Sodium Metabisulfite is primarily used as a:

Sodium Metabisulfite acts primarily as a reducing agent, which means it is involved in the process of donating electrons to other substances. In wastewater treatment, it plays a crucial role, particularly in the dechlorination process, where it reacts with chlorine and chloramines, effectively neutralizing them. This is essential for protecting aquatic life in receiving waters, as chlorine is toxic to fish and other organisms.

The ability of Sodium Metabisulfite to reduce other compounds is vital in various applications within wastewater treatment to ensure the safety of discharged effluents. Its function as a reducing agent makes it a valuable chemical in controlling oxidation-reduction potential, contributing to effective treatment processes. Understanding this role emphasizes the importance of Sodium Metabisulfite in maintaining the quality of wastewater treatment systems.