Abstract
Copyright © 2016 by The Geochemical Society of Japan. greater on a per-molecule basis than that of CO2 (IPCC, 2007). Different microbial pathways involved in biological nitrogen removal processes in wastewater treatment plants (WWTPs) can produce N2O as well as more favorable gaseous product, N2 (Colliver and Stephenson, 2000; Kimochi et al., 1998). During nitrification, N2O is produced from hydroxylamine (NH2OH) as a byproduct of ammonium (NH4 +) oxidation to nitrite (NO2 –) by ammonia oxidizing bacteria. The concentration of dissolved oxygen (DO) should be maintained at an appropriate level because nitrifying bacteria require oxygen as an electron acceptor. During denitrification, N2O is produced as an intermediate during nitrate (NO3 –) reduction to dinitrogen (N2) by heterotrophic denitrifying bacteria in the absence of oxygen. Organics are used as electron donors in denitrification. Therefore, a sufficient amount of carbon Isotopocule characterization of N2O dynamics during simulated wastewater treatment under oxic and anoxic conditions
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