The effectiveness of Polyaluminium Chloride (PAC) in water treatment is rooted in its sophisticated inorganic polymer chemistry. Understanding these chemical principles is key to appreciating its superior performance over traditional coagulants. NINGBO INNO PHARMCHEM CO.,LTD. leverages advanced chemical understanding to produce high-quality PAC that significantly improves water quality. This article explores the chemistry that makes PAC such an indispensable tool.

At its core, Polyaluminium Chloride is a complex inorganic polymer formed by the partial hydrolysis of aluminum chloride. Its general chemical formula, [Al2(OH)nCl6-n]m, indicates a structure consisting of aluminum, hydroxyl groups, and chloride ions linked together in polymeric chains. The specific arrangement and the degree of hydrolysis (represented by 'n') determine the coagulant's properties, such as its charge density and molecular weight.

The primary mechanism by which PAC works is charge neutralization and sweep flocculation. Raw water typically contains suspended particles, colloids, and dissolved organic matter, most of which carry a negative surface charge. These negative charges cause the particles to repel each other, keeping them dispersed and stable in the water.

PAC's polymeric structure, with its multiple positively charged aluminum species, efficiently neutralizes these negative surface charges. This charge neutralization process destabilizes the dispersed particles, allowing them to aggregate. One of the key positively charged species in PAC is the Al13 polymer, which is particularly effective at adsorption and charge neutralization.

Beyond charge neutralization, PAC also facilitates sweep flocculation. As the PAC molecules hydrolyze in water, they form aluminum hydroxide precipitates. These precipitates act as a physical net, trapping dispersed particles and impurities as they form and settle. This dual mechanism ensures a thorough removal of contaminants, leading to clearer and purer water. The efficiency of this process is why understanding the best polyaluminium chloride dosage is crucial – too little, and the neutralization is incomplete; too much, and it can lead to inefficient flocculation or residual aluminum issues.

The benefits derived from this chemistry are numerous:

  • High Charge Density: The polymeric nature of PAC gives it a significantly higher cationic charge density compared to simple aluminum salts like alum. This allows for greater destabilization of impurities with a lower dosage.
  • Reduced pH Impact: While PAC does lower pH, its pre-neutralized nature means the pH drop is generally less pronounced than with alum, simplifying pH management in treatment processes.
  • Formation of Dense Flocs: The strong electrostatic interactions and bridging effects of PAC polymers lead to the formation of larger, denser, and more compact flocs. These flocs settle rapidly, improving the efficiency of sedimentation and reducing the load on downstream filters.
  • Low Residual Aluminum: The optimized structure of PAC often results in lower soluble aluminum residuals in the treated water, a critical factor for drinking water quality and meeting environmental standards.

These chemical properties explain the broad range of polyaluminium chloride applications, from municipal drinking water to industrial wastewater, where its ability to handle diverse contaminant profiles is highly valued. When you choose to buy PAC water treatment solutions from NINGBO INNO PHARMCHEM CO.,LTD., you are accessing a product engineered with a deep understanding of water chemistry.

To ensure the chemical integrity of PAC, proper how to store polyaluminium chloride is vital. Maintaining its recommended storage conditions preserves its polymeric structure and chemical reactivity, guaranteeing its effectiveness in application.

In essence, the advanced chemistry of Polyaluminium Chloride makes it a superior coagulant. NINGBO INNO PHARMCHEM CO.,LTD. is proud to offer PAC products that embody these chemical advantages, contributing to cleaner water and healthier environments.