PolyDADMAC Coagulant for Dyeing Wastewater Color Removal and COD Reduction
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Product Overview
Bluwat BLU DA Series PolyDADMAC is a liquid cationic coagulant based on Poly(dimethyldiallylammonium chloride), also known as PolyDADMAC or PDADMAC. It is designed for water treatment, wastewater treatment, textile applications, color removal, sludge dewatering and industrial effluent clarification.
Dyeing wastewater usually contains strong color, residual dyes, auxiliaries, surfactants, fine suspended solids and colloidal organic matter. These pollutants may remain stable in water and can cause high color, high turbidity and part of the COD load. In many dyeing wastewater treatment plants, biological treatment alone may not remove color effectively, while unstable coagulation may lead to poor clarification and excessive chemical consumption.
PolyDADMAC works as an organic cationic coagulant. Its high positive charge density helps neutralize negatively charged dye molecules, colloidal particles and organic impurities. After charge neutralization, these contaminants can aggregate into larger flocs and become easier to separate through sedimentation, dissolved air flotation or filtration.
For dyeing wastewater treatment, PolyDADMAC can be used alone or together with Polyaluminium Chloride and Polyacrylamide. It is suitable for chemical pretreatment before biological treatment, color removal before discharge and effluent clarification before reuse.
Product Name
PolyDADMAC Coagulant for Dyeing Wastewater Color Removal and COD Reduction
Chemical Name
Poly(dimethyldiallylammonium chloride)
CAS Number
26062-79-3
Common Names
PolyDADMAC
PDADMAC
Polydadmac
PolyDMDAAC
Cationic Coagulant
Organic Coagulant
Cationic Polymer
Dyeing Wastewater Color Removal Chemical
Product Type
Liquid cationic polymer
Organic coagulant
Color removal coagulant
Textile wastewater pretreatment chemical
Coagulation aid for COD reduction
Industrial effluent clarification polymer
Why PolyDADMAC Is Used for Dyeing Wastewater
Dyeing wastewater can be difficult to treat because color bodies and fine organic particles often remain dispersed in water. Many dyes and colloidal impurities carry negative charges. Without enough charge neutralization, the particles do not combine into strong flocs, and the treated water may still look dark or cloudy.
PolyDADMAC provides strong cationic charge neutralization. It helps destabilize dye particles and colloidal organics, allowing them to form larger flocs. This improves color removal, turbidity reduction and solid liquid separation.
In a dyeing wastewater treatment system, PolyDADMAC is especially useful when:
Wastewater color is strong and difficult to remove
Flocs are small, loose or slow settling
Effluent remains cloudy after PAC treatment
COD contains removable colloidal or suspended organic matter
The treatment plant needs more stable pretreatment before biological treatment
The system requires better clarification before discharge or reuse
How PolyDADMAC Supports COD Reduction
COD in dyeing wastewater may come from dissolved organics, dye residues, auxiliaries, surfactants, suspended solids and colloidal organic matter. PolyDADMAC mainly helps reduce the part of COD that is related to color bodies, suspended impurities and coagulated colloidal organics.
By neutralizing charges and improving floc formation, PolyDADMAC helps remove these pollutants from water through sedimentation, flotation or filtration. This can support COD reduction in the chemical treatment stage and reduce the load entering the biological system.
For highly soluble organic COD, biological treatment or advanced oxidation may still be required. Therefore, PolyDADMAC should be selected and dosed based on jar testing and actual wastewater analysis.
Key Benefits
High cationic charge density for strong charge neutralization
Effective support for dyeing wastewater color removal
Helps remove suspended solids and colloidal organic matter
Can support COD reduction in chemical pretreatment
Improves floc formation and solid liquid separation
Liquid form for easy dilution, dosing and continuous operation
Can be used alone or together with PAC and PAM
Suitable for sedimentation, DAF and clarification systems
Helps improve wastewater pretreatment before biological process
Supports sludge dewatering and treatment stability
Available in different solid content and viscosity grades
Manufacturer supply with TDS, MSDS, COA and sample support
Technical Specifications
| Item | Specification |
|---|---|
| Product Series | BLU DA Series PolyDADMAC Liquid |
| Appearance | Colorless to light yellow liquid |
| Chemical Name | Poly(dimethyldiallylammonium chloride) |
| Common Name | PolyDADMAC, PDADMAC, Polydadmac |
| CAS Number | 26062-79-3 |
| Product Type | Liquid cationic polymer |
| Solid Content | 20–50% |
| pH Value | 3.0–7.0 |
| Specific Gravity at 25°C | 1.01–1.10 |
| Molecular Weight | Low, medium, high and very high grades available |
| Brookfield Viscosity at 25°C | Below 200 cps to above 15000 cps depending on grade |
| Solubility | Soluble in water |
| Main Application | Dyeing wastewater color removal, COD reduction support, coagulation and clarification |
Available Grades
| Grade | Solid Content | Molecular Weight | Brookfield Viscosity at 25°C |
|---|---|---|---|
| DA 201 | 19.0–21.0% | Low | Below 200 cps |
| DA 202 | 19.0–21.0% | Medium | 200–700 cps |
| DA 203 | 19.0–21.0% | Medium | 700–1000 cps |
| DA 204 | 19.0–21.0% | High | 1000–2000 cps |
| DA 205 | 19.0–21.0% | Very High | 2000–3000 cps |
| DA 401 | 39.0–41.0% | Low | Below 500 cps |
| DA 402 | 39.0–41.0% | Medium | 500–1000 cps |
| DA 403 | 39.0–41.0% | Medium | 1000–3000 cps |
| DA 404 | 39.0–41.0% | High | 3000–5000 cps |
| DA 405 | 39.0–41.0% | High | 5000–8000 cps |
| DA 406 | 39.0–41.0% | Very High | 8000–12000 cps |
| DA 407 | 39.0–41.0% | Very High | 12000–15000 cps |
| DA 408 | 39.0–41.0% | Very High | Above 15000 cps |
| DA 451 | 44.0–46.0% | High | 8000–12000 cps |
| DA 501 | 49.0–51.0% | Low Medium | 1000–2000 cps |
| DA 502 | 49.0–51.0% | Medium | 2000–3000 cps |
| DA 503 | 49.0–51.0% | High | 3000–5000 cps |
| DA 504 | 49.0–51.0% | High | 5000–8000 cps |
| DA 505 | 49.0–51.0% | Very High | 8000–12000 cps |
| DA 506 | 49.0–51.0% | Very High | 12000–15000 cps |
| DA 507 | 49.0–51.0% | Very High | Above 15000 cps |
Recommended Treatment Process
The final dosing process should be confirmed by laboratory jar test because dyeing wastewater varies by dye type, fabric type, production process, pH, salinity, COD and color concentration.
A typical chemical treatment process may include:
- Collect representative dyeing wastewater sample from the equalization tank
- Test pH, color, turbidity, COD and suspended solids
- Dilute PolyDADMAC to the recommended working concentration
- Add PolyDADMAC and mix rapidly for charge neutralization
- Add PAC if stronger coagulation and further color removal are required
- Adjust pH to the suitable range according to jar test results
- Add diluted PAM solution to enlarge and strengthen flocs
- Separate flocs by sedimentation, DAF or filtration
- Check treated water color, COD, turbidity and sludge condition
For continuous operation, the dosing point, mixing intensity and chemical sequence should be optimized to prevent poor dispersion or floc breakage.
Use with PAC and PAM
PolyDADMAC can be used alone or in combination with inorganic coagulants such as Polyaluminium Chloride. For dyeing wastewater with high color and COD, a combined treatment program often gives better overall performance.
PolyDADMAC helps neutralize negative charges and destabilize dye particles.
PAC improves coagulation, color reduction and suspended solids removal.
PAM helps create larger flocs for faster settling, flotation and sludge separation.
This combination can improve color removal, reduce cloudy effluent and support COD reduction where COD is associated with removable suspended or colloidal pollutants.
Dilution and Dosage
When PolyDADMAC is used alone, it is recommended to dilute it to 0.5–5% concentration based on solid content before dosing.
The actual dosage depends on wastewater color, COD, turbidity, dye type, pH, suspended solids and discharge target. Jar test is recommended to find the most economical dosage and best chemical sequence.
The chemical should be mixed evenly with wastewater during the charge neutralization stage. After flocs are formed, excessive mixing should be avoided because strong shear may break the flocs and reduce settling performance.
Suitable Treatment Units
Equalization tank pretreatment
Coagulation tank
Flocculation tank
Sedimentation tank
Dissolved air flotation system
Chemical clarification system
Sludge thickening system
Sludge dewatering system
Final polishing before discharge or reuse
Application Fields
Dyeing wastewater treatment
Textile printing wastewater treatment
Textile finishing wastewater treatment
Textile effluent treatment plant ETP
Industrial color wastewater treatment
COD reduction pretreatment
Sludge dewatering support
Paper making wastewater treatment
Mining and industrial water clarification
Packaging
25L plastic drum
200L plastic drum
1000L IBC drum
Customized packaging can be discussed according to order quantity and shipping requirements.
Storage
Store in original containers in a cool and dry place. Keep away from heat, flame and direct sunlight. Keep containers tightly closed when not in use. Please refer to the product label, Technical Data Sheet and MSDS for detailed handling, storage and shelf life information.
Why Choose Bluwat
Bluwat is a manufacturer and exporter of water treatment chemicals for textile, dyeing, printing, paper, mining, municipal and industrial wastewater treatment applications. We supply PolyDADMAC, PAC, PAM, Polyamine, Water Decoloring Agent and other coagulants and flocculants for different wastewater systems.
For dyeing wastewater customers, Bluwat can support chemical selection, jar testing, dosage optimization and treatment process recommendations. TDS, MSDS, COA and sample support can be provided for evaluation.
Request a Sample
If your dyeing wastewater has high color, poor floc formation, cloudy effluent or COD reduction pressure, contact Bluwat for PolyDADMAC sample and technical support. Our team can help recommend a suitable grade and chemical combination based on your wastewater condition.