Industrial wastewater coloration is one of the most visible yet technically challenging pollutants facing manufacturers today. Unlike suspended solids or organic loads that can be addressed with conventional treatment, dissolved colorants — particularly from synthetic dyes, pigments, and printing inks — require specialized chemical intervention. Even at concentrations as low as 1 ppm, certain dyes can impart visible color to receiving waters, triggering regulatory violations and public concern regardless of other compliance parameters.
The science of decolorization centers on charge neutralization and molecular bridging. Most synthetic dyes — reactive, acid, direct, and disperse types — carry a strong negative charge in aqueous solution, forming stable colloidal systems that resist gravity settling and biological degradation. The key to effective treatment lies in cationic polymers with sufficiently high charge density to neutralize these anionic dye molecules, destabilize the colloidal system, and form settleable flocs.
| Dye Type | Charge Characteristic | Treatment Difficulty | CW-05 Effectiveness |
|---|---|---|---|
| Reactive Dyes | Strongly anionic | High — highly soluble | 90-95% removal |
| Acid Dyes | Anionic | Moderate | 88-95% removal |
| Direct Dyes | Anionic, linear | Moderate-High | 85-92% removal |
| Disperse Dyes | Non-ionic | Lower — can coagulate | 80-88% removal |
| Pigments in Ink | Varied surface charge | High — fine particles | 85-93% removal |
Traditional approaches using PAC, ferric chloride, or aluminum sulfate work through metal hydroxide precipitation and sweep flocculation. While effective for turbidity and some organic matter, they generate excessive sludge volumes (often 3-5 times that of organic polymers), require tight pH control, and introduce residual aluminum or iron into treated effluent. More critically, their color removal efficiency for highly soluble dyes rarely exceeds 60-70%, leaving plants in continuous non-compliance.
Developed through nearly four decades of manufacturing expertise (since 1985), Cleanwater CW-05 is a dicyandiamide formaldehyde resin-based cationic polymer designed specifically for industrial color removal. Its unique molecular architecture provides exceptionally high cationic charge density, enabling it to neutralize and flocculate even highly soluble dye molecules that conventional coagulants cannot address.
| Parameter | Specification |
|---|---|
| Appearance | Translucid liquid |
| Solid Content | >50% |
| Specific Gravity (20°C) | 1.1-1.3 |
| pH Value (30% water solution) | 1.5-3.0 |
| Viscosity (25°C, mPa.s) | 5-50 |
| Solubility | Dissolve in water absolutely |
| Packaging | 25kg / 250kg / 1250kg drums |
CW-05 serves critical decolorization functions across the full spectrum of color-intensive industries:
Yixing Cleanwater Chemicals Co., Ltd. is located in Yixing, Jiangsu Province, China, adjacent to Shanghai — the economic, financial, and trade center of China. Our strategic location provides convenient transport connections with customers at home and abroad.
Our products, with strong capacities of decolorization and removal of COD and BOD, are mainly used for wastewater treatment across diverse industries including textile, printing, dyeing, paper-making, mining, and ink. In addition, our flocculant agents also serve as effective retention agents in the production process of paper and pulp.
Guided by our principle of "promptness, action, quality, and credit", we are committed to satisfying the demands of both domestic and international customers through high-quality products, reasonable pricing, prompt delivery, and consummate service.
Every wastewater is unique. Cleanwater's technical team provides complimentary jar testing guidance, dosage optimization, and treatment program design to help manufacturers achieve consistent compliance. Whether upgrading an existing treatment system or designing new capacity, our engineers bring decades of practical field experience to your project. Contact us today for a free sample and discover how CW-05 can transform your wastewater treatment performance.
