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.