N2O emissions from full-scale nitrifying biofilters.
A full-scale nitrifying biofilter was continuously monitored during two measurement periods (September 2014; February 2015) during which both gaseous and liquid N2O fluxes were monitored on-line. The results showed diurnal and seasonal variations of N2O emissions. A statistical model was run to determine the main operational parameters governing N2O emissions. Modification of the distribution between the gas phase and the liquid phase was observed related to the effects of temperature and aeration flow on the volumetric mass transfer coefficient (kLa). With similar nitrification performance values, the N2O emission factor was twice as high during the winter campaign. The increase in N2O emissions in winter was correlated to higher effluent nitrite concentrations and suspected increased biofilm thickness.
Irstea, UR HBAN, 1 Rue Pierre-Gilles de Gennes, CS 10030, F-92761 Antony Cedex, France.
Julien
J
Bollon
Irstea, UR HBAN, 1 Rue Pierre-Gilles de Gennes, CS 10030, F-92761 Antony Cedex, France. Electronic address: ahlem.filali@irstea.fr.
Ahlem
A
Filali
Irstea, UR HBAN, 1 Rue Pierre-Gilles de Gennes, CS 10030, F-92761 Antony Cedex, France.
Yannick
Y
Fayolle
SIAAP, Direction du Développement et de la Prospective, 82 avenue Kléber, F-92700 Colombes, France.
Sabrina
S
Guerin
SIAAP, Direction du Développement et de la Prospective, 82 avenue Kléber, F-92700 Colombes, France.
Vincent
V
Rocher
Irstea, UR MALY, 5 rue de la Doua, CS 70077, F-69626 Villeurbanne Cedex, France.
Sylvie
S
Gillot
D018441:Biofilms; D058465:Nitrification; D009609:Nitrous Oxide
D009609:Nitrous Oxide
Biofiltration; Full-scale; Greenhouse-gases; Nitrification; Nitrous oxide; Wastewater treatment