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In environmental engineering, screening and aeration are unit operations that remove large floating matter and add dissolved oxygen to water.
Screens remove large floating matter from raw water, such as debris, fish, vegetation, and garbage. Screens with smaller openings can screen more material. Aeration is the process of bringing water and air into close contact to remove dissolved gases and oxidize dissolved metals.
Aeration can also remove volatile organic chemicals (VOC) in the water. Aeration is also an effective method of bacteria control. It can be used to oxidize soluble iron and manganese to insoluble precipitates. Aeration can also reduce ammonia and hydrogen sulfide.
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