Polyaluminium Chloride (PAC) is a highly effective coagulant widely used in water treatment. However, not all PAC products are created equal. Understanding the different grades and their specific properties is crucial for selecting the most suitable PAC for your water treatment needs. This guide will help you navigate the choices available and make an informed decision, whether you're looking to buy PAC for municipal or industrial applications.

PAC products are primarily characterized by their Al2O3 content and their basicity. The Al2O3 content refers to the percentage of aluminum oxide in the product, indicating its strength and concentration. Higher Al2O3 content generally means a more potent coagulant. Basicity, on the other hand, relates to the ratio of hydroxyl ions to aluminum ions. It dictates the polymeric structure and charge density of the PAC, influencing its efficiency in neutralizing charged particles in water.

Generally, PAC is categorized based on its basicity and intended application. For instance, lower basicity PAC products (around 40-60%) are often preferred for turbidity removal, yielding larger flocs that settle quickly. These are excellent for general water clarification. Conversely, higher basicity PAC products (around 60-80%) tend to have a higher polymer content and greater charge density, making them more efficient in removing specific contaminants like heavy metals and dissolved organic matter. These are often recommended for more challenging water conditions or specialized industrial wastewater treatment.

When selecting a PAC grade, consider the specific contaminants you need to address, the pH of the water source, and the desired outcomes. For drinking water treatment, high-purity, low-salinity grades are essential to ensure safety and meet regulatory standards. For industrial wastewater, the choice may depend on the nature of the pollutants – for example, textiles might require PAC that efficiently removes dyes, while the oil industry might need PAC that excels in oil-water separation. Consulting with a reputable supplier can help you identify the best PAC product for your specific needs. Purchasing the right PAC ensures optimal performance, cost-effectiveness, and compliance with water quality standards.