what is the importance of aeration in the process of cleaning of water and what is the definition of aeration

Aeration brings water and air in close contact so that dissolved gases like carbon dioxide can be removed and dissolved metals like iron, hydrogen sulfide, and volatile organic chemicals can be oxidized. Aeration is often the first major process at the treatment plant.

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because it generates aerobic bacteria due to the presence of oxygen and these organisms feed upon it and kill them....
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Aeration- The process of generating oxygen in wastewater to produce aerobic bacteria which feed upon them.
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