Granular PAC vs. Powdered PAC

Polymeric Aluminum Chloride (PAC) is one of the most widely used coagulants in water treatment, available in both granular (G-PAC) and powdered (P-PAC) forms. Understanding their differences is crucial for selecting the right product for specific applications.

📊 Fact Check:
✔ PAC has a coagulation efficiency 2-3 times higher than traditional aluminum sulfate.
✔ Over 60% of water treatment plants worldwide use PAC for enhanced water purification.

This article explores the key distinctions between granular PAC and powdered PAC, covering aluminum content, production process, applications, storage, and selection criteria.

1. Differences in Aluminum Content

The main coagulation agent in PAC is Al₂O₃ (aluminum oxide content), which determines its effectiveness in removing impurities.

2. Production Process Differences

The manufacturing methods for PAC impact their properties:

🔹 Granular PAC (G-PAC) Production:

• Produced through spray drying or solidification granulation.
• More stable in storage and transportation.

🔹 Powdered PAC (P-PAC) Production:

• Manufactured via fine grinding and spray drying.
• Faster dissolution due to finer particle size.

3. Application Differences

Different industries require different PAC forms:

4. How to Distinguish Between Granular PAC and Powdered PAC?

✅ Particle Size: Granular PAC has a larger particle size (1-5mm), while powdered PAC is fine and smooth (<0.1mm).
✅ Dissolution Time: Powdered PAC dissolves within minutes, whereas granular PAC takes longer.
✅ Storage Appearance: Granular PAC has a uniform bead-like texture, whereas powdered PAC appears as fine dust.

5. How to Store PAC Properly?

Proper storage ensures long-term effectiveness:

📌 Storage Conditions:
✔ Keep in dry, cool areas (humidity <60%) to prevent clumping.
✔ Store in sealed bags to avoid moisture absorption.
✔ Avoid direct sunlight and extreme temperatures.

📌 Shelf Life:
✅ Granular PAC: 2 years (longer stability)
✅ Powdered PAC: 1-1.5 years (absorbs moisture faster)

6. How to Choose the Right PAC for Your Needs?

Consider these factors when selecting PAC:

✔ Application Needs:

• For drinking water treatment → Choose high-purity PAC.
• For industrial wastewater → Choose medium-purity PAC.

✔ Dissolution Speed:

• Need fast-acting coagulation? → Use powdered PAC.
• Prefer gradual coagulation? → Use granular PAC.

✔ Handling & Storage:

• If transportation & storage conditions are unstable, granular PAC is more stable.
• If you need fast dilution, powdered PAC is more efficient.

📊 Market Insight:
Over 75% of industrial users prefer granular PAC due to its longer shelf life and easier handling, while municipal water treatment plants often use powdered PAC for rapid processing.

Conclusion: Choosing the Best PAC for Water Treatment

🔹 Granular PAC is ideal for long-term storage, industrial wastewater, and large-scale water treatment.
🔹 Powdered PAC is preferred for quick-dissolving applications, emergency water treatment, and municipal water supplies.