What does PAC do in water treatment?

Polyaluminum chloride (PAC) plays a crucial role in water treatment processes, serving as an effective coagulant and flocculant. In the realm of water purification, PAC is widely utilized due to its versatility and efficiency in removing impurities from water sources. This chemical compound is a key player in the coagulation and flocculation stages, helping to enhance the overall efficiency of water treatment plants.

Coagulation is the first step in water treatment, where PAC is added to raw water. The positively charged aluminum ions in PAC neutralize the negative charges on suspended particles in the water, causing them to clump together. These coagulated particles form larger and heavier aggregates, making it easier for them to settle out of the water during subsequent processes. The coagulation process is essential for removing colloidal and suspended impurities that may not be easily filtered out.

Flocculation follows coagulation and involves the gentle stirring or mixing of water to encourage the formation of larger flocs from the coagulated particles. PAC aids in this stage by providing additional positive charges, promoting the collision and aggregation of particles to form even larger and denser flocs. These flocs settle more effectively during sedimentation, contributing to clearer water.

One of the notable advantages of PAC in water treatment is its adaptability to a wide range of water quality conditions. It performs well in both acidic and alkaline environments, making it suitable for treating diverse water sources. Additionally, PAC is effective in handling fluctuating water turbidity and can be used in various water treatment applications, including drinking water treatment, industrial water treatment, and wastewater treatment.

PAC plays a pivotal role in water treatment processes, facilitating coagulation and flocculation to remove impurities from water sources. Its adaptability, cost-effectiveness, and environmental benefits make it a valuable tool in the quest for clean and safe water supplies. Understanding the significance of PAC in water treatment underscores its importance in addressing water quality challenges around the world.