What is the primary purpose of using breakpoint chlorination?

The primary purpose of using breakpoint chlorination is to ensure the effective removal of nitrogen compounds, particularly ammonia, from wastewater. This process involves adding chlorine to wastewater until a point is reached where not only the ammonia is oxidized, but additional chlorine is used to eliminate any remaining organic nitrogen as well.

When breakpoint chlorination is applied, sufficient chlorine dosage is achieved to convert ammonia (NH3) to nitrogen gas (N2), which then escapes into the atmosphere. This is crucial for improving effluent quality before it is discharged or further treated, as high levels of nitrogen compounds can lead to issues such as eutrophication in receiving water bodies.

While killing bacteria in effluent, enhancing flavor in drinking water, and preventing pipe corrosion are relevant to the broader context of water treatment, they do not define the primary goal of breakpoint chlorination specifically, which is focused on effective nitrogen removal.