The selection of the right coagulant is critical for effective water treatment. For decades, Aluminum Sulfate (Alum) has been a mainstay, but Poly Aluminium Chloride (PAC) has increasingly become the preferred alternative in many applications. NINGBO INNO PHARMCHEM CO.,LTD. provides a comparative analysis of these two vital water treatment chemicals.

Alum, chemically known as aluminum sulfate, is a traditional inorganic coagulant. It functions by neutralizing the negative charges on suspended particles, causing them to aggregate into flocs that can be removed. However, alum has certain limitations. It is most effective within a relatively narrow pH range (typically 6.5-8.0) and tends to significantly lower the pH of treated water, often necessitating the use of additional alkalis like lime or soda ash to stabilize it. This process increases chemical consumption and operational complexity.

Poly Aluminium Chloride, on the other hand, is a pre-hydrolyzed inorganic polymer coagulant. It offers several distinct advantages over alum. One of the most significant is its broader effective pH range, typically performing well between pH 5 and 9. This wide applicability simplifies treatment operations and reduces the need for pH adjustments. Moreover, PAC typically causes a much smaller drop in pH compared to alum, often requiring minimal or no alkali addition.

In terms of performance, PAC generally forms larger, denser, and faster-settling flocs than alum. This leads to improved clarification and higher efficiency in removing turbidity and other contaminants. The higher polymeric content and charge density of PAC contribute to its superior flocculation capabilities. This enhanced performance can also translate into lower chemical dosages required to achieve the desired water quality.

Another key difference lies in sludge production. PAC typically produces less sludge by volume and weight compared to alum for an equivalent treatment effect. This is a significant advantage, as sludge disposal can be a costly and environmentally challenging aspect of water treatment. Reduced sludge means lower handling and disposal costs.

When it comes to residual aluminum levels in treated water, PAC generally results in lower concentrations than alum. This is a critical factor, as regulatory standards for residual aluminum in drinking water are becoming increasingly stringent. PAC's ability to leave less aluminum in the treated water enhances its appeal for potable water applications.

While alum might sometimes be more cost-effective on a per-kilogram basis, the overall cost-effectiveness of PAC is often superior when considering lower dosage rates, reduced chemical consumption for pH adjustment, and lower sludge disposal costs. Understanding these differences is key to making an informed decision about which coagulant best suits specific treatment needs.

NINGBO INNO PHARMCHEM CO.,LTD. provides both high-quality PAC and other water treatment chemicals, enabling clients to choose the optimal solution for their unique requirements. Whether you are considering the advantages of PAC over alum or need specific Poly Aluminium Chloride for drinking water applications, we offer the expertise and products to meet your demands.

In conclusion, while alum has served the water treatment industry well, PAC offers significant performance and economic advantages, making it a modern and often superior choice. NINGBO INNO PHARMCHEM CO.,LTD. is committed to supporting water treatment professionals with advanced chemical solutions like PAC, ensuring cleaner and safer water for all.