What is the primary use of sodium hypochlorite in water treatment facilities?

Sodium hypochlorite is primarily used for disinfection in water treatment facilities. It is a powerful oxidizing agent and serves as an effective disinfectant by killing bacteria, viruses, and other pathogens present in the water. The process of adding sodium hypochlorite helps to ensure that the treated water is safe for human consumption and meets public health standards.

In addition to its disinfection capabilities, sodium hypochlorite also plays a role in the overall water treatment process by participating in the oxidation of organic matter, which can further improve water quality. Its application is crucial in achieving the necessary microbial control and preventing waterborne diseases.

Other options such as pH adjustment, flocculation aid, and corrosion control are handled by specific chemicals designed for those purposes. For instance, lime is commonly used for pH adjustment, while aluminum sulfate is often used as a flocculant, and various inhibitors may be employed for corrosion control. These functions are distinct from the primary role of sodium hypochlorite, emphasizing its focused use in disinfection.