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Seasonality of nitrous oxide emissions at six full-scale wastewater treatment plants.
Sieranen, Milla; Hilander, Helena; Haimi, Henri; Larsson, Timo; Kuokkanen, Anna; Mikola, Anna.
Afiliación
  • Sieranen M; Department of Built Environment, Aalto University, P.O. Box 15200, FI-00076 AALTO, Espoo, Finland E-mail: milla.sieranen@aalto.fi.
  • Hilander H; Solita, Eteläesplanadi 8, FI-00130, Helsinki, Finland.
  • Haimi H; Department of Built Environment, Aalto University, P.O. Box 15200, FI-00076 AALTO, Espoo, Finland; FCG Finnish Consulting Group, P.O. Box 950, FI-00601, Helsinki, Finland.
  • Larsson T; Department of Built Environment, Aalto University, P.O. Box 15200, FI-00076 AALTO, Espoo, Finland.
  • Kuokkanen A; Helsinki Region Environmental Services Authority, P.O. Box 100, FI-00066 HSY, Helsinki, Finland.
  • Mikola A; Department of Built Environment, Aalto University, P.O. Box 15200, FI-00076 AALTO, Espoo, Finland.
Water Sci Technol ; 89(3): 603-612, 2024 Feb.
Article en En | MEDLINE | ID: mdl-38358492
ABSTRACT
Nitrous oxide (N2O) is an ozone-depleting greenhouse gas that contributes significantly to the carbon footprint of a wastewater treatment plant (WWTP). Plant-specific measurement campaigns are required to reliably quantify the emission level that has been found to significantly vary between WWTPs. In this study, the N2O emissions were quantified from five full-scale WWTPs during 4-19-day measurement campaigns conducted under both cold period conditions (water temperature below 12 °C) and warm period conditions (water temperature from 12 to 20 °C). The measurement data were studied alongside long-term monitoring data from a sixth WWTP. The calculated emission factors (EFs) varied from near 0 to 1.8% relative to the influent total nitrogen load. The results confirmed a significant seasonality of N2O emissions as well as a notable variation between WWTPs in the emission level, which a single fixed EF cannot represent. Wastewater temperature was one explanatory factor for the emission seasonality. Both low and high emissions were measured from denitrifying-nitrifying activated sludge (AS) processes, while the emissions from only nitrifying AS processes were consistently high. Nitrite (NO2-) at the end of the aerobic zones of the AS process was linked to the variability in N2O emissions during the cold period.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Gases de Efecto Invernadero / Óxido Nitroso Idioma: En Revista: Water Sci Technol Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido
Texto completo
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Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Gases de Efecto Invernadero / Óxido Nitroso Idioma: En Revista: Water Sci Technol Asunto de la revista: SAUDE AMBIENTAL / TOXICOLOGIA Año: 2024 Tipo del documento: Article Pais de publicación: Reino Unido