Description
Poly Aluminum Chloride (PAC) – Properties, Applications & Benefits
Manufacturer: Urmia Petrochemical Plant
Poly Aluminum Chloride (PAC) is one of the most widely used coagulants in the water treatment industry. This inorganic polymer, made from aluminum and chlorine compounds, is highly effective in removing suspended solids, heavy metals, and organic matter from water and wastewater. Its superior performance over traditional alum (aluminum sulfate) has led to its growing use in various sectors.
Composition and Types
PAC is available in both liquid and powder forms, commonly in the following concentrations:
Liquid PAC with 9% or 18% aluminum oxide (Al₂O₃)
Powdered PAC with 30% aluminum oxide
The choice of type depends on the intended application, quality standards, and pH requirements. High-purity powdered PAC is often used in more sensitive treatment processes.
Main Applications
Thanks to its strong coagulation properties, PAC is used in a broad range of industries and treatment plants, including:
Drinking water treatment
Municipal and industrial wastewater treatment
Removal of heavy metals and hazardous compounds
Treatment of leachate from landfills
Effluent treatment in paper, textile, dairy, detergent, and power plant industries
PAC is also used in concrete manufacturing for improved consistency, in paper production for higher quality, and in enhancing detergent efficiency.
Benefits of Using PAC
PAC offers several advantages over traditional coagulants like alum:
High performance across a wide pH range
Lower sludge production during coagulation
Reduced need for pH adjustment
Effective in both acidic and alkaline environments
Easy to store, transport, and handle
These features make PAC a preferred choice in modern water and wastewater treatment processes.
Comparison: Poly Aluminum Chloride (PAC) vs. Aluminum Sulfate (Alum)
PAC provides higher coagulation efficiency at lower dosages compared to traditional aluminum sulfate. Additionally, PAC is effective over a wider pH range and produces less sludge, which helps reduce operational costs. On the other hand, aluminum sulfate is a low-cost alternative, but due to its need for pH adjustment and higher sludge production, it has largely been replaced by PAC in modern treatment plants.
Packaging and Storage
PAC is supplied in:
25 kg double-layered bags (powder form)
1000-liter IBC tanks or corrosion-resistant containers (liquid form)
Storage recommendations:
Powder: Store in a dry place away from sunlight and moisture
Liquid: Must be stored in tanks made of PE (polyethylene), PVC (polyvinyl chloride), or FRP (fiberglass) due to its corrosive nature
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