Which type of aerator is more efficient in removing dissolved gases and oxidizing iron and manganese?

• A. Cascade aerator
• B. Fixed film aerator
• C. Draft aerator
• D. Surface aerator

Answer: (C)

The draft aerator is highly effective in removing dissolved gases and oxidizing iron and manganese due to its design and operational characteristics. This type of aerator utilizes a combination of atmospheric air and a mechanical draft, which promotes efficient gas transfer.

In a draft aerator, water is drawn up through a series of pipes or channels, allowing it to come into contact with the air. This vigorous mixing enhances the surface area of the water, promoting greater oxygen transfer. The increased contact time between the water and air aids in the removal of gases like carbon dioxide and hydrogen sulfide while simultaneously supporting the oxidation of iron and manganese—key processes in ensuring water quality.

This efficiency is particularly important in water treatment applications where the reduction of these contaminants is crucial for aesthetic and safety reasons. Other types of aerators, while useful in different scenarios, may not achieve the same level of efficiency for these specific tasks as the draft aerator does.