Which type of aerator causes aeration to occur in splash areas and can help oxidize iron?

• A. Cascade aerator
• B. Draft aerator
• C. Bubble aerator
• D. Surface aerator

Answer: (A)

The cascade aerator is designed to create a series of splash areas where water falls over steps or baffles, allowing for increased air exposure. This process facilitates the transfer of oxygen from the air into the water, which is essential for oxidizing iron and other impurities. As the water splashes and breaks into smaller droplets, it enhances the surface area in contact with air, thereby improving aeration efficiency.

In addition to oxidizing iron, this type of aeration can also help in removing volatile organic compounds (VOCs) and other gases from the water due to the increased interaction with the atmosphere. The physical movement and dispersion of water in the cascade aerator make it particularly effective for treatment processes that require significant gas exchange.

Cascade aerators are commonly used in facilities where iron oxidation is necessary to reduce levels of dissolved iron or manganese, making it a suitable choice for water treatment operations facing these specific challenges.