Data underlying the publication: Toward Nitrous Oxide-Free Ammonium Treatment: Integrating Hydrogenotrophic Denitrification in Anoxic Bioanodes
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Microbial electrolysis cells (MECs) offer a novel alternative to conventional biological ammonium (NH<sub>4</sub><sup>+</sup>) removal by using electrodes, rather than oxygen, as electron acceptors. However, NH<sub>4</sub><sup>+</sup> oxidation at bioanodes can result in substantial nitrous oxide (N<sub>2</sub>O) emissions—a potent greenhouse gas with significant climate impact. We investigated the potential of hydrogenotrophic denitrification within the anodic compartment to mitigate N<sub>2</sub>O emissions during NH<sub>4</sub><sup>+</sup> removal. In situ hydrogen (H<sub>2</sub>) addition effectively reduced N<sub>2</sub>O concentrations to below 0.01 mg-N/L, without nitrate or nitrite accumulation. Batch experiments demonstrated that the suspended biomass, exhibited a high capacity for N<sub>2</sub>O reduction, which was strongly dependent on H<sub>2</sub> availability and linked to denitrification activities. Integrating hydrogenotrophic denitrification with NH<sub>4</sub><sup>+</sup> oxidation in MECs presents a promising approach for sustainable nitrogen management with near-zero N<sub>2</sub>O emission.
