The selection of an appropriate coagulant is fundamental to effective water treatment. For decades, Aluminum Sulfate (alum) was the standard. However, Polyaluminum Chloride (PAC) has gained significant traction as a superior alternative, offering enhanced performance, better efficiency, and environmental advantages. As a dedicated manufacturer and supplier of both types of coagulants, we can highlight the key differences to help you make an informed choice.

Understanding Coagulants in Water Treatment

Coagulants are chemicals used to destabilize and aggregate suspended or colloidal particles in water. These particles, often carrying negative charges, cause turbidity, color, and can harbor microorganisms. Coagulants introduce positively charged ions that neutralize these charges, allowing particles to clump together (flocculation) and settle out of the water.

Polyaluminum Chloride (PAC): The Modern Solution

PAC is an inorganic polymer with a complex polynuclear structure. Its advantages stem from its high charge density and the formation of larger, more stable flocs.

Aluminum Sulfate (Alum): The Traditional Coagulant

Aluminum Sulfate is a well-established coagulant, a simple salt that works by releasing aluminum ions into the water. While effective, it has several limitations compared to PAC.

Key Comparison: PAC vs. Aluminum Sulfate

  • Efficiency: PAC generally exhibits higher coagulation efficiency. It requires lower dosages to achieve the same or better level of turbidity removal compared to alum. This means less chemical is consumed, reducing operational costs.
  • Floc Formation: PAC forms larger, denser, and faster-settling flocs than alum. This improved settling rate leads to clearer supernatant water and reduces the burden on downstream filtration processes.
  • Sludge Production: PAC typically produces significantly less sludge than alum. Furthermore, the sludge produced by PAC is often denser and easier to dewater, leading to lower sludge disposal costs.
  • pH Impact: PAC has a less pronounced effect on water pH compared to alum. Alum can significantly lower the pH of treated water, often necessitating the addition of alkaline chemicals (like soda ash or lime) to adjust the pH, adding another layer of cost and complexity. PAC generally requires less or no pH adjustment.
  • Performance at Low Temperatures: PAC often maintains better performance in cold water conditions where alum's effectiveness can diminish.
  • Residual Aluminum: While both can leave aluminum residuals, PAC formulations are often designed to minimize residual aluminum content in the treated water, which is a key concern for drinking water safety.
  • Ease of Handling: Both are available in powder and liquid forms. However, PAC's higher efficiency and less impactful pH changes can simplify handling and application processes.

When to Consider PAC from a Trusted Supplier

If your facility requires high-efficiency water treatment, is looking to reduce chemical consumption and sludge disposal costs, or needs a coagulant that performs well across a range of conditions, PAC is likely the superior choice. As a leading Polyaluminum Chloride supplier from China, we offer high-quality PAC that can help you achieve:

  • Optimized water clarity
  • Reduced operational expenses
  • Improved environmental compliance
  • Simplified water treatment processes

When you choose to buy Polyaluminum Chloride from us, you are investing in a modern, effective, and economical solution for your water treatment needs. We provide comprehensive technical support to ensure you select the right grade and dosage for maximum benefit. Compare the performance and cost-effectiveness of PAC yourself – contact us for samples and quotes today.