Poly Alumnium Chloride
Poly Aluminium Chloride (PAC)
Poly Aluminium Chloride (PAC) is an inorganic polymer coagulant with the general formula [Al₂(OH)nCl₆−n]m, widely used for water purification, wastewater treatment, and as a coagulant in various industrial processes. Available in both liquid and powder forms, PAC is preferred over traditional coagulants like alum due to its high efficiency, faster sedimentation, and reduced sludge production. It is suitable for a broad pH range and can treat water with high turbidity and varying chemical content.
Product Specifications (Typical Industrial/Drinking Water Grade)
| Parameter | Specification |
|---|---|
| Appearance | Yellow to white powder or liquid |
| Al₂O₃ content | 28% – 32% (typical) |
| Basicity | 50% – 90% (varies with grade) |
| Insoluble matter | ≤ 1.0% |
| pH (1% solution) | 3.5 – 5.0 |
| Iron (Fe) content | ≤ 0.01% |
| Heavy metals (as Pb) | ≤ 0.003% |
| Arsenic (As) | ≤ 0.0002% |
| Sulfate (SO₄²⁻) | ≤ 3.5% |
| Chloride (Cl⁻) | Present, based on basicity |
| Shelf life | 6 – 12 months (dry), 6 months (liquid) |
Forms Available:
- Powder (white, light yellow)
- Liquid (clear pale yellow)
Grades:
- Industrial Grade
- Drinking Water Grade (NSF / ISO certified)
- Food/Pharmaceutical Grade (on request)
Key Features & Properties
- High Coagulation Efficiency – Rapid removal of suspended particles, organic matter, and heavy metals.
- Effective over Wide pH Range – Works between pH 4–10, eliminating the need for pre-acidification.
- Low Sludge Production – Generates less sludge than traditional coagulants, reducing disposal costs.
- Fast Sedimentation – Improves settling time and floc strength.
- Stable Shelf Life – Long-lasting under proper storage conditions.
- Non-toxic and Environmentally Safe – Safe for drinking water use (when using certified grades).
Benefits & Advantages
- Superior Clarification – Produces clear water faster than alum or ferric-based coagulants.
- Cost Savings – Lower dosage required and reduced need for pH adjustment or alkalinity correction.
- Minimal Aluminum Residue – Leaves behind minimal residual aluminum in treated water.
- Flexible Application – Suitable for raw water with varying turbidity and source variability.
- Enhanced Dewatering – Improves sludge thickening and dewatering performance in wastewater treatment.
- User-Friendly – Easy to dose and handle in both liquid and powder forms.
Applications & Use Cases
Drinking Water Treatment
- Coagulation and removal of turbidity, color, and microorganisms.
- Replaces alum with fewer side effects and better residual profiles.
Municipal Wastewater Treatment
- Used to remove phosphorus, organic content (BOD/COD), and suspended solids.
Industrial Effluent Treatment
- Effective in treating effluents from textile, dyeing, paper, tannery, food processing, and chemical plants.
Paper Industry
- Acts as a sizing agent to improve paper quality and increase retention.
Oil and Gas Industry
- Used in sludge dewatering and water recycling processes.
Cosmetic and Pharmaceutical Water
- High-purity PAC used in ultra-clean applications (food/pharma grade).
Swimming Pools and Recreational Water
- Clears cloudy water by removing particulates quickly.
Summary
Poly Aluminium Chloride (PAC) is a next-generation coagulant that outperforms conventional options like alum in both efficiency and environmental safety. Its fast flocculation speed, wide pH tolerance, and reduced sludge generation make it a preferred choice in water and wastewater treatment plants, industrial effluent systems, and even high-purity applications like food and cosmetics. When high performance and compliance are key, PAC delivers a consistent and reliable solution.