Why Is Polyferric Sulfate (PFS) More Suitable Than PAC in Certain Water Treatment Scenarios?

1. Introduction

In wastewater treatment processes such as industrial effluent, municipal sewage, and paper mill wastewater, the choice of coagulant plays a key role in both treatment performance and cost efficiency. While Polyaluminum Chloride (PAC) is widely used, Polyferric Sulfate (PFS) often proves to be more suitable in specific water treatment scenarios.

2. Why PFS Is More Suitable Than PAC in Some Situations

Stronger Coagulation Capacity

PFS has a higher molecular weight and stronger charge neutralization ability, making it more effective in coagulating and settling suspended particles—especially in high turbidity and high organic load wastewater.

Wider pH Adaptability

PAC works best in a pH range of 5.5–8.5, while PFS performs well across a broader range of pH 4 to 11, making it ideal for treating acidic or alkaline wastewater.

Better COD Reduction

In industries with high organic pollutants (e.g., food processing, livestock, pharmaceuticals), PFS significantly reduces COD levels in treated water, outperforming PAC.

No Aluminum Residue

For applications like electronic manufacturing or drinking water treatment where aluminum residue is a concern, PFS is a safer and more reliable option.

Faster Sedimentation Rate

The flocs formed by PFS are denser and more compact, allowing for quicker settling and more efficient treatment cycles.

3. Typical Application Scenarios for PFS

4. Conclusion

While PAC is versatile and widely used, PFS offers irreplaceable advantages in specific scenarios involving high organic content, wide pH ranges, aluminum sensitivity, or fast sedimentation needs. Choosing the right coagulant is key to maximizing efficiency and minimizing cost.

5. Our Recommended Product

We supply high-quality industrial and drinking water-grade PFS (powder/liquid) certified by ISO and REACH. Feel free to contact us!

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