Model-based identification and testing of appropriate strategies to minimize NO emissions from biofilm deammonification.

Based on a one-year pilot plant operation of a two-step biofilm nitritation-anammox pilot plant, NO mitigation strategies were identified by applying a newly developed biofilm modeling approach. Due to adapted plant operation, the NO emission could be diminished by 75% (8.8% → 2.

Model assisted identification of NO mitigation strategies for full-scale reject water treatment plants.

In a 3-year research project, a new approach to forecast biological NO formation and emission at high-strength reject water treatment has been developed (ASM3/1_N2O). It was calibrated by extensive batch-tests and finally evaluated by long-term measurement campaigns realized at three wastewater treatment plants (WWTPs) with different process configurations for nitrogen removal of reject water. To enable a model application with common full-scale data, the nitritation-connected supplementary processes that are responsible for NO formation are not depicted in the model.