonly generated in municipal wastewater treatment plants, food wastewater treatment plants, biogas projects, and industrial anaerobic treatment systems. After digestion, sludge structure may become weaker and more difficult to dewater due to fine suspended solids, dissolved organic matter, biological residues, colloids, and high water retention.
Bluwat PolyDADMAC helps neutralize negatively charged sludge particles and colloids. It improves sludge particle aggregation, strengthens floc structure, and supports better water separation during mechanical dewatering. It can be used alone or together with PAM when stronger polymer bridging and higher sludge cake dryness are required.
Application in Anaerobic Digested Sludge Dewatering
Anaerobic digestion reduces organic matter and stabilizes sludge, but the digested sludge still needs efficient thickening and dewatering before disposal, composting, incineration, or further handling.
Bluwat PolyDADMAC can be used in:
- Anaerobic digested sludge dewatering
- Municipal digested sludge conditioning
- Food industry anaerobic sludge treatment
- Biogas plant sludge dewatering
- Waste activated sludge after anaerobic digestion
- Mixed sludge thickening and conditioning
- Centrifuge sludge dewatering
- Belt filter press sludge conditioning
- Screw press and chamber filter press pretreatment
- Filtrate or centrate clarity improvement
- Sludge volume reduction before disposal
Key Benefits
Anaerobic digested sludge often contains fine colloidal particles and negatively charged biological solids. PolyDADMAC provides strong cationic charge to destabilize these particles.
By improving particle aggregation and floc structure, PolyDADMAC helps water separate more easily from digested sludge during mechanical dewatering.
Proper conditioning helps reduce fine solids carryover in centrate or filtrate, lowering the return load to the wastewater treatment system.
Improved solid-liquid separation can reduce the amount of water retained in sludge, helping lower sludge handling and disposal volume.
Suitable for centrifuges, belt filter presses, screw presses, chamber filter presses, and other sludge dewatering systems.
Bluwat provides 20%, 40%, 45%, and 50% liquid PolyDADMAC grades with different viscosity and molecular weight options.
Working Principle
PolyDADMAC improves anaerobic digested sludge dewatering mainly through charge neutralization and floc conditioning.
- Anaerobic digested sludge contains fine biological solids, colloids, organic residues, and suspended particles.
- These particles usually carry negative surface charges and hold water within the sludge structure.
- PolyDADMAC provides strong positive charge to neutralize particle surfaces.
- Destabilized particles aggregate into larger sludge flocs.
- Water separates more easily from the conditioned sludge.
- Mechanical dewatering produces clearer filtrate or centrate and more manageable sludge cake.
Recommended Treatment Process
Product Specifications
| Product Name | BLU DA Series PolyDADMAC Liquid |
| Chemical Name | Poly(dimethyl diallylammonium chloride) |
| CAS Number | 26062-79-3 |
| Appearance | Colorless to light yellow liquid |
| Solid Content | 20–50% |
| pH Value | 3.0–7.0 |
| Specific Gravity | 1.01–1.10 (at 25°C) |
| Charge Type | Cationic |
| Viscosity | Below 200 cps to above 15000 cps (grade dependent) |
| Package | 25L, 200L plastic drum, or 1000L IBC drum |
Available PolyDADMAC Liquid Grades
DA 20% Series
DA 40% Series
DA 50% Series
Application Method & Guidance
PolyDADMAC should be selected according to sludge source, digestion process, concentration, and equipment. When used alone, it is normally diluted to 0.5–5% concentration before dosing.
For centrifuge systems, grade selection focuses on floc strength and shear resistance. For filter presses, the focus is on drainage speed and cake release.
Use with PAM
PolyDADMAC and PAM can be used together for difficult digested sludge. PolyDADMAC provides charge neutralization, while PAM provides polymer bridging and floc enlargement. Common practice: dose PolyDADMAC first, followed by PAM.
Why Choose Bluwat PolyDADMAC?
- High charge density cationic polymer
- 20–50% liquid grades available
- Multiple viscosity options
- Technical support for jar testing
- Stable export supply
- Improves filtrate/centrate clarity
- Easy liquid dilution & dosing
- COA, TDS, and MSDS available
- Supports sludge volume reduction
- Cost-effective operating solutions
FAQ
Yes. It improves sludge conditioning, water release, and solid-liquid separation.
It neutralizes negatively charged particles to form larger flocs, enhancing water separation in centrifuges and presses.
Yes. PolyDADMAC is often used as a coagulant before PAM (flocculant) for superior results.
Dosage should be determined through jar testing and plant trials based on sludge concentration and digestion conditions.
Packaging and Storage
Available in 25L, 200L plastic drums, or 1000L IBC drums. Store in original containers in a cool, dry place away from heat and direct sunlight.