Cost-Effective Color Removal in Textile Wastewater: The PAC & PAM Strategy

Strict environmental regulations and Zero Liquid Discharge (ZLD) mandates are putting immense pressure on textile mills. For ETP managers, the two biggest headaches remain constant: stubborn color removal and skyrocketing sludge disposal costs.

While advanced filtration is an option, the most cost-effective solution often lies in optimizing the fundamental chemical coagulation process using Polyaluminum Chloride (PAC) and Polyacrylamide (PAM).

Why Switch from Alum to PAC?

For modern reactive dyes, PAC significantly outperforms traditional Aluminum Sulfate (Alum).

• Superior Color Removal: PAC’s high charge density effectively neutralizes dye colloids.
• pH Stability: Unlike Alum, PAC consumes less alkalinity, reducing the need for pH-adjusting chemicals.
• Less Sludge: Using High-Performance PAC can reduce sludge volume by 30-40% compared to Alum, directly cutting disposal fees.

The Golden Rule of Dosing

To achieve clear water without wasting chemicals, the synergy between coagulants and flocculants is vital. The correct sequence is non-negotiable:

1. Adjust pH: Target 6.5–8.0 for optimal reaction.
2. Dose PAC (Coagulation): Rapid mixing to break dye stability and form micro-flocs.
3. Dose PAM (Flocculation): Add Polyacrylamide (PAM) with slow mixing to bind micro-flocs into large, heavy aggregates for rapid settling.

Conclusion

In the competitive textile market, efficient water treatment is a distinct advantage. Tairan Chemical supports the textile industry with industrial-grade PAC and specialized PAM solutions designed specifically for high-color effluent, helping mills achieve compliance at the lowest possible cost.