Emissões de óxido nitroso do tanque de aeração de uma estação de tratamento de esgotos com sistema de lodos ativados convencional

• Main Authors: Renato P. Ribeiro, William Z. de Mello, Renata B. Alvim, Samara A. Andrade, Ariane C. Brotto, Débora C. Kligerman, Jaime L. M. Oliveira, Paulo A. de Almeida
• Format: Article
• Language: English
• Published: Sociedade Brasileira de Química 2013-01-01
• Series: Química Nova
• Subjects: nitrous oxide; wastewater treatment plant; activated sludge
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000700013&lng=en&tlng=en

Nitrous oxide (N2O) emissions were measured monthly from January to June 2010 in the aeration tank of a wastewater treatment plant (WWTP) in Southeast Brazil. Emissions were lower in summer than winter and were positively related with influent ammonium (NH4+) concentration. The average N2O emission was 1.11 kg N day-1 corresponding to 0.02% of the influent total nitrogen load. The average emission factor calculated for the population served was 2.5 lower than that proposed by the Intergovernmental Panel on Climate Change (IPCC) for inventories of N2O emissions from WWTPs with controlled nitrification and denitrification processes.