An aeration tank is a key component in wastewater treatment systems. It is designed to promote the mixing of wastewater with air, allowing beneficial bacteria to break down organic matter. This process helps reduce pollutants and improve water quality before it is released back into the environment. In an aeration tank, air is typically introduced through diffusers or mechanical aerators. The oxygen supplied supports the growth of microorganisms, which consume the organic materials in the wastewater. This biological treatment is essential for effective sewage treatment and is often part of larger systems like activated sludge processes.