What is Polyaluminium Chloride (PAC)?

Polyaluminium Chloride (PAC) is an inorganic polymer coagulant primarily used in water treatment and purification processes. It is available in powder, granular, or liquid form, typically yellow, light yellow, or white depending on purity. PAC is formed by the partial hydrolysis of aluminium chloride, resulting in a product with polymeric Al ions that have strong coagulating power.

PAC works by neutralizing the negative charge on suspended particles in water, causing them to clump together into larger particles (flocs) for easier removal. It offers faster floc formation, broader pH range effectiveness, and produces less sludge compared to traditional alum (aluminium sulphate).

USES AND APPLICATIONS

INDUSTRIES

Polyaluminium Chloride is widely used in:

• Municipal drinking water and sewage treatment plants

• Industrial wastewater treatment (textile, chemical, oil, and mining industries)

• Paper and pulp industry (as a retention and drainage aid)

• Cosmetics and personal care (in regulated applications)

• Dyeing and leather processing (color removal and clarification)

KEY ADVANTAGES

• Higher efficiency than traditional coagulants like alum

• Works in a wider pH range (4–10)

• Produces less sludge and reduces sludge handling costs

• Faster floc formation and better settling

• Lower dosage requirement, making it more cost-effective

• Improves turbidity removal and color reduction