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Updated: Jan 17, 2026

Measurement of the Potential Rates of Dissimilatory Nitrate Reduction to Ammonium Based on 14NH4+/15NH4+ Analyses via Sequential Conversion to N2O
Published on: October 7, 2020
Modulación del hierro en la desnitrificación autótrofa mediada por azufre: eficiencia de la desnitrificación,
Yating Chang1, Songkai Qiu2, Gavin Collins3
1Civil Engineering, College of Science and Engineering, University of Galway, Ireland; Ryan Institute, University of Galway, Ireland.
Abstract:
The application of iron sulfide-mediated autotrophic denitrification is promising for nitrate reduction in carbon-deficient wastewater and polluted groundwater. Previous studies have shown distinct functional microbial communities in different iron sulfide-mediated autotrophic denitrification systems, obscuring how iron modulates their composition and activity. In this study, iron-modulated sulfur autotrophic denitrification efficiency, microbial succession, and key pathways were investigated at different iron levels. Results showed that 1 mM Fe2+ enhanced denitrification efficiency (91.1 %) and prevented cell encrustation. Metagenomic analysis indicated that phylum Campylobacterota (16.0 %) and genus Sulfurimonas (14.4 %) were enriched under iron-modulated conditions. Iron modulated nitrate reduction by improving the relative abundance of complete denitrification genes (napA, napB, and nosZ) and stimulating sulfur metabolism through the SOX complex pathway (soxZ and soxY). These findings reveal the role of iron in modulating sulfur-mediated autotrophic denitrification and provide new insights into the microbial mechanisms involved in iron-sulfur coupling systems.
Videos de Conceptos Relacionados
Microbial Nutrition
Metabolism of Chemolithotrophs
Sulfur Assimilation
Carbon-dioxide Fixation
Inorganic Nitrogen Assimilation
Anoxygenic Photosynthesis

