Aeration is a process in which the air is closely contacting with the water (liquid), by passing air bubbles through the water column, i.e. by direct contact of water and air/ oxygen. Aeration is used to saturate the water with oxygen in order to oxidize, for example, iron, or remove dissolved gases such as carbon dioxide or hydrogen sulfide from water. Aeration is the basis for the process of wastewater treatment in biological wastewater treatment plants (aeration tanks, air filters, biofilters).
