Ensuring access to safe and clean drinking water is a global priority. Poly Aluminium Chloride (PAC) plays a crucial role in modern water treatment facilities as a highly effective purifier. Unlike older coagulants, PAC offers superior performance, reduced environmental impact, and enhanced safety for potable water. As a dedicated manufacturer of high-purity PAC, we are proud to contribute to public health and water security.

How Poly Aluminium Chloride Works in Water Purification

PAC is an inorganic polymer coagulant characterized by its complex polymeric structure and high charge density. When added to raw water, it undergoes a series of rapid chemical reactions that lead to the removal of impurities:

• Hydrolysis and Polymerization: Upon dissolution in water, PAC molecules hydrolyze, forming various aluminum hydroxide complexes. These complexes are positively charged and have a high molecular weight.
• Charge Neutralization: The positively charged aluminum species in PAC neutralize the negative surface charges of suspended particles, colloidal matter, and dissolved organic substances present in raw water. This destabilizes the contaminants, preventing them from remaining dispersed.
• Bridging and Sweep Flocculation: The long-chain polymer structure of PAC acts as bridges, linking destabilized particles together. Simultaneously, as PAC further hydrolyzes, it forms aluminum hydroxide precipitates (sweep flocs). These precipitates entrap smaller suspended particles and colloidal matter, forming larger, heavier aggregates known as 'flocs'.
• Sedimentation and Filtration: The formed flocs are easily removed from the water through sedimentation (settling) and subsequent filtration processes. This leaves the water significantly clearer and free from a majority of contaminants, including turbidity, color, and certain microorganisms.

Why PAC is Superior for Drinking Water Treatment

The advantages of using PAC over traditional coagulants like Aluminium Sulphate are significant, particularly for drinking water applications:

• Higher Efficiency at Lower Doses: PAC is generally more effective than Aluminium Sulphate, requiring smaller doses to achieve the same level of purification. This reduces chemical costs and the overall load on the treatment plant.
• Wider pH Range: PAC can effectively coagulate over a broader pH range compared to Aluminium Sulphate, making it more adaptable to varying raw water conditions without extensive pH adjustment.
• Reduced Residual Aluminium: PAC treatment results in significantly lower residual aluminium concentrations in the finished water. This is a critical factor for public health, as excessive aluminium intake is a concern.
• Improved Floc Characteristics: PAC produces denser, stronger flocs that settle more rapidly and are easier to filter. This can lead to improved clarification efficiency and reduced backwashing frequency for filters.
• Less Impact on Alkalinity: PAC has a less detrimental effect on water alkalinity compared to Aluminium Sulphate, often reducing the need for additional alkalinity adjustment chemicals.

Sourcing High-Purity PAC

When purchasing Poly Aluminium Chloride for drinking water treatment, it is imperative to source a high-purity, food-grade, or drinking water grade product. As a leading PAC manufacturer in China, we specialize in producing white powder PAC that meets stringent international standards for potable water. Our commitment to quality assurance ensures that our products are free from harmful contaminants. We advise procurement professionals to always verify product certifications and COAs from their suppliers. Buying PAC from a trusted manufacturer guarantees both efficacy and safety for your water supply.

By understanding the scientific principles and benefits, it becomes clear why Poly Aluminium Chloride is the coagulant of choice for modern drinking water treatment. We invite you to contact us to learn more about our high-quality drinking water grade PAC and how we can support your clean water initiatives.