Intra/extracellular electron transfer and metagenomic analysis elucidated the roles of magnetic iron powder (FeO) on mixotrophic denitrification system.

Elemental iron provides a viable strategy to improve the denitrification efficiency by expediting electron transport. However, the roles of magnetic iron powder (FeO) on mixotrophic denitrification remains unknown. In this study, the intra/extracellular electron transfer (IET/EET) and microbial metabolism mechanisms were explored in a FeO-mediated sulfide-autotrophic and heterotrophic denitrification system.