PAC vs. Alum? What are the key differences to consider?

Polyaluminum chloride (PAC) and aluminum sulfate (alum) are both commonly used as coagulants in water treatment processes, but PAC is generally considered a better option in terms of effectiveness and efficiency. Here are a few reasons why:

1. Enhanced Coagulation Optimization: PAC has a higher charge density and a more balanced charge distribution compared to alum, which results in better coagulation performance and more efficient removal of suspended particles, organic matter, and heavy metals.PAC may reduce TOC without pH reduction or increased production of aluminum sludges.
2. Lower Dosage Requirements: PAC typically requires a lower dosage than alum to achieve the same coagulation performance, which can result in cost savings and reduced environmental impact.
3. Lower Alkalinity Reduction: PAC?is a basic aluminum salt and reacts with the natural alkalinity in water less than alum and has less effect on the water pH, while alum has an acidic effect and has a more significant impact on the water pH. This can be important in applications where the pH needs to be kept within a specific range and results in cost savings for pH adjustment.
4. Lower Aluminum Residual Content: PAC typically requires a lower dosage than alum to achieve the same coagulation performance, resulting in reduced sludge generation and total treatment costs.?Lower finished water aluminum levels can be achieved.
5. Broader Range of Application: PAC has a broader range of application compared to alum, as it can effectively coagulate a wider range of water types and impurities.

USALCO’S Baltimore facility has one of the largest PAC manufacturing operations in the world and is supported by six other PAC facilities around the United States.

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Visit www.usalco.com to learn more.