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<p>Microbial anaerobic ammonium oxidation coupled with iron reduction (Feammox) represents a novel pathway for nitrogen removal. The pivotal role of Feammox in the biogeochemical nitrogen cycle has attracted increasing scientific interest. However, its specific metabolic mechanisms and potential practical applications remain insufficiently elucidated and lack comprehensive interpretation. To advance the understanding of Feammox, research progress in this field is systematically reviewed and synthesized. Additionally, a bibliometric analysis is conducted to identify research hotspots and outline future research directions. Moreover, putative Feammox microorganisms and their associated electron transfer pathways are summarized to elucidate key metabolic mechanisms. The review also examines the influence of abiotic and biotic factors on Feammox activity. Remarkably, potential future applications of Feammoxin in mainstream, sidestream, and tailwater treatment are proposed, with particular emphasis on innovative strategies that sustain iron redox cycling while enhancing the removal of emerging contaminants. Finally, key challenges requiring further investigation are highlighted. This review aims to identify knowledge gaps and ongoing controversies in Feammox research, clarify priority research directions, and provide insights for advancing both mechanistic and engineering applications.</p>

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Novel insights into Feammox for nitrogen removal: research advances, mechanisms, and applications

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Hao Qin,
  • Xingchen Liu,
  • Wenbo Nie,
  • Jun Li,
  • Jinwen Wang,
  • Yi Chen

摘要

Microbial anaerobic ammonium oxidation coupled with iron reduction (Feammox) represents a novel pathway for nitrogen removal. The pivotal role of Feammox in the biogeochemical nitrogen cycle has attracted increasing scientific interest. However, its specific metabolic mechanisms and potential practical applications remain insufficiently elucidated and lack comprehensive interpretation. To advance the understanding of Feammox, research progress in this field is systematically reviewed and synthesized. Additionally, a bibliometric analysis is conducted to identify research hotspots and outline future research directions. Moreover, putative Feammox microorganisms and their associated electron transfer pathways are summarized to elucidate key metabolic mechanisms. The review also examines the influence of abiotic and biotic factors on Feammox activity. Remarkably, potential future applications of Feammoxin in mainstream, sidestream, and tailwater treatment are proposed, with particular emphasis on innovative strategies that sustain iron redox cycling while enhancing the removal of emerging contaminants. Finally, key challenges requiring further investigation are highlighted. This review aims to identify knowledge gaps and ongoing controversies in Feammox research, clarify priority research directions, and provide insights for advancing both mechanistic and engineering applications.