Nitrous oxide emissions from an intermittent aeration activated sludge system of an urban wastewater treatment plant (original) (raw)
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 emissions exclusively from the aeration tank represented 0.10% of the influent total nitrogen load and the per capita emission factor was almost 3 times higher than that suggested by the IPCC for inventories of N 2 O emission from WWTPs. Figure 1S. The covered aeration tank of the wastewater treatment plant and the openings (A, B and C) through which all measurements were made
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