Data underlying the publication: Oxygen-to-Ammonium-Nitrogen Ratio as an Indicator for Oxygen Supply Management in Microoxic Bioanodic Ammonium Oxidation

<strong></strong>In this study, we systematically investigated NH₄⁺ oxidation at the bioanode with different O₂ and NH₄⁺-Nratios (O₂/NH₄⁺-N) of 0.5, 1.0 and 1.5. Our specific focus was on achieving high NH₄⁺ oxidation while simultaneously maintaining the selectivity of NH₄⁺ oxidation to N₂. Additionally, the diversity of N-related functional bacteria was characterized to elucidate the underlying N conversion reactions in the MEC systems. This study elucidates the influence of microoxic levels of O2 on NH4+ oxidation at bioanodes and providing insights for process optimization.