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Recebido em 26/1/12; aceito em 13/7/12; publicado na web em 29/11/12 This study investigated the emission of N 2 O during the sequential aerated (60-min) and non-aerated (30-min) stages of an intermittent aeration cycle in an activated sludge wastewater treatment plant (WWTP). N 2 O emission occurred during both stages; however, emission was much higher during aeration. Air stripping is the major factor controlling transfer of N 2 O from the sewage to the atmosphere. The N 2 O emissionsdoi:10.1590/s0100-40422013000100004 fatcat:2ihziii6hngavezrb2zraokbl4