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In this work, a mathematical model including both ammonium oxidizing bacteria (AOB) and heterotrophic bacteria (HB) is constructed to predict N 2 O production from the nitritation systems receiving the real anaerobic digestion liquor. This is for the first time that N 2 O production from such systems was modeled considering both AOB and HB. The model was calibrated and validated using experimental data from both lab- and pilot-scale nitritation reactors. The model predictions matched the dynamic N 2 O, ammonium, nitrite and chemical oxygen demand data well, supporting the capability of the model. Modeling results indicated that HB are the dominant contributor to N 2 O production in the above systems with the dissolved oxygen (DO) concentration of 0.5–1.0 mg O 2 /L, accounting for approximately 75% of N 2 O production. The modeling results also suggested that the contribution of HB to N 2 O production decreased with the increasing DO concentrations, from 75% at DO = 0.5 mg O 2 /L to 25% at DO = 7.0 mg O 2 /L, with a corresponding increase of the AOB contribution (from 25% to 75%). Similar to HB, the total N 2 O production rate also decreased dramatically from 0.65 to 0.25 mg N/L/h when DO concentration increased from 0.5 to 7.0 mg O 2 /L.

Modeling of Nitrous Oxide Production from Nitritation Reactors Treating Real Anaerobic Digestion Liquor