Which measure is essential to prevent iron oxidation in water treatment?

The addition of a sequestering agent is essential to prevent iron oxidation in water treatment because sequestering agents bind to iron ions in the water, effectively keeping them in a soluble form. This prevents the iron from reacting with oxygen, which would lead to oxidation and the formation of insoluble iron compounds that can cause discoloration, sedimentation, and potential issues with water quality. By adding sequestering agents, water treatment facilities can minimize issues associated with iron, such as staining and the presence of particulate matter.

This method is particularly beneficial when dealing with waters that have high iron concentrations, as it stabilizes the iron in its dissolved state, making it easier to manage and treat without resulting in unwanted precipitates. It is a proactive measure that ensures better overall water quality and reduces the frequency of cleaning and maintenance required for the treatment system.